Method for encoding a matrix, in particular a matrix representative of a still or video image, using a wavelet transform, with numbers of wavelet levels that vary according to the image and different quantization factors for each wavelet level
US9992495B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2014 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | May 28, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/635
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An encoding method for encoding successive layers of an initial matrix into a compressed matrix and restoring it as a restored matrix, each cell of the initial matrix containing a respective initial numerical value; each cell of the compressed matrix containing a respective compressed numerical value corresponding to the respective initial numerical value; each cell of the restored matrix containing a respective restored numerical value corresponding to the respective initial numerical value; is characterized in that to encode, one applies: —wavelet transforms applied to the entire matrix over a limited number of levels, such that a residual level remains with dimensions larger than or equal to 2×2; then, a differential encoding of the residual level, i.e., a compression of the residual level by obtaining differences with each of the values of the residual level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.