Modelling the human perception of shape-from-shading

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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/2148 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/2148 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/2148 archive 4031 disk0/00/00/08/74 2010-08-03 16:47:45 2019-01-23 09:53:02 2011-07-19 16:24:49 thesis show 0 Sun Peng Schofield Andrew J. University of Birmingham Modelling the human perception of shape-from-shading unpub T1 BF 10col_life Shading conveys information on 3-D shape and the process of recovering this information is called shape-from-shading (SFS). This thesis divides the process of human SFS into two functional sub-units (luminance disambiguation and shape computation) and studies them individually. Based on results of a series of psychophysical experiments it is proposed that the interaction between first- and second-order channels plays an important role in disambiguating luminance. Based on this idea, two versions of a biologically plausible model are developed to explain the human performances observed here and elsewhere. An algorithm sharing the same idea is also developed as a solution to the problem of intrinsic image decomposition in the field of image processing. With regard to the shape computation unit, a link between luminance variations and estimated surface norms is identified by testing participants on simple gratings with several different luminance profiles. This methodology is unconventional but can be justified in the light of past studies of human SFS. Finally a computational algorithm for SFS containing two distinct operating modes is proposed. This algorithm is broadly consistent with the known psychophysics on human SFS. 2010-07 2010-06 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 273 University of Birmingham School of Psychology d_ph FALSE na 2010-07 graduation