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42 This file contain implementation of virtual interface of CvBlobDetector
43 this implementation based on simple algorithm
44 new blob is detected when several successive frames contains connected componets
45 which have uniform motion with not high speed.
46 Also separation from border and already tracked blobs are considered.
51 /* blob detector based on real data (groundtruth data)*/
52 class CvBlobDetectorReal:public CvBlobDetector
55 CvTestSeq* m_pTestSeq;
56 CvBlobSeq m_DetectedBlobs;
60 CvBlobDetectorReal(CvTestSeq* pTestSeq)
62 m_pTestSeq = pTestSeq;
63 m_pMem = cvCreateMemStorage(0);
64 SetModuleName("Real");
67 /* Destructor of BlobDetector: */
70 if(m_pMem) cvReleaseMemStorage(&m_pMem);
71 } /* cvReleaseBlobDetector */
74 * Return 1 and fill blob pNewBlob with
75 * blob parameters if new blob is detected:
77 int DetectNewBlob(IplImage* /*pImg*/, IplImage* /*pFGMask*/, CvBlobSeq* pNewBlobList, CvBlobSeq* /*pOldBlobList*/)
81 IplImage* pMask = NULL;
82 IplImage* pMaskCopy = NULL;
85 if(m_pTestSeq==NULL) return 0;
86 TestObjNum = cvTestSeqGetObjectNum(m_pTestSeq);
87 pMask = cvTestSeqGetFGMask(m_pTestSeq);
88 if(pMask == NULL) return 0;
89 pMaskCopy = cvCloneImage(pMask);
92 cvClearMemStorage(m_pMem);
93 cvFindContours( pMaskCopy, m_pMem, &cnts, sizeof(CvContour), CV_RETR_EXTERNAL);
94 cvReleaseImage(&pMaskCopy);
96 for(i=0; i<TestObjNum; ++i)
97 { /* Check each object: */
99 CvPoint2D32f RealSize;
100 int RealPosFlag = cvTestSeqGetObjectPos(m_pTestSeq,i,&RealPos);
101 int RealSizeFlag = cvTestSeqGetObjectSize(m_pTestSeq,i,&RealSize);
103 if(!RealPosFlag) continue;
104 if(m_DetectedBlobs.GetBlobByID(i)) continue;
107 { /* Real size is known: */
108 float W2 = RealSize.x * 0.5f;
109 float H2 = RealSize.y * 0.5f;
110 if( RealPos.x > W2 && RealPos.x < (pMask->width-W2) &&
111 RealPos.y > H2 && RealPos.y < (pMask->height-H2) )
112 { /* Yes!! We found new blob, let's add it to list: */
114 NewBlob.x = RealPos.x;
115 NewBlob.y = RealPos.y;
116 NewBlob.w = RealSize.x;
117 NewBlob.h = RealSize.y;
119 m_DetectedBlobs.AddBlob(&NewBlob);
120 pNewBlobList->AddBlob(&NewBlob);
122 } /* Real size is known. */
126 if(m_DetectedBlobs.GetBlobByID(i)) continue;
128 for(cnt=cnts; cnt; cnt=cnt->h_next)
130 //CvBlob* pNewBlob = NULL;
132 CvRect r = cvBoundingRect( cnt );
133 float x = RealPos.x - r.x;
134 float y = RealPos.y - r.y;
136 if(x<0 || x > r.width || y < 0 || y > r.height ) continue;
140 r.x + r.width >= pMask->width - 2 ||
141 r.y + r.height >= pMask->height - 2 ) continue;
143 /* Yes!! We found new blob, let's add it to list: */
144 NewBlob.x = RealPos.x;
145 NewBlob.y = RealPos.y;
146 NewBlob.w = (float)r.width;
147 NewBlob.h = (float)r.height;
149 m_DetectedBlobs.AddBlob(&NewBlob);
150 pNewBlobList->AddBlob(&NewBlob);
152 } /* Check new blob entrance. */
153 } /* Check next object. */
155 return pNewBlobList->GetBlobNum();
157 } /* cvDetectNewBlob */
159 void Release(){delete this;};
162 /* Blob detector constructor: */
163 CvBlobDetector* cvCreateBlobDetectorReal(CvTestSeq* pTestSeq){return new CvBlobDetectorReal(pTestSeq);}