Program Number: OS3P-4-03 Presentation Time: Friday, July. 21, 14:30 - 14:45
The role of disparity energy and binocular matching processes in stereopsis
Takahiro Doi, Seiji Tanabe, Ichiro Fujita
Lab. Cognitive Neurosci., Osaka Univ., Japan
The early visual system computes disparity energy of stereo images. Some of the next stages retain this information, while other stages perform further computation to solve the stereo correspondence problem. We addressed how the energy and correspondence computations underlie stereopsis. We asked human subjects to discriminate depth of random-dot stereograms with various amounts of disparity. At each disparity level, we manipulated the proportion of dots with the same luminance contrast between the two eyes by reversing the contrast of some dots in one eye. At small disparities, the proportion of correct choices increased monotonically from chance to perfect as the proportion of the same-contrast dots was increased. At large disparities, the subjects perceived reversed depth when contrast-reversed dots dominated, and the proportion of correct choices reached only chance level when the two types of dots were balanced. The results suggest that the correspondence and energy computations underlie fine and coarse stereopsis, respectively.
Keywords: Stereopsis, Computation, Psychophysics, Depth perception
Reserch Funds: MEXT (17022025) and the Takeda Science Foundation