#image #compare #signature #gradient #differential #hash #requires

bin+lib dhash

An implementation of dhash image signatures for rust

1 unstable release

0.1.0 Mar 6, 2019

#23 in #differential

23 downloads per month

MIT/Apache

8KB
71 lines

Dhash

This crate allows a dhash signature to be constructed from an image.

Requires the image crate

A dhash is a differential gradient hash that compares the difference in gradient between adjacent pixels, and provides a 64 bit signature of an image.

A dhash can be used to compare against other images for similarity and is resilient to differences in:

  • Aspect Ratio
  • Image Size
  • Brightness and Contrast

Implementation details taken from the Kind of Like That blog

Usage (CLI)

Install this crate:

cargo install dhash

Run dhash <img1> to print out a dhash of the image at path img1

$ dhash test.jpg
dhash for test.jpg is `13547707017824698364`

Run dhash <img1> <img2> to print out a dhash of both images and the distance between them (a lower number is closer):

$ dhash test.jpg other.jpg
dhash for test.jpg is `4485936524854165493`
dhash for other.jpg is `3337201687795727957`
distance is: 11

Dependencies

~9–18MB
~211K SLoC