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Content Provider | IEEE Xplore Digital Library |
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Author | Xiaozheng Zhang Yongsheng Gao |
Copyright Year | 2009 |
Description | Author affiliation: Computer Vision and Image Processing Lab, Griffith University, Brisbane, Australia (Xiaozheng Zhang; Yongsheng Gao) |
Abstract | Ambient reflection is widely present in many applications of computer graphics and image processing, which is traditionally modelled as a constant free from environmental factors. This paper reconsiders ambient reflection modelling of Lambertian and Phong surfaces and calculates it as reflection integrations of infinitesimal incident beams from the environment. It reveals that ambient reflection exists in variable forms for Lambertian surfaces of non-convex objects and Phong surfaces of all objects. For convex objects with Lambertian surfaces, ambient reflectance coefficient is actually the diffuse reflectance coefficient. Generalised ambient reflection models are proposed to calculate ambient reflection using the same reflection model as used in calculation of other reflections. Based on this analysis, new ambient reflection formulations of Lambertian and Phong surfaces are derived to enable efficient computations in computer graphics and image processing. |
Starting Page | 3993 |
Ending Page | 3996 |
File Size | 256687 |
Page Count | 4 |
File Format | |
ISBN | 9781424456536 |
ISSN | 15224880 |
e-ISBN | 9781424456543 |
e-ISBN | 9781424456550 |
DOI | 10.1109/ICIP.2009.5413812 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2009-11-07 |
Publisher Place | Egypt |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Optical reflection Reflectivity Lighting Image processing Surface treatment Light sources Computer graphics Layout Face recognition Geometry Phong model Ambient reflection reflection analysis Lambertian model |
Content Type | Text |
Resource Type | Article |
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