EP0235631A2
Expired / Lapsed
EP
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Method of forming halftone screen
Assignee: Fujifilm Holdings Corp
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Filing: 1987-02-12
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Granted: —
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Expires: 2007-02-12
Abstract
Abstract A halftone dot image is produced by superposing image information produced by scanning an original on a halftone screen composed of a plurality of scanning lines constituted by electrically generated halftone screen signals and arranged side by side in a direction normal to a scanning direction in which the scanning lines extend. Each of dots of the halftone screen is formed with an integral number of scanning lines commensurate with a screen angle of the halftone screen. The halftone screen signals are equalized in level at mutually corresponding areas in the respective dots.
Inventors
- 👤 Masahiro Fuji Photo Film Co. Ltd. Inoda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 12:34
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4055; H04N1/4058; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
A method of forming a halftone screen in producing a halftone dot image by superposing image information produced by scanning an original on the halftone screen composed of a plurality of scanning lines constituted by electrically generated halftone screen signals and arranged side by side in a direction normal to a scanning direction in which the scanning lines extend, said method comprising the steps of: forming each of dots of said halftone screen with an integral number of scanning lines commensurate with a screen angle of the halftone screen; and equalizing the halftone screen signals in level at mutually corresponding areas in the respective dots.
Claim 2
Independent Claim
105 words
A method of forming a halftone screen in producing a halftone dot image by superposing image information produced by scanning an original on the halftone screen composed of a plurality of scanning lines constituted by electrically generated halftone screen signals and arranged side by side in a direction normal to a scanning direction in which the scanning lines extend, said method comprising the steps of: forming each of dots of said halftone screen with an integral number of scanning lines commensurate with a screen angle of the halftone screen; and equalizing the halftone screen signals in level at mutually corresponding areas in the respective dots.
Claim 3
Independent Claim
33 words
A method according to claim l, wherein the number of scanning lines is selected so as to pass through areas of the dots where the halftone screen signals are of a maximum level.
Claim 4
Independent Claim
77 words
A method according to claim l, wherein the halftone screen is composed of a repeated pattern of minimum basic periodic portions, the number α of scanning lines which constitute each of said basic periodic portions being selected on the following equation: where ϑ is the screen angle, γ is the number of scanning lines disposed between closest vertexes of a square dot with respect to said direction normal to the scanning direction, and m is an integer.
Claim 5
Dependent Claim
62 words
A method according to claim 1, wherein the halftone screen is composed of a repeated pattern of minimum basic periodic portions, the number α of scanning lines which constitute each of said basic periodic portions being selected on the following equation: where ϑ is the screen angle, β is the number of scanning lines constituting a dot, and m is an integer.
References Cited (Backward Citations)
No citation records indexed.
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