Abstract: Anti-aliasing is generally an expensive process because it requires super-sampling or sophisticated rendering. This paper presents a new type of anti-aliasing filter for animation sequences, the pixel-tracing filter, that does not require any additional sample nor additional calculation in the rendering phase. The filter uses animation information to calculate correlation among the images, and sub-pixel information is extracted from the sequence based on the correlation. Theoretical studies prove that the filter becomes an ideal anti-aliasing filter when the filter size is infinite. The algorithm is simple image processing implemented as post-filtering. The computational cost is independent of the complexity of the scene. Experiments demonstrate the efficiency of the filter. Almost complete anti-aliasing was achieved at the rate of about 30 seconds per frame for very complex scenes at a resolution of 256 x 256 pixels. The pixel tracing filter provides effective anti-aliasing for animation sequences at a very modest computational cost.