Figure 1. Examples of degraded images and their original color images used in the experiment.

(A) Degraded images were created using monochromatic binarization of color images (see Materials and Methods). The examples represent various levels of difficulty. The numerical labels used in Figs. 1B, 2A, 2B, 5A, 5B, and 8 are consistent with those presented here. (B) The original images of the examples in Fig. 1A.