EP2036325A1 - Procede et dispositif de numerisation d'un document - Google Patents
Procede et dispositif de numerisation d'un documentInfo
- Publication number
- EP2036325A1 EP2036325A1 EP07729064A EP07729064A EP2036325A1 EP 2036325 A1 EP2036325 A1 EP 2036325A1 EP 07729064 A EP07729064 A EP 07729064A EP 07729064 A EP07729064 A EP 07729064A EP 2036325 A1 EP2036325 A1 EP 2036325A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- document
- sensor
- digital data
- scrolling
- image
- 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.)
- Withdrawn
Links
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
- H04N1/047—Detection, control or error compensation of scanning velocity or position
- H04N1/0473—Detection, control or error compensation of scanning velocity or position in subscanning direction, e.g. picture start or line-to-line synchronisation
-
- 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
- H04N1/12—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 the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
-
- 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
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04703—Detection of scanning velocity or position using the scanning elements as detectors, e.g. by performing a prescan
-
- 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
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/0471—Detection of scanning velocity or position using dedicated detectors
-
- 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
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04715—Detection of scanning velocity or position by detecting marks or the like, e.g. slits
- H04N2201/04717—Detection of scanning velocity or position by detecting marks or the like, e.g. slits on the scanned sheet, e.g. a reference sheet
-
- 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
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04715—Detection of scanning velocity or position by detecting marks or the like, e.g. slits
- H04N2201/04724—Detection of scanning velocity or position by detecting marks or the like, e.g. slits on a separate encoder wheel
- H04N2201/04725—Detection of scanning velocity or position by detecting marks or the like, e.g. slits on a separate encoder wheel connected to the sub-scanning drive means
-
- 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
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04732—Detecting at infrequent intervals, e.g. once or twice per line for main-scan control
-
- 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
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04753—Control or error compensation of scanning position or velocity
- H04N2201/04758—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area
- H04N2201/04787—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area by changing or controlling the addresses or values of pixels, e.g. in an array, in a memory, by interpolation
Definitions
- the invention relates to a method of digitizing documents.
- quality standards define geometric accuracy criteria for digitization.
- IAFIS Image Quality Specification (defined in document IAFIS-DOC-0178-7.1, May 2, 2005, Appendix F, Federal Bureau of Investigation, CJIS Division) for example requires a scanning resolution of 500 dpi ( dots per inch) ⁇ 1% and distortion equal to ⁇ 0.0007 inches (or 0.01778 mm) for a distance of 0 to 0.07 inches (0 to 1.78 mm) and equal to ⁇ 1% for a distance of between 0.07 inches and 1.5 inches (between 1.78 and 38.1 mm).
- scrolling scanners in which a document is scrolled in front of a fixed sensor by a drive mechanism, generally does not allow to meet such criteria of geometric accuracy.
- An object of the invention is to improve the resolution of digital data obtained from a scroll scanner.
- the invention proposes a method of digitizing a document according to which the document is driven in scrolling past a sensor by a drive mechanism comprising a plurality of members coming into contact with the document during scrolling, the sensor being adapted to generate digital data from an image on the document, the method comprising the steps of:
- the detection step makes it possible to calibrate the distortion correction function by taking into account the variations in the speed of scrolling of the document due to the contacting or the breaking of contact between the document and the organs of the mechanism. drive.
- This method thus makes it possible to obtain a correction of the defects of regularity of the resolution in the running direction of the document.
- the members comprise rollers between which the document is driven in scrolling
- the detection of the contacting or the breaking of contact is carried out by means of a sensor able to measure a rotation of a roller,
- the method comprises a step of inserting in the digital data, registration data defining the position of the sensor with respect to the image at the time of detection,
- the insertion step is performed by means of a light source arranged facing the sensor, the step of inserting the registration data comprises the step of controlling the activation or the deactivation of the light source at the time of the detection of the contacting or the breaking of contact,
- the method comprises a preliminary calibration operation comprising steps of scrolling in front of the sensor a document on which a reference image appears, and from the digital data obtained, defining a distortion correction function,
- the reference image represents a pattern formed by a pattern having known geometric characteristics.
- the invention also relates to a device for scanning a document, of the type comprising a sensor capable of generating digital data from an image on the document, and a drive mechanism for driving the document in scrolling mode.
- the drive mechanism comprising a plurality of members coming into contact with the document during scrolling, characterized in that the device further comprises means for detecting contacting or breaking contact between the document and one of the organs, and means for correcting the digital data by applying to the data a distortion correction function which takes into account a position of the sensor with respect to the image at the time of detection.
- the members comprise rollers between which the document is driven in scrolling
- the means for detecting contacting or breaking contact comprise a sensor capable of measuring a rotation of a roller
- the device comprises means for inserting in the digital data marking data defining the position of the sensor with respect to the image at the moment of detection,
- the means for inserting marking data comprise a light source arranged facing the sensor, the means for inserting marking data comprise means for controlling the activation or the deactivation of the light source at the time of the detection of the contacting or the breaking of contact,
- the distortion function is defined from digital data obtained from a document on which a reference image appears.
- FIG. 1 schematically represents a drive mechanism of a scrolling scanner
- FIG. 2 schematically represents a curve of the distortion measured as a function of the position of the document during its scrolling
- FIG. 3 schematically represents a digitizing device, according to one embodiment of the invention
- FIG. 4 schematically represents steps of a digitization method according to an embodiment of the invention.
- the scroll scanner 1 comprises a fixed sensor 2 and a drive mechanism 3 able to drive a document 4 in the form of a sheet in front of the sensor 2.
- the sensor 2 is able, during scrolling of the document 4, to generate digital data from an image on the document
- the drive mechanism 3 comprises an introducer roller 31 and a brake roller 32 disposed facing the introducing roll 31.
- the introducing roll 31, when rotated, is able to take the sheet 4 and insert the sheet 4 into the drive mechanism 3 to initiate the scrolling of the sheet.
- the sheet 4 is introduced between the introducer roller 31 and the brake roller 32.
- the brake roller 32 is rotatably mounted and is coupled to a braking device (not shown) which opposes the rotation of the brake roller.
- the brake roller 32 serves firstly to press the sheet 4 against the introducer roll 31 and secondly to hold a subsequent sheet 5 to avoid picking several sheets at a time.
- the driving device 3 further comprises driving rollers 33, 34, 35, 36 arranged along the document's running path.
- the sheet 4 is driven in scrolling between the drive rollers 33, 34, 35, 36 by contacting the rollers with the faces of the sheet 4.
- the drive rollers 33, 34, 35, 36 are arranged in pairs.
- the rollers 33, 34 and 35, 36 of the same pair extend on either side of the travel path of the sheet 4.
- the pairs of rollers 33, 34 and 35, 36 are arranged respectively upstream and downstream of the sensor 2 with respect to the direction of travel of the sheet 4 so as to keep a zone of the sheet 4 facing the sensor 2 taut.
- FIG. 2 is a diagram showing a curve of the measured distortion (in inches) of the digital data generated by the sensor 2 as a function of the position of a sheet (in pixels) with respect to the sensor 2 during scrolling of the leaf.
- the curve of FIG. 2 has been obtained by scrolling in front of the sensor 2 a document on which there is a reference image, that is to say an image comprising a pattern whose geometric parameters are known precisely.
- the reference image represents a pattern typically formed by a repetition of a pattern comprising an alternation of bands or lines, arranged at a predetermined interval, the bands or lines extending substantially perpendicular to the direction of travel of the document. reference.
- the test pattern is, for example, a periodic Ronchi pattern with a spatial frequency of 1 cycle per millimeter.
- the maximum error generated in the digital data occurs during the transition (B) between the second phase (during which the sheet is in contact with the brake roller) and the third phase (during which the sheet n ' is more in contact with the brake roller).
- the maximum distortion occurs at the time of the breakage of contact between the document and the brake roller, because the brake roller abruptly stops exerting a braking action on the document.
- Figure 3 schematically shows a digitizing device according to an embodiment of the invention.
- the device 1 comprises a fixed sensor 2 and a drive mechanism 3 according to the device of FIG.
- the device 1 of FIG. 3 further comprises a rotation sensor 6, such as an optical encoder or a Hall effect sensor, coupled to the introducer roll 31.
- the rotation sensor 6 is able to generate a electrical signal representative of the position or speed of rotation of the introducer roll 31.
- the device 1 also comprises a light source 7, in the form of a light-emitting diode, and a control circuit 8 of the source.
- the source 7 is arranged opposite the fixed sensor 2, on one side of the document movement path 4.
- the control circuit 8 receives as input the signal generated by the rotation sensor 6 and outputs a current of supply of the light source 7. More precisely, the control circuit 8 is able to control the source 7 to selectively switch the source on or off.
- the device 1 comprises processing means 9, in the form of a computer 9.
- the processing means 9 receive the digital data coming from the fixed sensor 2 and are programmed to apply a processing to the digital data, the processing including a correction of the digital data by applying a distortion correction function.
- Figure 4 schematically shows steps of a digitization method according to an embodiment of the invention.
- the method comprises a prior calibration operation of the digitizing device.
- the calibration operation comprises the following steps.
- a document on which a reference image is displayed is scrolled in front of the sensor 2.
- a second step 12 from the digital data generated by the sensor 2, data distortions are measured during scrolling of the document.
- a distortion correction function is deduced therefrom.
- the distortion correction function is defined as an inverse transformation of the distortions measured in the second step 12.
- the calculation of the distortion function consists of a resampling of the rows of pixels in the obtained digital data.
- the distortion correction function is associated with the drive mechanism of the digitizing device. The calibration operation is thus performed only once for a given scanning device 1. Then, this same correction function is used during each operation of scanning a document.
- the method then comprises a document scanning operation 20.
- the scanning operation comprises the following steps.
- a document 4 to be scanned is scanned in front of the sensor 2.
- Document 4 is for example a document containing security information, such as an image of a fingerprint.
- the rotation sensor 6 detects the rotation of the introducer roll 31 and generates an output signal representative of the speed of rotation of the introducer roll 31.
- control circuit 8 transmits to the light source 7 a supply current to keep the source 7 on.
- the scanning sensor 2 Because the source 7 is disposed opposite the scanning sensor 2, the scanning sensor 2 generates digital data which includes not only the image on the document, but also a white line that extends along the length of the document. an edge of the image, the white line being generated by the light source 7 on.
- a second step 22 during scrolling of the document 4, it detects a contact break between the document 4 and the brake roller 32.
- the speed of the introducer roll 31 decreases abruptly and vanishes.
- the rotation sensor 31 then generates an output signal which decreases and vanishes, indicating that the introducer roll 31 has come to a standstill.
- the control circuit 8 detects the cancellation of the output signal of the motion sensor. For this purpose, the control circuit 8 compares the output signal of the rotation sensor 6 with a predefined threshold value. According to a third step 23, the extinction of the light source 7 is controlled.
- the control circuit 8 stops supplying the light source 7, so that the light source 7 goes off.
- the white line generated by the source 7 in the digital data is interrupted and is prolonged by a black line.
- the transition between the white line and the black line constitutes a registration mark inserted into the digital data, the registration mark defining the position of the sensor 2 with respect to the image at the time of detection of the contact break between the document. 4 and the brake roller 32.
- the digital data obtained is applied to a distortion correction function which takes into account the position of the sensor 2 with respect to the image at the moment of detection.
- the registration mark in the digital data makes it possible to calibrate the distortion correction function and thus obtain corrected numerical data having a reduced distortion rate.
- An advantage of the device shown in FIG. 3 and the method shown in FIG. 4 is that the detection of the variations of the scrolling speed is carried out directly on the drive mechanism, by measuring a parameter of movement of an organ of this mechanism. . Therefore, the proposed device and method allow correction of the digital data particularly suited to a given drive mechanism.
- the device and the proposed method can be made from simple equipment.
- the resolution of the digitization is regulated by the speed of scrolling of the document.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
- Image Input (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0604665A FR2901652B1 (fr) | 2006-05-24 | 2006-05-24 | Procede et dispositif de numerisation d'un document |
PCT/EP2007/054612 WO2007134996A1 (fr) | 2006-05-24 | 2007-05-14 | Procede et dispositif de numerisation d'un document |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2036325A1 true EP2036325A1 (fr) | 2009-03-18 |
Family
ID=37526995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07729064A Withdrawn EP2036325A1 (fr) | 2006-05-24 | 2007-05-14 | Procede et dispositif de numerisation d'un document |
Country Status (5)
Country | Link |
---|---|
US (1) | US8164797B2 (fr) |
EP (1) | EP2036325A1 (fr) |
CA (1) | CA2653053A1 (fr) |
FR (1) | FR2901652B1 (fr) |
WO (1) | WO2007134996A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018523335A (ja) * | 2015-05-22 | 2018-08-16 | ヒューレット−パッカード デベロップメント カンパニー エル.ピー.Hewlett‐Packard Development Company, L.P. | 媒体走査動作制御 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4511242A (en) * | 1982-12-22 | 1985-04-16 | International Business Machines Corporation | Electronic alignment for a paper processing machine |
JPS6370658A (ja) * | 1986-09-12 | 1988-03-30 | Canon Inc | 画像読取装置 |
US6912325B2 (en) * | 2000-05-17 | 2005-06-28 | Eastman Kodak Company | Real time electronic registration of scanned documents |
US20030038993A1 (en) * | 2001-08-24 | 2003-02-27 | Jen-Shou Tseng | Automatic document-scanning method for scanner |
KR100514747B1 (ko) * | 2003-05-07 | 2005-09-14 | 삼성전자주식회사 | 잉크젯 프린터의 바닥용지 피딩량 보정방법 |
JP2004336393A (ja) * | 2003-05-07 | 2004-11-25 | Seiko Epson Corp | 画像処理装置 |
-
2006
- 2006-05-24 FR FR0604665A patent/FR2901652B1/fr not_active Expired - Fee Related
-
2007
- 2007-05-14 US US12/227,199 patent/US8164797B2/en not_active Expired - Fee Related
- 2007-05-14 CA CA002653053A patent/CA2653053A1/fr not_active Abandoned
- 2007-05-14 WO PCT/EP2007/054612 patent/WO2007134996A1/fr active Application Filing
- 2007-05-14 EP EP07729064A patent/EP2036325A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2007134996A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20090190188A1 (en) | 2009-07-30 |
WO2007134996A1 (fr) | 2007-11-29 |
CA2653053A1 (fr) | 2007-11-29 |
FR2901652B1 (fr) | 2008-07-25 |
FR2901652A1 (fr) | 2007-11-30 |
US8164797B2 (en) | 2012-04-24 |
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