OpenCV之重映射_opencv 点映射

重映射的概念

实现重映射:remap函数

代码示例

 
#include <iostream>
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/video.hpp>
 
using namespace cv;
using namespace std;
 
int main(int argc, char** argv)
{
	//0.变量定义
	Mat srcImage, dstImage;
	Mat map_x, map_y;
 
	//1.载入原始图
	srcImage = imread("700levi.jpg");
	imshow("原始图", srcImage);
 
	//2.创建和原始图一样的效果图, x重映射图, y重映射图
	dstImage.create(srcImage.size(), srcImage.type());
	map_x.create(srcImage.size(), CV_32FC1);
	map_y.create(srcImage.size(), CV_32FC1);
 
	//3.双层循环 遍历每一个像素点, 改变map_x和map_y的值
	for (int i = 0; i < srcImage.rows; i++)
	{
		for (int j = 0; j < srcImage.cols; j++) {
			//改变map_x 和 map_y的值
			map_x.at<float>(i, j) = static_cast<float>(j);
			map_y.at<float>(i, j) = static_cast<float>(srcImage.rows-i);
		}
	}
 
	//4.进行重映射操作
	remap(srcImage, dstImage, map_x, map_y, INTER_LINEAR);
 
	//5.显示效果图
	imshow("程序窗口", dstImage);
 
	waitKey(0);
	return 0;
}

效果