Perceptual basis of aliasing and antialiasing

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Abstract
Temporal sampling artifacts may cause jitter in moving video images. Most often, these artifacts are attributed to aliasing in the spatiotemporal spectrum of the image. However, the spatiotemporal spectrum is only a mathematical representation, so the practical value of this approach depends on a number of assumptions about human vision. Most importantly, there must be a linear summation of the individual components. This assumption was tested with both quantitative and informal experiments. Initial results showed that the spatiotemporal model was accurate for simple sine-wave gratings and slightly overestimated aliasing for more complex gratings. However, it was possible to create compound gratings where the model grossly overestimated aliasing. Results showed that, in general, the assumption of linear summation is unwarranted and that jitter in complex images cannot always be predicted from their constituent components. One practical implication of this result is that image quality testing should include natural images.

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