Rendering in Shift-Invariant Spaces

Publication Type:

Conference Paper

Authors:

Usman R. Alim

Source:

Graphics Interface 2013, CRC Press, Regina, SK (2013)

URL:

http://dl.acm.org/citation.cfm?id=2532161
Abstract: 

 

 

 

 

 

 

 

 

conventional tent (left) vs. min. error tent (right)

We present a novel image representation method based on shift-invariant spaces. Unlike existing rendering methods, our proposed approach consists of two steps: an analog acquisition step that traces rays through the scene, and a subsequent digital processing step that filters the intermediate digital image to obtain the coefficients of a minimum-error continuous image approximation. Our approach can be easily incorporated in existing renderers with very little change and with little-to-no computational overhead. Additionally, we introduce the necessary tools needed to analyze the smoothing and post-aliasing properties of the minimum-error approximations. We provide examples of spaces — generated by the uniform B-splines — that can be readily used in conjunction with the two-dimensional Cartesian grid. Our experimental results demonstrate that minimum-error approximations significantly enhance image quality by preserving high-frequency details that are usually smoothed out by existing image anti-aliasing approaches.