This paper discusses geometrical distortions (i.e., errors) found in a reconstructed two-dimensional (2D) image from three-dimensional (3D) space by human observers with stereopsis. Psychological experiments employing stimuli of 2D- and 3D- Poggendorff illusion show that the difference in effect between the two conditions agrees well with an estimation calculated from the errors mentioned above. It is therefore suggested that the phenomenon that causes Poggendorff illusion works as an error compensator when the observer views lines with occlusion in a normal 3D space. Key-words: Poggendorff illusion. Stereopsis, Binocular vision, Amodal completion, Perception. Human vision.
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