/** * @function Remap_Demo.cpp * @brief Demo code for Remap * @author Ana Huaman */ #include "opencv2/imgcodecs.hpp" #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; const char* remap_window = "Remap demo"; int ind = 0; /// Function Headers void update_map( void ); /** * @function main */ int main( int, char** argv ) { /// Load the image src = imread( argv[1], 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, WINDOW_AUTOSIZE ); /// Loop for(;;) { /// 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, 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*0.25f ) + 0.5f ; map_y.at<float>(j,i) = 2*( j - src.rows*0.25f ) + 0.5f ; } else { map_x.at<float>(j,i) = 0 ; map_y.at<float>(j,i) = 0 ; } break; case 1: map_x.at<float>(j,i) = (float)i ; map_y.at<float>(j,i) = (float)(src.rows - j) ; break; case 2: map_x.at<float>(j,i) = (float)(src.cols - i) ; map_y.at<float>(j,i) = (float)j ; break; case 3: map_x.at<float>(j,i) = (float)(src.cols - i) ; map_y.at<float>(j,i) = (float)(src.rows - j) ; break; } // end of switch } } ind++; }