Digital data transmitting apparatus

Details Digital data transmitting apparatus Digital data transmitting apparatus

1992-09-25

1995-05-16

Ro, Bentsu

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

3582613, 358427, 358433, 358524, 382232, H04N 730

Patent

active

054166152

ABSTRACT:
A digital data transmitting apparatus comprises: an original block forming circuit for extracting image data in horizontal direction and/or vertical direction at intervals of a predetermined number of samples and forming an original block consisting of (n.times.n) pixel data; a differential block forming circuit for forming a differential block consisting of (m.times.m) pixel data with differential data between adjacent pixel data in horizontal and/or vertical direction and the pixel data concerned; a coding circuit for transform coding the original block and the differential block, respectively; a flag generation circuit for transmitting meaningful data of coefficient data generated by transform coding the differential block and generating a flag representing omission of the transmission of coefficient data where there is no meaningful data; and a transmission circuit for transmitting the flag and the pixel data of each of the block.

REFERENCES:
patent: 4941194 (1990-07-01), Shimura
patent: 4972473 (1990-11-01), Ejiri et al.
patent: 5086489 (1992-02-01), Shimura
patent: 5140417 (1992-08-01), Tanaka et al.
patent: 5249066 (1993-09-01), Fukuda et al.

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