2.3使用指针遍历图像

#include"iostream"
using namespace std;
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
using namespace cv;

void colorReduce(Mat & image, int n=64 )
{
 int NL = image.rows;
 int NC = image.cols;
 int nc = NC * image.channels();
 for (int i = 0; i < NL; i++)
 {
  uchar *data = image.ptr<uchar>(i);
  for (int i = 0; i < nc; i++)
  {
   data[i] = data[i] % n*n + n / 2;
​//*data = *data%n*n + n / 2;
  }
 }
}
​int main()
{
 
 Mat image = imread("boldt.jpg");
 colorReduce(image);
 imshow("Image", image);
 system("pause");
 return 0;

}