منابع مشابه
Illumination Distribution from Shadows
The image irradiance of a three-dimensional object is known to be the function of three components: the distribution of light sources, the shape, and reflectance of a real object surface. In the past, recovering the shape and reflectance of an object surface from the recorded image brightness has been intensively investigated. On the other hand, there has been little progress in recovering illu...
متن کاملIllumination from Shadows
In this paper, we introduce a method for recovering an illumination distribution of a scene from image brightness inside shadows cast by an object of known shape in the scene. In a natural illumination condition, a scene includes both direct and indirect illumination distributed in a complex way, and it is often difficult to recover an illumination distribution from image brightness observed on...
متن کاملIllumination Recovery from Images with Cast Shadows
Title of thesis: ILLUMINATION RECOVERY FROM IMAGES WITH CAST SHADOWS Xue Mei Master of Science, 2007 Thesis directed by: Professor Gang Qu Department of Electrical and Computer Engineering and Professor David Jacobs Department of Computer Science The effects produced in an image by cast shadows can be quite complex, especially when light comes from all directions. This makes it difficult to rec...
متن کاملSelf Shadows and Cast Shadows in Estimating Illumination Distribution
This paper compares two methods for estimating illumination distributions from shadows: methods using self shadows and cast shadows. The cast shadow method provides an effective framework for recovering illuminations in a real scene utilizing variations of image brightnesses inside shadows cast by an occluding object of known shape. The shadow surface is typically the same plane on which the ob...
متن کاملRecovery of Chromaticity Image Free from Shadows via Illumination Invariance
A recent method for recovering a greyscale image that is free from shadow effects is extended such that the recovered image is a colour image, in the sense that 2-dimensional chromaticity information is recovered. First, the effect of lighting change, and thus to a large degree shadowing, is removed by projecting logarithms of 2D colour band-ratio chromaticities into a direction that is indepen...
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ژورنال
عنوان ژورنال: IEEE Transactions on Pattern Analysis and Machine Intelligence
سال: 2003
ISSN: 0162-8828
DOI: 10.1109/tpami.2003.1182093