Highly efficient coding apparatus

Details Highly efficient coding apparatus Highly efficient coding apparatus

1990-02-20

1991-04-09

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

364725, H04N 7133

Patent

active

050069314

ABSTRACT:
A highly efficient coding apparatus for encoding digital video data in a block format and compressing the video data if required into a number of bits so that the total number of bits in the digital video data to be transmitted is less than that of a predetermined transmission capacity. Coefficient data having a DC component and a plurality of AC components for each block are generated by an orthogonal transformation. A distribution table of the AC coefficient data is generated during a predetermined period, and an accumulating distribution table is generated from the distribution table. The total bit number of the AC coefficient data generated during the predetermined period is controlled in response to the accumulating distribution table and the predetermined transmission capacity of the data transmission channel. The DC coefficient data, the controlled AC coefficient data and an additional code are transmitting for each of the predetermined periods.

REFERENCES:
patent: 4831440 (1989-05-01), Borgers
patent: 4833535 (1989-05-01), Ozeki
patent: 4931869 (1990-06-01), Amor
patent: 4941043 (1990-07-01), Jass
patent: 4953018 (1990-08-01), Martens

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