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. 2019 Jun 26;19(13):2846. doi: 10.3390/s19132846

Figure 4.

Figure 4

An example of output result at each step of our proposed data processing procedure. (a) Screenshot from the smartphone built-in application, (b) its cropped image, (c) the binary image derived by the RGB to HSV transformation and background removal, and (d) extracted signal by scaling the binary image to the x-y axis.