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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);
66 /* Destructor of BlobDetector: */
69 if(m_pMem) cvReleaseMemStorage(&m_pMem);
70 } /* cvReleaseBlobDetector */
73 * Return 1 and fill blob pNewBlob with
74 * blob parameters if new blob is detected:
76 int DetectNewBlob(IplImage* /*pImg*/, IplImage* /*pFGMask*/, CvBlobSeq* pNewBlobList, CvBlobSeq* /*pOldBlobList*/)
80 IplImage* pMask = NULL;
81 IplImage* pMaskCopy = NULL;
84 if(m_pTestSeq==NULL) return 0;
85 TestObjNum = cvTestSeqGetObjectNum(m_pTestSeq);
86 pMask = cvTestSeqGetFGMask(m_pTestSeq);
87 if(pMask == NULL) return 0;
88 pMaskCopy = cvCloneImage(pMask);
91 cvClearMemStorage(m_pMem);
92 cvFindContours( pMaskCopy, m_pMem, &cnts, sizeof(CvContour), CV_RETR_EXTERNAL);
93 cvReleaseImage(&pMaskCopy);
95 for(i=0; i<TestObjNum; ++i)
96 { /* Check each object: */
98 CvPoint2D32f RealSize;
99 int RealPosFlag = cvTestSeqGetObjectPos(m_pTestSeq,i,&RealPos);
100 int RealSizeFlag = cvTestSeqGetObjectSize(m_pTestSeq,i,&RealSize);
102 if(!RealPosFlag) continue;
103 if(m_DetectedBlobs.GetBlobByID(i)) continue;
106 { /* Real size is known: */
107 float W2 = RealSize.x * 0.5f;
108 float H2 = RealSize.y * 0.5f;
109 if( RealPos.x > W2 && RealPos.x < (pMask->width-W2) &&
110 RealPos.y > H2 && RealPos.y < (pMask->height-H2) )
111 { /* Yes!! We found new blob, let's add it to list: */
113 NewBlob.x = RealPos.x;
114 NewBlob.y = RealPos.y;
115 NewBlob.w = RealSize.x;
116 NewBlob.h = RealSize.y;
118 m_DetectedBlobs.AddBlob(&NewBlob);
119 pNewBlobList->AddBlob(&NewBlob);
121 } /* Real size is known. */
125 if(m_DetectedBlobs.GetBlobByID(i)) continue;
127 for(cnt=cnts; cnt; cnt=cnt->h_next)
129 //CvBlob* pNewBlob = NULL;
131 CvRect r = cvBoundingRect( cnt );
132 float x = RealPos.x - r.x;
133 float y = RealPos.y - r.y;
135 if(x<0 || x > r.width || y < 0 || y > r.height ) continue;
139 r.x + r.width >= pMask->width - 2 ||
140 r.y + r.height >= pMask->height - 2 ) continue;
142 /* Yes!! We found new blob, let's add it to list: */
143 NewBlob.x = RealPos.x;
144 NewBlob.y = RealPos.y;
145 NewBlob.w = (float)r.width;
146 NewBlob.h = (float)r.height;
148 m_DetectedBlobs.AddBlob(&NewBlob);
149 pNewBlobList->AddBlob(&NewBlob);
151 } /* Check new blob entrance. */
152 } /* Check next object. */
154 return pNewBlobList->GetBlobNum();
156 } /* cvDetectNewBlob */
158 void Release(){delete this;};
161 /* Blob detector constructor: */
162 CvBlobDetector* cvCreateBlobDetectorReal(CvTestSeq* pTestSeq){return new CvBlobDetectorReal(pTestSeq);}