Methods and apparatus for encoding and decoding video data
US7634146B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 2004 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Jan 13, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/93
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
According to aspects of embodiments of the invention, a method of encoding a sequence of frames of image data, each frame including a number of lines of pixels equal to a frame height, and each line having a number of pixels equal to a line length, comprises: encoding as an encoded symbol stream a sequence of pixels of a frame without including an end-of-line code after each line; identifying as a run having a run length, a sequence of pixels having values less than a threshold; and encoding the run using digit encoding. According to other aspects, the digit encoding may further comprise: identifying a set of most frequently used symbols; assigning a symbolic digit to each of the set of most frequently used symbols; assigning a start symbol; and encoding using digit encoding may include inserting in the encoded symbol stream the start symbol; and inserting in the encoded symbol stream after the start symbol a sequence of symbolic digits identifying the run length of the run. The method may yet further comprise: assigning an end symbol; and inserting the end symbol in the encoded symbol stream after the sequence of symbolic digits. According to yet another variation, the method may …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.