A schematic illustration on how to compute the visual feature of a sampled 3D image patch for RF training and regression.

Abstract

<p><b>Left</b>: a sub-volume is sampled from a MRI/CT volume. <b>Middle</b>: we divide the sampled image patch into <i>k</i> × <i>k</i> × <i>k</i> blocks. <b>Right</b>: for each block, we compute its mean and variance using the integral image technique.</p