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POhow cvCamShift works good
 

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  1. POhow cvCamShift works good
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    <p>i am trying to use cvCamShift function in opencv. i have written a class for doing this.this is it's code:</p> <pre><code>#include &lt;cv.h&gt; #include &lt;highgui.h&gt; using namespace std; class Tracker{ // File-level variables IplImage * pHSVImg; // the input image converted to HSV color mode IplImage * pHueImg; // the Hue channel of the HSV image IplImage * pMask; // this image is used for masking pixels IplImage * pProbImg; // the face probability estimates for each pixel CvHistogram * pHist; // histogram of hue in the original face image CvRect prevFaceRect; // location of face in previous frame CvBox2D faceBox; // current face-location estimate int vmin; int vmax; int smin; void updateHueImage(IplImage* pImg); public: Tracker(IplImage * pImg, CvRect pFaceRect); ~Tracker(); CvBox2d track(IplImage* pImg); }; Tracker::Tracker(IplImage * pImg, CvRect pFaceRect){ // File-level variables int nHistBins = 30; // number of histogram bins float rangesArr[] = {0,180}; // histogram range vmin = 10; vmax = 256; smin = 55; float * pRanges = rangesArr; pHSVImg = cvCreateImage( cvGetSize(pImg), 8, 3 ); pHueImg = cvCreateImage( cvGetSize(pImg), 8, 1 ); pMask = cvCreateImage( cvGetSize(pImg), 8, 1 ); pProbImg = cvCreateImage( cvGetSize(pImg), 8, 1 ); pHist = cvCreateHist( 1, &amp;nHistBins, CV_HIST_ARRAY, &amp;pRanges, 1 ); float maxVal = 0.f; // Create a new hue image updateHueImage(pImg); // Create a histogram representation for the face cvSetImageROI( pHueImg, pFaceRect ); cvSetImageROI( pMask, pFaceRect ); cvCalcHist( &amp;pHueImg, pHist, 0, pMask ); cvGetMinMaxHistValue( pHist, 0, &amp;maxVal, 0, 0 ); cvConvertScale( pHist-&gt;bins, pHist-&gt;bins, maxVal? 255.0/maxVal : 0, 0 ); cvResetImageROI( pHueImg ); cvResetImageROI( pMask ); // Store the previous face location prevFaceRect = pFaceRect; } Tracker::~Tracker(){ cvReleaseImage( &amp;pHSVImg ); cvReleaseImage( &amp;pHueImg ); cvReleaseImage( &amp;pMask ); cvReleaseImage( &amp;pProbImg ); cvReleaseHist( &amp;pHist ); } void Tracker::updateHueImage(IplImage * pImg) { // Convert to HSV color model cvCvtColor( pImg, pHSVImg, CV_BGR2HSV ); // Mask out-of-range values cvInRangeS( pHSVImg, cvScalar(0, smin, MIN(vmin,vmax), 0), cvScalar(180, 256, MAX(vmin,vmax) ,0), pMask ); // Extract the hue channel cvSplit( pHSVImg, pHueImg, 0, 0, 0 ); } CvBox2D Tracker::track(IplImage * pImg) { CvConnectedComp components; updateHueImage(pImg); cvCalcBackProject( &amp;pHueImg, pProbImg, pHist ); cvAnd( pProbImg, pMask, pProbImg, 0 ); cvCamShift( pProbImg, prevFaceRect, cvTermCriteria( CV_TERMCRIT_EPS | CV_TERMCRIT_ITER, 10, 1 ), &amp;components, &amp;faceBox ); prevFaceRect = components.rect; faceBox.angle = -faceBox.angle; return faceBox; } </code></pre> <p>it works good but when tracked object goes out of the frame or somthing comes front of it, it makes a runtime error. one of my friends has a code that it's very similar to my code and it doesn't make any runtime error even in the worst situations. please guide me how can i debug this.</p>
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