Method and apparatus for compressing and decompressing data
US9699470B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 2016 |
| Grant date | Jul 4, 2017 |
| Priority date | — |
| Expiry date | Nov 2, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus are provided for compressing and decompressing image data by producing two sets of reduced size image data, generating a modulation value for each elementary of the area from the image data, the modulation value encoding information about how to combine the sets of reduced size image data to generate an approximation to the image. In one arrangement, a set of index values is generated corresponding to a set of modulation values for each of the respective elementary areas of a group of elementary areas and these are assigned to each respective group and a second set of index values corresponding to one of the set of first index values for each elementary areas is assigned to each first group of elementary areas. These index values are stored for use in deriving modulation data more accurately when decompressing the image data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.