Algorithm 3. Pseudocode for reassembling the different available images within one.

pyramidNew[lv] for (i = 0 in level) do     pyramidNew[i] = sub(pyramidPrev[i], pyramidNext[i])     smooth(pyramidNext[i])     for (i = level −1 to 1) do      upScaled = upscale(PyramidNew[i])      pyramidNew[i − 1] = pyramidNew[i − 1] + upScaled      end for end for gray2RGB(pyramidNew[0]) return pyramidNew[0]