Method and apparatus for compensating quantization errors of a d

Details Method and apparatus for compensating quantization errors of a d Method and apparatus for compensating quantization errors of a d

1997-08-28

1999-08-31

Coles, Edward L.

Image analysis

Image enhancement or restoration

Image filter

382233, 382264, 348403, G06T 500

Patent

active

059464216

ABSTRACT:
An encoded video signal is decoded to obtain a decoded video signal, wherein the decoded video signal includes a previous and a current frames and is processed an a macroblock-by-macroblock basis, each frame's data containing pixel values, by deriving a set of quantized discrete cosine transform coefficients corresponding to current frame data and converting the set of quantized discrete cosine transform coefficients into a set of discrete cosine transform coefficients. Thereafter, depending on the complexity of the current frame data detected, high frequency components of the set of discrete cosine transform coefficients within a preset region are filtered based on the set of discrete cosine transform coefficients and the complexity of the current frame data, to thereby produce a set of filtered discrete cosine transform coefficients. The set of filtered discrete cosine transform coefficients is transformed into a set of inverse discrete cosine transform data, and the current frame data is generated through the use of motion compensation and provided as the decoded video signal.

REFERENCES:
patent: 5475434 (1995-12-01), Kim
patent: 5598213 (1997-01-01), Chung et al.
patent: 5610729 (1997-03-01), Nakajima
patent: 5737451 (1998-04-01), Gandhi et al.

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