https://github.com/manelli/dhashion

dHash in Ruby
https://github.com/manelli/dhashion

Last synced: 7 days ago
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dHash in Ruby

• Host: GitHub
• URL: https://github.com/manelli/dhashion
• Owner: manelli
• License: mit
• Created: 2014-12-15T01:34:31.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2014-12-15T18:29:35.000Z (almost 10 years ago)
• Last Synced: 2024-04-24T16:04:18.402Z (7 months ago)
• Language: Ruby
• Size: 129 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
# Dhashion

### _Lagrangian dHash for Ruby_

---

## Installation

    $ gem install dhashion

## Usage

```ruby

img1 = Dhashion::Image.new('img1_filepath.jpg')

img2 = Dhashion::Image.new('img2_filepath.jpg')

Dhashion.distance(img1.fingerprint, img2.fingerprint) 

```

## Description

Dhashion is a Ruby implementation for the _dHash_ (difference hashing) algorithm.

Unlike other perceptual hashing algorithms like _aHash_ (average values) and

_pHash_ (frequency patterns), _dHash_ tracks gradients.

Dhashion specifically uses ImageMagick's _Lagrange_ filter when resizing the

image.

## Additional information

* http://www.hackerfactor.com/blog/?/archives/529-Kind-of-Like-That.html

* http://www.hackerfactor.com/blog/index.php?/archives/432-Looks-Like-It.html

* http://www.imagemagick.org/Usage/filter/#lagrange