Light Source Dependence in Shape from Shading
نویسندگان
چکیده
منابع مشابه
Light Source Dependence in Shape from Shading
We investigated shape constancy in human shape from shading under variations of illuminant direction using a local attitude probe in conjunction with a perturbation analysis. Stimuli were computer generated and depicted ellipsoids in a structured setting. Even with these simple shapes subjects settings were systematically biased in the illuminant direction and were consistent with a regression ...
متن کاملCharacterizing Ambiguity in Light Source Invariant Shape from Shading
Shape from shading is a classical inverse problem in computer vision. This shape reconstruction problem is inherently ill-defined; it depends on the assumed light source direction. We introduce a novel mathematical formulation for calculating local surface shape based on covariant derivatives of the shading flow field, rather than the customary integral minimization or P.D.E approaches. On smoo...
متن کاملReconstructing Shape from Shading Images under Point Light Source Illumination
A new photometric method is proposed fo r determining the 3-D shape of t he object from multiple shading Images under the point light source illumination. When the surface is t he perfect diffuser with the uniform reflectance, an algorithm fo r the determination of 3-D shape with positions is developed by using the method of least squares and basing on the principle of the monocular vision and ...
متن کاملShape and Source from Shading
'an iterakid direction. the gradlie? amount ofl and the ol! This rcpor1 a:tchusctts i senrcli is p/ w l d c Miel/ LASS ACTIUSET'TS INSTITIJTE OF TECHNOLOGY AZiTIFJClAI, INTl3LLIGF:NCE LABORATORY
متن کاملShape from Shading Under Coplanar Light Sources
In this paper image-based techniques for 3D surface reconstruction are presented which are especially suitable for (but not limited to) coplanar light sources. The first approach is based on a single-image shape from shading scheme, combined with the evaluation of at least two further images of the scene that display shadow areas. The second approach allows the reconstruction of surfaces by an ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Vision Research
سال: 1997
ISSN: 0042-6989
DOI: 10.1016/s0042-6989(96)00282-9