Figure 4.

Single-stage filter model. (a) Image-computable model with a single stage of filtering (IC-1). Luminance differences are computed across the left-oblique and right-oblique diagonals, passed through a rectifying, exponentiating nonlinearity and subtracted to determine the probability P(R) of observer classifying the boundary as right-oblique. In the case where there is only a luminance difference across one diagonal, this model is equivalent to the IC-SDT model (Eq. (4)). (b) Fits of the model in (a) to LTB segmentation data from Experiment 1a for the same observers as in Fig. 3a.