Image display unit capable of tone reproduction

Details Image display unit capable of tone reproduction Image display unit capable of tone reproduction

1984-12-06

1986-11-11

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 358283, H04N 140, H04N 121, H04N 123

Patent

active

046225951

ABSTRACT:
An image reproducing apparatus wherein a halftone of an image is reproduced by repeating a picture element pattern composed of a plurality of dots as a unit and each dot display density of which is gradually controlled. The repetition of the same picture element patterns is avoided to improve tone reproducing performance.
The image display unit includes a means for determining a disposition of dots composing a specific picture element pattern, i.e., display density of each dot in response to tone density of the original image, a means for comparing the disposition of dots of the specific picture element pattern determined by said means with a dot disposition or dispositions of one or plural surrounding picture element pattern or patterns, and a means for changing the dot disposition of said specific picture element pattern in the case when it is identical with dot dispositions of a predetermined number or more of surrounding picture element patterns.

REFERENCES:
patent: 3916096 (1975-10-01), Everett et al.
patent: 4245258 (1981-01-01), Holladay
patent: 4389677 (1983-06-01), Rushby et al.
patent: 4485397 (1984-11-01), Scheuter et al.
patent: 4491875 (1985-01-01), Kawamura
Tokunaga, Yukio, "New Gray-Scale Printing Method Using a Thermal Printer", IEEE Transactions on Electron Devices, vol. ED-30, No. 8, Aug. 1983.

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