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Entropy-based image border detection algorithm library

Project description

Entropy-based image border detection algorithm: finds out if your image has borders or whitespaces around and helps you to trim border providing whitespace offsets for every side of a picture, supports animated GIFs.

pypi version travis ci build status

Algorithm (simplified)

For each side of the image starting from top, rotating image counterclockwise to keep side of interest on top:

  • Get upper block 25% of image height

  • Get lower block with the same height as the upper one

  • Calculate entropy for both blocks and their difference

  • Make upper block 1px less

  • Repeat from p.2 until we hit image edge

  • Border is between blocks with entropy difference maximum

Sliding from center to edge - searching for maximum entropy difference


Python 3.5+


python-3.6 -m venv .env
source .env/bin/activate
pip install enimda


Find if image has borders:

from enimda import ENIMDA

# Load target image
em = ENIMDA(fp='test.jpg')

# Scan for borders with high precision
borders = em.scan(fast=False)

# Print found image borders (tuple): top, right, bottom, left


For demo please refer to ENIMDA Demo

Also it lives at Picture Instruments as ‘Remove borders’ instrument


Run tests: py.test

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