The Café Wall Illusion: Local and Global Perception from Multiple Scales to Multiscale

Figure 10

Mean tilts and standard errors around the four reference orientations (, , , and ), for the three “foveal” sample sets (Figure 8) with the two sampling approaches of (a) Systematic and (b) Random methods. The parameters of the model and Hough processing are as follows: edge maps at seven DoG scales ( = 4, 8, 12, 16, 20, 24, and 28), , and , with Hough parameters NumPeaks = 100, Threshold = 3, FillGap = 40, and MinLength = 450 (based on [19]).

(a) Systematic Cropping

(b) Random Cropping