Reproduction picture sharpness emphasizing method and apparatus

Details Reproduction picture sharpness emphasizing method and apparatus Reproduction picture sharpness emphasizing method and apparatus

1988-07-13

1989-07-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 75, H04N 140, H04N 146

Patent

active

048442887

ABSTRACT:
Apparatus for reproducing a scanned picture with sharpness emphasized. A scanner is provided for scanning a picture to be reproduced in two directions perpendicular to one another and for generating and recording signals representing the scanned picture. There is a sharpness emphasizing device for summing and averaging a plurality of picture element signals aligned in one of the scanning directions in the vicinity of a scanning point in the picture being scanned and recorded to generate values and then summing and averaging a plurality of the resulting summed and averages picture signals aligned in the other scanning direction in the vicinity of said scanning point to generate further values and then producing a recording signal equal to S+k(S-U), where k is a constant chosen to enhance a particular characteristic of the scanned picture, S is the sharp signal component at said scanning point and U is a generated unsharp signal. Finally, there is a device for receiving the recording signal and for employing it to reproduce the scanned picture.

REFERENCES:
patent: 4237481 (1980-12-01), Aughton
patent: 4319268 (1982-03-01), Yamada
patent: 4484232 (1984-11-01), Gass
patent: 4586089 (1986-04-01), Nakazato et al.

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