Function usm

examples/image_processing/image_editing.cpp:45–50

* radius effects the level of details that will effected during sharpening * process amount value should be in the range [0,1] or [1,] note: value of 1.0 * for amount results unsharp masking values > 1.0 results in highboost filter * effect * */

 * effect
 * */
array usm(const array &in, float radius, float amount) {
    int gKernelLen   = 2 * radius + 1;
    array blurKernel = gaussianKernel(gKernelLen, gKernelLen);
    array blur       = convolve(in, blurKernel);
    return (in + amount * (in - blur));
}

/**
 * x,y - starting position of zoom