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Integration of shape from shading and stereo
Pattern Recognition, 1995Abstract Stereo algorithms suffer from the lack of local surface texture due to smoothness of depth constraint, or local miss-matches in disparity estimates. Thus, most stereo methods only provide a coarse depth map which can be associated with a low pass image of the depth map.
Cryer, James Edwin +2 more
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1984
The process of extracting three-dimensional shape information from smooth gradations of reflected light intensity. It has been shown by Horn that if certain assumptions are made concerning the reflectance function and illumination of a surface it is possible to formulate and solve equations relating surface shape to the measured intensities in an image
Alan Bundy, Lincoln Wallen
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The process of extracting three-dimensional shape information from smooth gradations of reflected light intensity. It has been shown by Horn that if certain assumptions are made concerning the reflectance function and illumination of a surface it is possible to formulate and solve equations relating surface shape to the measured intensities in an image
Alan Bundy, Lincoln Wallen
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2004
One of the earliest problems in computer vision is the “shape from shading problem” [87, 89, 88]. The question is how to reconstruct the shape of a smooth “Lambertian” object from a given single gray-level image. Excluding interreflections and specularities, the shading image of a Lambertian object is a function of the projection of the surface normal ...
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One of the earliest problems in computer vision is the “shape from shading problem” [87, 89, 88]. The question is how to reconstruct the shape of a smooth “Lambertian” object from a given single gray-level image. Excluding interreflections and specularities, the shading image of a Lambertian object is a function of the projection of the surface normal ...
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Modern shape from shading and beyond
2011 18th IEEE International Conference on Image Processing, 2011Shape from shading (SFS) is one of the most fundamental problems in Computer Vision: reconstruction of the three-dimensional (3D) shape of photographed objects given a single input image. Image formation is then modelled based on assumptions on illumination and light reflectance. Solving the 3D shape from the model is useful for many applications.
Michael Breuß +2 more
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Exact Shape from Shading and Integrability
1992We propose a new method for solving the image irradiance equation for the reconstruction of shape from shading. This partial differential equation is reduced to a nonlinear algebraic equation if the surface is represented in gradient space. Since the solution in gradient space is underconstrained, we enforce the integrability of the computed vector ...
Bert Janfeld, Hanspeter A. Mallot
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Shape representations from shading primitives
1998Diffuse interreflections mean that surface shading and shape are related in ways that are difficult to untangle; in particular, distant and invisible surfaces may affect the shading field that one sees. The effects of distant surfaces are confined to relatively low spatial frequencies in the shading field, meaning that we can expect signatures, called ...
John A. Haddon, David A. Forsyth
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Uniqueness in Shape from Shading Revisited
Journal of Mathematical Imaging and Vision, 1997<p>We analyse the problem of representing solutions of first-order partial differential equations in terms of complete integrals and envelopes. In this context, we revisit the uniqueness results already existing in the shape-from-shading literature that concern eikonal equations corresponding to the images of a Lambertian hemi-sphere and ...
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