OpenCV, cvRemap function has a weird unhandled exception

Asked Nov 19 '12 at 17:28

Active Nov 19 '12 at 17:51

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I was learning OpenCV to calibrate and rectify a camera. The camera is already calibrated and now I am using cvRemap(src, dst, mapx, mapy) to un-distort the two images taken by the left and right cameras.

Each time the program runs to the line containing cvRemap(), it throws an unhandled exception called:

Unhandled exception at 0x757dc41f in testagain.exe: Microsoft C++ exception: cv::Exception at memory location 0x003fe73c..

And the console says:

OpenCV Error: Assertion failed (src.type() == dst.type() && dst.size() == mapx.size()) in unknown function, file ..\ ..\ ..\src\opencv\modules\imgproc\src\imgwarp.cpp, line 3294

I did it according to Learning OpenCV. Note that the format of cvRemap is: cvRemap(const CvMat* src, const CvMat* dst, const CvMat* mapx, const CvMat* mapy). Some guesses here:

Since the mapx and mapy are generated by another program and read in by myself, there contain some negative values and some values larger than the resolution of picture(640*480), I manually processed these values and set them back to the range of resolution. I hope this won't be a problem.
Before this trial, I calculated mapx and mapy through cvInitUndistortRectifyMap(), and when I called cvRemap, there is no exception. I don't know why.

edited Nov 19 '12 at 17:51

KatieK

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asked Nov 19 '12 at 17:28

user1836485

Since mapx and mapy are generated by a different program, except for the values, do you make sure that `dst.size() == mapx.size()` as the error says? – Sassa Nov 19 '12 at 19:54
@Bob Yeah, the mapx is 640*480 same as the dst's size. – user1836485 Nov 19 '12 at 20:27
and they are the same type? not mixing int and uchar or float and double? – Hammer Nov 19 '12 at 23:50
@Hammer I checked it just now, they are both double. – user1836485 Nov 23 '12 at 22:27

OpenCV, cvRemap function has a weird unhandled exception

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