© Van Lier & Vergeer, 2006
Visual Illusion Contest 2006
Rob van Lier & Mark VergeerNICI, Radboud University Nijmegen, The Netherlands
Catching Patches
© Van Lier & Vergeer, 2006
A fuzzy grid...
© Van Lier & Vergeer, 2006
A fuzzy grid. Dark background no patches
© Van Lier & Vergeer, 2006
With luminance edges however...
© Van Lier & Vergeer, 2006
A fuzzy grid. Dark background, light edges dark patches
© Van Lier & Vergeer, 2006
A fuzzy grid. Dark background, dark edges dark patches (weak)
© Van Lier & Vergeer, 2006
A fuzzy grid. Light background no patches
© Van Lier & Vergeer, 2006
A fuzzy grid. Light background, dark edges light patches
© Van Lier & Vergeer, 2006
A fuzzy grid. Light background, light edges light patches (weak)
© Van Lier & Vergeer, 2006
Another grid, but now with thicker fuzzy bars...
© Van Lier & Vergeer, 2006
A fuzzy grid. Dark background no patches
© Van Lier & Vergeer, 2006
A fuzzy grid. Dark background, light edges dark patches
© Van Lier & Vergeer, 2006
A fuzzy grid. Dark background, dark edges dark patches (weak)
© Van Lier & Vergeer, 2006
A fuzzy grid. Light background no patches
© Van Lier & Vergeer, 2006
A fuzzy grid. Light background, dark edges light patches
© Van Lier & Vergeer, 2006
A fuzzy grid. Light background, light edges light patches (weak)
© Van Lier & Vergeer, 2006
Patches follow random changes of the edges at the crossings...
© Van Lier & Vergeer, 2006
Random edges at intersections – 1
© Van Lier & Vergeer, 2006
Random edges at intersections – 2
© Van Lier & Vergeer, 2006
..and using a ‘Geier pattern‘...
© Van Lier & Vergeer, 2006
A Geier-modified Hermann grid – no patches
© Van Lier & Vergeer, 2006
The return of the patches...
© Van Lier & Vergeer, 2006
..catched between the edges!
© Van Lier & Vergeer, 2006
The end
Thanks!