Figure 3: As for Figure 2, we show the probability of edge configurations as chevron maps for two databases (man-made, animal). Here, we show the ratio of histogram counts relative to that of the non-animal natural image dataset. Deeper and deeper red circles indicate configurations that are more and more likely (and blue respectively less likely) with respect to the histogram computed for non-animal images. In the left plot, the animal images exhibit relatively more circular continuations and converging angles (red chevrons in the central vertical axis) relative to non-animal natural images, at the expense of co-linear, parallel, and orthogonal configurations (blue circles along the middle horizontal axis). The man-made images have strikingly more co-linear features (central circle), which reflects the prevalence of long, straight lines in the cage images in that dataset. We use this representation to categorize images from these different categories in Figure 4. Go back to manuscript page.

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