An object that is reproduced by a stereoscopic display is perceived in front of the screen with depth distortion by human observers when the reproduced area of the object is truncated by a picture frame Experimental results suggest that (1) the occlusion condition, which contradicts a real three-dimensional situation (i.e, valid), causes this distortion, (2) observers, who misfuse a binocular image that includes the monocular region perceive the frontal-parallel plane as a slanted one, (3) this misperception is caused because the process of the information synthesis between the pictorial and binocular occlusion cues depend on the binocular disparity sign (i.e, it is caused when real world constraints were not satisfied) We show that adding a virtual picture frame (VFM : virtual frame) in front of the real screen enables human observers to perceive the correct depth.