Figure 1.

NLM lesion inpainting strategy. The inpainting process starts with the lesion mask (L) of the original image (I) in the downsampled space k to obtain the inpainted image of this level. Then, the inpainted region is upsampled into the image of the next hierarchical level. The inpainting itself consists in finding the most similar patches [P(j), in green] in the “non-lesion” region with the considered patch P(i). All voxels in white are not considered during the patch distance estimation. The concentric filling is described by the boundary of the current mask (L^* in yellow) shrinking by one voxel at the next “Layer”. The original lesion mask L is reinitiated at the beginning of each hierarchical “Level.”