Pre-oddification

Details Pre-oddification Pre-oddification

1996-01-11

1998-10-13

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348419, 348718, 348398, H04N 712, H04N 1102, H04N 1104, H04N 964

Patent

active

058220054

ABSTRACT:
Pre-oddification of quantized discrete cosine transform (DCT) coefficients representing video data reduces high frequency noise that accumulates over multiple stages of encoding/decoding due to oddification in the decoders. The quantized DCT coefficients are inverse quantized, and the resulting inverse quantized coefficients are summed. If the sum is even, then the energy accumulation at that coefficient. The last quantized coefficient may be set to zero, or may be incremented/decremented by "1" in the opposite manner than oddification occurs in the decoders. Further the values of a quantization matrix may be set, either manually or automatically as a function of the complexity of the video data, to assure that it is possible for the sum of the inverse quantized coefficients to be odd.

REFERENCES:
patent: 4807033 (1989-02-01), Keesen et al.
patent: 5218650 (1993-06-01), Blonstein et al.
patent: 5481553 (1996-01-01), Suzuki et al.
patent: 5515105 (1996-05-01), Lim

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