Method of performing NxM Discrete Cosine Transform
US7007055B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2002 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Nov 25, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F17/147
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A fast and precise method to perform inverse and forward Discrete Cosine Transform (DCT) is disclosed. The method may be used for implementing a two-dimensional (2D) inverse or forward DCT that operates on an N×M coefficient block and has a higher accuracy than is specified by the IEEE 1180-1990 standard (for the inverse operation). The disclosed method includes the following stages: based on integer operations, a fixed point one dimensional (1D) DCT may be performed on each row of an input coefficient block, an integer-to-single-precision floating point result conversion may be performed, and a single precision floating point 1D DCT may be performed on each column of the coefficient block resulting from the previous stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.