Bilevel coding of color video signals

Details Bilevel coding of color video signals Bilevel coding of color video signals

1982-12-03

1985-07-09

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 13, H04N 932

Patent

active

045285845

ABSTRACT:
Bilevel coding of color video signals, for example video teleconference or NTSC broadcast television signals, is used to reduce the required storage capacity or transmission channel bandwidth. Each multi-level or continuous tone picture element in a frame is compared to a threshold and assigned one of two values depending upon whether or not it exceeds the threshold value. The threshold is produced by averaging the luminance components of neighboring picture elements and constraining the average by a signal derived from the chrominance of the original video signal. A significant feature is that the use of the chrominance signal in this way obviates the need, common to known monochrome systems, of adding noise (or dither signal) to the signal with concomitant picture degrading artifacts.

REFERENCES:
patent: 4467346 (1984-08-01), Mori

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