System for transmitting video pictures
US5021879A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Sep 24, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for transmitting video pictures includes a hybrid encoder which encodes the incoming data of a video picture in blocks. Preferably, at the receiver end a hybrid decoder cancels the encoding steps of the hybrid encoder. The incoming blocks of a video picture are transformed inter alia by a transform unit (T) and quantized by a quantizer (Q). In order to adapt the system to transmission bit rates of between 64 kbit/s and 2 Mbit/s in an optimum manner, a structuring unit (SE) is provided which combines a plurality of blocks, which represent a coherent section of a video picture, to one macro-block. It assigns a macro-attribute to each macro-block from which attribute it can be derived which properties are identical for all sub-blocks of the macro-blocks and which are not. Such properties are, for example, records about the motion vector of each sub-block, which vector may be the same, for example, for all sub-blocks. When using a separate macro-attribute (NON), there is no property which can be considered to be the same for all sub-blocks of a macro-block, but the properties are assigned to each sub-block proper. If required, the macro-blocks themselves are again treated as s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.