The ability of observers to discriminate between stimuli differing in orientation was measured using low contrast, foveally viewed stimuli. Detection and discrimination performance were measured simultaneously. A model is presented which permits bandwidths of orientation-tuned mechanisms to be estimated from the data. In a group of five observers, half-amplitude bandwidths varied from 10 degrees to 20 degrees.

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The threshold motion rates that produce edge flicker were determined as a function of contrast, luminance and sampling frequency. A passive filtering scheme, called the Movieola filter, appears to mitigate this artifact. The Movieola filter produces interpolated frames based on a passive two-tap discrete dissolve. It is simple to implement and therefore relatively inexpensive to manufacture.