Bilevel coding of colour video signals

Details Bilevel coding of colour video signals Bilevel coding of colour video signals

H - Electricity

04

N

350/33, 350/41

H04N 9/64 (2006.01)

Patent

CA 1192997

BILEVEL CODING OF COLOUR VIDEO SIGNALS Abstract of the Disclosure Bilevel coding of colour 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 neighbouring 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. - 1-

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