Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-09-11
1980-04-29
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358260, 375 28, H04N 712
Patent
active
042008867
ABSTRACT:
A method for transmitting video signals by differential pulse code modulation employing an adjustable quantizer which can be switched between different quantizing characteristics, by deriving the control criterion for switching the quantizer from the quantized prediction errors based on picture elements adjacent the picture element being quantized, providing the quantizer with a large number of available quantizing representative levels and employing a selected number of those levels, less than the total available, for each quantizing characteristic, and, omitting those representative quantizing levels of the quantizer, for which the spacing between the representative levels is less than twice the associated maximum permissible quantizing error belonging to the respective quantized prediction errors and providing representative levels at the outer ends of the quantizing characteristic instead of the omitted levels.
REFERENCES:
patent: 4023199 (1927-05-01), Netravali et al.
T. Kummerow, "A DPCM System with Two-Dimensional Predictor and Controlled Quantizer," 4-4-73, pp. 425-439.
D. J. Connor, et al., "TV Coding Using Two Dimensional Spatial Prediction," Bell System Tech. Journal, vol. 50, (1971), pp. 1049-1061.
W. Thomas, "Optimizing the DPCM for Video Signals Using a Model of the Human Visual System," 1974, Zurich Seminar Conf., pp. C3(1)-C3 (7).
J. C. Candy et al., "Methods for Designing Differential Quantizers Based on Subjective Evaluations of Edge Busyness," Bell Journal, vol. 51, (1972), pp. 1495-1516.
Erdmann Wolf-Dieter
Musmann Hans-Georg
Coles Edward L.
Griffin Robert L.
LICENTIA Patent-Verwaltungs-G.m.b.H.
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