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. 2022 Jun 27;252:109278. doi: 10.1016/j.knosys.2022.109278

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Fig. 5 — Procedures of preprocessing. (a) Extract the axial slices. (b) Morphological operation on the image. (c) Binarize image by thresholding. (d) Identify the basic contour and make mask. (e) Multiply the image with mask. (f) Crop the image to get the ROI.