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. 2021 Jun 1;2021(1):niab006. doi: 10.1093/nc/niab006

Figure 7.

Figure 7.

The ‘scale space’ model of edge sharpness and blur. Two kinds of physical stimulus are illustrated: a high-resolution (physically sharp) feature at left, and a low-resolution (physically blurred) feature at right. These are represented as lines indicating existence of content across a range of scales, at a single spatial position: the high-resolution edge has content across a broad range of scales (A, C), while the low-resolution edge is missing the fine-scale content (B, D). The high-resolution edge evokes a complete response in a set of fine-scale filters like those found in the fovea (A), corresponding to perceptual sharpness, while the low-resolution edge evokes an incomplete response (B)—some of the filters do not respond—corresponding to perceptual blurriness. However, both features evoke complete responses for a set of coarser-scale filters like those found in the periphery (C, D).