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/**
* @function Remap_Demo.cpp
* @brief Demo code for Remap
* @author Ana Huaman
*/
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include <iostream>
using namespace cv;
/// Function Headers
void update_map( int &ind, Mat &map_x, Mat &map_y );
/**
* @function main
*/
int main(int argc, const char** argv)
{
CommandLineParser parser(argc, argv, "{@image |chicky_512.png|input image name}");
std::string filename = parser.get<std::string>(0);
//! [Load]
/// Load the image
Mat src = imread( samples::findFile( filename ), IMREAD_COLOR );
if (src.empty())
{
std::cout << "Cannot read image: " << filename << std::endl;
return -1;
}
//! [Load]
//! [Create]
/// Create dst, map_x and map_y with the same size as src:
Mat dst(src.size(), src.type());
Mat map_x(src.size(), CV_32FC1);
Mat map_y(src.size(), CV_32FC1);
//! [Create]
//! [Window]
/// Create window
const char* remap_window = "Remap demo";
namedWindow( remap_window, WINDOW_AUTOSIZE );
//! [Window]
//! [Loop]
/// Index to switch between the remap modes
int ind = 0;
for(;;)
{
/// Update map_x & map_y. Then apply remap
update_map(ind, map_x, map_y);
remap( src, dst, map_x, map_y, INTER_LINEAR, BORDER_CONSTANT, Scalar(0, 0, 0) );
/// Display results
imshow( remap_window, dst );
/// Each 1 sec. Press ESC to exit the program
char c = (char)waitKey( 1000 );
if( c == 27 )
{
break;
}
}
//! [Loop]
return 0;
}
/**
* @function update_map
* @brief Fill the map_x and map_y matrices with 4 types of mappings
*/
//! [Update]
void update_map( int &ind, Mat &map_x, Mat &map_y )
{
for( int i = 0; i < map_x.rows; i++ )
{
for( int j = 0; j < map_x.cols; j++ )
{
switch( ind )
{
case 0:
if( j > map_x.cols*0.25 && j < map_x.cols*0.75 && i > map_x.rows*0.25 && i < map_x.rows*0.75 )
{
map_x.at<float>(i, j) = 2*( j - map_x.cols*0.25f ) + 0.5f;
map_y.at<float>(i, j) = 2*( i - map_x.rows*0.25f ) + 0.5f;
}
else
{
map_x.at<float>(i, j) = 0;
map_y.at<float>(i, j) = 0;
}
break;
case 1:
map_x.at<float>(i, j) = (float)j;
map_y.at<float>(i, j) = (float)(map_x.rows - i);
break;
case 2:
map_x.at<float>(i, j) = (float)(map_x.cols - j);
map_y.at<float>(i, j) = (float)i;
break;
case 3:
map_x.at<float>(i, j) = (float)(map_x.cols - j);
map_y.at<float>(i, j) = (float)(map_x.rows - i);
break;
default:
break;
} // end of switch
}
}
ind = (ind+1) % 4;
}
//! [Update]
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