Processing system with delta-based video data encoding
US5793427A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Oct 11, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for differential video data encoding which utilizes a reduced number of bits per pixel to encode chroma and luma components of a video data stream. A 4-bit absolute code is determined for a given 8-bit luma or chroma component in the data stream. The determined absolute code is indicative of a particular one of a plurality of ranges into which the given component falls. The given component is encoded using the determined absolute code if the absolute code produces a lower encoding error than a 4-bit delta code which encodes the component as a difference relative to a previously-encoded component. If the delta code produces a lower encoding error than the determined absolute code, the given component is encoded using the delta code. In a situation in which the given component is the first component of its type on a line of video, an absolute code may be used regardless of whether or not the absolute code produces a higher encoding error than the delta code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.