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how to free memory through cv::Mat ?

asked 2013-05-30 07:33:15 -0500

mrgloom gravatar image
IplImage* src= cvLoadImage("1.tif");
        Mat m= src;//no copy
        Mat m1(src);//no copy
        m.release();//don't free mem
        m1.release();//don't free mem
        cvReleaseImage(&src);//free mem

how to free memory through cv::Mat ?

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Why would you wantt to do that?

Ben gravatar imageBen ( 2013-05-30 08:08:28 -0500 )edit

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answered 2013-05-30 08:05:52 -0500

Vladislav Vinogradov gravatar image

updated 2013-05-30 08:10:49 -0500

Use cv::imread, this function returns cv::Mat

Mat src = imread("1.tif");
src.release(); // free mem

cv::Mat will free memory only if it was allocated by create method (if Mat object owns this memory):

Mat src(100, 100, CV_32FC1);
src.release(); // will free memory

When you create Mat object from your pointer or from old C structs (CvMat, IplImage), Mat object will not free this memory.

float* data = new float[100 * 100];
Mat src(100, 100, CV_32FC1, data);
src.release(); // will not free memory
delete [] data;
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Yes, i have already understand it. But it's confusing when you create IplImage* and then use it with cv::Mat. Now I also use cv::Ptr<> to not to worry about cvReleaseImage.

mrgloom gravatar imagemrgloom ( 2013-05-31 00:58:03 -0500 )edit
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Asked: 2013-05-30 07:33:15 -0500

Seen: 63,078 times

Last updated: May 30 '13