| OpenCV 3.4.1 Open Source Computer Vision

polar_transforms.cpp

An example using the cv::linearPolar and cv::logPolar operations

#include "opencv2/imgproc.hpp"
#include "opencv2/highgui.hpp"
#include <iostream>
using namespace cv;
static void help( void )
{
printf("\nThis program illustrates Linear-Polar and Log-Polar image transforms\n"
"Usage :\n"
"./polar_transforms [[camera number -- Default 0],[path_to_filename]]\n\n");
}
int main( int argc, char** argv )
{
VideoCapture capture;
Mat log_polar_img, lin_polar_img, recovered_log_polar, recovered_lin_polar_img;
help();
CommandLineParser parser(argc, argv, "{@input|0|}");
std::string arg = parser.get<std::string>("@input");
if( arg.size() == 1 && isdigit(arg[0]) )
capture.open( arg[0] - '0' );
else
capture.open( arg.c_str() );
if( !capture.isOpened() )
{
const char* name = argv[0];
fprintf(stderr,"Could not initialize capturing...\n");
fprintf(stderr,"Usage: %s <CAMERA_NUMBER> , or \n %s <VIDEO_FILE>\n", name, name);
return -1;
}
namedWindow( "Linear-Polar", WINDOW_AUTOSIZE );
namedWindow( "Log-Polar", WINDOW_AUTOSIZE);
namedWindow( "Recovered Linear-Polar", WINDOW_AUTOSIZE);
namedWindow( "Recovered Log-Polar", WINDOW_AUTOSIZE);
moveWindow( "Linear-Polar", 20,20 );
moveWindow( "Log-Polar", 700,20 );
moveWindow( "Recovered Linear-Polar", 20, 350 );
moveWindow( "Recovered Log-Polar", 700, 350 );
for(;;)
{
Mat frame;
capture >> frame;
if( frame.empty() )
break;
Point2f center( (float)frame.cols / 2, (float)frame.rows / 2 );
double M = 70;
logPolar(frame,log_polar_img, center, M, INTER_LINEAR + WARP_FILL_OUTLIERS);
linearPolar(frame,lin_polar_img, center, M, INTER_LINEAR + WARP_FILL_OUTLIERS);
logPolar(log_polar_img, recovered_log_polar, center, M, WARP_INVERSE_MAP + INTER_LINEAR);
linearPolar(lin_polar_img, recovered_lin_polar_img, center, M, WARP_INVERSE_MAP + INTER_LINEAR + WARP_FILL_OUTLIERS);
imshow("Log-Polar", log_polar_img );
imshow("Linear-Polar", lin_polar_img );
imshow("Recovered Linear-Polar", recovered_lin_polar_img );
imshow("Recovered Log-Polar", recovered_log_polar );
if( waitKey(10) >= 0 )
break;
}
waitKey(0);
return 0;
}