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

Figure 11

The distribution of the line segments detected from the edge maps of the foveal sets (Figure 8), having either horizontal (left-column), vertical (center-column), or diagonal (right-column) deviations, with the two sampling methods: (a) Systematic and (b) Random Cropping. The edge maps are at seven different scales ( = 4, 8, 12, 16, 20, 24, and 28) and a fixed set of Hough parameters are used as NumPeaks = 100, Threshold = 3, FillGap = 40, and MinLength = 450 (based on [19]).

(a) Systematic Cropping

(b) Random Cropping