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Exception raised on undecimated decomposition for large image #19

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wickeat opened this issue Jan 20, 2020 · 2 comments
Open

Exception raised on undecimated decomposition for large image #19

wickeat opened this issue Jan 20, 2020 · 2 comments

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@wickeat
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wickeat commented Jan 20, 2020

I've encountered an exception when trying to perform swt2 or modwt2 on a large image (dimension is 23000 x 30000 pixels). Is there a limit to the allowable size of image for decomposition in the decomposition functions? Would there be a workaround to this issue?
@wickeat wickeat changed the title Exception raised on decomposition for large image Exception raised on undecimated decomposition for large image Jan 20, 2020
@rafat
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rafat commented Jan 20, 2020 via email

@wickeat
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wickeat commented Jan 21, 2020 •
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The exception is Exception thrown at 0x00007FF69A74A25F in Test.exe: 0xC0000005: Access violation writing location 0x0000000000000000. occurred.

Below is a snippet of the code written.

    auto obj = wave_init("sym2"); // Initialize the wavelet

    cv::Mat doubleIn;
    cv::Mat doubleOut = cv::Mat::zeros(input.size(), CV_64F);
    input.convertTo(doubleIn, CV_64F);
    auto inp = reinterpret_cast<double*>(doubleIn.data);
    auto oup = reinterpret_cast<double*>(doubleOut.data);

    int J = 1;

    auto wt = wt2_init(obj, "modwt", doubleIn.rows, doubleIn.cols, J);

    // Perform decomposition
    auto wavecoeffs = modwt2(wt, inp);

The exception is raised at the modwt2 function.

This piece of code worked for other smaller images, but not on the big one I have tried.

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@rafat @wickeat