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. 2021 Oct 28;8:280. doi: 10.1038/s41597-021-01055-x

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© The Author(s) 2021

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Fig. 3 — Four different images from the same sensor hub, comparing the relative “brightness” of the images, as described by the average pixel value. The images shown are 112 × 112 pixels. (a) Average pixel brightness: 106. (b) Average pixel brightness: 43. (c) Average pixel brightness: 32. (d) Average pixel brightness: 10.