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. 2020 Jan 28;145(2):295–305. doi: 10.1097/PRS.0000000000006461

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Copyright © 2020 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of the American Society of Plastic Surgeons. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Fig. 2. — Three-dimensional digital stereophotogrammetry. The three-dimensional digital stereophotogrammetry system uses computer-vision technology to track facial surface deformations for a given area of interest, through an expression, to quantify stretch (percentage) and compression (percentage). (Left) Positive strain is an indication of surface stretch, with red indicating areas with the greatest degree of stretch and blue indicating areas with the least amount of stretch. (Right) Negative strain is an indication of surface compression, with blue indicating areas with the greatest degree of compression and red indicating areas with the least amount of compression. (Courtesy of Canfield Scientific, Inc.)