Device and a method for encoding an image and corresponding decoding method and decoding device
US9681140B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2015 |
| Grant date | Jun 13, 2017 |
| Priority date | — |
| Expiry date | Dec 16, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for encoding an image represented in a perceptual color space is described. The image has at least a luminance component. The method includes transforming by a wavelet transform the luminance component to form at least one low frequency subband of wavelet coefficients, reconstructing a low frequency component for at least one spatial area of the low frequency subband, subtracting the reconstructed low frequency component from the wavelet coefficients of the spatial area, quantizing the wavelet coefficients of the spatial area responsive to the threshold, the threshold being proportional to the reconstructed low frequency component of the spatial area and encoding the quantized wavelet coefficients and the low frequency component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.