opencv/modules/legacy/src/enteringblobdetectionreal.cpp

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/*
This file contain implementation of virtual interface of CvBlobDetector
this implementation based on simple algorithm
new blob is detected when several successive frames contains connected componets
which have uniform motion with not high speed.
Also separation from border and already tracked blobs are considered.
*/

#include "precomp.hpp"

/* blob detector  based on real data (groundtruth data)*/
class CvBlobDetectorReal:public CvBlobDetector
{
protected:
    CvTestSeq*      m_pTestSeq;
    CvBlobSeq       m_DetectedBlobs;
    CvMemStorage*   m_pMem;

public:
    CvBlobDetectorReal(CvTestSeq* pTestSeq)
    {
        m_pTestSeq = pTestSeq;
        m_pMem = cvCreateMemStorage(0);
        SetModuleName("Real");
    }

    /* Destructor of BlobDetector: */
   ~CvBlobDetectorReal()
    {
        if(m_pMem) cvReleaseMemStorage(&m_pMem);
    }   /* cvReleaseBlobDetector */

    /* cvDetectNewBlobs:
     * Return 1 and fill blob pNewBlob with
     * blob parameters if new blob is detected:
     */
    int DetectNewBlob(IplImage* /*pImg*/, IplImage* /*pFGMask*/, CvBlobSeq* pNewBlobList, CvBlobSeq* /*pOldBlobList*/)
    {
        int         i;
        int         TestObjNum;
        IplImage*   pMask = NULL;
        IplImage*   pMaskCopy = NULL;
        CvSeq*      cnts = NULL;

        if(m_pTestSeq==NULL) return 0;
        TestObjNum = cvTestSeqGetObjectNum(m_pTestSeq);
        pMask = cvTestSeqGetFGMask(m_pTestSeq);
        if(pMask == NULL) return 0;
        pMaskCopy = cvCloneImage(pMask);
        assert(pMaskCopy);

        cvClearMemStorage(m_pMem);
        cvFindContours( pMaskCopy, m_pMem, &cnts, sizeof(CvContour), CV_RETR_EXTERNAL);
        cvReleaseImage(&pMaskCopy);

        for(i=0; i<TestObjNum; ++i)
        {   /* Check each object: */
            CvPoint2D32f    RealPos;
            CvPoint2D32f    RealSize;
            int             RealPosFlag = cvTestSeqGetObjectPos(m_pTestSeq,i,&RealPos);
            int             RealSizeFlag = cvTestSeqGetObjectSize(m_pTestSeq,i,&RealSize);

            if(!RealPosFlag) continue;
            if(m_DetectedBlobs.GetBlobByID(i)) continue;

            if(RealSizeFlag)
            {   /* Real size is known: */
                float W2 = RealSize.x * 0.5f;
                float H2 = RealSize.y * 0.5f;
                if( RealPos.x > W2 && RealPos.x < (pMask->width-W2) &&
                    RealPos.y > H2 && RealPos.y < (pMask->height-H2) )
                {   /* Yes!!  We found new blob, let's add it to list: */
                    CvBlob  NewBlob;
                    NewBlob.x = RealPos.x;
                    NewBlob.y = RealPos.y;
                    NewBlob.w = RealSize.x;
                    NewBlob.h = RealSize.y;
                    NewBlob.ID = i;
                    m_DetectedBlobs.AddBlob(&NewBlob);
                    pNewBlobList->AddBlob(&NewBlob);
                }
            }   /* Real size is known. */
            else
            {
                CvSeq*  cnt;
                if(m_DetectedBlobs.GetBlobByID(i)) continue;

                for(cnt=cnts; cnt; cnt=cnt->h_next)
                {
                    //CvBlob* pNewBlob = NULL;
                    CvBlob  NewBlob;
                    CvRect  r = cvBoundingRect( cnt );
                    float   x = RealPos.x - r.x;
                    float   y = RealPos.y - r.y;

                    if(x<0 || x > r.width || y < 0 || y > r.height ) continue;

                    if( r.x <= 1 ||
                        r.y <= 1 ||
                        r.x + r.width >= pMask->width - 2 ||
                        r.y + r.height >= pMask->height - 2 ) continue;

                    /* Yes!!  We found new blob, let's add it to list: */
                    NewBlob.x = RealPos.x;
                    NewBlob.y = RealPos.y;
                    NewBlob.w = (float)r.width;
                    NewBlob.h = (float)r.height;
                    NewBlob.ID = i;
                    m_DetectedBlobs.AddBlob(&NewBlob);
                    pNewBlobList->AddBlob(&NewBlob);
                }
            }   /* Check new blob entrance. */
        }   /* Check next object. */

        return pNewBlobList->GetBlobNum();

    }   /* cvDetectNewBlob */

    void Release(){delete this;};
};

/* Blob detector constructor: */
CvBlobDetector* cvCreateBlobDetectorReal(CvTestSeq* pTestSeq){return new CvBlobDetectorReal(pTestSeq);}