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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Processing steps for the oximeter display images. (a) The oximeter image taken by the camera; (b) the ANN output points marked in red; (c) the resulting warping procedure given the VGG16 points; (d) flipping the image to generate the final image.