Hello,

I am using the x86 machine doing embedded development which requires recording the images of the cameras. I am using the library OpenCV 2.4 for image operations. Specifically, the "imwrite()" function is used to save as the jpeg images. The executable program got a segmentation fault error randomly during the capture process. Attached is the debug screenshot when the error happened. Wondering if "Address 0xxxxx out of bounds" is causing the problem. But there are several times the error still happens without this hint. Can please suggest some ways of debugging this problem. Thank you.

Eric

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That can be difficult if you aren't an experienced programmer, since apparently this isn't your code.

In the failure you showed, bgra is a pointer that points to an invalid address. You didn't show enough info for me to see why bgra points to an invalid address.

Most likely, the variable i at the point of failure is non zero, from which you could deduce that size.width is too large and the loop has incremented bgra from a valid pointer to an invalid one.

If i were zero then bgra must have been invalid before that section of code started.

It is reasonably to assume the code from opencv is correct and your code contains the error. So there must be something wrong with the InputArray you passed to imwrite().

Dear John,

Yes, the problem is probably on my side with the images I put into. But I have checked that the input images which has a resolution 640 x 480 data. So could you suggest a way to thoroughly check the InputArray? Thanks a lot.

Regards,
Eric

The problem is already solved. It is a mutex issue which causes the OpenCV error when accesing the Mat structure.

Thanks,
Eric