Snell & Wilcox Limited

Snell Limited

Avigdor Steinberg

Martin Weston

A video noise reducer divides a signal into spatial frequency bands and derives both recursively and non-recursively filtered signals for each band. Both signals are processed non-linearly. These signals are combined in ways that vary between the bands to provide a noise signal and a detail signal. A clean video signal with all noise removed is used in the recursive loop. The output signal includes detail enhancement and may have a subjectively pleasant amount of noise added back.

Video processing system and method with recursive and non-recursive filtering in separate high frequency bands

A video signal is enhanced using a non-linear combination of left and right difference signals (L and R), constrained to be zero if either L or R is zero, using a minimum absolute value function. Edge enhancement is provided when the polarities of L and R are the same and peak enhancement when the polarities are different. Difference signals are derived with delays (,and,) and a subtracter (,). The non-liner combinations are derived in a lookup table (,).

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Petersfield, United Kingdom

Avigdor Steinberg