Using histogram equalization in color image in js-CodePudding

I want to use OpenCV histogram equalization with color image output but I didn't find a way to do this. here is the tutorial: https://docs.opencv.org/3.4/d2/d74/tutorial_js_histogram_equalization.html

let src = cv.imread('canvasInput');
let dst = new cv.Mat();
cv.cvtColor(src, src, cv.COLOR_RGBA2GRAY, 0);
cv.equalizeHist(src, dst);
cv.imshow('canvasOutput', src);
cv.imshow('canvasOutput', dst);
src.delete(); dst.delete();

this code converts image to gray.

are there any better ways for histogram equalization in js?

CodePudding user response：

you can use histogram equalization with color images:

cvtConvert() to hsv (not grayscale)
split() the hsv image into seperate h,s,v planes
apply equalizeHist() on the V (grayscale intensity) channel
merge() hsv planes back
cvtConvert() back to RGBA