/global-contrast-factor-python

Primary LanguagePython

Global Contrast Factor

Python implementation of Global Contrast Factor - a New Approach to Image Contrast

$$l = (\frac{k}{255})^\gamma \quad L = 100 * \sqrt{l}$$ $$lc_i = \frac{|L_i - L_{i-1}|+|L_i - L_{i+1}|+|L_i - L_{i-w}|+|L_i - L_{i+w}|}{4}$$ $$C_i = \frac{1}{w*h} * \sum_{i=1}^{w*h} lc_i \quad GCF = \sum_{i=1}^{N} w_i * C_i$$

Usage

import cv2
from global_contrast_factor import GlobalContrastFactor

img = cv2.imread("./images/img1.png")
img_low_contrast = cv2.imread("./images/img_contrast50.png")

gfc = GlobalContrastFactor()

print(gfc(img))
print(gfc(img_low_contrast))

Install

pip install global-contrast-factor-python

Citations

@inproceedings{Matkovic2005GCF,
    title   = {Global Contrast Factor - a New Approach to Image Contrast},
    author  = {Krešimir Matkovic, László Neumann, Attila Neumann, Thomas Psik, Werner Purgathofer},
    year    = {2005}
}