Method of reproducing gradations according to a ratio of fine pi

Details Method of reproducing gradations according to a ratio of fine pi Method of reproducing gradations according to a ratio of fine pi

1990-03-22

1991-12-24

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358459, H04N 123

Patent

active

050757806

ABSTRACT:
Disclosed is a method of reproducing gradations wherein a reference matrix pattern is configured by arranging a plurality of unit pixels like a matrix, each unit pixel is formed with a predetermined plurality of fine pixels, the fine pixels in number according to the gradations of an image signal are turned on, and the gradations are reproduced in accordance with the ratio of the fine pixels turned on to the fine pixels turned off in the reference matrix pattern, comprising steps of choosing the fine pixel to become a kernel, sequentially and alternatively growing the fine pixels adjacent to both sides of the fine pixel of the kernel therearound, and assigning serial ranks according to density of the image signal until all the fine pixels in the unit pixel are turned on at the region in which the image signal has the high density.

REFERENCES:
patent: 4531160 (1985-07-01), Ehn
patent: 4814886 (1989-03-01), Kuge et al.
patent: 4924301 (1990-05-01), Surbrook

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