将CalcOpticalFlowPyrLK与OpenCV 2.3.1结合使用时出错

Question

I am trying to use calcOpticalFlowPyrLK for feature tracking. Function is used as follows

TermCriteria termcrit(CV_TERMCRIT_ITER|CV_TERMCRIT_EPS,20,0.03);

Size winSize(31,31);

vector < uchar > status;

vector < float > err;

calcOpticalFlowPyrLK(prevGray, gray, point[0], point[1], status, err, winSize, 3, termcrit, 0, 0, 0.001);

All the parameter are correct. In point[0] there are already given set of points. But while i try to execute the program it gives following error. I am using Visual C++ 2010.

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First-chance exception at 0x74c426df (msvcr100.dll) in GFFER.exe: 0xC0000005: Access violation writing location 0x058fe000. Unhandled exception at 0x74c426df (msvcr100.dll) in GFFER.exe: 0xC0000005: Access violation writing location 0x058fe000.

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Do you have any idea how can i resolve this problem.

Thanks in advance!!

Answer 1

Access violation writing location

The error seems to occur when writing data to a location which is not initialized. In your code, point[1] , status and err are the only locations where a write occurs.

status and err and defined correctly. The problem must be with point[1] . Is it of the type vector<Point2f> .

Why don't you try using two separate vectors instead of an array of vectors, say, point0 point1.