Visual fidelity criterion and modeling

Fidelity measures and criteria for visual communications are discussed. It is recognized that the basis of visual fidelity assessment is subjective judgement of reproduced pictures. However, in design and elsewhere there is also need for explicit evaluation of visual communication waveforms. The rat...

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Bibliographic Details
Published in:Proceedings of the IEEE 1972-01, Vol.60 (7), p.771-779
Main Author: Budrikis, Z.L.
Format: Article
Language:English
Subjects:
Attenuation
Band pass filters
Distortion measurement
Feeds
Filtering
Noise measurement
Quantization
Rate distortion theory
Testing
Visual communication
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Summary:Fidelity measures and criteria for visual communications are discussed. It is recognized that the basis of visual fidelity assessment is subjective judgement of reproduced pictures. However, in design and elsewhere there is also need for explicit evaluation of visual communication waveforms. The rate distortion theory model for such evaluations is brought out and two existing evaluations of limited scope, viz., weighted noise measurement and K rating, are reviewed in relation to that theory. It is suggested that video distortion can largely be identified with visibility of errors in reproduction. Relevant findings on luminance vision are examined. It is found that a comprehensive model of visibility would incorporate excitation, inhibition, and masking, and that considerable quantitative knowledge of these factors already exists. Looking ahead, a block schematic is given of a meter which might measure distortion produced by quantization noise in a video feed back quantizer.
ISSN:0018-9219
1558-2256
DOI:10.1109/PROC.1972.8776