The prediction of edge raggedness via a single-channel filter model of the visual system

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Title: The prediction of edge raggedness via a single-channel filter model of the visual system
Author: Mannix, Michael G.
Abstract: Edge raggedness is a psychophysical term which refers to the fidelity of a high-contrast edge, which has been degraded by some process, compared to an ideal edge. It has been suggested that the processing of high-contrast edges shares the same spatial-frequency processing mechanisms with that of sinewave gratings. This study uses first-order psychophysical principles, determined using sinewave grating stimuli, in a model to process edges in order to derive a quantitative metric proportional to perceived edge raggedness. The derived metric is the rms power of the processed edge power spectrum. First, the need for a two-dimensional analysis is established, then a model is developed which predicts the results of a psychophysical raggedness experiment. Finally, several distorted edge types are processed in order to determine edge raggedness. The two-dimensional single channel approach is successful in predicting the relative raggedness, as a function of specific distortion parameters, for various distorted edge types. Further psychophysical testing is needed to establish the exact relationship between perceived raggedness and the rms power metric.
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Date: 1987-06

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