opencv-2.4.13.zip

Blob Tracking Modules

Table of contents

Blob Tracking Modules...................................................................................................................1

Table of contents..........................................................................................................................1

General Description.....................................................................................................................1

Data structures description...........................................................................................................2

CvBlob.....................................................................................................................................2

CvBlobList...............................................................................................................................2

CvBlobTrackGen.....................................................................................................................5

CvBlobTrackPostProc.............................................................................................................6

CvBlobTrackPostProcList...................................................................................................6

CvBlobTrackPostProcOne...................................................................................................7

General Description

The blob tracking system includes 5 modules as depicted on diagram.

This pipeline is called “Blob Tracking Auto” module and implemented as individual module in

BlobTrackingAuto.cpp and BlobTrackingAuto.h files.

“FG/BG Detection” module performs foreground/background segmentation for each pixel.

“Blob Entering Detection” module uses the result (FG/BG mask) of “FG/BG Detection” module

module is optional and can not be included in specific pipeline.

The blob tracking system includes 4 modules as depicted on diagram.

Data structures description

CvBlob

It is a simple structure describing a blob position, size and ID.

typedef struct CvBlob

{

float x,y; /* blob position */

float w,h; /* blob sizes */

int ID; /* blbo ID */

}CvBlob;

public:

CvBlobSeq(int BlobSize = sizeof(CvBlob));

virtual ~CvBlobSeq();

virtual CvBlob* GetBlob(int BlobIndex);

virtual CvBlob* GetBlobByID(int BlobID);

virtual void DelBlob(int BlobIndex);

virtual void DelBlobByID(int BlobID);

virtual void Clear();

virtual void AddBlob(CvBlob* pB);

virtual int GetBlobNum();

The interface is defined in videomining\Surveillance\src\BG-FG-Estimation\PM\

BG_FG_Estimation.h file. If someone wants to create own module, he must create a class

inherited from CvFGDetector and implement all virtual methods declared in CvFGDetector.

Input Data:

Output Data:

FG/BG mask of current frame.

class CvFGDetector

{

public:

virtual IplImage* GetMask() = 0;

/* process current image */

virtual void Process(IplImage* pImg) = 0;

CvBlobDetector

This is virtual class, describing interface of “Blob Entering Detection” module.

The interface is defined in EnteringBlobDetection.h file. If someone wants to create own

module, he must create a class inherited from CvBlobDetector and implement all virtual methods

declared in CvBlobDetector.

Input Data:

FG/BG mask of current frame;

List of existed Blobs.

Output Data:

List of newly detected blobs.

/* pOldBlobList - pointer to blob list which already exist on image */

pOldBlobList) = 0;

/* return number of detected blobs */

/* release blob detector */

virtual void Release()=0;

};

This module detects new blob using FG mask. As result the newly detected blobs saved to

sequence of blob pNewBlobList. Also this module may use list of existing blobs pOldBlobList to

recognize actually new blob. All methods must be redefined in child class. Also some creation

function must be written.