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opencv imshow causing a memory leak (c++)

asked 2012-12-03 02:07:59 -0600

kaga gravatar image

updated 2012-12-03 06:56:20 -0600

I wrote this method (it displays an image):

void ImageLoader::displayMyImage()
imshow("new_window1", m_image);

m_image is of Mat type.

I also use this destructor:


However, Valgrind found tons of memory leaks. It's caused by these two cv functions: namedWindow and imshow (because without calling the displayMyImage() there is no any leak). Is there a way to fix it?

Edit: Here is the example code:

//Constructors (here I use only the first):
ImageLoader::ImageLoader(int width, int height)
    : m_image(width, height, CV_8UC3)


ImageLoader::ImageLoader(const string& fileName)
    : m_image(imread(fileName))
  if (!
    cout << "Failed loading " << fileName << endl;

//main ( where I call displayImage() ):
int main12(int argc, char **argv)
    ImageLoader img1("Lenna.png");
    return 0;

I'm sure it's the displayImage() method to cause memory leaks. Because it appears only when I call it.


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2 answers

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answered 2012-12-03 02:29:06 -0600

Daniil Osokin gravatar image

Hi! Did you setup a real test (e.g. call this method)? If no, this leak is spurious. Check the comment for this question.

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Yes, of course I've called displayMyImage() method. But what should I do in order to fix it?

kaga gravatar imagekaga ( 2012-12-03 02:46:04 -0600 )edit

Please, post the example code, where you call this. Can you try to invoke this method in a cycle and watch in system monitor the memory usage.

Daniil Osokin gravatar imageDaniil Osokin ( 2012-12-03 03:30:53 -0600 )edit

I'll do that. But can you tell me if the code is ok?

kaga gravatar imagekaga ( 2012-12-03 03:51:16 -0600 )edit

answered 2012-12-03 04:17:41 -0600

Vladislav Vinogradov gravatar image

namedWindow allocates some memory for inner structures. This memory will be freed when you close window or when you call destroyWindow / destroyAllWindows. Try to add destroyAllWindows to ImageLoaderer destructor.

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Asked: 2012-12-03 02:07:59 -0600

Seen: 4,136 times

Last updated: Dec 03 '12