8 changed files with 862 additions and 910 deletions
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2Cargo.toml
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54src/cache.rs
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484src/hash.rs
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61src/hash/ahash.rs
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62src/hash/dhash.rs
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197src/hash/mod.rs
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219src/hash/phash.rs
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693src/lib.rs
@ -1,484 +0,0 @@ |
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// Copyright 2015 Drew Short <drew@sothr.com>.
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//
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// Licensed under the MIT license<LICENSE-MIT or http://opensource.org/licenses/MIT>.
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// This file may not be copied, modified, or distributed except according to those terms.
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use std::path::Path;
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use std::f64;
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use super::image;
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use super::image::{GenericImage, Pixel, FilterType};
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use super::dft;
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use super::dft::Transform;
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use cache::Cache;
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// Used to get ranges for the precision of rounding floats
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// Can round to 1 significant factor of precision
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const FLOAT_PRECISION_MAX_1: f64 = f64::MAX / 10_f64;
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const FLOAT_PRECISION_MIN_1: f64 = f64::MIN / 10_f64;
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// Can round to 2 significant factors of precision
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const FLOAT_PRECISION_MAX_2: f64 = f64::MAX / 100_f64;
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const FLOAT_PRECISION_MIN_2: f64 = f64::MIN / 100_f64;
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// Can round to 3 significant factors of precision
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const FLOAT_PRECISION_MAX_3: f64 = f64::MAX / 1000_f64;
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const FLOAT_PRECISION_MIN_3: f64 = f64::MIN / 1000_f64;
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// Can round to 4 significant factors of precision
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const FLOAT_PRECISION_MAX_4: f64 = f64::MAX / 10000_f64;
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const FLOAT_PRECISION_MIN_4: f64 = f64::MIN / 10000_f64;
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// Can round to 5 significant factors of precision
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const FLOAT_PRECISION_MAX_5: f64 = f64::MAX / 100000_f64;
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const FLOAT_PRECISION_MIN_5: f64 = f64::MIN / 100000_f64;
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/**
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* Prepared image that can be used to generate hashes
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*/
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pub struct PreparedImage<'a> {
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orig_path: &'a str,
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image: image::ImageBuffer<image::Luma<u8>, Vec<u8>>,
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cache: &'a Cache<'a>,
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}
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/**
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* Wraps the various perceptual hashes
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*/
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pub struct PerceptualHashes<'a> {
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pub orig_path: &'a str,
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pub ahash: u64,
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pub dhash: u64,
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pub phash: u64,
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}
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/**
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* All the supported precision types
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*
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* Low aims for 32 bit precision
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* Medium aims for 64 bit precision
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* High aims for 128 bit precision
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*/
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#[allow(dead_code)]
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pub enum Precision {
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Low,
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Medium,
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High,
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}
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// Get the size of the required image
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//
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impl Precision {
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fn get_size(&self) -> u32 {
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match *self {
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Precision::Low => 4,
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Precision::Medium => 8,
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Precision::High => 16,
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}
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}
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}
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/**
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* Types of hashes supported
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*/
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pub enum HashType {
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Ahash,
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Dhash,
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Phash,
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}
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/**
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* Resonsible for parsing a path, converting an image and package it to be
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* hashed.
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*
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* # Arguments
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*
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* * 'path' - The path to the image requested to be hashed
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* * 'size' - The size that the image should be resize to, in the form of size x size
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*
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* # Returns
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*
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* A PreparedImage struct with the required information for performing hashing
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*
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*/
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pub fn prepare_image<'a>(path: &'a Path,
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hash_type: &HashType,
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precision: &Precision,
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cache: &'a Cache<'a>)
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-> PreparedImage<'a> {
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let image_path = path.to_str().unwrap();
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let size: u32 = match *hash_type {
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HashType::Phash => precision.get_size() * 4,
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_ => precision.get_size(),
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};
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// Check if we have the already converted image in a cache and use that if possible.
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match cache.get_image_from_cache(&path, size) {
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Some(image) => {
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PreparedImage {
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orig_path: &*image_path,
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image: image,
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cache: &cache
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}
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}
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None => {
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// Otherwise let's do that work now and store it.
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let image = image::open(path).unwrap();
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let small_image = image.resize_exact(size, size, FilterType::Lanczos3);
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let grey_image = small_image.to_luma();
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match cache.put_image_in_cache(&path, size, &grey_image) {
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Ok(_) => {}
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Err(e) => println!("Unable to store image in cache. {}", e),
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};
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PreparedImage {
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orig_path: &*image_path,
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image: grey_image,
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cache: &cache,
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}
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}
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}
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}
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/**
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* Get all perceptual hashes for an image
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*/
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pub fn get_perceptual_hashes<'a>(path: &'a Path, precision: &Precision, cache: &Cache) -> PerceptualHashes<'a> {
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let image_path = path.to_str().unwrap();
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let ahash = AHash::new(&path, &precision, &cache).get_hash();
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let dhash = DHash::new(&path, &precision, &cache).get_hash();
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let phash = PHash::new(&path, &precision, &cache).get_hash();
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PerceptualHashes {
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orig_path: &*image_path,
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ahash: ahash,
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dhash: dhash,
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phash: phash,
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}
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}
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/**
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* Calculate the number of bits different between two hashes
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* Add to the PerceptualHashTrait
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*/
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pub fn calculate_hamming_distance(hash1: u64, hash2: u64) -> u64 {
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// The binary xor of the two hashes should give us a number representing
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// the differences between the two hashes. All that's left is to count
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// the number of 1's in the difference to determine the hamming distance
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let bin_diff = hash1 ^ hash2;
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let bin_diff_str = format!("{:b}", bin_diff);
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let mut hamming = 0u64;
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for bit in bin_diff_str.chars() {
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match bit {
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'1' => hamming += 1,
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_ => continue,
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}
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}
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hamming
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}
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pub trait PerceptualHash {
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fn get_hash(&self) -> u64;
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}
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pub struct AHash<'a> {
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prepared_image: Box<PreparedImage<'a>>,
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}
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impl<'a> AHash<'a> {
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pub fn new(path: &'a Path, precision: &Precision, cache: &'a Cache) -> Self {
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AHash { prepared_image: Box::new(prepare_image(&path, &HashType::Ahash, &precision, &cache)) }
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}
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}
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impl<'a> PerceptualHash for AHash<'a> {
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/**
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* Calculate the ahash of the provided prepared image.
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*
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* # Returns
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*
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* A u64 representing the value of the hash
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*/
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fn get_hash(&self) -> u64 {
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let (width, height) = self.prepared_image.image.dimensions();
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// calculating the average pixel value
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let mut total = 0u64;
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for pixel in self.prepared_image.image.pixels() {
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let channels = pixel.channels();
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// println!("Pixel is: {}", channels[0]);
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total += channels[0] as u64;
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}
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let mean = total / (width * height) as u64;
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// println!("Mean for {} is {}", prepared_image.orig_path, mean);
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// Calculating a hash based on the mean
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let mut hash = 0u64;
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for pixel in self.prepared_image.image.pixels() {
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let channels = pixel.channels();
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let pixel_sum = channels[0] as u64;
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if pixel_sum >= mean {
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hash |= 1;
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// println!("Pixel {} is >= {} therefore {:b}", pixel_sum, mean, hash);
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} else {
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hash |= 0;
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// println!("Pixel {} is < {} therefore {:b}", pixel_sum, mean, hash);
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}
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hash <<= 1;
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}
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// println!("Hash for {} is {}", prepared_image.orig_path, hash);
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hash
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}
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}
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pub struct DHash<'a> {
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prepared_image: Box<PreparedImage<'a>>,
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}
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impl<'a> DHash<'a> {
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pub fn new(path: &'a Path, precision: &Precision, cache: &'a Cache) -> Self {
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DHash { prepared_image: Box::new(prepare_image(&path, &HashType::Dhash, &precision, &cache)) }
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}
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}
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impl<'a> PerceptualHash for DHash<'a> {
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/**
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* Calculate the dhash of the provided prepared image
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*
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* # Return
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*
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* Returns a u64 representing the value of the hash
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*/
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fn get_hash(&self) -> u64 {
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// Stored for later
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let first_pixel_val = self.prepared_image.image.pixels().nth(0).unwrap().channels()[0];
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let last_pixel_val = self.prepared_image.image.pixels().last().unwrap().channels()[0];
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// Calculate the dhash
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let mut previous_pixel_val = 0u64;
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let mut hash = 0u64;
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for (index, pixel) in self.prepared_image.image.pixels().enumerate() {
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if index == 0 {
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previous_pixel_val = pixel.channels()[0] as u64;
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continue;
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}
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let channels = pixel.channels();
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let pixel_val = channels[0] as u64;
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if pixel_val >= previous_pixel_val {
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hash |= 1;
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} else {
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hash |= 0;
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}
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hash <<= 1;
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previous_pixel_val = channels[0] as u64;
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}
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if first_pixel_val >= last_pixel_val {
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hash |= 1;
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} else {
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hash |= 0;
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}
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hash
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}
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}
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pub struct PHash<'a> {
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prepared_image: Box<PreparedImage<'a>>,
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}
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impl<'a> PHash<'a> {
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pub fn new(path: &'a Path, precision: &Precision, cache: &'a Cache) -> Self {
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PHash { prepared_image: Box::new(prepare_image(&path, &HashType::Phash, &precision, &cache)) }
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}
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}
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impl<'a> PerceptualHash for PHash<'a> {
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/**
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* Calculate the phash of the provided prepared image
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*
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* # Return
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*
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* Returns a u64 representing the value of the hash
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*/
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fn get_hash(&self) -> u64 {
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// Get the image data into a vector to perform the DFT on.
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let width = self.prepared_image.image.width() as usize;
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let height = self.prepared_image.image.height() as usize;
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// Get 2d data to 2d FFT/DFT
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// Either from the cache or calculate it
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// Pretty fast already, so caching doesn't make a huge difference
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// Atleast compared to opening and processing the images
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let mut data_matrix: Vec<Vec<f64>> = Vec::new();
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match self.prepared_image.cache.get_matrix_from_cache(&Path::new(self.prepared_image.orig_path),
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width as u32) {
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Some(matrix) => data_matrix = matrix,
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None => {
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// Preparing the results
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for x in 0..width {
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data_matrix.push(Vec::new());
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for y in 0..height {
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let pos_x = x as u32;
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let pos_y = y as u32;
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data_matrix[x]
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.push(self.prepared_image
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.image
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.get_pixel(pos_x, pos_y)
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.channels()[0] as f64);
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}
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}
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// Perform the 2D DFT operation on our matrix
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calculate_2d_dft(&mut data_matrix);
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// Store this DFT in the cache
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match self.prepared_image.cache.put_matrix_in_cache(&Path::new(self.prepared_image.orig_path),
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width as u32,
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&data_matrix) {
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Ok(_) => {}
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Err(e) => println!("Unable to store matrix in cache. {}", e),
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};
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}
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}
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// Only need the top left quadrant
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let target_width = (width / 4) as usize;
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let target_height = (height / 4) as usize;
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let dft_width = (width / 4) as f64;
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let dft_height = (height / 4) as f64;
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// Calculate the mean
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let mut total = 0f64;
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for x in 0..target_width {
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for y in 0..target_height {
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total += data_matrix[x][y];
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}
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}
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let mean = total / (dft_width * dft_height);
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// Calculating a hash based on the mean
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let mut hash = 0u64;
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for x in 0..target_width {
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// println!("Mean: {} Values: {:?}",mean,data_matrix[x]);
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for y in 0..target_height {
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if data_matrix[x][y] >= mean {
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hash |= 1;
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// println!("Pixel {} is >= {} therefore {:b}", pixel_sum, mean, hash);
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} else {
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hash |= 0;
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// println!("Pixel {} is < {} therefore {:b}", pixel_sum, mean, hash);
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}
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hash <<= 1;
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}
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}
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// println!("Hash for {} is {}", prepared_image.orig_path, hash);
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hash
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}
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}
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// Use a 1D DFT to cacluate the 2D DFT.
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//
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// This is achieved by calculating the DFT for each row, then calculating the
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// DFT for each column of DFT row data. This means that a 32x32 image with have
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// 1024 1D DFT operations performed on it. (Slightly caclulation intensive)
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//
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// This operation is in place on the data in the provided vector
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//
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// Inspired by:
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// http://www.inf.ufsc.br/~visao/khoros/html-dip/c5/s2/front-page.html
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//
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// Checked with:
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// http://calculator.vhex.net/post/calculator-result/2d-discrete-fourier-transform
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//
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fn calculate_2d_dft(data_matrix: &mut Vec<Vec<f64>>) {
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// println!("{:?}", data_matrix);
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let width = data_matrix.len();
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let height = data_matrix[0].len();
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let mut complex_data_matrix = Vec::with_capacity(width);
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// Perform DCT on the columns of data
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for x in 0..width {
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let mut column: Vec<f64> = Vec::with_capacity(height);
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for y in 0..height {
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column.push(data_matrix[x][y]);
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}
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// Perform the DCT on this column
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// println!("column[{}] before: {:?}", x, column);
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let forward_plan = dft::Plan::new(dft::Operation::Forward, column.len());
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column.transform(&forward_plan);
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let complex_column = dft::unpack(&column);
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// println!("column[{}] after: {:?}", x, complex_column);
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complex_data_matrix.push(complex_column);
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}
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// Perform DCT on the rows of data
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for y in 0..height {
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let mut row = Vec::with_capacity(width);
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for x in 0..width {
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row.push(complex_data_matrix[x][y]);
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}
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// Perform DCT on the row
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// println!("row[{}] before: {:?}", y, row);
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let forward_plan = dft::Plan::new(dft::Operation::Forward, row.len());
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row.transform(&forward_plan);
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// println!("row[{}] after: {:?}", y, row);
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// Put the row values back
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for x in 0..width {
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data_matrix[x][y] = round_float(row[x].re);
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}
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}
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}
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fn round_float(f: f64) -> f64 {
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if f >= FLOAT_PRECISION_MAX_1 || f <= FLOAT_PRECISION_MIN_1 {
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f
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} else if f >= FLOAT_PRECISION_MAX_2 || f <= FLOAT_PRECISION_MIN_2 {
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(f * 10_f64).round() / 10_f64
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} else if f >= FLOAT_PRECISION_MAX_3 || f <= FLOAT_PRECISION_MIN_3 {
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(f * 100_f64).round() / 100_f64
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} else if f >= FLOAT_PRECISION_MAX_4 || f <= FLOAT_PRECISION_MIN_4 {
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(f * 1000_f64).round() / 1000_f64
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} else if f >= FLOAT_PRECISION_MAX_5 || f <= FLOAT_PRECISION_MIN_5 {
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(f * 10000_f64).round() / 10000_f64
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} else {
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(f * 100000_f64).round() / 100000_f64
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}
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}
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#[test]
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fn test_2d_dft() {
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let mut test_matrix: Vec<Vec<f64>> = Vec::new();
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test_matrix.push(vec![1f64, 1f64, 1f64, 3f64]);
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test_matrix.push(vec![1f64, 2f64, 2f64, 1f64]);
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test_matrix.push(vec![1f64, 2f64, 2f64, 1f64]);
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test_matrix.push(vec![3f64, 1f64, 1f64, 1f64]);
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println!("{:?}", test_matrix[0]);
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println!("{:?}", test_matrix[1]);
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println!("{:?}", test_matrix[2]);
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println!("{:?}", test_matrix[3]);
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println!("Performing 2d DFT");
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calculate_2d_dft(&mut test_matrix);
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println!("{:?}", test_matrix[0]);
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println!("{:?}", test_matrix[1]);
|
|||
println!("{:?}", test_matrix[2]);
|
|||
println!("{:?}", test_matrix[3]);
|
|||
|
|||
assert!(test_matrix[0][0] == 24_f64);
|
|||
assert!(test_matrix[0][1] == 0_f64);
|
|||
assert!(test_matrix[0][2] == 0_f64);
|
|||
assert!(test_matrix[0][3] == 0_f64);
|
|||
|
|||
assert!(test_matrix[1][0] == 0_f64);
|
|||
assert!(test_matrix[1][1] == 0_f64);
|
|||
assert!(test_matrix[1][2] == -2_f64);
|
|||
assert!(test_matrix[1][3] == 2_f64);
|
|||
|
|||
assert!(test_matrix[2][0] == 0_f64);
|
|||
assert!(test_matrix[2][1] == -2_f64);
|
|||
assert!(test_matrix[2][2] == -4_f64);
|
|||
assert!(test_matrix[2][3] == -2_f64);
|
|||
|
|||
assert!(test_matrix[3][0] == 0_f64);
|
|||
assert!(test_matrix[3][1] == 2_f64);
|
|||
assert!(test_matrix[3][2] == -2_f64);
|
|||
assert!(test_matrix[3][3] == 0_f64);
|
|||
}
|
|||
@ -0,0 +1,61 @@ |
|||
// Copyright 2016 Drew Short <drew@sothr.com>.
|
|||
//
|
|||
// Licensed under the MIT license<LICENSE-MIT or http://opensource.org/licenses/MIT>.
|
|||
// This file may not be copied, modified, or distributed except according to those terms.
|
|||
|
|||
use super::{HashType, PerceptualHash, Precision, PreparedImage};
|
|||
use super::prepare_image;
|
|||
use super::image::{GenericImage, Pixel};
|
|||
use std::path::Path;
|
|||
use cache::Cache;
|
|||
|
|||
pub struct AHash<'a> {
|
|||
prepared_image: Box<PreparedImage<'a>>,
|
|||
}
|
|||
|
|||
impl<'a> AHash<'a> {
|
|||
pub fn new(path: &'a Path, precision: &Precision, cache: &'a Cache) -> Self {
|
|||
AHash { prepared_image: Box::new(prepare_image(&path, &HashType::AHash, &precision, &cache)) }
|
|||
}
|
|||
}
|
|||
|
|||
impl<'a> PerceptualHash for AHash<'a> {
|
|||
/**
|
|||
* Calculate the ahash of the provided prepared image.
|
|||
*
|
|||
* # Returns
|
|||
*
|
|||
* A u64 representing the value of the hash
|
|||
*/
|
|||
fn get_hash(&self) -> u64 {
|
|||
let (width, height) = self.prepared_image.image.dimensions();
|
|||
|
|||
// calculating the average pixel value
|
|||
let mut total = 0u64;
|
|||
for pixel in self.prepared_image.image.pixels() {
|
|||
let channels = pixel.channels();
|
|||
// println!("Pixel is: {}", channels[0]);
|
|||
total += channels[0] as u64;
|
|||
}
|
|||
let mean = total / (width * height) as u64;
|
|||
// println!("Mean for {} is {}", prepared_image.orig_path, mean);
|
|||
|
|||
// Calculating a hash based on the mean
|
|||
let mut hash = 0u64;
|
|||
for pixel in self.prepared_image.image.pixels() {
|
|||
let channels = pixel.channels();
|
|||
let pixel_sum = channels[0] as u64;
|
|||
if pixel_sum >= mean {
|
|||
hash |= 1;
|
|||
// println!("Pixel {} is >= {} therefore {:b}", pixel_sum, mean, hash);
|
|||
} else {
|
|||
hash |= 0;
|
|||
// println!("Pixel {} is < {} therefore {:b}", pixel_sum, mean, hash);
|
|||
}
|
|||
hash <<= 1;
|
|||
}
|
|||
// println!("Hash for {} is {}", prepared_image.orig_path, hash);
|
|||
|
|||
hash
|
|||
}
|
|||
}
|
|||
@ -0,0 +1,62 @@ |
|||
// Copyright 2016 Drew Short <drew@sothr.com>.
|
|||
//
|
|||
// Licensed under the MIT license<LICENSE-MIT or http://opensource.org/licenses/MIT>.
|
|||
// This file may not be copied, modified, or distributed except according to those terms.
|
|||
|
|||
use super::{HashType, PerceptualHash, Precision, PreparedImage};
|
|||
use super::prepare_image;
|
|||
use super::image::{GenericImage, Pixel};
|
|||
use std::path::Path;
|
|||
use cache::Cache;
|
|||
|
|||
pub struct DHash<'a> {
|
|||
prepared_image: Box<PreparedImage<'a>>,
|
|||
}
|
|||
|
|||
impl<'a> DHash<'a> {
|
|||
pub fn new(path: &'a Path, precision: &Precision, cache: &'a Cache) -> Self {
|
|||
DHash { prepared_image: Box::new(prepare_image(&path, &HashType::DHash, &precision, &cache)) }
|
|||
}
|
|||
}
|
|||
|
|||
impl<'a> PerceptualHash for DHash<'a> {
|
|||
/**
|
|||
* Calculate the dhash of the provided prepared image
|
|||
*
|
|||
* # Return
|
|||
*
|
|||
* Returns a u64 representing the value of the hash
|
|||
*/
|
|||
fn get_hash(&self) -> u64 {
|
|||
// Stored for later
|
|||
let first_pixel_val = self.prepared_image.image.pixels().nth(0).unwrap().channels()[0];
|
|||
let last_pixel_val = self.prepared_image.image.pixels().last().unwrap().channels()[0];
|
|||
|
|||
// Calculate the dhash
|
|||
let mut previous_pixel_val = 0u64;
|
|||
let mut hash = 0u64;
|
|||
for (index, pixel) in self.prepared_image.image.pixels().enumerate() {
|
|||
if index == 0 {
|
|||
previous_pixel_val = pixel.channels()[0] as u64;
|
|||
continue;
|
|||
}
|
|||
let channels = pixel.channels();
|
|||
let pixel_val = channels[0] as u64;
|
|||
if pixel_val >= previous_pixel_val {
|
|||
hash |= 1;
|
|||
} else {
|
|||
hash |= 0;
|
|||
}
|
|||
hash <<= 1;
|
|||
previous_pixel_val = channels[0] as u64;
|
|||
}
|
|||
|
|||
if first_pixel_val >= last_pixel_val {
|
|||
hash |= 1;
|
|||
} else {
|
|||
hash |= 0;
|
|||
}
|
|||
|
|||
hash
|
|||
}
|
|||
}
|
|||
@ -0,0 +1,197 @@ |
|||
// Copyright 2016 Drew Short <drew@sothr.com>.
|
|||
//
|
|||
// Licensed under the MIT license<LICENSE-MIT or http://opensource.org/licenses/MIT>.
|
|||
// This file may not be copied, modified, or distributed except according to those terms.
|
|||
|
|||
extern crate dft;
|
|||
extern crate image;
|
|||
|
|||
mod ahash;
|
|||
mod dhash;
|
|||
mod phash;
|
|||
|
|||
use std::path::Path;
|
|||
use std::f64;
|
|||
use self::image::{Pixel, FilterType};
|
|||
use cache::Cache;
|
|||
|
|||
// Constants //
|
|||
|
|||
// Used to get ranges for the precision of rounding floats
|
|||
// Can round to 1 significant factor of precision
|
|||
const FLOAT_PRECISION_MAX_1: f64 = f64::MAX / 10_f64;
|
|||
const FLOAT_PRECISION_MIN_1: f64 = f64::MIN / 10_f64;
|
|||
// Can round to 2 significant factors of precision
|
|||
const FLOAT_PRECISION_MAX_2: f64 = f64::MAX / 100_f64;
|
|||
const FLOAT_PRECISION_MIN_2: f64 = f64::MIN / 100_f64;
|
|||
// Can round to 3 significant factors of precision
|
|||
const FLOAT_PRECISION_MAX_3: f64 = f64::MAX / 1000_f64;
|
|||
const FLOAT_PRECISION_MIN_3: f64 = f64::MIN / 1000_f64;
|
|||
// Can round to 4 significant factors of precision
|
|||
const FLOAT_PRECISION_MAX_4: f64 = f64::MAX / 10000_f64;
|
|||
const FLOAT_PRECISION_MIN_4: f64 = f64::MIN / 10000_f64;
|
|||
// Can round to 5 significant factors of precision
|
|||
const FLOAT_PRECISION_MAX_5: f64 = f64::MAX / 100000_f64;
|
|||
const FLOAT_PRECISION_MIN_5: f64 = f64::MIN / 100000_f64;
|
|||
|
|||
// Structs/Enums //
|
|||
|
|||
/**
|
|||
* Prepared image that can be used to generate hashes
|
|||
*/
|
|||
pub struct PreparedImage<'a> {
|
|||
orig_path: &'a str,
|
|||
image: image::ImageBuffer<image::Luma<u8>, Vec<u8>>,
|
|||
cache: &'a Cache<'a>,
|
|||
}
|
|||
|
|||
/**
|
|||
* Wraps the various perceptual hashes
|
|||
*/
|
|||
pub struct PerceptualHashes<'a> {
|
|||
pub orig_path: &'a str,
|
|||
pub ahash: u64,
|
|||
pub dhash: u64,
|
|||
pub phash: u64,
|
|||
}
|
|||
|
|||
/**
|
|||
* All the supported precision types
|
|||
*
|
|||
* Low aims for 32 bit precision
|
|||
* Medium aims for 64 bit precision
|
|||
* High aims for 128 bit precision
|
|||
*/
|
|||
#[allow(dead_code)]
|
|||
pub enum Precision {
|
|||
Low,
|
|||
Medium,
|
|||
High,
|
|||
}
|
|||
|
|||
// Get the size of the required image
|
|||
//
|
|||
impl Precision {
|
|||
fn get_size(&self) -> u32 {
|
|||
match *self {
|
|||
Precision::Low => 4,
|
|||
Precision::Medium => 8,
|
|||
Precision::High => 16,
|
|||
}
|
|||
}
|
|||
}
|
|||
|
|||
/**
|
|||
* Types of hashes supported
|
|||
*/
|
|||
pub enum HashType {
|
|||
AHash,
|
|||
DHash,
|
|||
PHash,
|
|||
}
|
|||
|
|||
// Traits //
|
|||
|
|||
pub trait PerceptualHash {
|
|||
fn get_hash(&self) -> u64;
|
|||
}
|
|||
|
|||
// Functions //
|
|||
|
|||
/**
|
|||
* Resonsible for parsing a path, converting an image and package it to be
|
|||
* hashed.
|
|||
*
|
|||
* # Arguments
|
|||
*
|
|||
* * 'path' - The path to the image requested to be hashed
|
|||
* * 'size' - The size that the image should be resize to, in the form of size x size
|
|||
*
|
|||
* # Returns
|
|||
*
|
|||
* A PreparedImage struct with the required information for performing hashing
|
|||
*
|
|||
*/
|
|||
pub fn prepare_image<'a>(path: &'a Path,
|
|||
hash_type: &HashType,
|
|||
precision: &Precision,
|
|||
cache: &'a Cache<'a>)
|
|||
-> PreparedImage<'a> {
|
|||
let image_path = path.to_str().unwrap();
|
|||
let size: u32 = match *hash_type {
|
|||
HashType::PHash => precision.get_size() * 4,
|
|||
_ => precision.get_size(),
|
|||
};
|
|||
// Check if we have the already converted image in a cache and use that if possible.
|
|||
match cache.get_image_from_cache(&path, size) {
|
|||
Some(image) => {
|
|||
PreparedImage {
|
|||
orig_path: &*image_path,
|
|||
image: image,
|
|||
cache: &cache
|
|||
}
|
|||
}
|
|||
None => {
|
|||
// Otherwise let's do that work now and store it.
|
|||
let image = image::open(path).unwrap();
|
|||
let small_image = image.resize_exact(size, size, FilterType::Lanczos3);
|
|||
let grey_image = small_image.to_luma();
|
|||
match cache.put_image_in_cache(&path, size, &grey_image) {
|
|||
Ok(_) => {}
|
|||
Err(e) => println!("Unable to store image in cache. {}", e),
|
|||
};
|
|||
PreparedImage {
|
|||
orig_path: &*image_path,
|
|||
image: grey_image,
|
|||
cache: &cache,
|
|||
}
|
|||
}
|
|||
}
|
|||
}
|
|||
|
|||
/**
|
|||
* Get a specific HashType hash
|
|||
*/
|
|||
pub fn get_perceptual_hash<'a>(path: &'a Path, precision: &Precision, hash_type: &HashType, cache: &Cache) -> u64 {
|
|||
match *hash_type {
|
|||
HashType::AHash => ahash::AHash::new(&path, &precision, &cache).get_hash(),
|
|||
HashType::DHash => dhash::DHash::new(&path, &precision, &cache).get_hash(),
|
|||
HashType::PHash => phash::PHash::new(&path, &precision, &cache).get_hash()
|
|||
}
|
|||
}
|
|||
|
|||
/**
|
|||
* Get all perceptual hashes for an image
|
|||
*/
|
|||
pub fn get_perceptual_hashes<'a>(path: &'a Path, precision: &Precision, cache: &Cache) -> PerceptualHashes<'a> {
|
|||
let image_path = path.to_str().unwrap();
|
|||
let ahash = ahash::AHash::new(&path, &precision, &cache).get_hash();
|
|||
let dhash = dhash::DHash::new(&path, &precision, &cache).get_hash();
|
|||
let phash = phash::PHash::new(&path, &precision, &cache).get_hash();
|
|||
PerceptualHashes {
|
|||
orig_path: &*image_path,
|
|||
ahash: ahash,
|
|||
dhash: dhash,
|
|||
phash: phash,
|
|||
}
|
|||
}
|
|||
|
|||
/**
|
|||
* Calculate the number of bits different between two hashes
|
|||
* Add to the PerceptualHashTrait
|
|||
*/
|
|||
pub fn calculate_hamming_distance(hash1: u64, hash2: u64) -> u64 {
|
|||
// The binary xor of the two hashes should give us a number representing
|
|||
// the differences between the two hashes. All that's left is to count
|
|||
// the number of 1's in the difference to determine the hamming distance
|
|||
let bin_diff = hash1 ^ hash2;
|
|||
let bin_diff_str = format!("{:b}", bin_diff);
|
|||
let mut hamming = 0u64;
|
|||
for bit in bin_diff_str.chars() {
|
|||
match bit {
|
|||
'1' => hamming += 1,
|
|||
_ => continue,
|
|||
}
|
|||
}
|
|||
hamming
|
|||
}
|
|||
@ -0,0 +1,219 @@ |
|||
// Copyright 2016 Drew Short <drew@sothr.com>.
|
|||
//
|
|||
// Licensed under the MIT license<LICENSE-MIT or http://opensource.org/licenses/MIT>.
|
|||
// This file may not be copied, modified, or distributed except according to those terms.
|
|||
|
|||
use super::dft;
|
|||
use super::dft::Transform;
|
|||
use super::{HashType, PerceptualHash, Precision, PreparedImage};
|
|||
use super::prepare_image;
|
|||
use super::image::{GenericImage, Pixel};
|
|||
use std::path::Path;
|
|||
use cache::Cache;
|
|||
|
|||
pub struct PHash<'a> {
|
|||
prepared_image: Box<PreparedImage<'a>>,
|
|||
}
|
|||
|
|||
impl<'a> PHash<'a> {
|
|||
pub fn new(path: &'a Path, precision: &Precision, cache: &'a Cache) -> Self {
|
|||
PHash { prepared_image: Box::new(prepare_image(&path, &HashType::PHash, &precision, &cache)) }
|
|||
}
|
|||
}
|
|||
|
|||
impl<'a> PerceptualHash for PHash<'a> {
|
|||
/**
|
|||
* Calculate the phash of the provided prepared image
|
|||
*
|
|||
* # Return
|
|||
*
|
|||
* Returns a u64 representing the value of the hash
|
|||
*/
|
|||
fn get_hash(&self) -> u64 {
|
|||
// Get the image data into a vector to perform the DFT on.
|
|||
let width = self.prepared_image.image.width() as usize;
|
|||
let height = self.prepared_image.image.height() as usize;
|
|||
|
|||
// Get 2d data to 2d FFT/DFT
|
|||
// Either from the cache or calculate it
|
|||
// Pretty fast already, so caching doesn't make a huge difference
|
|||
// Atleast compared to opening and processing the images
|
|||
let mut data_matrix: Vec<Vec<f64>> = Vec::new();
|
|||
match self.prepared_image.cache.get_matrix_from_cache(&Path::new(self.prepared_image.orig_path),
|
|||
width as u32) {
|
|||
Some(matrix) => data_matrix = matrix,
|
|||
None => {
|
|||
// Preparing the results
|
|||
for x in 0..width {
|
|||
data_matrix.push(Vec::new());
|
|||
for y in 0..height {
|
|||
let pos_x = x as u32;
|
|||
let pos_y = y as u32;
|
|||
data_matrix[x]
|
|||
.push(self.prepared_image
|
|||
.image
|
|||
.get_pixel(pos_x, pos_y)
|
|||
.channels()[0] as f64);
|
|||
}
|
|||
}
|
|||
|
|||
// Perform the 2D DFT operation on our matrix
|
|||
calculate_2d_dft(&mut data_matrix);
|
|||
// Store this DFT in the cache
|
|||
match self.prepared_image.cache.put_matrix_in_cache(&Path::new(self.prepared_image.orig_path),
|
|||
width as u32,
|
|||
&data_matrix) {
|
|||
Ok(_) => {}
|
|||
Err(e) => println!("Unable to store matrix in cache. {}", e),
|
|||
};
|
|||
}
|
|||
}
|
|||
|
|||
// Only need the top left quadrant
|
|||
let target_width = (width / 4) as usize;
|
|||
let target_height = (height / 4) as usize;
|
|||
let dft_width = (width / 4) as f64;
|
|||
let dft_height = (height / 4) as f64;
|
|||
|
|||
// Calculate the mean
|
|||
let mut total = 0f64;
|
|||
for x in 0..target_width {
|
|||
for y in 0..target_height {
|
|||
total += data_matrix[x][y];
|
|||
}
|
|||
}
|
|||
let mean = total / (dft_width * dft_height);
|
|||
|
|||
// Calculating a hash based on the mean
|
|||
let mut hash = 0u64;
|
|||
for x in 0..target_width {
|
|||
// println!("Mean: {} Values: {:?}",mean,data_matrix[x]);
|
|||
for y in 0..target_height {
|
|||
if data_matrix[x][y] >= mean {
|
|||
hash |= 1;
|
|||
// println!("Pixel {} is >= {} therefore {:b}", pixel_sum, mean, hash);
|
|||
} else {
|
|||
hash |= 0;
|
|||
// println!("Pixel {} is < {} therefore {:b}", pixel_sum, mean, hash);
|
|||
}
|
|||
hash <<= 1;
|
|||
}
|
|||
}
|
|||
// println!("Hash for {} is {}", prepared_image.orig_path, hash);
|
|||
hash
|
|||
}
|
|||
}
|
|||
|
|||
// Use a 1D DFT to cacluate the 2D DFT.
|
|||
//
|
|||
// This is achieved by calculating the DFT for each row, then calculating the
|
|||
// DFT for each column of DFT row data. This means that a 32x32 image with have
|
|||
// 1024 1D DFT operations performed on it. (Slightly caclulation intensive)
|
|||
//
|
|||
// This operation is in place on the data in the provided vector
|
|||
//
|
|||
// Inspired by:
|
|||
// http://www.inf.ufsc.br/~visao/khoros/html-dip/c5/s2/front-page.html
|
|||
//
|
|||
// Checked with:
|
|||
// http://calculator.vhex.net/post/calculator-result/2d-discrete-fourier-transform
|
|||
//
|
|||
fn calculate_2d_dft(data_matrix: &mut Vec<Vec<f64>>) {
|
|||
// println!("{:?}", data_matrix);
|
|||
let width = data_matrix.len();
|
|||
let height = data_matrix[0].len();
|
|||
|
|||
let mut complex_data_matrix = Vec::with_capacity(width);
|
|||
|
|||
// Perform DCT on the columns of data
|
|||
for x in 0..width {
|
|||
let mut column: Vec<f64> = Vec::with_capacity(height);
|
|||
for y in 0..height {
|
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column.push(data_matrix[x][y]);
|
|||
}
|
|||
|
|||
// Perform the DCT on this column
|
|||
// println!("column[{}] before: {:?}", x, column);
|
|||
let forward_plan = dft::Plan::new(dft::Operation::Forward, column.len());
|
|||
column.transform(&forward_plan);
|
|||
let complex_column = dft::unpack(&column);
|
|||
// println!("column[{}] after: {:?}", x, complex_column);
|
|||
complex_data_matrix.push(complex_column);
|
|||
}
|
|||
|
|||
// Perform DCT on the rows of data
|
|||
for y in 0..height {
|
|||
let mut row = Vec::with_capacity(width);
|
|||
for x in 0..width {
|
|||
row.push(complex_data_matrix[x][y]);
|
|||
}
|
|||
// Perform DCT on the row
|
|||
// println!("row[{}] before: {:?}", y, row);
|
|||
let forward_plan = dft::Plan::new(dft::Operation::Forward, row.len());
|
|||
row.transform(&forward_plan);
|
|||
// println!("row[{}] after: {:?}", y, row);
|
|||
|
|||
// Put the row values back
|
|||
for x in 0..width {
|
|||
data_matrix[x][y] = round_float(row[x].re);
|
|||
}
|
|||
}
|
|||
}
|
|||
|
|||
fn round_float(f: f64) -> f64 {
|
|||
if f >= super::FLOAT_PRECISION_MAX_1 || f <= super::FLOAT_PRECISION_MIN_1 {
|
|||
f
|
|||
} else if f >= super::FLOAT_PRECISION_MAX_2 || f <= super::FLOAT_PRECISION_MIN_2 {
|
|||
(f * 10_f64).round() / 10_f64
|
|||
} else if f >= super::FLOAT_PRECISION_MAX_3 || f <= super::FLOAT_PRECISION_MIN_3 {
|
|||
(f * 100_f64).round() / 100_f64
|
|||
} else if f >= super::FLOAT_PRECISION_MAX_4 || f <= super::FLOAT_PRECISION_MIN_4 {
|
|||
(f * 1000_f64).round() / 1000_f64
|
|||
} else if f >= super::FLOAT_PRECISION_MAX_5 || f <= super::FLOAT_PRECISION_MIN_5 {
|
|||
(f * 10000_f64).round() / 10000_f64
|
|||
} else {
|
|||
(f * 100000_f64).round() / 100000_f64
|
|||
}
|
|||
}
|
|||
|
|||
#[test]
|
|||
fn test_2d_dft() {
|
|||
let mut test_matrix: Vec<Vec<f64>> = Vec::new();
|
|||
test_matrix.push(vec![1f64, 1f64, 1f64, 3f64]);
|
|||
test_matrix.push(vec![1f64, 2f64, 2f64, 1f64]);
|
|||
test_matrix.push(vec![1f64, 2f64, 2f64, 1f64]);
|
|||
test_matrix.push(vec![3f64, 1f64, 1f64, 1f64]);
|
|||
|
|||
println!("{:?}", test_matrix[0]);
|
|||
println!("{:?}", test_matrix[1]);
|
|||
println!("{:?}", test_matrix[2]);
|
|||
println!("{:?}", test_matrix[3]);
|
|||
|
|||
println!("Performing 2d DFT");
|
|||
calculate_2d_dft(&mut test_matrix);
|
|||
|
|||
println!("{:?}", test_matrix[0]);
|
|||
println!("{:?}", test_matrix[1]);
|
|||
println!("{:?}", test_matrix[2]);
|
|||
println!("{:?}", test_matrix[3]);
|
|||
|
|||
assert!(test_matrix[0][0] == 24_f64);
|
|||
assert!(test_matrix[0][1] == 0_f64);
|
|||
assert!(test_matrix[0][2] == 0_f64);
|
|||
assert!(test_matrix[0][3] == 0_f64);
|
|||
|
|||
assert!(test_matrix[1][0] == 0_f64);
|
|||
assert!(test_matrix[1][1] == 0_f64);
|
|||
assert!(test_matrix[1][2] == -2_f64);
|
|||
assert!(test_matrix[1][3] == 2_f64);
|
|||
|
|||
assert!(test_matrix[2][0] == 0_f64);
|
|||
assert!(test_matrix[2][1] == -2_f64);
|
|||
assert!(test_matrix[2][2] == -4_f64);
|
|||
assert!(test_matrix[2][3] == -2_f64);
|
|||
|
|||
assert!(test_matrix[3][0] == 0_f64);
|
|||
assert!(test_matrix[3][1] == 2_f64);
|
|||
assert!(test_matrix[3][2] == -2_f64);
|
|||
assert!(test_matrix[3][3] == 0_f64);
|
|||
}
|
|||
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