compimg 0.2.0

Image similarity metrics.

compimg

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Introduction

For full documentation visit documentation site.

Image similarity metrics are often used in image quality assessment for performance evaluation of image restoration and reconstruction algorithms. They require two images:

• test image (image of interest)
• reference image (image we compare against)

Such metrics produce numerical value.

Such methods are are widely called full/reduced-reference methods for assessing image quality.

compimg package is all about calculating similarity between images. It provides image similarity metrics (PSNR, SSIM etc.) that are widely used to asses image quality.

import numpy as np
from compimg.similarity import SSIM
some_grayscale_image = np.ones((20,20), dtype=np.uint8)
identical_image = np.ones((20,20), dtype=np.uint8)
result = SSIM().compare(some_grayscale_image, identical_image)
assert result == 1.0

Features

• common metrics for calculating similarity of one image to another
• only numpy as a dependency

Installation

compimg is available on PyPI. You can install it using pip:
pip install compimg

Note

Keep in mind that metrics are not aware of what kind of image you are passing. If metric relies on intensity values and you have YCbCr image you should pass only the first channel to the computing routine.

Help

If you have any problems or questions please post an issue.