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. 2015 Sep 18;15(9):23805–23846. doi: 10.3390/s150923805

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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The method of integral images for the efficient computation of sums of intensities in a window. The sum of intensities in Window A can be calculated as $I I_{4} + I I_{1} - (I I_{2} + I I_{3})$ .