OSU CS 559 - Boundary Ownership by Lifting to 2.1D (8 pages)

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Boundary Ownership by Lifting to 2.1D



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Boundary Ownership by Lifting to 2.1D

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Pages:
8
School:
Oregon State University
Course:
Cs 559 - Selected Topics In Computer Graphics And Vision

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Boundary Ownership by Lifting to 2 1D Ido Leichter and Michael Lindenbaum Technion Israel Institute of Technology Computer Science Department Technion Haifa 32000 Israel idol mic cs technion ac il Abstract This paper addresses the boundary ownership problem also known as the figure ground assignment problem Estimating boundary ownerships is a key step in perceptual organization it allows higher level processing to be applied on non accidental shapes corresponding to figural regions Existing methods for estimating the boundary ownerships for a given set of boundary curves model the probability distribution function PDF of the binary figure ground random variables associated with the curves Instead of modeling this PDF directly the proposed method uses the 2 1D model it models the PDF of the ordinal depths of the image segments enclosed by the curves After this PDF is maximized the boundary ownership of a curve is determined according to the ordinal depths of the two image segments it abuts This method has two advantages first boundary ownership configurations inconsistent with every depth ordering and thus very likely to be incorrect are eliminated from consideration second it allows for the integration of cues related to image segments not necessarily adjacent in addition to those related to the curves The proposed method models the PDF as a conditional random field CRF conditioned on cues related to the curves T junctions and image segments The CRF is formulated using learnt non parametric distributions of the cues The method significantly improves the currently achieved figure ground assignment accuracy with 20 7 fewer errors in the Berkeley Segmentation Dataset 1 Introduction The boundary ownership problem is the problem of automatically deciding which of the two image segments abutting a provided curve along an object s boundary in an image is the figure i e owns the boundary and which is the ground Although the image segment corresponding to the occluding



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