Motion image coder using pre-filter to reduce quantization error

Details Motion image coder using pre-filter to reduce quantization error Motion image coder using pre-filter to reduce quantization error

1994-12-30

1997-11-11

Lee, Richard

Television

Bandwidth reduction system

Data rate reduction

348416, 348699, H04N 748, H04N 750

Patent

active

056869622

ABSTRACT:
A motion image coder is provided with a pre-filter for performing a pre-filtering which adaptively restricts the band for characteristics of the coded blocks. The pre-filtered result is used in determining quantization step size, thereby halving the quantization error causing a picture quality deterioration into a resolution error. Therefore, picture quality can be improved.

REFERENCES:
patent: 4731664 (1988-03-01), Nishiwaki et al.
patent: 5046071 (1991-09-01), Tanoi
patent: 5111293 (1992-05-01), Yamashita
patent: 5136376 (1992-08-01), Yagasaki et al.
patent: 5299019 (1994-03-01), Pack et al.
patent: 5406501 (1995-04-01), Florent
patent: 5418569 (1995-05-01), Ando

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