[OpenCV] RGB Histogram Equalization

RGB Histogram Equalization

Reference: StackOverflow
Grayscale method: Official DOC

	#include <stdio.h>
	#include <iostream>
	#include <opencv2/opencv.hpp>
	#include <opencv2/highgui/highgui.hpp>
	using namespace cv;
	using namespace std;
	/** @function main */
	Mat equalizeIntensity(const Mat& inputImage)
	{
	if (inputImage.channels() >= 3)
	{
	Mat ycrcb;
	cvtColor(inputImage, ycrcb, CV_BGR2YCrCb);
	vector<Mat> channels;
	split(ycrcb, channels);
	equalizeHist(channels[0], channels[0]);
	Mat result;
	merge(channels, ycrcb);
	cvtColor(ycrcb, result, CV_YCrCb2BGR);
	return result;
	}
	return Mat();
	}
	int main(int argc, char** argv)
	{
	Mat src, dst;
	/// Load image
	src = imread("C:/img/Fig0635(bottom_left_stream).tif");
	Mat src2 = src.clone();
	if (!src.data)
	{
	cout << "Usage: ./Histogram_Demo <path_to_image>" << endl;
	return -1;
	}
	src = equalizeIntensity(src);
	imshow("before", src2);
	imshow("after", src);
	/// Wait until user exits the program
	waitKey(0);
	return 0;
	}

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