US4870505A
Expired / Lapsed
US
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Method of and apparatus for connecting output image signals from a plurality of line image sensors using a correction read pattern
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1988-03-21
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Granted: 1989-09-26
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Expires: 2008-03-21
Abstract
Abstract An amount of a read position error in the subscanning direction between line image sensors (for example, CCD1, CCD2, CCD3) is obtained by initially scanning and reading a correction read pattern (6a, 6b). In scanning of an original, output image signals from the line image sensors (CCD1, CCD2, CCD3) are relatively delayed by a line number corresponding to the amount of the read position error between the line image sensors (CCD1, CCD2, CCD3), to correct time difference, caused by the read position error, in information reading in the boundary portion of the line image sensors. An arrangement of line memories is also provided for correcting angular deviations of the line image sensors.
Inventors
- 👤 Kiyoomi Mitsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/19; H04N1/1903; H04N1/047; H04N1/191; H04N1/192; H04N1/193; H04N1/1934; H04N2201/00; H04N2201/024; H04N2201/02406; H04N2201/02425; H04N2201/02439; H04N2201/02441; H04N2201/028; H04N2201/03; H04N2201/031; H04N2201/03104; H04N2201/0315; H04N2201/03162; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/04703; H04N2201/04715; H04N2201/0472; H04N2201/04729; H04N2201/04731; H04N2201/04732; H04N2201/04753; H04N2201/04758; H04N2201/04787; H04N2201/04789; H04N2201/04791; H04N2201/04793; H04N2201/04794; H04N2201/04796
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
250 words
A method of associating output image signals from a plurality of line image sensors, said sensors being arrayed along a main scanning line extending in a main scanning direction for scanning an original and obtaining image information, said method correcting any errors in the respective read positions of respective said line image sensors in a subscanning direction transverse to said main scanning direction, said method comprising the steps of: previously preparing a correction read pattern at least having a first pattern in which a subscanning direction coordinate of each portion of said first pattern is uniquely determinable with respect to a main scanning direction coordinate; placing said correction read pattern on a scanning plane, with a respective portion of said correction read pattern being adjacent to each of said line image sensors, in at least two points, for being scanned thereby; scanning said first pattern with said line image sensors, and determining an amount of a read position error in the subscanning direction between individual ones of said plurality of line image sensors, based on read pixel addresses detected by respective said line image sensors by said scanning of said first pattern by respective said line image sensors; and scanning said original, and asociating said output image signals from respective said line image sensors, by relatively delaying said output image signals with respect to each other as a function of a respective line number corresponding to any such read position error in the subscanning direction between said line image sensors.
Claim 2
Independent Claim
250 words
A method of associating output image signals from a plurality of line image sensors, said sensors being arrayed along a main scanning line extending in a main scanning direction for scanning an original and obtaining image information, said method correcting any errors in the respective read positions of respective said line image sensors in a subscanning direction transverse to said main scanning direction, said method comprising the steps of: previously preparing a correction read pattern at least having a first pattern in which a subscanning direction coordinate of each portion of said first pattern is uniquely determinable with respect to a main scanning direction coordinate; placing said correction read pattern on a scanning plane, with a respective portion of said correction read pattern being adjacent to each of said line image sensors, in at least two points, for being scanned thereby; scanning said first pattern with said line image sensors, and determining an amount of a read position error in the subscanning direction between individual ones of said plurality of line image sensors, based on read pixel addresses detected by respective said line image sensors by said scanning of said first pattern by respective said line image sensors; and scanning said original, and asociating said output image signals from respective said line image sensors, by relatively delaying said output image signals with respect to each other as a function of a respective line number corresponding to any such read position error in the subscanning direction between said line image sensors.
Claim 3
Dependent Claim
120 words
A method in accordance with claim 1, further including the steps of: determining an amount of angle deviation of each of said plurality of line image sensors, based on said read pixel addresses detected by respective said line image sensors by said scanning of said first pattern by respective said line image sensors, as a function of a scanning line number unit, and performing correction of the angle deviation of relatively delaying said output image signals from respective said line image sensors sequentially by one line per A/n pixels (where A represents an effective pixel number of a respective one of said line image sensors and n represents said line number of the angle deviation), in scanning of said original.
Claim 4
Dependent Claim
50 words
A method in accordance with claim 2, wherein said step of performing correction of the angle deviation includes steps of: producing image signals obtained by delaying said output image signals of respective said line image sensors by 0 to n lines, and selecting said produced image signals every A/n pixels.
Claim 5
Dependent Claim
89 words
A method in accordance with claim 1, wherein said plurality of line image sensors are arrayed so that their respective adjacent read positions partially overlap with each other, and said correction read pattern further has a second pattern extending in said subscanning direction, said method further including a step of associating pixels of adjacent line image sensors in the main scanning direction to obtain connected image information, by making respective pixel addresses detected in reading of said second pattern by said adjacent line image sensors identical to each other.
Claim 6
Dependent Claim
23 words
A method in accordance with claim 4, wherein said first and second patterns are each formed by at least one respective thin line.
Claim 7
Independent Claim
244 words
An apparatus for associating output image signals from a plurality of line image sensors, said sensors being arrayed along a main scanning line extending in the main scanning direction for scanning an original and obtaining image information, by correcting any errors in the respective read positions of respective said line image sensors in a subscanning direction transverse to said main scanning direction, said apparatus comprising: a correction read pattern at least having a first pattern in which a subscanning direction coordinate of each portion of said first pattern is uniquely determinable with respect to a main scanning direction coordinate, said correction read pattern being disposed on a scanning plane, with a respective portion of said correction read pattern being adjacent to each of said line image sensors, in at least two points, for being scanned thereby; means for determining an amount of a read position error in the subscanning direction between individual ones of said plurality of line image sensors, based on read pixel addresses detected by respective said line image sensors, respective to scanning of said first pattern by respective said line image sensors; and means for associating said output image signals from respective said line image sensors, by relatively delaying said output image signals with respect to one another as a function of a line number corresponding to any such read position error in the subscanning direction between individual ones of said line image sensors, in response to scanning of said original.
Claim 8
Independent Claim
244 words
An apparatus for associating output image signals from a plurality of line image sensors, said sensors being arrayed along a main scanning line extending in the main scanning direction for scanning an original and obtaining image information, by correcting any errors in the respective read positions of respective said line image sensors in a subscanning direction transverse to said main scanning direction, said apparatus comprising: a correction read pattern at least having a first pattern in which a subscanning direction coordinate of each portion of said first pattern is uniquely determinable with respect to a main scanning direction coordinate, said correction read pattern being disposed on a scanning plane, with a respective portion of said correction read pattern being adjacent to each of said line image sensors, in at least two points, for being scanned thereby; means for determining an amount of a read position error in the subscanning direction between individual ones of said plurality of line image sensors, based on read pixel addresses detected by respective said line image sensors, respective to scanning of said first pattern by respective said line image sensors; and means for associating said output image signals from respective said line image sensors, by relatively delaying said output image signals with respect to one another as a function of a line number corresponding to any such read position error in the subscanning direction between individual ones of said line image sensors, in response to scanning of said original.
Claim 9
Dependent Claim
119 words
An apparatus in accordance with claim 6, further including: means for determining an amount of angle deviation of each of said plurality of line image sensors, based on read pixel addresses detected by respective said lime image sensors in scanning of said first pattern by respective said line image sensors, as a function of a scanning line number unit, and means for performing correction of the angle deviation by relatively delaying said output image signals from respective said line image sensors sequentially by one line per A/n pixels (where A represents an effective pixel number of a respective one of said line image sensors and n represents said line number of the angle deviation), in scanning of said original.
Claim 10
Dependent Claim
52 words
An apparatus in accordance with claim 7, wherein said means for performing correction of the angle deviation includes: means for producing image signals obtained by delaying said output image signals of respective said line image sensors by 0 to n lines, and means for selecting said produced image signals every A/n pixels.
Claim 11
Dependent Claim
88 words
An apparatus in accordance with claim 6, wherein said plurality of line image sensors are arrayed so that their respective adjacent read positions partially overlap with each other, and said correction read pattern further has a second pattern extending in the subscanning direction, said apparatus further including means for associating pixels of adjacent line image sensors in the main scanning direction to obtain connected image information, by making respective pixel addresses detected in reading of said second pattern by said adjacent line image sensors identical to each other.
Claim 12
Dependent Claim
23 words
An apparatus in accordance with claim 9, wherein said first and second patterns are each formed by at least one respective thin line.
Claim 13
Dependent Claim
83 words
An apparatus in accordance with claim 6, wherein said means for associating said output image signals from respective said line image sensors includes: storage means for storing said output image signals, and means for addressing write and read addresses of said storage means so that said output image signals read from said storage means are relatively delayed for respective ones of said line image sensors by a respective line number corresponding to said amount of the read position error in the subscanning direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |