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OpenCV
4.2.0
Open Source Computer Vision
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An example using the cv::linearPolar and cv::logPolar operations
#include <iostream>
int main( int argc, char** argv )
{
Mat log_polar_img, lin_polar_img, recovered_log_polar, recovered_lin_polar_img;
CommandLineParser parser(argc, argv,
"{@input|0| camera device number or video file path}");
parser.
about(
"\nThis program illustrates usage of Linear-Polar and Log-Polar image transforms\n");
std::string arg = parser.
get<std::string>(
"@input");
if( arg.size() == 1 && isdigit(arg[0]) )
capture.
open( arg[0] -
'0' );
else
{
fprintf(stderr,"Could not initialize capturing...\n");
return -1;
}
for(;;)
{
capture >> src;
if(src.empty() )
break;
Point2f center( (
float)src.cols / 2, (
float)src.rows / 2 );
double maxRadius = 0.7*
min(center.
y, center.
x);
#if 0 //deprecated
double M = frame.cols /
log(maxRadius);
logPolar(frame, log_polar_img, center, M, flags);
linearPolar(frame, lin_polar_img, center, maxRadius, flags);
#endif
dst = log_polar_img;
else
dst = lin_polar_img;
int rho =
cvRound(dst.cols * 0.75);
double Kangle = dst.rows /
CV_2PI;
angleRad = phi / Kangle;
{
double Klog = dst.cols /
std::log(maxRadius);
}
else
{
double Klin = dst.cols / maxRadius;
}
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 );
break;
}
return 0;
}
void moveWindow(const String &winname, int x, int y)
Moves window to the specified position.
softdouble sin(const softdouble &a)
Sine.
T get(const String &name, bool space_delete=true) const
Access arguments by name.
Definition: utility.hpp:863
Class for video capturing from video files, image sequences or cameras.
Definition: videoio.hpp:608
int waitKey(int delay=0)
Waits for a pressed key.
_Tp y
y coordinate of the point
Definition: types.hpp:187
softfloat exp(const softfloat &a)
Exponent.
_Tp x
x coordinate of the point
Definition: types.hpp:186
#define CV_2PI
Definition: cvdef.h:327
softfloat min(const softfloat &a, const softfloat &b)
Min and Max functions.
Definition: softfloat.hpp:437
void namedWindow(const String &winname, int flags=WINDOW_AUTOSIZE)
Creates a window.
Size2i Size
Definition: types.hpp:347
softdouble cos(const softdouble &a)
Cosine.
MatSize size
Definition: mat.hpp:2108
void magnitude(InputArray x, InputArray y, OutputArray magnitude)
Calculates the magnitude of 2D vectors.
virtual bool isOpened() const
Returns true if video capturing has been initialized already.
int cvRound(double value)
Rounds floating-point number to the nearest integer.
Definition: fast_math.hpp:197
void imshow(const String &winname, InputArray mat)
Displays an image in the specified window.
Scalar_< double > Scalar
Definition: types.hpp:669
Point2i Point
Definition: types.hpp:194
n-dimensional dense array class
Definition: mat.hpp:791
cv::String findFileOrKeep(const cv::String &relative_path, bool silentMode=false)
Definition: utility.hpp:1164
void about(const String &message)
Set the about message.
Designed for command line parsing.
Definition: utility.hpp:796
"black box" representation of the file storage associated with a file on disk.
Definition: affine.hpp:51
void printMessage() const
Print help message.
the user cannot resize the window, the size is constrainted by the image displayed.
Definition: highgui.hpp:184
softfloat log(const softfloat &a)
Natural logarithm.
void drawMarker(InputOutputArray img, Point position, const Scalar &color, int markerType=MARKER_CROSS, int markerSize=20, int thickness=1, int line_type=8)
Draws a marker on a predefined position in an image.
virtual bool open(const String &filename, int apiPreference=CAP_ANY)
Opens a video file or a capturing device or an IP video stream for video capturing.