Color of specular highlights

Elli Angelopoulou; Sofya Poger

doi:10.1117/12.473905

17 June 2003 Color of specular highlights

Elli Angelopoulou, Sofya Poger

Proceedings Volume 5007, Human Vision and Electronic Imaging VIII; (2003) https://doi.org/10.1117/12.473905
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

Abstract

An integral part of computer graphics, machine vision and human vision understanding is modeling how a surface reflects light. There is a substantial body of work on models describing surface reflectance ranging from purely matte to purely specular. One of the advantages of diffuse reflectance is that the color and the intensity of the reflected light are separable for most materials. Color is determined by the chromophores of the material, while intensity depends on the scene geometry. In specular highlights the color and the intensity of a specularity depend on both the geometry and the index of refraction of the material, which in turn is a function of wavelength. The graphics and vision communities often employ the following simplifying assumption when modeling specular highlights: For non-conductive materials the color of the specularity is the color of the light source. We will show that in most cases this assumption is violated. Theoretical analysis demonstrates that even for non-metallic surfaces the reflectivity ratio at specularities varies with both wavelength and angle of incidence. Furthermore, our experiments with a multispectral sensor clearly show that the deviation of the color of the specularities from the color of the incident light can be consistently measured.

Citation Download Citation

Elli Angelopoulou and Sofya Poger "Color of specular highlights", Proc. SPIE 5007, Human Vision and Electronic Imaging VIII, (17 June 2003); https://doi.org/10.1117/12.473905

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available