Patent · US Expired

Method and apparatus for selectible quantization in an encoder

US7058677B1 · kind B1 · utility

5Cited by
13References
16Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJul 17, 2001
Grant dateJun 6, 2006
Priority date
Expiry dateMar 11, 2022

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04N19/61
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

A method for selectable quantization for use in an encoder for compressing video and/or audio data includes processing that begins by receiving discrete cosine transform data of an encoded signal. The processing continues by obtaining a quantization table. The processing then continues by obtaining a plurality of scaling factors. The process then continues by generating a plurality of quantized value sets of the discrete cosine transform data based on the quantization table and the plurality of quantization scaling factors. The resulting data is then multiplied separately by each of the quantization scaling factors to produce the plurality of quantized values sets. The process then continues by selecting one of the plurality of quantized value sets based on quantization selection criteria.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.