Reducing resolution loss in Two-Pass rendering by optimal view directions and Display-Surface partitioning

R. Matt Steele, Christopher Jaynes, Ruigang Yang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

We describe a method for reducing the amount of aliasing or resolution loss in two-pass rendering for distortion and alignment correction of a projector-based display. Resolution loss is caused by the fact that the second rendering pass must resample the result of the first rendering pass, and the two procedures in general have sampling rates that vary differently. We show that for a flat display surface, it is possible to choose a viewing direction for the first-pass render so that its sampling-rate variations cancel with variations of the second-pass sampling rate. This means that the first-pass effectively S mples the projector frame-buffer evenly, so an appropriate resolution for the first-pass render will provide uniformly low aliasin over the entire framebuffer. We also show that, for flat display surfaces, this choice of view direction can be combined with a appropriate first-pass intrinsics matrix to eliminate the need for a second pass. The resulting single-pass rendering algorithm is very similar to existing single-pass techniques, but has a few advantages that we discuss. For a non-flat display surface, relative sampling cannot be made perfectly uniform, but the optimal view direction for a best-fit plane provides an approximate solution when the display surface is almost flat. Although the approximation is poor when the display surface differs radically from a plane, we d scribe a technique for those cases, which automatically subdivide s the display surface into partitions that are approximately planar. In common displaysurface configurations, great improvements in rendering quality are obtained by using two or three partitions, which causes only modest rendering overhead.

Original languageEnglish
Title of host publicationPROCAMS 2008 - ACM/IEEE 5th International Workshop on Projector Camera Systems
DOIs
StatePublished - 2008
EventACM/IEEE 5th International Workshop on Projector Camera Systems, PROCAMS 2008 - Marina del Rey, CA, United States
Duration: Aug 10 2008Aug 10 2008

Publication series

NamePROCAMS 2008 - ACM/IEEE 5th International Workshop on Projector Camera Systems

Conference

ConferenceACM/IEEE 5th International Workshop on Projector Camera Systems, PROCAMS 2008
Country/TerritoryUnited States
CityMarina del Rey, CA
Period8/10/088/10/08

Keywords

  • Projector calibration
  • Projector-camera systems
  • Shadow map

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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