Process and apparatus for reducing a picture with fine line disa

Details Process and apparatus for reducing a picture with fine line disa Process and apparatus for reducing a picture with fine line disa

1989-03-20

1990-05-29

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358454, 358445, H04N 1393

Patent

active

049300210

ABSTRACT:
A process for reducing a picture by determining monochrome data of converted picture pixels according to logic calculations based on monochrome data of original picture pixels by using divisional regions of a picture area according to a reduction rate, for avoiding disappearance of fine lines from the converted picture. The process includes the steps of: successively receiving monochrome data of original picture pixels in the vicinity of a converted picture pixel; producing data of a line susceptible to disappearance, such data being necessary for detecting pixels along a line in the converted picture which could disappear from the converted picture due to picture conversion; discriminating regions in which the converted picture pixels are located; calculating monochrome data of a converted picture pixel based on the generated data a line susceptible to disappearance, data of discrimination of regions in which the converted picture pixels are located, and monochrome data of the original picture pixels; and producing a signal indicating the monochrome data of the converted picture pixel according to the calculation of monochrome data of the converted picture pixel.

REFERENCES:
patent: 4275450 (1981-06-01), Potter
patent: 4682243 (1987-07-01), Hatayama
patent: 4734785 (1988-03-01), Takei et al.
patent: 4814894 (1989-03-01), Yoshida
patent: 4827353 (1989-05-01), Ehlers et al.

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