When I use the OpenCV function findContours() my c++ application crashes. I've reproduced the error on both Windows 8.1 and Ubuntu. I've run into this crash before with the same function in my other OpenCV applications. Sometimes creating a new project and copying the exact same code resolves/avoids the error.
Below is the error message for both operating systems. Any advice what is going wrong?
Ubuntu Error:
> OpenCV Error: Assertion failed (mtype == type0 || (CV_MAT_CN(mtype) == CV_MAT_CN(type0) && ((1 << type0) & fixedDepthMask) != 0)) in create, file /home/me/opencv/modules/core/src/matrix.cpp, line 2383 terminate called after throwing an instance of 'cv::Exception' what(): /home/me/opencv/modules/core/src/matrix.cpp:2383: error: (-215) mtype == type0 || (CV_MAT_CN(mtype) == CV_MAT_CN(type0) && ((1 << type0) & fixedDepthMask) != 0) in function create
Windows 8.1 error:
The line of code causing the error has been commented below. Note both Mat objects are not null and of the same size (640x480). I am using OpenCV 3.0
void trackMovingObject(Mat& thresholdImg, Mat& cameraFeed)
{
std::vector> contours;
std::vector hierarchy;
// Crash occurs at below line
// thresholdImg is created from cv::threshold()
findContours(thresholdImg, contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);
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