HEAP; corruption or bug when detect face using cascade classifier

edit

just a blind guess:

"I convert data from buffer into Mat" - you have to be careful here, the Mat just does a shallow copy of the data pointer, once that goes out of scope (e.g. if you have some kind of callback function), it is dead.

try like this:

   Mat  m1(h,w,type, pointer); // shallow copy only !!
   Mat frame = m1.clone(); // our own copy of the data !
   // ... use frame..

I did that part, but it does not solve my problem sir.

The cause - of a heap corruption in particular - can be extremely hard to find. My suggestion is that you start building a minimum example that crashes and one that does not crash. This doesn't mean the one that doesn't crash doesn't have the error. But at least you have a small piece of code you can debug/inspect and possibly post here.

please append code to question.

I had appended the code just now. Hope there is a solution.

Nope. That's not me. Oh, but it my first time heard about 'nifty format' or '.nii'.

^^ sorry, my bad, i confused nii and ni images, ignore !

hmm, staring hard at the code, and the {} braces do not match. is this really all of the code ?

(stráy } before the imshow())

Ugh.. sorry. I'd edited the code. There is no } before imshow().