Search code examples
image-processingopencv

How can I sharpen an image in OpenCV?

How can I sharpen an image using OpenCV?

There are many ways of smoothing or blurring but none that I could see of sharpening.

Solution

  • One general procedure is laid out in the Wikipedia article on unsharp masking:

    You use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area remain constant).

    To get a sharpened version of frame into image: (both cv::Mat)

    cv::GaussianBlur(frame, image, cv::Size(0, 0), 3);
cv::addWeighted(frame, 1.5, image, -0.5, 0, image);

    The parameters there are something you need to adjust for yourself.

    There's also Laplacian sharpening, you should find something on that when you google.