US4668996A
Expired / Lapsed
US
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Method and apparatus for generating halftone dots
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1986-05-07
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Granted: 1987-05-26
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Expires: 2006-05-07
Abstract
Abstract A sub scanning line counter and a main scanning position counter count absolute record-scanning position. A halftone pattern memory outputs binary image output signals for resulting halftone dots in response to comparison of halftone dot density of a halftone pattern partial position previously related with the aboslute record-scanning position determined by count values of the sub scanning line counter and the main scanning position counter with density of the image input signal at that time. A preset value calculating circuit calculates, in case of starting record-scanning from the middle of the recording screen, the count value of the sub scanning line counter corresponding to the scanning start point in advance to starting scanning, thereby to preset the calculated value in the sub scanning line counter. Thus, in case of performing halftone processing in an image scanning/recording unit such as a composing scanner, continuous halftone dots can be generated in connected portions of a plurality of duplicate recorded images obtained by separately scanning a plurality of originals.
Inventors
- 👤 Fumihiro Hatayama
- 👤 Makoto Hirosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:36
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/387; H04N1/04; H04N1/047; H04N1/06; H04N1/0671; H04N1/0678; H04N1/40; H04N1/405; H04N1/4055; H04N1/4058; H04N2201/00; H04N2201/024; H04N2201/02406; H04N2201/02416; H04N2201/02439; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04715; H04N2201/04724; H04N2201/04727; H04N2201/04729; H04N2201/04731; H04N2201/04732; H04N2201/04734; H04N2201/04739; H04N2201/04753; H04N2201/04755; H04N2201/04791; H04N2201/04794
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A method of generating halftone dots along predetermined halftone patterns on the recording screen on the basis of input image signals for use in an image scanning/recording unit, said method comprising the steps of: previously relating scanning positions in recording with partial positions of halftone patterns; presetting, in case of generating halftone dots from the middle of the screen, a partial position of a halftone pattern corresponding to a scanning start position in the middle of the recording screen; and generating said halftone dots from said preset partial position in response to said relation.
Claim 2
Independent Claim
94 words
A method of generating halftone dots along predetermined halftone patterns on the recording screen on the basis of input image signals for use in an image scanning/recording unit, said method comprising the steps of: previously relating scanning positions in recording with partial positions of halftone patterns; presetting, in case of generating halftone dots from the middle of the screen, a partial position of a halftone pattern corresponding to a scanning start position in the middle of the recording screen; and generating said halftone dots from said preset partial position in response to said relation.
Claim 3
Dependent Claim
48 words
A method of generating halftone dots in accordance with claim 1, wherein said relating includes relating of the absolute sub scanning position obtained by counting a main scanning position and the number of sub scanning lines by counters with halftone dot density in said halftone pattern partial positions.
Claim 4
Dependent Claim
26 words
A method of generating halftone dots in accordance with claim 2, wherein said halftone patterns are cyclic and said counters are provided for the pattern cycles.
Claim 5
Dependent Claim
51 words
A method of generating halftone dots in accordance with claim 1, wherein said presetting includes presetting of the remainder of L n /L c assuming that L c represents the pattern repeating cycle line number in case of starting record-scanning from an L n -th scanning line from the scanning origin.
Claim 6
Dependent Claim
69 words
A method of generating halftone dots in accordane with claim 1, wherein said presetting includes presetting of the remainder of (L n -L r )/L c assuming that L c represents the pattern repeating cycle line number and L r represents the number of lines required for the rise of a scanning mechanism in case of starting record-scanning from an L n -th scanning line from the scanning origin.
Claim 7
Independent Claim
98 words
An apparatus for generating halftone dots along predetermined halftone patterns on the recording screen on the basis of input image signals for use in an image scanning/recording unit, said apparatus comprising: counters for relating scanning positions in recording with partial positions of halftone patterns; preset means for presetting an arbitrary partial position of a halftone pattern in the middle of the recording screen in said counters; and halftone dot generating means for generating halftone dots in response to said counters from said preset partial position in case of generating halftone dots from the middle of the recording screen.
Claim 8
Independent Claim
98 words
An apparatus for generating halftone dots along predetermined halftone patterns on the recording screen on the basis of input image signals for use in an image scanning/recording unit, said apparatus comprising: counters for relating scanning positions in recording with partial positions of halftone patterns; preset means for presetting an arbitrary partial position of a halftone pattern in the middle of the recording screen in said counters; and halftone dot generating means for generating halftone dots in response to said counters from said preset partial position in case of generating halftone dots from the middle of the recording screen.
Claim 9
Dependent Claim
26 words
An apparatus for generating halftone dots in accordance with claim 6, wherein said halftone patterns are cyclic and said counters are provided for pattern repeating cycles.
Claim 10
Dependent Claim
53 words
An apparatus for generating halftone dots in accordance with claim 7, wherein said preset means includes means for presetting the remainder of L n /L c assuming that L c represents the pattern repeating cycle line number in case of starting record-scanning from an L n -th scanning line from the scanning origin.
Claim 11
Dependent Claim
71 words
An apparatus for generating halftone dots in accordance with claim 7, wherein said preset means includes means for presetting the remainder of (L n -L r )/L c assuming that L c represents the pattern repeating cycle line number and L r represets the number of lines required for the rise of a scanning mechanusm in case of starting record-scanning from an L n -th scanning line from the scanning origin.
References Cited (Backward Citations)
US4327380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |