Apparatus for reducing the resolution of video samples by trunca

Details Apparatus for reducing the resolution of video samples by trunca Apparatus for reducing the resolution of video samples by trunca

1985-03-25

1987-03-31

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358133, 358140, H04N 1120, H04N 701

Patent

active

046546952

ABSTRACT:
A pix-in-pix television display, with a digital memory for holding samples representing one field of the small picture, includes circuitry for converting eight-bit luminance samples into five-bit samples for efficient storage in the digital memory. A subtracter subtracts a predetermined block level bias value from each sample and an adder adds a two bit psuedo-random dither value to each sample. The six most significant bits of these samples are applied to a limiter which changes the samples having values greater than thirty-one to have values of thirty-one. The five-bit luminance samples are obtained by taking the five least significant bits of the samples provided by the limiter.

REFERENCES:
patent: 4015286 (1977-03-01), Russell
patent: 4298891 (1981-11-01), Baba et al.
patent: 4340940 (1982-07-01), Williams, Jr. et al.
patent: 4349913 (1982-09-01), Skoog
patent: 4352123 (1982-09-01), Flamm
patent: 4524447 (1985-06-01), Willis et al.
patent: 4543599 (1985-09-01), Willis et al.
U.S. Appln. Ser. No. 498,151, Entitled "Digital Signal Processing Apparatus Having Digital/Dither", D. H. Willis, FLD. 5-25-83.
Discrete-Time Systems, An Introduction with Interdisciplinary Applications, by James A. Cadzow, Prentice Hall, 1973.

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