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. 2015 Nov 23;10(11):e0143327. doi: 10.1371/journal.pone.0143327

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

Fig 3

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