99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
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#include "opencv2/videoio.hpp"
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#include "opencv2/highgui.hpp"
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#include "opencv2/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(char** argv)
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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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<< argv[0] << " -c=<camera #, default 0> -p=<index of the frame to be decoded/captured next>\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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cv::CommandLineParser parser(argc, argv, "{ c | 0 | }{ p | | }");
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help(argv);
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VideoCapture cap;
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string camera = parser.get<string>("c");
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if (camera.size() == 1 && isdigit(camera[0]))
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cap.open(parser.get<int>("c"));
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else
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cap.open(samples::findFileOrKeep(camera));
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if (!cap.isOpened())
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{
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cerr << "Can't open camera/video stream: " << camera << endl;
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return 1;
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}
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cout << "Video " << parser.get<string>("c") <<
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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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int pos = 0;
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if (parser.has("p"))
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{
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pos = parser.get<int>("p");
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}
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if (!parser.check())
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{
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parser.printErrors();
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return -1;
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}
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if (pos != 0)
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{
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cout << "seeking to frame #" << pos << endl;
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if (!cap.set(CAP_PROP_POS_FRAMES, pos))
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{
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cerr << "ERROR: seekeing is not supported" << endl;
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}
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}
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namedWindow("Laplacian", WINDOW_AUTOSIZE);
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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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char c = (char)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 == 27 )
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break;
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}
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return 0;
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}
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