Lecture Notes in Computer Science vol:2525 pages:311-321
International workshop on biologically motivated computer vision - BMCV edition:2 location:Tübingen, Germany date:22-24 November 2002
In the Kanizsa figure, an illusory central area and its contours are perceived. Replacing the pacman inducers with other shapes can significantly influence this effect. Psychophysical studies indicate that the determination of depth is a task that our visual system constantly conducts. We hypothesized that the illusion is due to the modification of the image according to the higher level depth interpretation. This idea was implemented in a feedback model based on a surface completion scheme. The relative depths, with their signs reflecting the polarity of the image, were determined from junctions by convolution of Gaussian derivative based filters, while a diffusion equation reconstructed the surfaces. The feedback loop was established by converting this depth map to modify the lightness of the image. This model created a central surface and extended the contours from the inducers. Results on a variety of figures were consistent with psychophysical experiments.
Kogo N., Strecha C., Fransens R., Caenen G., Wagemans J., Van Gool L., ''Reconstruction of subjective surfaces from occlusion cues'', Lecture notes in computer science, vol. 2525, pp. 311-321, 2002 (Proceedings 2nd international workshop on biologically motivated computer vision - BMCV, November 22-24, 2002, Tübingen, Germany).