Methods and apparatus for transform coefficient filtering
US7162097B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2001 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Dec 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
According to the present invention, methods and apparatus for filtering transform coefficients are provided. Transform coefficients associated with an input bit sequence can be zeroed to provide modified transform coefficients associated with an output bit sequence. The transform coefficients may represent information in a portion of data such as a video frame, a picture, or an audio stream. In one example, the transform coefficients are DCT coefficients of an MPEG-2 video sequence. The transform coefficients are filtered to provide modified transform coefficients associated with an output bit sequence. The output bit sequence is a rescaled version of the input bit sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.