Methods and apparatus for encoding and decoding images
US7450134B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2004 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Nov 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/70
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for generating images, compressing image data, decompressing image data, and processing the decompressed image data so that it can be used by a rendering circuit of a device, e.g., a set top box, are described. Images are generated in the native format used by the rendering circuit of the device which will ultimately control the display of the image avoiding the need to perform processing associated with converting color component information from one format to another. Uncompressed image data is arranged in a file with color component values being grouped separately from alpha values to facilitate compression by a standard file compression technique. The file is compressed using a conventional file compression operation. The compressed image file is decompressed when needed and the alpha data and color component data is reorganized so that the color component values and alpha value(s) corresponding to individual pixels are grouped together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.