bigpear123 / phash

perceptual hash - an algorithm that compares the hashes of two images and returns their similarity

phash

Perceptual Hashing Alogrithim that compares two images

About

This perceptual hashing algorithm will determine if two images are similar (same) or different. The result will show the hash value differences. From a high level the two images are reduced,greyscaled,averaged,compared to the average, and hashed. The hash results are then compared for similiarties.

Set Up

This app is built on python3. You will need numpy and PIL

pip3 install PIL

You should change the shabang (#!) at the begining of the file if your python3 executable path is not under /usr/bin/env

Running

To run the program simply run the following command on your terminal emulator of choice.

python3 main.py IMG1_PATH.jpg IMG2_PATH.jpg

The results will then be printed as stdout. If the file is unopenable by PIL it will raise an exception.

Inspiration and Sources

• http://www.phash.org/
• http://www.hackerfactor.com/blog/?/archives/432-Looks-Like-It.html

footnote

I may plan on expanding this project into making the algorithm more versatile and robust in handling different types of images and potentially videos (Frame by Frame).