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VisionA Computational Investigation into the Human Representation and Processing of Visual Information$
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David Marr

Print publication date: 2010

Print ISBN-13: 9780262514620

Published to MIT Press Scholarship Online: August 2013

DOI: 10.7551/mitpress/9780262514620.001.0001

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The Immediate Representation of Visible Surfaces

The Immediate Representation of Visible Surfaces

(p.268) Chapter 4 The Immediate Representation of Visible Surfaces

David Marr

The MIT Press

This chapter describes the issues and problems surrounding the idea of the 2½-D sketch. The construction of this sketch is a pivotal point for the theory marking the last step before a surface’s interpretation and the end, perhaps, of pure perception. The chapter also addresses the flaw in the idea of image segmentation, and discusses the original proposal for a viewer-centered representation that uses surface primitives of one (small) size. It argues that the 2½-D sketch is useful due to its explicit information about the image in a form which is closely matched to what early visual processes can deliver. Moreover, it is supposed that it is best to regard all surface contours in the 2½-D sketch as trying for a three-dimensional interpretation.

Keywords:   ½-D sketch, image segmentation, viewer-centered representation, visual processes, surface contours

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