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Examples of finger-vein ROI and their corresponding input image to the CNN (of the 1st (a,c,e) and 2nd trials (b,d,f) from the same finger of one individual) for case 1 training and testing: (a,b) good-quality; (c,d) mid-quality; and (e,f) low-quality database. In (a–f), the left and right images are the finger-vein ROI and its corresponding input image to the CNN, respectively.
