Method of and system for reproducing or transmitting half-tone i

Details Method of and system for reproducing or transmitting half-tone i Method of and system for reproducing or transmitting half-tone i

1980-04-24

1982-07-27

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, H04N 104, H04N 122

Patent

active

043420516

ABSTRACT:
An original image field is successively scanned along each of parallel line paths to detect the image density of the scanned elemental picture area. A plurality of recurring sequences of binary digits or pulses is generated for each of the scanned line paths in synchronism with the scansion of each elemental picture area, thereby forming dot pattern conversion matrices corresponding in number to the number of discrete gradation steps or image densities with the pulses representing the dots in each matrix. The detected image density is used to select a corresponding one of the dot pattern matrices to represent the scanned area with a dot if the latter is present in a specified position in the corresponding matrix by allowing the selected recurring pulse sequence to be delivered to a recording unit which is moved with respect to a recording field in synchronism with the scansion of the original field.

REFERENCES:
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patent: 3689693 (1972-09-01), Cahill et al.
patent: 3922484 (1975-11-01), Keller
patent: 3977007 (1976-08-01), Berry et al.
patent: 4084259 (1978-04-01), Cahill et al.
patent: 4184206 (1980-01-01), Harano
patent: 4210936 (1980-07-01), Cinque et al.
patent: 4240118 (1980-12-01), Wellendorf et al.
patent: 4258393 (1981-03-01), Ejiri et al.
Klensch et al., "Electronically Generated Halftone Pictures", RCA Review, Sep. 1970, pp. 517-533.
Stucki, "Optimal Digital Halftone Pattern Generation Method", IBM _Tech. Disc. Bulletin, vol. 17, No. 9, Feb. 1975, pp. 2779-2780.
Gupta, "Production of Pseudo-Halftone Images", IBM Tech. Disc. Bulletin, vol. 19, No. 1, Jun. 1976, pp. 290-291.
Machol, "Peudo Halftone for Representating Continuous Tone Images in Black-White Facsimile Systems", IBM Tech. Disc. Bulletin, vol. 9, No. 6, 11/66, pp. 636-637.

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