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: bash cargo install dhash

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

bash $ 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):

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