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Images of a subject’s forearm from four digital cameras: (a) the radial side viewed by the top camera, (b) the ulnar side viewed by the bottom camera, (c) and (d) the palmar and dorsal sides viewed by the right and left cameras, respectively. The measuring air-cuff of APG system and the hand support are marked by (1) and (2), respectively. Blue points show the random choice of 2048 samples in each view of the forearm skin.
