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. 2018 Jun 27;18(7):2059. doi: 10.3390/s18072059

Figure 2.

Figure 2

Illustration of (a) an infrared filtered imaging system (IRCF: infrared cut-off filter); (b) RGBN imaging system; (c) See3CAM-CU4 RGBN cameras used in the experiments. The infrared cut-off filter can be seen in the left side of the figure; it is used to generate the ground truth RGB images.