Method for decoding a digital image, coding method, devices, and associated computer programs
US10771817B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2017 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Apr 5, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/184
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for decoding a current block of a digital image. The method includes: decoding coefficients of the current block; and transforming the current block into a decoded block, by implementing a first sub step to produce an intermediate block, that applies to the column and row vectors of the current block, and a second substep to produce a block of pixels that applies to the row and column vectors of the intermediate block, resulting from the first substep; and rebuilding the image from the decoded block. At least one of the first and second substeps includes, for an input row or column vector: forming a first subvector of size K<N or N respectively from adjacent elements of the input vector; transforming the first subvector into a first transformed subvector by applying a partial subtransform of size K×K; and building the transformed vector by inserting the first transformed subvector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.