opencv/samples/cpp/laplace.cpp

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#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
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#include <ctype.h>
#include <stdio.h>
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#include <iostream>
using namespace cv;
using namespace std;
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static void help()
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{
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cout <<
"\nThis program demonstrates Laplace point/edge detection using OpenCV function Laplacian()\n"
"It captures from the camera of your choice: 0, 1, ... default 0\n"
"Call:\n"
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"./laplace -c=<camera #, default 0> -p=<index of the frame to be decoded/captured next>\n" << endl;
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}
enum {GAUSSIAN, BLUR, MEDIAN};
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int sigma = 3;
int smoothType = GAUSSIAN;
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int main( int argc, char** argv )
{
VideoCapture cap;
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cv::CommandLineParser parser(argc, argv, "{ c | 0 | }{ p | | }");
help();
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if( parser.get<string>("c").size() == 1 && isdigit(parser.get<string>("c")[0]) )
cap.open(parser.get<int>("c"));
else
cap.open(parser.get<string>("c"));
if( cap.isOpened() )
cout << "Video " << parser.get<string>("c") <<
": width=" << cap.get(CAP_PROP_FRAME_WIDTH) <<
", height=" << cap.get(CAP_PROP_FRAME_HEIGHT) <<
", nframes=" << cap.get(CAP_PROP_FRAME_COUNT) << endl;
if( parser.has("p") )
{
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int pos = parser.get<int>("p");
if (!parser.check())
{
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parser.printErrors();
return -1;
}
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cout << "seeking to frame #" << pos << endl;
cap.set(CAP_PROP_POS_FRAMES, pos);
}
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if( !cap.isOpened() )
{
cout << "Could not initialize capturing...\n";
return -1;
}
namedWindow( "Laplacian", 0 );
createTrackbar( "Sigma", "Laplacian", &sigma, 15, 0 );
Mat smoothed, laplace, result;
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for(;;)
{
Mat frame;
cap >> frame;
if( frame.empty() )
break;
int ksize = (sigma*5)|1;
if(smoothType == GAUSSIAN)
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GaussianBlur(frame, smoothed, Size(ksize, ksize), sigma, sigma);
else if(smoothType == BLUR)
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blur(frame, smoothed, Size(ksize, ksize));
else
medianBlur(frame, smoothed, ksize);
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Laplacian(smoothed, laplace, CV_16S, 5);
convertScaleAbs(laplace, result, (sigma+1)*0.25);
imshow("Laplacian", result);
char c = (char)waitKey(30);
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if( c == ' ' )
smoothType = smoothType == GAUSSIAN ? BLUR : smoothType == BLUR ? MEDIAN : GAUSSIAN;
if( c == 'q' || c == 'Q' || c == 27 )
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break;
}
return 0;
}