Image processing apparatus with back porch period sampling and c

Details Image processing apparatus with back porch period sampling and c Image processing apparatus with back porch period sampling and c

1992-11-09

1994-06-28

Groody, James J.

Television

Image signal processing circuitry specific to television

Dc insertion

348695, H04N 972

Patent

active

053251873

ABSTRACT:
An image processing apparatus adds a plurality of input digital chroma image data and input digital luminance image data during a back porch of the input image data and outputs average value data. A subtractor subtracts the average value data, from the input digital chroma image data and input digital luminance image data and outputs data, using a first subtracting method for the chroma image data and a second subtracting method, different from the first subtracting method, for the luminance image data. A memory stores the data output by the subtractor. The input digital chroma image data and the input digital luminance image data are sampled at a frequency an integral number of times as great as a frequency of a subcarrier, and are added.

REFERENCES:
patent: 4124869 (1978-11-01), Heitmann
patent: 4210933 (1980-07-01), Heitmann
patent: 4318126 (1982-03-01), Sassler
patent: 4562471 (1985-12-01), Eouzan et al.
patent: 4729011 (1988-03-01), McCann
Lever et al. "Analogue Processing and Operational Controls" IBA Tech Review (GB), No. 8 Sep. 1976.

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