Antialiasing strategies

CS 248 - Introduction to Computer Graphics
Autumn Quarter, 2004
Marc Levoy
Lecture notes for Tuesday, October 12

Notes for the frequency domain analysis of sampling were added to the October 7 lecture.

Table of contents:

• What's the best way to prevent aliasing?
  • Raising the sampling rate versus filtering
  • Problem: fixed resolution displays
• Supersampling followed by resampling
  • The resampling pipeline
  • Preconvolving r and g
  • Approximations
  • Supersampling versus filtering
  • What supersampling and averaging down accomplishes
• Practical supersampling
  • Algorithm 1: regular supersampling
  • Algorithm 2: practical stochastic supersampling
  • Demonstration of supersampling

I don't have time in this course to show you what supersamping and averaging down looks like in the frequency domain. If you're interested, look at this handout from CS 348B.