Predictive sub-band video coding and decoding using motion compe

Details Predictive sub-band video coding and decoding using motion compe Predictive sub-band video coding and decoding using motion compe

1996-10-24

1998-07-07

Tung, Bryan

Television

Bandwidth reduction system

Data rate reduction

348401, 348415, H04N 732

Patent

active

057776784

ABSTRACT:
A method and apparatus for sub-band encoding an input signal in which ringing may be diminished. When performing a number of wavelet transform operations by sub-band encoding, filtering the of signals is done with a small number of taps with increased number of times of spectrum splitting so far made on the signals. That is, filters with a larger number of taps are used for initial-stage frequency spectrum splitting for avoiding step-like patterns from being produced due to deterioration of low-frequency components. With increased number of times of frequency spectrum splitting, filters with a smaller number of taps are used for preventing the relative number of taps from being increased due to downsampling for suppressing picture ringing to a minimum.

REFERENCES:
patent: 5398067 (1995-03-01), Sakamoto
patent: 5495292 (1996-02-01), Zhang et al.
patent: 5506687 (1996-04-01), Gillard et al.
patent: 5537493 (1996-07-01), Wilkinson
patent: 5592228 (1997-01-01), Dachiku et al.

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