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Anti-aliasing methods in animation

Short answer

Anti-aliasing methods reduce jagged edges and flicker from sampling. Techniques include supersampling, area sampling based on pixel coverage, pixel phasing, temporal anti-aliasing with motion blur, and low-pass filtering.

What are anti-aliasing methods in computer animation?

Aliasing causes jagged edges and flickering or "wagon wheel" effects in moving images, because a continuous scene is sampled at limited pixel and frame rates. Anti-aliasing methods reduce it:

  • Supersampling: compute the image at higher resolution and average sub-pixels to get each pixel colour.
  • Area sampling (prefiltering): set pixel intensity in proportion to the area of the object covering the pixel.
  • Pixel phasing: shift the position of pixels slightly (sub-pixel positioning).
  • Temporal anti-aliasing: use a higher frame rate or motion blur, blending positions of moving objects across frames to avoid strobing.
  • Filtering (low-pass) of the image before display.

✓ Answer checked by Claude Opus 5.5 (high effort)

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