Effects of edge blur on model predictions of edge probability.

(a) Test image patches with varying levels of blur. (b) Gabor Filter Bank (GFB) model (see Fig 4A) responses to patches with varying levels of blur. Different curves indicate different fixed levels of Michelson contrast (blue = 0.2, orange = 0.4, yellow = 0.6). (c) Same as (a) but for Filter-Rectify-Filter (FRF) models having varying numbers of hidden units (Fig 4B).