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 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 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 کاملEfficient Skin Detection under Severe Illumination Changes and Shadows
This paper presents an efficient method for human skin color detection with a mobile platform. The proposed method is based on modeling the skin distribution in a log-chromaticity color space which shows good invariance properties to changing illumination. The method is easy to implement and can cope with the requirements of real-world tasks such as illumination variations, shadows and moving c...
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ژورنال
عنوان ژورنال: Genome Biology
سال: 2003
ISSN: 1465-6906
DOI: 10.1186/gb-spotlight-20030304-01