89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
#include "opencv2/videoio/videoio.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include "opencv2/imgproc/imgproc.hpp"
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#include <ctype.h>
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#include <stdio.h>
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#include <iostream>
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using namespace cv;
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using namespace std;
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static void help()
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{
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cout <<
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"\nThis program demonstrates Laplace point/edge detection using OpenCV function Laplacian()\n"
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"It captures from the camera of your choice: 0, 1, ... default 0\n"
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"Call:\n"
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"./laplace [camera #, default 0]\n" << endl;
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}
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enum {GAUSSIAN, BLUR, MEDIAN};
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int sigma = 3;
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int smoothType = GAUSSIAN;
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int main( int argc, char** argv )
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{
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VideoCapture cap;
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help();
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if( argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
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cap.open(argc == 2 ? argv[1][0] - '0' : 0);
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else if( argc >= 2 )
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{
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cap.open(argv[1]);
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if( cap.isOpened() )
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cout << "Video " << argv[1] <<
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": width=" << cap.get(CAP_PROP_FRAME_WIDTH) <<
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", height=" << cap.get(CAP_PROP_FRAME_HEIGHT) <<
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", nframes=" << cap.get(CAP_PROP_FRAME_COUNT) << endl;
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if( argc > 2 && isdigit(argv[2][0]) )
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{
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int pos;
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sscanf(argv[2], "%d", &pos);
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cout << "seeking to frame #" << pos << endl;
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cap.set(CAP_PROP_POS_FRAMES, pos);
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}
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}
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if( !cap.isOpened() )
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{
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cout << "Could not initialize capturing...\n";
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return -1;
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}
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namedWindow( "Laplacian", 0 );
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createTrackbar( "Sigma", "Laplacian", &sigma, 15, 0 );
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Mat smoothed, laplace, result;
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for(;;)
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{
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Mat frame;
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cap >> frame;
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if( frame.empty() )
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break;
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int ksize = (sigma*5)|1;
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if(smoothType == GAUSSIAN)
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GaussianBlur(frame, smoothed, Size(ksize, ksize), sigma, sigma);
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else if(smoothType == BLUR)
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blur(frame, smoothed, Size(ksize, ksize));
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else
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medianBlur(frame, smoothed, ksize);
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Laplacian(smoothed, laplace, CV_16S, 5);
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convertScaleAbs(laplace, result, (sigma+1)*0.25);
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imshow("Laplacian", result);
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int c = waitKey(30);
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if( c == ' ' )
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smoothType = smoothType == GAUSSIAN ? BLUR : smoothType == BLUR ? MEDIAN : GAUSSIAN;
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if( c == 'q' || c == 'Q' || (c & 255) == 27 )
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break;
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}
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return 0;
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}
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