Image Hasher

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:
http://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.

This is fork of img_hash library, but with updated dependencies and some new features.

I am not familiar with this library, so if you have a need/willingness to develop it, I can add you as a co-maintainer.

Usage

Documentation

Add image_hasher to your Cargo.toml:

image_hasher = "2.0.0"

Example program:

use image_hasher::{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));
}

Minimal version

Minimal version of Rust required to build this crate is 1.67.1.
To be able to use it, you need to pin some external dependencies to lower versions - look at CI to see which version is compatible with this crate.

Benchmarking

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 +nightly bench

License

Licensed under either of

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

at your option.

Contribution

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.