Accurate image simulation by hemisphere projection

Buming Bian; Norman Wittels

doi:10.1117/12.44375

1 June 1991 Accurate image simulation by hemisphere projection

Buming Bian, Norman Wittels

Proceedings Volume 1453, Human Vision, Visual Processing, and Digital Display II; (1991) https://doi.org/10.1117/12.44375
Event: Electronic Imaging '91, 1991, San Jose, CA, United States

Abstract

Radiosity methods produce very striking interreflection effects for an enclosed diffuse environment. The quality of the images synthesized by radiosity methods varies depending on the calculation accuracy of the form factor, which is a geometric factor depending only on the relative orientation and position between two surfaces. Hemicube projection has been proposed to check the visibility between surfaces and calculate the form factor efficiently, but there is no analytical solution due to the double area integration. This paper presents a new form of the form factor and gives a theoretical derivation from the point view of illumination engineering. The new form factor contains only one area integration, so it can be computed analytically. An energy conservation condition applies to verify the correctness of the new model. The error introduced by using reciprocity as part of the form factor calculation has been eliminated, but the principle of reciprocity is maintained. The hemisphere projection method is used as an analytical solution of the new form factor. Finally, images generated by the new radiosity method are presented. Interreflection effects can be clearly seen around the intersection of the surfaces.

Citation Download Citation

Buming Bian and Norman Wittels "Accurate image simulation by hemisphere projection", Proc. SPIE 1453, Human Vision, Visual Processing, and Digital Display II, (1 June 1991); https://doi.org/10.1117/12.44375

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