Function getRandomNeighbor

examples/image_processing/filters.cpp:47–57

* Retrieve a new image of same dimensions of the original image * where each original image's pixel is replaced by randomly picked * neighbor in the provided local neighborhood window */

 * neighbor in the provided local neighborhood window
 */
array getRandomNeighbor(const array &in, int windW, int windH) {
    array rnd = 2.0f * randu(in.dims(0), in.dims(1)) - 1.0f;
    array sx  = seq(in.dims(0));
    array sy  = seq(in.dims(1));
    array vx  = tile(sx, 1, in.dims(1)) + floor(rnd * windW);
    array vy  = tile(sy.T(), in.dims(0), 1) + floor(rnd * windH);
    array vxx = clamp(vx, 0, in.dims(0));
    array vyy = clamp(vy, 0, in.dims(1));
    array in2 = moddims(in, vx.elements(), 3);
    return moddims(in2(vyy * in.dims(0) + vxx, span), in.dims());
}

/**
 * randomly pick neighbor from given window size and replace the