/* OpenCV Application Tracing support demo. */

#include <iostream>

#include <opencv2/core.hpp>

#include <opencv2/imgproc.hpp>

#include <opencv2/highgui.hpp>

#include <opencv2/videoio.hpp>

#include <opencv2/core/utils/trace.hpp>

using namespace cv;

using namespace std;

static void process_frame(const cv::UMat& frame)

{

CV_TRACE_FUNCTION(); // OpenCV Trace macro for function

imshow("Live", frame);

UMat gray, processed;

cv::cvtColor(frame, gray, COLOR_BGR2GRAY);

Canny(gray, processed, 32, 64, 3);

imshow("Processed", processed);

}

int main(int argc, char** argv)

{

CV_TRACE_FUNCTION();

cv::CommandLineParser parser(argc, argv,

"{help h ? | | help message}"

"{n | 100 | number of frames to process }"

"{@video | 0 | video filename or cameraID }"

);

if (parser.has("help"))

{

parser.printMessage();

return 0;

}

VideoCapture capture;

std::string video = parser.get<string>("@video");

if (video.size() == 1 && isdigit(video[0]))

capture.open(parser.get<int>("@video"));

else

capture.open(samples::findFileOrKeep(video)); // keep GStreamer pipelines

int nframes = 0;

if (capture.isOpened())

{

nframes = (int)capture.get(CAP_PROP_FRAME_COUNT);

cout << "Video " << video <<

": width=" << capture.get(CAP_PROP_FRAME_WIDTH) <<

", height=" << capture.get(CAP_PROP_FRAME_HEIGHT) <<

", nframes=" << nframes << endl;

}

else

{

cout << "Could not initialize video capturing...\n";

return -1;

}

int N = parser.get<int>("n");

if (nframes > 0 && N > nframes)

N = nframes;

cout << "Start processing..." << endl

<< "Press ESC key to terminate" << endl;

UMat frame;

for (int i = 0; N > 0 ? (i < N) : true; i++)

{

CV_TRACE_REGION("FRAME"); // OpenCV Trace macro for named "scope" region

{

CV_TRACE_REGION("read");

capture.read(frame);

if (frame.empty())

{

cerr << "Can't capture frame: " << i << std::endl;

break;

}

// OpenCV Trace macro for NEXT named region in the same C++ scope

// Previous "read" region will be marked complete on this line.

// Use this to eliminate unnecessary curly braces.

CV_TRACE_REGION_NEXT("process");

process_frame(frame);

CV_TRACE_REGION_NEXT("delay");

if (waitKey(1) == 27/*ESC*/)

break;

}

}

return 0;

}