A library for getting perceptual hash values of images.

Thanks to Dr. Neal Krawetz for the outlines of the Mean (aHash), Gradient (dHash), and DCT (pHash) perceptual hash algorithms:
https://www.hackerfactor.com/blog/?/archives/432-Looks-Like-It.html (Accessed August 2014)

Also provides an implementation of the Blockhash.io algorithm.

This crate can operate directly on buffers from the PistonDevelopers/image crate.

Documentation

Add img_hash to your Cargo.toml:

[dependencies.img_hash]
version = "3.0"

Example program:

 extern crate image;
 extern crate img_hash;
 
 use img_hash::{HasherConfig, HashAlg};
 fn main() {
     let image1 = image::open("image1.png").unwrap();
     let image2 = image::open("image2.png").unwrap();
     
     let hasher = HasherConfig::new().to_hasher();
     let hash1 = hasher.hash_image(&image1);
     let hash2 = hasher.hash_image(&image2);
     
     println!("Image1 hash: {}", hash1.to_base64());
     println!("Image2 hash: {}", hash2.to_base64());
     
     println!("Hamming Distance: {}", hash1.dist(&hash2));
 }

In order to build and test on Rust stable, the benchmarks have to be placed behind a feature gate. If you have Rust nightly installed and want to run benchmarks, use the following command:

cargo bench --features bench

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.