Skip to main content
Help us improve Python packaging – donate today!

Image Hashing library

Project Description

A image hashing library written in Python. ImageHash supports:

  • average hashing (aHash)
  • perception hashing (pHash)
  • difference hashing (dHash)
  • wavelet hashing (wHash)

Travis Coveralls

Rationale

Why can we not use md5, sha-1, etc.?

Unfortunately, we cannot use cryptographic hashing algorithms in our implementation. Due to the nature of cryptographic hashing algorithms, very tiny changes in the input file will result in a substantially different hash. In the case of image fingerprinting, we actually want our similar inputs to have similar output hashes as well.

Requirements

Based on PIL/Pillow Image, numpy and scipy.fftpack (for pHash) Easy installation through pypi.

Basic usage

>>> from PIL import Image
>>> import imagehash
>>> hash = imagehash.average_hash(Image.open('test.png'))
>>> print(hash)
d879f8f89b1bbf
>>> otherhash = imagehash.average_hash(Image.open('other.bmp'))
>>> print(otherhash)
ffff3720200ffff
>>> print(hash == otherhash)
False
>>> print(hash - otherhash)
36

The demo script find_similar_images illustrates how to find similar images in a directory.

Source hosted at github: https://github.com/JohannesBuchner/imagehash

Changelog

  • 4.0: Changed binary to hex implementation, because the previous one was broken for various hash sizes. This change breaks compatibility to previously stored hashes; to convert them from the old encoding, use the “old_hex_to_hash” function.
  • 3.5: image data handling speed-up
  • 3.2: whash now also handles smaller-than-hash images
  • 3.0: dhash had a bug: It computed pixel differences vertically, not horizontally.
    I modified it to follow dHash. The old function is available as dhash_vertical.
  • 2.0: added whash
  • 1.0: initial ahash, dhash, phash implementations.

Release history Release notifications

This version
History Node

4.0

History Node

3.7

History Node

3.5

History Node

3.4

History Node

3.3

History Node

3.2

History Node

3.1

History Node

3.0

History Node

2.2

History Node

2.1

History Node

2.0

History Node

1.0

History Node

0.3

History Node

0.2

History Node

0.1

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
ImageHash-4.0-py2.7.egg (305.6 kB) Copy SHA256 hash SHA256 Egg 2.7 Dec 7, 2017
ImageHash-4.0-py2.py3-none-any.whl (295.6 kB) Copy SHA256 hash SHA256 Wheel 2.7 Dec 7, 2017
ImageHash-4.0-py3.5.egg (306.5 kB) Copy SHA256 hash SHA256 Egg 3.5 Dec 7, 2017
ImageHash-4.0.tar.gz (296.4 kB) Copy SHA256 hash SHA256 Source None Dec 7, 2017

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging CloudAMQP CloudAMQP RabbitMQ AWS AWS Cloud computing Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page