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• W1972154920 abstract "Shape-from-shading (SFS) is a classical inverse problem in computer and human vision. This shape reconstruction problem is inherently ill-posed. We show that the isophotes on smooth surfaces with Lambertian reflectance can be directly related to surface properties without consideration of the light source. Using techniques from modern differential geometry, we derive relationships between the curvature of the isophotes and the shape operator for the surface. Neurobiology motivates the geometric approach, and our calculations allow us to characterize the matching local family of surfaces that can result from any given shading patch. We illustrate the local ambiguity in several examples." @default.
• W1972154920 created "2016-06-24" @default.
• W1972154920 creator A5012924253 @default.
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• W1972154920 date "2014-01-01" @default.
• W1972154920 modified "2023-09-26" @default.
• W1972154920 title "How Shading Constrains Surface Patches without Knowledge of Light Sources" @default.
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• W1972154920 doi "https://doi.org/10.1137/13092647x" @default.
• W1972154920 hasPublicationYear "2014" @default.
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