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This commit is contained in:
Gary Bradski 2010-12-03 10:38:43 +00:00
parent 37ae2634aa
commit 6eb0fc6e2d
1 changed files with 11 additions and 3 deletions
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14
samples/cpp/dft.cpp
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@ -3,9 +3,17 @@
#include <opencv2/highgui/highgui.hpp> #include <opencv2/highgui/highgui.hpp>
#include <iostream> #include <iostream>
using namespace cv; using namespace cv;
using namespace std; using namespace std;
void help()
{
cout << "\nThis program demonstrated the use of the discrete Fourier transform (dft)\n"
"The dft of an image is taken and it's power spectrum is displayed.\n"
"Call:\n"
"./dft [image_name -- default lena.jpg]\n" << endl;
}
int main(int argc, char ** argv) int main(int argc, char ** argv)
{ {
@ -14,10 +22,10 @@ int main(int argc, char ** argv)
Mat img = imread(filename, CV_LOAD_IMAGE_GRAYSCALE); Mat img = imread(filename, CV_LOAD_IMAGE_GRAYSCALE);
if( img.empty() ) if( img.empty() )
{ {
cout << "Usage: dft <image_name>" << endl; help();
return -1; return -1;
} }
help();
int M = getOptimalDFTSize( img.rows ); int M = getOptimalDFTSize( img.rows );
int N = getOptimalDFTSize( img.cols ); int N = getOptimalDFTSize( img.cols );
Mat padded; Mat padded;