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6 Index of refraction . . . . . . . . . . . . 1 Properties related to interfaces and surfaces . . . . . . 1 43 Surface emission . . . . . . . . . . . . 2 Refraction . . . . . . . . . . . . . . 3 Specular reflection . . . . . . . . . . . . 4 Diffuse reflection . . . . . . . . . . . . 5 Reflection models in computer graphics . . . . . 50 Bulk-related properties of objects . . . . . . . . . 1 Attenuation of radiation .

Luminous energy and luminous flux. The luminous energy can be thought of as the portion of radiant energy causing a visual sensation at the human retina. Radiant energy beyond the visible portion of the spectrum can also be absorbed by the retina, eventually causing severe damage to the tissue, but without being visible to the human eye. The luminous flux defines the total luminous energy per unit time interval (“luminous power”) emitted from a source or received by a detector. The units for luminous flux and luminous energy are lm (lumen) and lm s, respectively.

2 Volume emission . . . . . . . . . . . . 3 Luminescence . . . . . . . . . . . . . 59 References . . . . . . . . . . . . . . . . . 61 Introduction This chapter provides the fundamentals of interaction of radiation with objects and matter. It should help those who want to search for an appropriate spectral range to visualize object features rather than taking illumination as the given. Quantitative visualization in computer vision requires knowledge of both the physical properties of the objects Handbook of Computer Vision and Applications Volume 1 Sensors and Imaging 37 Copyright © 1999 by Academic Press All rights of reproduction in any form reserved.

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