Method for generating and storing digitized density thresholds f

Details Method for generating and storing digitized density thresholds f Method for generating and storing digitized density thresholds f

1994-12-29

1995-11-21

Boudreau, Leo H.

Image analysis

Image enhancement or restoration

358536, 358456, G06K 940, H04N 140

Patent

active

054695163

ABSTRACT:
The object of the invention is a process for generating and storing digitized density thresholds for defining the grid of a half-tone image. The density thresholds of a section of a grid are stored in a data store as stored words depending on a spot function. In the grid section, several spots with a number of stored words form a multiple grid spot and are periodically arranged beside and above one another. A sorted sequence is found for the stored words of the section in accordance with the spot function. Density thresholds are allocated to the stored words depending on the position in the sorted sequence. The actual number of stored words is found individually for each spot in the section. The sorted sequence is generated according to the current spot function. Before position-dependent thresholds are allocated to the stored words, a center of concentration and possibly final point correction is performed for the spot concerned.

REFERENCES:
patent: 4115816 (1978-09-01), Moe et al.
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patent: 4499489 (1985-02-01), Gall et al.
patent: 4547812 (1985-10-01), Waller et al.
patent: 5022089 (1991-06-01), Wilson
patent: 5166809 (1992-11-01), Surbrook
Patent Abstracts of Japan, vol. 10, No. 379 (E-465), Jul. 31, 1986, "Picture Element Information Processing System", Tadao Shinya.

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