Opencv用指针访问像素

#include<iostream>
#include<opencv2/opencv.hpp>
#include<vector>

using namespace std;
using namespace cv;

void colorReduce(const Mat &srcImage, Mat &dstImage, int div);

int main()
{
	Mat srcImage = imread("G:\\group.jpg");

	Mat dstImage;
	dstImage.create(srcImage.size(), srcImage.type());

	colorReduce(srcImage, dstImage, 64);

	imshow("【原图】", srcImage);
	imshow("【颜色减缩图】", dstImage);

	waitKey(0);

	return 0;
}

void colorReduce(const Mat &srcImage, Mat &dstImage, int div)
{
	srcImage.copyTo(dstImage);
	int rows = dstImage.rows;
	int cols = dstImage.cols * dstImage.channels();
	for (int i = 0; i < rows; i++)
	{
		uchar *data = dstImage.ptr<uchar>(i);
		for (int j = 0; j < cols; j++)
		{
			data[j] = data[j] / div * div + div / 2;
		}
	}
}