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. 2022 Jan 20;17(1):e0262763. doi: 10.1371/journal.pone.0262763

Fig 4. Achromatic and chromatic contrast of “mouse-view” images.

Fig 4

(A,B) Root mean square (RMS) contrast of the upper (A) and lower (B) field images, computed independently for the UV (violet) and Green (green) channels of each image (local patch size, 30 pixel radius; Eq (4) in Methods). The UV channel has higher achromatic contrast, especially for the upper visual field images (median ± interquartile range). (C,D) Chromatic contrast distributions (median ± interquartile range) computed as a difference of the RMS contrasts between the UV and Green channels (Eq (5) in Methods). The distribution was asymmetric for the upper field images (C) but rather symmetric for the lower field images (D). (E,F): Scale (β; E) and shape (γ; F) parameters from the Weibull distribution fitted to each side of the chromatic contrast distribution of each image. The box plot shows the median ± interquartile range. The upper field images contain fewer pixels that have higher contrast in Green than in UV (rank-sum test: Three stars “⋆⋆⋆” indicating p<0.001; ⋆⋆, p<0.01; and ⋆, p<0.05).