opencv中的Remap函数可以使一幅图像以一定的方式映射到另外一幅图像。
具体代码如下:
#include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include <iostream> #include <stdio.h> using namespace cv; /// Global variables Mat src, dst; Mat map_x, map_y; char* remap_window = "Remap demo"; int ind = 0; /// Function Headers void update_map( void ); /** * @function main */ int main( int argc, char** argv ) { /// Load the image src = imread( "12.jpg", 1 ); /// Create dst, map_x and map_y with the same size as src: dst.create( src.size(), src.type() ); map_x.create( src.size(), CV_32FC1 ); map_y.create( src.size(), CV_32FC1 ); /// Create window namedWindow( remap_window, CV_WINDOW_AUTOSIZE ); /// Loop while( true ) { /// Each 1 sec. Press ESC to exit the program int c = waitKey( 1000 ); if( (char)c == 27 ) { break; } /// Update map_x & map_y. Then apply remap update_map(); remap( src, dst, map_x, map_y, CV_INTER_LINEAR, BORDER_CONSTANT, Scalar(0,0, 0) ); /// Display results imshow( remap_window, dst ); } return 0; } /** * @function update_map * @brief Fill the map_x and map_y matrices with 4 types of mappings */ void update_map( void ) { ind = ind%4; for( int j = 0; j < src.rows; j++ ) { for( int i = 0; i < src.cols; i++ ) { switch( ind ) { case 0: if( i > src.cols*0.25 && i < src.cols*0.75 && j > src.rows*0.25 && j < src.rows*0.75 ) {map_x.at<float>(j,i) = 2*( i - src.cols*0.25 ) + 0.5 ; map_y.at<float>(j,i) = 2*( j - src.rows*0.25 ) + 0.5 ; } else { map_x.at<float>(j,i) = 0 ; map_y.at<float>(j,i) = 0 ; } break; case 1: map_x.at<float>(j,i) = i ; map_y.at<float>(j,i) = src.rows - j ; break; case 2: map_x.at<float>(j,i) = src.cols - i ; map_y.at<float>(j,i) = j ; break; case 3: map_x.at<float>(j,i) = src.cols - i ; map_y.at<float>(j,i) = src.rows - j ; break; } // end of switch } } ind++; }