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. 2019 Feb 1;19(3):609. doi: 10.3390/s19030609

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© 2019 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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(a) Distribution of multifocal point, (b) distribution of focal zones. The point P(x_i, z_i) is located in the focal zone will get the good image. The x_i represents the distance in the X-axis, z_i is the depth of point P in the Z-axis.