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Frame HSV color distribution: (a) A sample VIO frame. (b) The scatter plot of the HSV color values of the sample frame. Retinal pixels (green), exhibit a narrow color distribution in HSV space relative to the rest of the image (blue). While the retinal pixels constitute 30% of the image, they are more tightly clustered than the non-retinal pixels. (c) Color-coded frame: retinal pixels are shown in green and non-retinal pixels in blue.
