2-D transforms for image and video coding
US7242713B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2003 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Jul 22, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F17/147
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A set of one and two-dimensional transforms is constructed subject to certain range limited constraints to provide a computationally efficient transform implementation, such as for use in image and video coding. The constraints can include that the transform has a scaled integer implementation, provides perfect or near perfect reconstruction, has a DCT-like basis, is limited to coefficient within a range for representation in n-bits (e.g., n is 16 bits), has basis functions that are close in norm, and provides sufficient headroom for overflow of the range. A set of transforms is constructed with this procedure having an implementation within a 16-bit integer range for efficient computation using integer matrix multiplication operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.