Converting cv Mat to IplImage

Question

The documentation on this seems incredibly spotty    I ve basically got an empty array of IplImage s  IplImage   imageArray  and I m calling a function to import an array of cv  Mats - I want to convert my cv  Mat into an IplImage  so I can copy it into the array   Currently I m trying this   while loop over cv  Mat array        IplImage  xyz    amp  IplImage array i         cvCopy iplimagearray i   xyz       Which generates a segfault   Also trying   while loop over cv  Mat array        IplImage  xyz      xyz    amp array i       cvCopy iplimagearray i   xyz       Which gives me a compile time error of  error  cannot convert    cv  Mat     to    IplImage     in assignment  Stuck as to how I can go further and would appreciate some advice

User · Answer

Here is the recent fix for dlib users link      cv  Mat img       IplImage iplImage   cvIplImage img

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Mat image1  IplImage  image2 cvCloneImage  amp  IplImage image1     Guess this will do the job   Edit  If you face compilation errors  try this way   cv  Mat image1  IplImage  image2  image2   cvCreateImage cvSize image1 cols image1 rows  8 3   IplImage ipltemp image1  cvCopy  amp ipltemp image2

User · Answer

cv  Mat is the new type introduce in OpenCV2 X while the IplImage  is the  legacy  image structure    Although  cv  Mat does support the usage of IplImage in the constructor parameters  the default library does not provide function for the other way  You will need to extract the image header information manually   Do remember that you need to allocate the IplImage structure  which is lack in your example

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One problem might be  when using external ipl and defining HAVE IPL in your project  the ctor    IplImage   IplImage const cv  Mat amp  m        CV Assert  m dims  lt   2        cvInitImageHeader this  m size    cvIplDepth m flags   m channels         cvSetData this  m data   int m step 0        found in    OpenCV modules core src matrix cpp is not used instanciated and conversion fails   You may reimplement it in a way similar to    IplImage amp  FromMat IplImage amp  img  const cv  Mat amp  m        CV Assert m dims  lt   2       cvInitImageHeader  amp img  m size    cvIplDepth m flags   m channels         cvSetData  amp img  m data   int m step 0        return img     IplImage img  FromMat img myMat

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you have cv  Mat old   IplImage copy   old   IplImage  new image    amp copy    you work with new as an originally declared IplImage

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In case of gray image  I am using this function and it works fine  however you must take care about the function features     CvMat   src   cvCreateMat 300 300 CV 32FC1         IplImage  dist  cvCreateImage cvGetSize dist  IPL DEPTH 32F 3    cvConvertScale src  dist  1  0

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Personaly I think it s not the problem caused by type casting but a buffer overflow problem  it is this line   cvCopy iplimagearray i   xyz        that I think will cause segment fault  I suggest that you confirm the array iplimagearray i  have enough size of buffer to receive copyed data

User · Answer

According to OpenCV cheat-sheet this can be done as follows   IplImage  oldC0   cvCreateImage cvSize 320 240  16 1   Mat newC   cvarrToMat oldC0     The cv  cvarrToMat function takes care of the conversion issues

[c++] Converting cv::Mat to IplImage*

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