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. 2021 Dec 10;8:733241. doi: 10.3389/fmed.2021.733241

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Copyright © 2021 Li, Li, Zhang, Liang, Chen, Ye and Lin.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Aiding the patients with low vision and blindness. (A–C) Illustrate using distance-based vision aid AR system to help the blind. (A) The natural scene. (B) The method using colors to indicate distances (37). The area in warmer colors indicates the closer distances, while the area in cooler colors indicates the farther. (C) The method using brightness to indicate distances (36). Brighter indicates closer distance while darker indicates farther. (D–I) Illustrate different methods to aid the patients with low vision (39). (D) The natural vision of patients with low vision. (E) The magnification method. (F) The edge enhancement method. (G) The contrast enhancement method. (H) The text extraction method. (I) The object recognition method.