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. 2017 Apr 22;17(4):925. doi: 10.3390/s17040925

Figure 2.

Figure 2

IR sensor images (12.5 mm × 12.5 mm) of an index finger vein using (a) the LED array, and (b) the laser with the MEMS scanner; the circular dots represent the detected maximum values of the curvature on the vein image.