Image processing method and system

Details Image processing method and system Image processing method and system

1990-03-29

1992-05-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358451, H04M 140, H04M 1393

Patent

active

051172941

ABSTRACT:
A method for converting a first image of a first resolution to a second image of a second resolution comprises steps of detecting a predetermined pattern in the first image, the predetermined pattern contains a stepped boundary and includes at least a central picture element having a first content and formed by the first picture element, the central picture element is defined by a first edge extending in a first direction and a second edge extending in a second direction in corresponding to the step, dividing the central picture element into a first sub-picture element and a second sub-picture element each having a same size, and inverting the content of one of the first and second sub-picture elements depending on the detected predetermined pattern.

REFERENCES:
patent: 4280144 (1981-07-01), Bacon
patent: 4355337 (1982-10-01), Sekigawa
patent: 4873577 (1989-10-01), Chamzas
patent: 4975785 (1990-12-01), Kantor
patent: 5001576 (1991-01-01), Tanaka et al.

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