US20050225812A1 - Two-dimensional CMOS sensor array to image documents and other flat objects - Google Patents

Two-dimensional CMOS sensor array to image documents and other flat objects Download PDF

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Publication number
US20050225812A1
US20050225812A1 US10/821,821 US82182104A US2005225812A1 US 20050225812 A1 US20050225812 A1 US 20050225812A1 US 82182104 A US82182104 A US 82182104A US 2005225812 A1 US2005225812 A1 US 2005225812A1
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US
United States
Prior art keywords
photodetector array
scanner
carriage
gear
rectangular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/821,821
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English (en)
Inventor
J. Bledsoe
Gregory Carlson
Todd McClelland
Patrick Mckinley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marvell International Technology Ltd
Original Assignee
Agilent Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US10/821,821 priority Critical patent/US20050225812A1/en
Application filed by Agilent Technologies Inc filed Critical Agilent Technologies Inc
Assigned to AGILENT TECHNOLOGIES, INC. reassignment AGILENT TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLEDSOE, J. DAREN, CARLSON, GREGORY F., MCCLELLAND, TODD A., MCKINLEY, PATRICK A.
Priority to DE102005004393.3A priority patent/DE102005004393B4/de
Priority to JP2005108389A priority patent/JP4863188B2/ja
Publication of US20050225812A1 publication Critical patent/US20050225812A1/en
Assigned to AVAGO TECHNOLOGIES GENERAL IP PTE. LTD. reassignment AVAGO TECHNOLOGIES GENERAL IP PTE. LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AGILENT TECHNOLOGIES, INC.
Assigned to AVAGO TECHNOLOGIES IMAGING IP (SINGAPORE) PTE. LTD. (COMPANY REGISTRATION NO. 200512334M) reassignment AVAGO TECHNOLOGIES IMAGING IP (SINGAPORE) PTE. LTD. (COMPANY REGISTRATION NO. 200512334M) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. (COMPANY REGISTRATION NO. 200512430D)
Assigned to MARVELL INTERNATIONAL TECHNOLOGY LTD. reassignment MARVELL INTERNATIONAL TECHNOLOGY LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AVAGO TECHNOLOGIES IMAGING IP (SINGAPORE) PTE. LTD.
Priority to US12/502,053 priority patent/US8542412B2/en
Priority to JP2009192506A priority patent/JP5322297B2/ja
Priority to JP2011088350A priority patent/JP2011176861A/ja
Priority to JP2013251220A priority patent/JP5959014B2/ja
Assigned to AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. reassignment AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE NAME PREVIOUSLY RECORDED AT REEL: 017206 FRAME: 0666. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: AGILENT TECHNOLOGIES, INC.
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
    • H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
    • H04N1/1017—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components the main-scanning components remaining positionally invariant with respect to one another in the sub-scanning direction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
    • H04N2201/0446—Constructional details not otherwise provided for, e.g. mounting of scanning components

Definitions

  • a light source e.g., cold cathode fluorescent lamp, a xenon lamp, or light emitting diodes
  • a scan head e.g., consisting of mirrors, lens, filter, and image sensor array
  • the scan head is attached to a stabilizer bar to ensure that there is no wobble or deviation in the pass (i.e., a single complete scan of the document).
  • a typical charged coupled device (CCD) image sensor has 3 linear CCD sensor arrays. Each linear array has a different color filter (e.g., red, green, and blue) placed directly on top of the CCD sensors.
  • the scanner then combines the data from the linear CCD sensor arrays into a single full-color image.
  • a typical contact image sensor CIS
  • CMOS complementary metal oxide semiconductor
  • Scanners vary in resolution and sharpness. Most flatbed scanners have a true hardware resolution of at least 600 ⁇ 600 dots per inch (dpi).
  • the scanner's dpi is determined by the number of sensors in a single row (x-direction sampling rate) of the sensor array and by the precision of the stepper motor (y-direction sampling rate). For example, if the resolution is 600 ⁇ 600 dpi and the scanner is capable of scanning a letter-sized document, then the CCD image sensor would have three linear arrays each having 5,100 sensors while a CIS would have one linear array of 5,100 sensors.
  • the stepper motor in this example is able to move in increments equal to 1/600ths of an inch.
  • a scanner in one embodiment, includes a housing, a transparent platen atop the housing for receiving an object to be scanned, and a carriage operable to travel along a horizontal direction and a vertical direction.
  • the carriage includes a light source for illuminating the object and a rectangular photodetector array for simultaneously detecting light intensity of multiple scan lines.
  • FIG. 1 illustrates a top view of a flatbed scanner in one embodiment of the invention.
  • FIGS. 2 and 3 illustrate cross-sectional side views of the flatbed scanner of FIG. 1 in one embodiment of the invention.
  • FIGS. 4 and 5 illustrate movement of a rectangular photodetector array in embodiments of the invention.
  • FIG. 6 illustrates a cross-sectional side view of a sheet feeder scanner in one embodiment of the invention.
  • FIG. 7 illustrates a cross-sectional side view of a flatbed scanner in one embodiment of the invention.
  • FIG. 1 illustrates a flatbed scanner 10 in one embodiment of the invention.
  • Scanner 10 includes a housing 12 , a cover 14 hingedly attached to housing 12 , a transparent (e.g., glass) platen 16 atop housing 12 , and a carriage 18 within housing 12 .
  • Carriage 18 travels within housing 12 on a vertical gear channel 20 and a horizontal gear channel 22 .
  • Carriage 18 includes a rectangular photodetector array 24 and an illumination ring 26 .
  • photodetector array 24 has multiple (e.g., more than three) rows of complementary metal oxide semiconductor (CMOS) sensors.
  • CMOS complementary metal oxide semiconductor
  • photodetector array 24 consists of a variety of red, blue, and green photodiodes and the actual color at the site of each photodiode is interpolated from the colors of the neighboring photodiodes.
  • photodetector array 24 may have a resolution of 352 ⁇ 288 pixels.
  • photodetector array 24 may have 1.3 megapixel of resolution to enable the entire page to be scanned more quickly.
  • illumination ring 26 are light emitting diodes (LEDs) formed around photodetector array 24 on the same die.
  • FIG. 2 illustrates a cross-section view of carriage 18 along line A ( FIG. 1 ) in one embodiment of the invention.
  • Photodetector array 24 and illumination ring 26 are mounted on a plate 32 .
  • Mounting plate 32 includes a horizontal guide 34 .
  • a motor 36 and associated gear system 38 are mounted to plate 32 .
  • a horizontal carriage bar 40 defines a horizontal guide channel 42 that receives guide 34 .
  • Horizontal carriage bar 40 further defines gear channel 22 that receives a gear from gear system 38 .
  • Gear channel 22 includes teeth that engage gear system 38 .
  • motor 36 drives gear system 38 to move carriage 18 horizontally across the object to be scanned.
  • a flex cable 50 ( FIG. 3 ) moves the image data from photodetector array 24 to horizontal carriage bar 40 .
  • FIG. 3 illustrates a cross-section view of carriage 18 along line B ( FIG. 1 ) in one embodiment of the invention.
  • Horizontal carriage bar 40 includes vertical guides 44 A and 44 B.
  • a motor 46 and associated gear system 48 are mounted to horizontal carriage bar 40 .
  • Housing 12 defines vertical guide channels 52 A and 52 B that receive corresponding guides 44 A and 44 B.
  • Housing 12 further defines gear channel 20 that receives a gear from gear system 48 .
  • Gear channel 48 includes teeth that engage gear system 48 .
  • motor 46 drives gear system 48 to move carriage 18 vertically down the object to be scanned.
  • a flex cable 52 moves the image data from horizontal carriage bar 40 to the scanner base for the data to be processed by the scanner electronics.
  • FIG. 4 illustrates that, instead of slowly moving scan line by scan line as in conventional flatbed scanners, carriage 18 moves horizontally or vertically in large increments (e.g., exemplified by a movement 62 of sensor 64 ) equal to or greater than the corresponding width and height of photodetector array 24 in one embodiment of the invention. This allows for a faster scanning process.
  • software is used to interpolate pixel colors and to stitch together the scanned portions into a single color image of the object. Software can also be used to correct any non-uniform lighting.
  • FIG. 5 illustrates that the resolution can be increased by micro-stepping rectangular photodetector array 24 both horizontally and vertically in small increments (e.g., exemplified by a movement 66 of sensor 64 ) in one embodiment of the invention.
  • the horizontal increment is less than the horizontal spacing between adjacent sensors while the vertical increment is less than the vertical spacing between adjacent sensors.
  • photodetector array 24 produces 300 ⁇ 300 dpi
  • the resolution can be doubled to 600 ⁇ 600 dpi by (1) capturing an image of the object, (2) moving photodetector array 24 by half (1 ⁇ 2) a dpi in the horizontal and the vertical directions, and (3) capturing another image of the object.
  • Software is then used to combine the two images to form a 600 ⁇ 600 dpi image of the object.
  • carriage 18 can move horizontally or vertically in a large increment to scan the next area on the object, followed by another micro-step.
  • FIG. 6 illustrates a side cross-sectional view of a sheet feeder scanner 100 in one embodiment of the invention.
  • Scanner 100 includes a housing 102 , a sheet feeder 104 , feed rollers 106 , and a carriage 108 within housing 102 .
  • Sheet feeder 104 grabs a single sheet 110 of document from a stack 112 and moves it vertically to feed rollers 106 .
  • Feed rollers 106 move sheet 110 past carriage 108 .
  • Carriage 108 includes rectangular photodetector array 24 and illumination ring 26 . To scan sheet 110 , carriage 108 travels horizontally within housing 102 on horizontal gear channel 22 and horizontal guide channel 42 .
  • Carriage 108 is similar to carriage 18 but without the vertical travel components because feed rollers 106 function to move the paper vertically past carriage 108 . Instead of moving the paper slowly scan line by scan line as in conventional sheet feeder scanners, feed rollers 106 vertically move single sheet 110 in large increments equal to or greater than the height of photodetector array 24 . Again, this allows for a faster scanning process because portions of the documents are simultaneously captured as multiple scan lines by rectangular photodetector array 24 .
  • FIG. 7 illustrates a side cross-sectional view of a flatbed scanner 200 in one embodiment of the invention.
  • Scanner 200 includes a housing 212 , a glass platen 216 atop housing 212 , a stationary rectangular photodetector array 218 with optics 220 , and light sources 222 .
  • the object to be scanned (e.g., object 224 ) is placed on glass platen 16 .
  • Light sources 222 then illuminates the entire object by directing light onto object 224 or bouncing light off the sidewalls of housing 212 and then onto object 224 .
  • Light is reflected from object 224 and directed by optics 220 onto rectangular photodetector array 218 .
  • Photodetector array 218 converts the light intensity of the scanned object into electrical signals. Instead of moving a carriage as in conventional scanners, photodetector array 218 remains stationary and scans the entire object at once. Again, this allows for a faster scanning process because multiple scan lines are captured simultaneously by photodetector array 218 .
  • Software can be used to interpolate pixel colors and to correct any non-uniform lighting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Image Input (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
US10/821,821 2004-04-08 2004-04-08 Two-dimensional CMOS sensor array to image documents and other flat objects Abandoned US20050225812A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US10/821,821 US20050225812A1 (en) 2004-04-08 2004-04-08 Two-dimensional CMOS sensor array to image documents and other flat objects
DE102005004393.3A DE102005004393B4 (de) 2004-04-08 2005-01-31 Zweidimensionales CMOS-Sensorarray zur Abbildung von Dokumenten und anderen flachen Objekten
JP2005108389A JP4863188B2 (ja) 2004-04-08 2005-04-05 文書および他の平坦な被写体を撮像するためのフラットベッド・スキャナ
US12/502,053 US8542412B2 (en) 2004-04-08 2009-07-13 Two-dimensional CMOS sensor array to image documents and other flat objects
JP2009192506A JP5322297B2 (ja) 2004-04-08 2009-08-21 文書および他の平坦な被写体を撮像するためのフラットベッド・スキャナ
JP2011088350A JP2011176861A (ja) 2004-04-08 2011-04-12 文書および他の平坦な被写体を撮像するためのフラットベッド・スキャナ
JP2013251220A JP5959014B2 (ja) 2004-04-08 2013-12-04 文書及び他の平坦な被写体を撮像するための２次元ｃｍｏｓセンサアレイ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/821,821 US20050225812A1 (en) 2004-04-08 2004-04-08 Two-dimensional CMOS sensor array to image documents and other flat objects

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/502,053 Division US8542412B2 (en) 2004-04-08 2009-07-13 Two-dimensional CMOS sensor array to image documents and other flat objects

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US20050225812A1 true US20050225812A1 (en) 2005-10-13

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US10/821,821 Abandoned US20050225812A1 (en) 2004-04-08 2004-04-08 Two-dimensional CMOS sensor array to image documents and other flat objects
US12/502,053 Expired - Fee Related US8542412B2 (en) 2004-04-08 2009-07-13 Two-dimensional CMOS sensor array to image documents and other flat objects

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US (2) US20050225812A1 (enrdf_load_stackoverflow)
JP (4) JP4863188B2 (enrdf_load_stackoverflow)
DE (1) DE102005004393B4 (enrdf_load_stackoverflow)

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US20060203300A1 (en) * 2005-03-09 2006-09-14 Samsung Electronics Co., Ltd. Image scanning unit and image forming apparatus having the same
US20080007804A1 (en) * 2006-07-06 2008-01-10 Samsung Electronics Co., Ltd. Image sensor having improved resolution and image sensing method using the same
WO2012039594A1 (en) * 2010-09-24 2012-03-29 Pradotec Corporation Sdn. Bhd. Imaging device and imaging device attachment

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US20050225812A1 (en) * 2004-04-08 2005-10-13 Bledsoe J D Two-dimensional CMOS sensor array to image documents and other flat objects
DE102010008794A1 (de) * 2010-02-22 2011-08-25 Burgmer, Heinrich, 51789 Hochauflösende Bilderstellung, -verarbeitung mittels "Pixelinterner-Raster-Analyse" und extern erzeugter hochauflösender Rasterschrittweite
US10543371B2 (en) 2015-06-30 2020-01-28 Cochlear Limited Systems and methods for alerting auditory prosthesis recipient
US20170126921A1 (en) * 2015-10-30 2017-05-04 Gheorghe Olaru Document Scanner-Copier with a Stationary Imaging and Illumination Engine

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US20060203300A1 (en) * 2005-03-09 2006-09-14 Samsung Electronics Co., Ltd. Image scanning unit and image forming apparatus having the same
US8743428B2 (en) * 2005-03-09 2014-06-03 Samsung Electronics Co., Ltd. Image scanning unit and image forming apparatus having the same
USRE48261E1 (en) * 2005-03-09 2020-10-13 Hewlett-Packard Development Company, L.P. Image scanning unit and image forming apparatus having the same
US20080007804A1 (en) * 2006-07-06 2008-01-10 Samsung Electronics Co., Ltd. Image sensor having improved resolution and image sensing method using the same
US7821680B2 (en) * 2006-07-06 2010-10-26 Samsung Electronics Co., Ltd. Image sensor having improved resolution and image sensing method using the same
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Also Published As

Publication number Publication date
JP2011176861A (ja) 2011-09-08
JP2010022012A (ja) 2010-01-28
JP5322297B2 (ja) 2013-10-23
DE102005004393B4 (de) 2015-09-10
JP5959014B2 (ja) 2016-08-02
JP2014045521A (ja) 2014-03-13
DE102005004393A1 (de) 2005-11-17
JP4863188B2 (ja) 2012-01-25
JP2005304024A (ja) 2005-10-27
US20090273817A1 (en) 2009-11-05
US8542412B2 (en) 2013-09-24

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