Fixed-point quantizer for video coding

Details Fixed-point quantizer for video coding Fixed-point quantizer for video coding

2006-12-26

2006-12-26

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

07155472

ABSTRACT:
A quantizer employs a scaled integral inverse ratio division for quantization of an input T by a quantization step Q. The quantizer forms an integral approximation q of 2r/Q by either trunc(2r/Q) or round(2r/Q). A multiplier multiplies the absolute value of T by the q. An adjustment factor is added alternatively to the absolute value of T prior to multiplication or to the product after multiplication. This adjustment factor minimizes errors near transition points in the quantization. This invention is applicable to both trunc(T/Q) and round(T/Q).

REFERENCES:
patent: 6874007 (2005-03-01), Denk et al.
patent: 2004/0086192 (2004-05-01), Togashi et al.

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