Depth capture by kinetic depth and by stereopsis.

Area of Science:

• Visual Perception
• Computational Neuroscience
• Psychophysics

Background:

• Perceived depth in stereograms can be influenced by explicit disparity information.
• Stereo capture describes how explicit surface structure influences depth perception in ambiguous regions.

Purpose of the Study:

• To investigate depth capture in stereograms using both stereoscopic depth and kinetic depth (KD) cues.
• To determine if similarities exist between stereo capture and depth capture via KD.

Main Methods:

• Two experiments were conducted using an untextured 'ribbon' object superimposed on a textured cylinder.
• Cylinder curvature was defined by either disparity (stereo depth) or motion parallax (KD).
• Observers estimated the surface curvature/depth of the ribbon under ambiguous disparity or motion flow conditions.

Main Results:

• Depth capture of the ribbon was observed with a stereo-defined cylinder when ribbon disparity was ambiguous.
• Depth capture of the cylinder was observed with KD when motion flow was parallel to the ribbon.
• These findings indicate a parallel between stereo capture and KD.

Conclusions:

• Stereo capture and depth capture via kinetic depth (KD) share similar mechanisms.
• The surface structure of explicitly defined regions influences depth perception in implicitly defined regions.
• Visual depth perception mechanisms show cross-modal similarities.