Image expansion apparatus

Details Image expansion apparatus Image expansion apparatus

1989-01-24

1990-01-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358180, 358451, 382 41, H04N 5262, H04N 1393

Patent

active

048917028

ABSTRACT:
An image expansion apparatus includes a FIFO-type image memory, writing and reading circuits for the image memory, and a plurality of cascade-connected delay circuits for sequentially delaying image data read out of the FIFO image memory. Image expansion in the main scanning direction is achieved by applying a delay to make the speed at which image data is read out of the FIFO image memory slower than that at which the image data is written in the FIFO image memory. Image expansion in the feed scanning direction is achieved by successively selecting and delivering outputs from delay circuits the number of which is equal to the magnification of the image.

REFERENCES:
patent: 4774581 (1988-09-01), Shiratsuchi
patent: 4792856 (1988-12-01), Shiratsuchi

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