Is the perception of 3D shape from shading based on assumed reflectance and illumination?
Identifieur interne : 003982 ( Ncbi/Checkpoint ); précédent : 003981; suivant : 003983Is the perception of 3D shape from shading based on assumed reflectance and illumination?
Auteurs : James T. Todd ; Eric J. L. Egan ; Flip PhillipsSource :
- i-Perception [ 2041-6695 ] ; 2014.
Abstract
The research described in the present article was designed to compare three types of image shading: one generated with a Lambertian BRDF and homogeneous illumination such that image intensity was determined entirely by local surface orientation irrespective of position; one that was textured with a linear intensity gradient, such that image intensity was determined entirely by local surface position irrespective of orientation; and another that was generated with a Lambertian BRDF and inhomogeneous illumination such that image intensity was influenced by both position and orientation. A gauge figure adjustment task was used to measure observers' perceptions of local surface orientation on the depicted surfaces, and the probe points included 60 pairs of regions that both had the same orientation. The results show clearly that observers' perceptions of these three types of stimuli were remarkably similar, and that probe regions with similar apparent orientations could have large differences in image intensity. This latter finding is incompatible with any process for computing shape from shading that assumes any plausible reflectance function combined with any possible homogeneous illumination.
Url:
DOI: 10.1068/i0645
PubMed: 26034561
PubMed Central: 4441026
Affiliations:
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Is the perception of 3D shape from shading based on assumed reflectance and illumination?</title><author><name sortKey="Todd, James T" sort="Todd, James T" uniqKey="Todd J" first="James T." last="Todd">James T. Todd</name></author><author><name sortKey="Egan, Eric J L" sort="Egan, Eric J L" uniqKey="Egan E" first="Eric J. L." last="Egan">Eric J. L. Egan</name></author><author><name sortKey="Phillips, Flip" sort="Phillips, Flip" uniqKey="Phillips F" first="Flip" last="Phillips">Flip Phillips</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26034561</idno><idno type="pmc">4441026</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4441026</idno><idno type="RBID">PMC:4441026</idno><idno type="doi">10.1068/i0645</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000239</idno><idno type="wicri:Area/Pmc/Curation">000239</idno><idno type="wicri:Area/Pmc/Checkpoint">000B54</idno><idno type="wicri:Area/Ncbi/Merge">003982</idno><idno type="wicri:Area/Ncbi/Curation">003982</idno><idno type="wicri:Area/Ncbi/Checkpoint">003982</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Is the perception of 3D shape from shading based on assumed reflectance and illumination?</title><author><name sortKey="Todd, James T" sort="Todd, James T" uniqKey="Todd J" first="James T." last="Todd">James T. Todd</name></author><author><name sortKey="Egan, Eric J L" sort="Egan, Eric J L" uniqKey="Egan E" first="Eric J. L." last="Egan">Eric J. L. Egan</name></author><author><name sortKey="Phillips, Flip" sort="Phillips, Flip" uniqKey="Phillips F" first="Flip" last="Phillips">Flip Phillips</name></author></analytic><series><title level="j">i-Perception</title><idno type="eISSN">2041-6695</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>The research described in the present article was designed to compare three types of image shading: one generated with a Lambertian BRDF and homogeneous illumination such that image intensity was determined entirely by local surface orientation irrespective of position; one that was textured with a linear intensity gradient, such that image intensity was determined entirely by local surface position irrespective of orientation; and another that was generated with a Lambertian BRDF and inhomogeneous illumination such that image intensity was influenced by both position and orientation. A gauge figure adjustment task was used to measure observers' perceptions of local surface orientation on the depicted surfaces, and the probe points included 60 pairs of regions that both had the same orientation. The results show clearly that observers' perceptions of these three types of stimuli were remarkably similar, and that probe regions with similar apparent orientations could have large differences in image intensity. This latter finding is incompatible with any process for computing shape from shading that assumes any plausible reflectance function combined with any possible homogeneous illumination.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Belhumeur, P N" uniqKey="Belhumeur P">P. N. Belhumeur</name></author><author><name sortKey="Kriegman, D J" uniqKey="Kriegman D">D. J. Kriegman</name></author><author><name sortKey="Yuille, A L" uniqKey="Yuille A">A. L. 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Kappers</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Todd, J T" uniqKey="Todd J">J. T. Todd</name></author><author><name sortKey="Reichel, F D" uniqKey="Reichel F">F. D. Reichel</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Wijntjes, M W A" uniqKey="Wijntjes M">M. W. A. Wijntjes</name></author><author><name sortKey="Doerschner, K" uniqKey="Doerschner K">K. Doerschner</name></author><author><name sortKey="Kucukoglu, G" uniqKey="Kucukoglu G">G. Kucukoglu</name></author><author><name sortKey="Pont, S C" uniqKey="Pont S">S. C. Pont</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Zhang, R" uniqKey="Zhang R">R. Zhang</name></author><author><name sortKey="Tsai, P" uniqKey="Tsai P">P. Tsai</name></author></analytic></biblStruct></listBibl></div1></back></TEI><affiliations><list></list><tree><noCountry><name sortKey="Egan, Eric J L" sort="Egan, Eric J L" uniqKey="Egan E" first="Eric J. L." last="Egan">Eric J. L. Egan</name><name sortKey="Phillips, Flip" sort="Phillips, Flip" uniqKey="Phillips F" first="Flip" last="Phillips">Flip Phillips</name><name sortKey="Todd, James T" sort="Todd, James T" uniqKey="Todd J" first="James T." last="Todd">James T. Todd</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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