crash in Mat::release()

asked 2020-09-30 07:37:59 -0500

Dudi gravatar image

updated 2020-09-30 19:18:00 -0500

Hi, I have a function that creates a histogram:

double median_(const cv::Mat& channel)
{
    double m = (channel.rows*channel.cols) / 2;
    int bin = 0;
    double med = -1.0;

    int histSize = 256;
    float range[] = { 0, 256 };
    const float* histRange = { range };
    bool uniform = true;
    bool accumulate = false;
    cv::Mat hist;
    cv::calcHist(&channel, 1, 0, cv::Mat(), hist, 1, &histSize, &histRange, uniform, accumulate);

    for (int i = 0; i < histSize && med < 0.0; ++i)
    {
        bin += cvRound(hist.at< float >(i));
        if (bin > m && med < 0.0)
            med = i;
    }

    hist.release();
    return med;
}

Calling hist.release() is crashing. Can someone help please?

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Comments

Do not call release(), let it go out of scope.

Der Luftmensch gravatar imageDer Luftmensch ( 2020-09-30 19:20:28 -0500 )edit

Why do you put & in front of channel argument? There is usually no reason to pass cv::Mat pointers.

Der Luftmensch gravatar imageDer Luftmensch ( 2020-10-01 11:36:14 -0500 )edit

Hi Der, thanks for your reply... Ignore the sample above and check the simple sample below: void f6() { cv::Mat src = cv::imread("d:\file.jpg"); cv::Mat scaled; float scale = 0.25; cv::resize(src, scaled, cv::Size(), scale, scale, CV_INTER_CUBIC); }

The function crashes while the destruction of cv::Mat is executed. It crashes in the function deallocate() in Mat::release(). I don't understand the reason for the crash.

Dudi gravatar imageDudi ( 2020-10-04 03:02:54 -0500 )edit