Fig. 4.

Schematic illustration of general nonlocal mean label propagation expressed by Equation (4). In this example, M training images are available, together with their segmentation ground truths. The patch-based representation of the reference voxel $\overrightarrow{x}$ is denoted by the small green square in the new treatment image. The pink squares denote the searching window, where voxels lying within the searching window in each training image are served as candidate voxels. For each candidate voxel $\overrightarrow{y}$ in the ith training image, its contribution is determined by the graph weight $w_i(\overrightarrow{x},\overrightarrow{y})$.