OpenCV access elements by pointer
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OpenCV access elements by pointer
#include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <iostream> using namespace std;using namespace cv;void colorReduce(Mat& inputImage, Mat& outputImage, int div);int main() {Mat srcImage = imread("1.JPG");imshow("原始图像", srcImage);Mat dstImage;dstImage.create(srcImage.rows, srcImage.cols, srcImage.type());double time0 = static_cast<double>(getTickCount());colorReduce(srcImage, dstImage, 32);time0 = ((double)getTickCount() - time0) / getTickFrequency();cout << "此方法的时间为" << time0 << "秒" << endl; imshow("效果图", dstImage);waitKey(0);}void colorReduce(Mat& inputImage, Mat& outputImage, int div) {outputImage = inputImage.clone();int rowNumber = outputImage.rows;int colNumber = outputImage.cols * outputImage.channels();for (int i = 0;i < rowNumber; i++) {uchar* data = outputImage.ptr<uchar>(i);for (int j = 0;j < colNumber;j++) {data[j] = data[j] / div * div + div / 2;}}}
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