Histogram equalization not working on color image - OpenCV

Question

I am trying to perform a histogram equalization using OpenCV using the following function

Mat Histogram::Equalization(const Mat& inputImage)
{
    if(inp         


        

Answer 1

And the python version, @sga:

import cv2
import os

def hisEqulColor(img):
    ycrcb=cv2.cvtColor(img,cv2.COLOR_BGR2YCR_CB)
    channels=cv2.split(ycrcb)
    print len(channels)
    cv2.equalizeHist(channels[0],channels[0])
    cv2.merge(channels,ycrcb)
    cv2.cvtColor(ycrcb,cv2.COLOR_YCR_CB2BGR,img)
    return img


fname='./your.jpg'
img=cv2.imread(fname)

cv2.imshow('img', img)
img2=hisEqulColor(img)
cv2.imshow('img2',img2)

However this will produce noise in the image (Eg, the left image below)