Conversion of an analog image signal into a binary image signal

Details Conversion of an analog image signal into a binary image signal Conversion of an analog image signal into a binary image signal

1981-10-02

1985-01-29

Miller, C. D.

Facsimile and static presentation processing

Facsimile

Recording apparatus

340347AD, H03K 1300

Patent

active

044969872

ABSTRACT:
An image signal processing system for converting an analog image signal into a digital or binary image signal, capable of representing half-tone or gray scale when the corresponding visual image is reproduced by a dot-matrix type printer, is provided. The present system includes storing means for storing at least an array of thresholds, at least one of the thresholds being different in level from the other to form an array pattern. Such a threshold array is used as a reference level in producing a binary image signal. Half-tone is represented by the degree of black dot density per unit area.

REFERENCES:
patent: 4149194 (1979-04-01), Holladay
patent: 4185304 (1980-01-01), Holladay
patent: 4214277 (1980-07-01), Urich

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