Re: Acquiring Dental RVG on Linux

[Karsten Hilbert <Karsten.Hilbert@gmx.net>]

Am Mon, Jan 03, 2022 at 10:31:32AM +0100 schrieb Jakub Wilk:

> You may want to give CLAHE (Contrast Limited Adaptive Histogram Equalization) a try.
>
> It's implemented in OpenCV.

For what it's worth, here's code which so does:



#!/usr/bin/env python3

import cv2
import numpy as np

image = cv2.imread('bypyrvg.png')

image_bw = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

for cl in [1,2,3,4,5,10,20,40,80,100,150,300]:
	for tgl in [1, 2, 3, 4, 5, 10]:
		for offset in [0, 1, 30, 250]:
			clahe = cv2.createCLAHE(clipLimit = cl, tileGridSize = (tgl, tgl))
			clahe_img = clahe.apply(image_bw) + offset
			cv2.imwrite('byclahe-cl%s-tgl%s-ofs%s.png' % (cl, tgl, offset), clahe_img)




Karsten
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