77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
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#include <opencv2/core.hpp>
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#include <opencv2/videoio.hpp>
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#include <opencv2/highgui.hpp>
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#include <opencv2/imgproc.hpp> // cv::Canny()
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#include <iostream>
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using namespace cv;
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using std::cout; using std::cerr; using std::endl;
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int main(int, char**)
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{
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Mat frame;
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cout << "Opening camera..." << endl;
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VideoCapture capture(0); // open the first camera
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if (!capture.isOpened())
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{
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cerr << "ERROR: Can't initialize camera capture" << endl;
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return 1;
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}
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cout << "Frame width: " << capture.get(CAP_PROP_FRAME_WIDTH) << endl;
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cout << " height: " << capture.get(CAP_PROP_FRAME_HEIGHT) << endl;
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cout << "Capturing FPS: " << capture.get(CAP_PROP_FPS) << endl;
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cout << endl << "Press 'ESC' to quit, 'space' to toggle frame processing" << endl;
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cout << endl << "Start grabbing..." << endl;
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size_t nFrames = 0;
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bool enableProcessing = false;
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int64 t0 = cv::getTickCount();
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int64 processingTime = 0;
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for (;;)
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{
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capture >> frame; // read the next frame from camera
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if (frame.empty())
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{
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cerr << "ERROR: Can't grab camera frame." << endl;
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break;
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}
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nFrames++;
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if (nFrames % 10 == 0)
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{
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const int N = 10;
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int64 t1 = cv::getTickCount();
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cout << "Frames captured: " << cv::format("%5lld", (long long int)nFrames)
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<< " Average FPS: " << cv::format("%9.1f", (double)getTickFrequency() * N / (t1 - t0))
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<< " Average time per frame: " << cv::format("%9.2f ms", (double)(t1 - t0) * 1000.0f / (N * getTickFrequency()))
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<< " Average processing time: " << cv::format("%9.2f ms", (double)(processingTime) * 1000.0f / (N * getTickFrequency()))
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<< std::endl;
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t0 = t1;
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processingTime = 0;
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}
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if (!enableProcessing)
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{
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imshow("Frame", frame);
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}
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else
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{
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int64 tp0 = cv::getTickCount();
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Mat processed;
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cv::Canny(frame, processed, 400, 1000, 5);
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processingTime += cv::getTickCount() - tp0;
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imshow("Frame", processed);
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}
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int key = waitKey(1);
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if (key == 27/*ESC*/)
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break;
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if (key == 32/*SPACE*/)
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{
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enableProcessing = !enableProcessing;
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cout << "Enable frame processing ('space' key): " << enableProcessing << endl;
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}
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}
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std::cout << "Number of captured frames: " << nFrames << endl;
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return nFrames > 0 ? 0 : 1;
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}
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