Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-09-24
1991-06-04
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, 358136, H04N 718, H04N 712
Patent
active
050218794
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 sub-blocks, i.e. they are combined to still larger units. When transmitting stationary pictures, a very effective encoding is the result.
REFERENCES:
patent: 4460923 (1984-07-01), Hirano et al.
patent: 4591907 (1986-05-01), Catros
patent: 4689671 (1987-08-01), Ohki et al.
patent: 4723161 (1988-02-01), Koza
patent: 4731664 (1988-03-01), Nishiwaki et al.
Goodman Edward W.
Peng John K.
U.S. Philips Corporation
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