English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  A model of stereo segmentation by contextual influences: popout, disparity capture, transparency, and depth boundary enhancement

Dayan, P., & Li, Z. (2001). A model of stereo segmentation by contextual influences: popout, disparity capture, transparency, and depth boundary enhancement. In 31st Annual Meeting of the Society for Neuroscience (Neuroscience 2001).

Item is

Basic

show hide
Genre: Meeting Abstract

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Dayan, P1, Author              
Li, Z1, Author              
Affiliations:
1External Organizations, ou_persistent22              

Content

show
hide
Free keywords: -
 Abstract: We construct a model of intracortical interactions in V2 to capture the following physiological and psychophysical phenomena: 1) depth edge highlighting, a V2 cell often responds more vigorously when its receptive field (RF) is near a depth edge (von der Heydt et al 2000); 2) disparity capture, V2 responses are tuned to the depth values at surface boundaries beyond their RFs (Bakin et al 2000); 3) popout, a target pops out perceptually from a background of distractors at a different depth; and 4) transparency, two superposed random dot stereo depth planes perceptually segregate. Each model cell is binocular and tuned to a specific depth. The input stimuli (and RFs) are individual dots in visual space without orientation, color, or motion information. The model inputs and initial responses include both correct and false matches between stimuli dots in the two eyes, as suggested by the responses of V1 cells (Cumming and Parker, 2000), which provide inputs to V2. Finite range horizontal connections link model cells tuned to similar depth values. Nearby model pyramidal cells influence each other via mono-synaptic facilitation or disynaptic inhibition. Contextual influences modify the cell responses, such that activities in the model are ultimately significant only from cells whose preferred disparities correspond to the correct matches. This models disparity capture and transparency. Furthermore, responses are higher to the lone target dot of a unique disparity, or dots near a depth edge, enabling pop-out and region segmentation. We suggest that the contextual influences determine many stereo grouping phenomena.

Details

show
hide
Language(s):
 Dates: 2001-11
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: -
 Degree: -

Event

show
hide
Title: 31st Annual Meeting of the Society for Neuroscience (Neuroscience 2001)
Place of Event: San Diego, CA, USA
Start-/End Date: 2001-11-10 - 2001-11-15

Legal Case

show

Project information

show

Source 1

show
hide
Title: 31st Annual Meeting of the Society for Neuroscience (Neuroscience 2001)
Source Genre: Proceedings
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: 680.1 Start / End Page: - Identifier: -