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POUsing embeddedFrameCounter in the FlyCapture2 C++ API
 

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  1. POUsing embeddedFrameCounter in the FlyCapture2 C++ API
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    <p>I want to implement a framesafe capture with Point Grey Research cameras. To do that, I want to check if any frames have been missed by any cameras. The wrapper class that I am extending to do this is using the FlyCapture 2 API, so I would like to keep using that if possible.</p> <p>The <a href="http://www.ptgrey.com/support/kb/index.asp?a=4&amp;q=141" rel="nofollow">PGR FAQ on this question</a> only refers to the old API and IEEE-1394 cameras (the ones I use use USB 3.0). I am trying to use the frame counting functionality previously provided by uiSeqNum through the ImageMetadata object and its embeddedFrameCounter member. However, it always seems to be 0.</p> <p>I wonder if I am making a stupid mistake along the way or if it's a bug. In any case this code should run if you link the necessary files for OpenCV and Flycapture.</p> <pre><code>#include&lt;iostream&gt; #include"opencv2\opencv.hpp" #include"FlyCapture2.h" int main() { BusManager busMgr; PGRGuid guid; Camera cam; Image rawImage, convertedimage; busMgr.GetCameraFromIndex(0, &amp;guid); cam.Connect(&amp;guid); cam.SetVideoModeAndFrameRate(VIDEOMODE_640x480RGB,FRAMERATE_30); cam.StartCapture(); IplImage* src_img; while ((waitKey(30) &gt; 0) == false) { cam.RetrieveBuffer(&amp;rawImage); ImageMetadata metadata = rawImage.GetMetadata(); cout &lt;&lt; "framecount: " &lt;&lt; metadata.embeddedFrameCounter &lt;&lt; endl; rawImage.Convert(PIXEL_FORMAT_BGR, &amp;convertedimage); src_img = cvCreateImage(cvSize(rawImage.GetCols(),rawImage.GetRows()),IPL_DEPTH_8U,3); memcpy(src_img-&gt;imageData, convertedimage.GetData(), convertedimage.GetDataSize()); cvShowImage("Test", src_img); cvReleaseData(src_img) } waitKey(0); } </code></pre> <p>As an aside: tips on improving the memory management in this capture loop are appreciated.</p>
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    1. COIf you are using c++ and opencv use the c++ interface. The code will be nicer. Use Mat instead of IplImage and VideoCapture instead of Camera. Declear the varibles outside the loop to improve memory managment.
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    2. COI think I need to use the Camera class to get the metadata of the image. I'm unsure of how to use memcpy with Mat or if there's a more appropriate function. The loop was just careless copypasting for this snippet.
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    3. COI will accept my answer tomorrow, this is solved. Also fixed an embarrassing memory leak in the question's code.
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