CN104660855A - Correction device and correction method for scanning images - Google Patents
Correction device and correction method for scanning images Download PDFInfo
- Publication number
- CN104660855A CN104660855A CN201310589694.2A CN201310589694A CN104660855A CN 104660855 A CN104660855 A CN 104660855A CN 201310589694 A CN201310589694 A CN 201310589694A CN 104660855 A CN104660855 A CN 104660855A
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- Prior art keywords
- paper
- paper feed
- scan
- sensing unit
- scanning
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- 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
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- 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
- H04N1/121—Feeding arrangements
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
The invention provides a correction device and a correction method for scanning images. The correction device comprises a scanning unit arranged on a paper feeding path and used for scanning passing paper, a first paper feeding wheel arranged at the upstream of the scanning unit, a second paper feeding wheel arranged at the downstream of the scanning unit, a sensing unit arranged on the paper feeding path to detect the position of the paper and the distance between front paper and rear paper, and a control unit electrically connected to the sensing unit and used for controlling the rotation speeds of the first paper feeding wheel and the second paper feeding wheel according to signals sent by the sensing unit, wherein no other paper feeding wheels are arranged between the first paper feeding wheel and the second paper feeding wheel; the distance between the first paper feeding wheel and the second paper feeding wheel is smaller than the length of the paper. By virtue of the correction device and the correction method for scanning images, the position of the paper is detected for adjusting the rotation speeds of the paper feeding wheels in real time so as to avoid the change of the paper conveying speed.
Description
Technical field
The present invention relates to a kind of means for correcting and bearing calibration of scan-image, be specifically related to the numerically controlled scan-image means for correcting of a kind of employing and bearing calibration.
Background technology
Refer to Fig. 1, be adopt multiple roller 22 ', 23 ' continuous print to be conducted through scanning means by feeding box in the automatic scanner of general paper feed type, and utilize the word above scanning means 30 ' reading paper or image.Can keeping smooth in order to ensure paper in course of conveying, the downstream roller 23 ' velocity of rotation being positioned at transport path downstream can be made when designing paper advance mechanism slightly faster than the upstream paper-feeding roller 22 ' being positioned at upstream.Utilize the speed difference of upstream and downstream two rollers 22 ', 23 ' to be stretched by paper to shakeout.
Refer to Fig. 2 again, and when paper 10 is by scanning means, scanning means will from paper 10 surface acquisition one strip, and orthogonal with sheet transport direction image, for convenience of following explanation, in follow-up specification by the image of this strip referred to as scan line 60.Because scanning means 30 ' carries out photography sampling with the fixing figure of frequency to paper 10 surface, the distance therefore between each scan line 60 is equal.After the surface of full size 10 is all intercepted, just by process, all scan lines 60 can be spliced to form complete picture again.
Now refer to Fig. 3, as shown in the figure, combined by each scan line 60 owing to intactly scanning picture, therefore when the transporting velocity of paper 10 is accelerated suddenly or slows down time, distance between scan line 60 and scan line 60 will reduce thereupon or lengthens, and causes the aspect ratio be finally spliced to form abnormal.And one of reason wherein the most easily causing paper sheet delivery speed to change departs from upstream roller 22 ' in a flash when paper 10 tail end, the rolling speed because of downstream roller 23 ' is very fast and make paper produce the acceleration of moment.
The aspect ratio obtained in order to avoid scanning produces mistake, and existing automatic scanner takes various different means and produces velocity variations to avoid paper tail end when departing from roller.Such as United States Patent (USP) the 3rd, the feature shown in 988, No. 817 adopts different materials to make paper-feeding roller, makes process during paper tail end disengaging paper-feeding roller comparatively gentle, and then avoid paper to accelerate suddenly; And at United States Patent (USP) the 6th, be then in paper-feeding roller, install an actuating device in 530, No. 569, when the tail end of paper prepares just to discharge paper-feeding roller when will depart from paper-feeding roller, avoid paper to accelerate suddenly.
But roller can cause degraded performance under the wearing and tearing of Long-Time Service, and the method installing actuating device will improve cost of manufacture.Because above shortcoming, be necessary to be improved existing automatic scanner in fact, produce and the scan-image means for correcting safeguarded and bearing calibration to provide a kind of being easy to.
Summary of the invention
Main purpose of the present invention is to provide a kind of being easy to produce and the scan-image means for correcting safeguarded and bearing calibration.
For reaching above-mentioned purpose, the present invention comprises one scan unit, to be installed on paper feed path and the paper scanned through; One first paper feed wheel, is arranged at the upstream of scanning element; One second paper feed wheel, is arranged at the downstream of scanning element, and wherein the first paper feed wheel and the second paper feed do not arrange other paper feeds and take turns between take turns, and the first paper feed is taken turns and the second paper feed take turns between distance be less than yardage; One sensing unit, is arranged on paper feed path to detect the distance between the position of paper and front and back paper; And a control unit, be electrically connected with sensing unit and the velocity of rotation of taking turns to control first and second paper feed according to the signal that sensing unit sends.
As further improvement, above-mentioned sensing unit comprises one from paper sensor and one scan transducer, be arranged at whether the first paper feed wheel is other is taken turns by the first paper feed with the tail end detecting spacing between paper and paper and paper from paper sensor, and scanning sensor is arranged at by scanning element whether pass through scanning element to detect paper.
As further improvement, first paper feed wheel is taken turns with the second paper feed and is driven by stepper motor, utilize stepper motor to change the characteristic of rotation direction and speed along with the signal of telecommunication difference accepted, enable control unit control rotation direction and the speed of first and second paper feed wheel.
In the present invention, the step of correct scan image is as follows:
Paper is passed through in paper feed path by first, second paper feed wheel one by one, and the sensing unit be simultaneously arranged on paper feed path starts to monitor the position of paper and the spacing between paper and paper; When namely paper will pass through scanning element, sensing unit sends a signal to control unit to start to scan paper with gated sweep unit; When sensing unit detects that the feed status of paper changes, then send a signal to control unit, adjust the velocity of rotation of first and second paper feed wheel and then avoid the transporting velocity of paper to change.
As further improvement, when this sensing unit detects that the feed status of paper changes, then send a signal to this control unit, the velocity of rotation controlling this first paper feed wheel and this second paper feed wheel and then the step avoiding the transporting velocity of paper to change comprise further:
Utilize the scanning sensor being arranged on the other sensing unit of scanning element the leading edge of paper to be detected, and send a signal to control unit when scanning sensor is triggered; After control unit receives the signal of scanning sensor, by control unit gated sweep unit, scan paper; And still can sense paper when scanning sensor, but be arranged on the other sensing unit of the first paper feed wheel detect that paper leaves from paper sensor time, by sending a signal to control unit from paper sensor; After the signal that control unit receives from paper sensor, just control the second paper feed wheel reduce velocity of rotation, make to avoid paper excessive velocities scan-image produce abnormal.
In the present invention, by test paper tension position, the velocity of rotation of adjustment paper feed wheel changes to avoid the transporting velocity of paper in real time.Compared with prior art, the present invention does not need to install extra means, and the error produced after mechanical component use abrasion can be avoided.Thus a kind of being easy to can be provided to produce and the scan-image means for correcting safeguarded and bearing calibration.
Accompanying drawing explanation
Fig. 1 is the generalized section of existing autoamtic paper feeding formula scanner;
Fig. 2 and Fig. 3 is that paper sheet delivery speed changes the schematic diagram causing scan-image exception;
Fig. 4 is the generalized section of scan-image means for correcting of the present invention;
Fig. 5 is adjustment of image step of the present invention;
Fig. 6 is the generalized section that the present invention starts when scanning; And
Generalized section when Fig. 7 is switched scan pattern of the present invention.
Wherein, description of reference numerals is as follows:
Embodiment
For describing technology contents of the present invention, structural feature, the object reached and effect in detail, hereby illustrating below and coordinating accompanying drawing to be explained in detail.
Now refer to Fig. 4, scan-image means for correcting of the present invention comprises one scan unit 30, is installed on paper feed path 21 with the paper scanned through; One first paper feed wheel 22, is arranged at the upstream of scanning element 30; One second paper feed wheel 23, is arranged at the downstream of scanning element 30, and wherein the first paper feed wheel 22 and the second paper feed do not arrange other paper feeds and take turns between take turns 23, and the first paper feed take turns 22 and second the paper feed distance of taking turns between 23 be less than the length of paper.One sensing unit 40, is arranged on paper feed path 21 to detect the distance between the position of paper and front and back paper; And a control unit 50, be electrically connected with sensing unit 40 and the signal sent according to sensing unit 40 to control the velocity of rotation that first and second paper feed takes turns 22,23.
In this embodiment, above-mentioned sensing unit 40 comprises one from paper sensor 41 and one scan transducer 42, is arranged at the first paper feed wheel 22 other from paper sensor 41, in order to whether to detect spacing between paper and paper and paper by the first paper feed wheel 22; It is other that scanning sensor 42 is arranged at scanning element 30, in order to whether to detect paper by scanning element 30.It is driven by stepper motor (not shown) by interlinked mechanism (not shown) that first paper feed wheel 22 and the second paper feed take turns 23.Utilize stepper motor along with the signal of telecommunication accepted different and change the characteristic of rotation direction and speed, make control unit 50 can control the first paper feed take turns 22 and second paper feed take turns 23 rotation direction and speed.
Now refer to Fig. 4 and Fig. 5, the step of scan-image bearing calibration is in the present invention as follows.
When autoamtic paper feeding formula scanner starts to scan, paper is passed through in paper feed path 21 by first, second paper feed wheel 23 one by one, and the sensing unit 40 be simultaneously arranged on paper feed path 21 starts to monitor position and the transporting velocity of paper.When namely paper will pass through scanning element 30, sensing unit 40 sends a signal to control unit 50 to start to scan paper with gated sweep unit 30; And when sensing unit 40 detects that the feed status of paper or transporting velocity change, then send a signal to control unit 50, to adjust first and second paper feed wheel velocity of rotation of 22,23 and the transporting velocity of paper; Until scanned and paper leaves scanning element 30, then the image data of scanning gained is sequentially spliced into complete image.
And in this embodiment, in order to avoid paper causes the ratio of scan-image to change because of acceleration after disengaging first paper feed wheel 22, therefore need to distinguish paper accelerates through scanning element 30 by scanning element 30 and paper time point with normal speed.
Now refer to Fig. 5 to Fig. 7, the step that the present invention carries out scan-image bearing calibration is as follows:
First paper 10 moves in paper feed path 21, the position of scanning element 30 is sent to through first and second paper feed wheel 22,23, because the speed of the second paper feed wheel 23 is slightly faster than the first paper feed wheel 22, and the distance between first, second paper feed wheel 22,23 is less than the length of paper 10, therefore keeping the smooth of paper 10 surface by being subject to tension force when paper 10 is subject to 22,23 clamping of first, second paper feed wheel at the same time, scanning in order to scanning element 30.
When namely paper 10 by touching the scanning sensor 42 of position on scanning element 30 side during scanning element 30, and will send a signal to control unit 50 by scanning sensor 42.Startup scanning element 30 starts to scan paper 10 by control unit 50 after receiving signal.Along with paper 10 moves, the image capture on paper 10 surface is scan line 60 one by one with fixed frequency by scanning element 30.Because now paper 10 moves with uniform velocity, the distance therefore between each bar scan line 60 keeps equal.
And after the tail end of paper 10 departs from the first paper feed wheel 22, therefore paper 10 only will accelerate through scanning element 30 by velocity of rotation the second paper feed wheel 23 drive faster, and make the lengthening distance between scan line 60 and scan line 60, keep equal to allow the distance between scan line 60, just control unit 50 is sent a signal to when detecting that from paper sensor 41 tail end of paper 10 departs from when the first paper feed takes turns 22, control unit 50 just lowers the velocity of rotation of stepper motor upon receipt of the signals, and then make the velocity of rotation of the second paper feed wheel 23 reduce constant with the translational speed maintaining paper 10.
From describing above, the present invention is by test paper tension position, and the velocity of rotation of adjustment paper feed wheel changes to avoid the transporting velocity of paper in real time.Compared with prior art, the present invention does not need to install extra means, and the error produced after mechanical component use abrasion can be avoided.Thus a kind of being easy to can be provided to produce and the scan-image means for correcting safeguarded and bearing calibration.
Claims (5)
1. a means for correcting for scan-image, is characterized in that, comprises:
One scan unit, to be installed on paper feed path and the paper scanned through;
One first paper feed wheel, is arranged at the upstream of this scanning element;
One second paper feed wheel, is arranged at the downstream of this scanning element, and wherein this first paper feed wheel and this second paper feed do not arrange other paper feeds and take turns between take turns, and this first paper feed is taken turns and this second paper feed take turns between distance be less than the length of this paper;
One sensing unit, is arranged on this paper feed path to detect the position of paper and the distance between paper and paper; And
One control unit, be electrically connected with this sensing unit and the signal sent according to this sensing unit to control the velocity of rotation that this first paper feed is taken turns and this second paper feed is taken turns.
2. the means for correcting of scan-image as claimed in claim 1, it is characterized in that: described sensing unit comprises one from paper sensor and one scan transducer, should be arranged at whether this first paper feed wheel is other is taken turns by this first paper feed with the tail end detecting spacing between paper and paper and paper from paper sensor, and this scanning sensor to be arranged at this scanning element other whether to detect paper by this scanning element.
3. the means for correcting of scan-image as claimed in claim 1, it is characterized in that: described first paper feed wheel is taken turns with this second paper feed and driven by stepper motor, utilize this stepper motor to change the characteristic of rotation direction and speed along with the signal of telecommunication difference accepted, enable this control unit control this first paper feed and take turns the rotation direction and speed of taking turns with this second paper feed.
4. a bearing calibration for scan-image, is characterized in that, the bearing calibration of this scan-image comprises the steps:
Paper is taken turns by the first paper feed, the second paper feed wheel passes through in paper feed path one by one, and the sensing unit be simultaneously arranged on this paper feed path starts to monitor the position of paper and the distance between paper and paper;
When namely paper will pass through scanning element, this sensing unit sends a signal to control unit to start to scan paper to control this scanning element; And
When this sensing unit detects that the feed status of paper changes, then send a signal to this control unit, control the velocity of rotation of this first paper feed wheel and this second paper feed wheel and then avoid the transporting velocity of paper to change.
5. the bearing calibration of scan-image as claimed in claim 4, it is characterized in that, when this sensing unit detects that the feed status of paper changes, then send a signal to this control unit, the velocity of rotation controlling this first paper feed wheel and this second paper feed wheel and then the step avoiding the transporting velocity of paper to change comprise further:
Utilize the scanning sensor being arranged on this other sensing unit of this scanning element the leading edge of paper to be detected, and send a signal to this control unit when this scanning sensor is triggered;
After this control unit receives the signal of this scanning sensor, by this control unit controls this scanning element, scan paper;
When this scanning sensor still can sense paper, but be arranged on this other sensing unit of this first paper feed wheel detect that paper leaves from paper sensor time, send a signal to this control unit by this from paper sensor;
When this control unit receive this from paper sensor signal after just control this second paper feed wheel and reduce velocity of rotation, avoid paper excessive velocities and that scan-image is produced is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310589694.2A CN104660855A (en) | 2013-11-20 | 2013-11-20 | Correction device and correction method for scanning images |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310589694.2A CN104660855A (en) | 2013-11-20 | 2013-11-20 | Correction device and correction method for scanning images |
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| Publication Number | Publication Date |
|---|---|
| CN104660855A true CN104660855A (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310589694.2A Pending CN104660855A (en) | 2013-11-20 | 2013-11-20 | Correction device and correction method for scanning images |
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| Country | Link |
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| CN (1) | CN104660855A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023280173A1 (en) * | 2021-07-09 | 2023-01-12 | 华为技术有限公司 | Scanning method and electronic device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07304537A (en) * | 1994-05-10 | 1995-11-21 | Canon Inc | Sheet carrying device and image reader |
| CN2427845Y (en) * | 2000-05-17 | 2001-04-25 | 虹光精密工业股份有限公司 | Automatic paper feeding device with detecting front edge of paper function |
| US20080030809A1 (en) * | 2006-08-07 | 2008-02-07 | Canon Kabushiki Kaisha | Sheet conveyance device and image forming apparatus |
| CN101746627A (en) * | 2008-12-12 | 2010-06-23 | 柯尼卡美能达商用科技株式会社 | Sheet feeding device and image forming apparatus provided with the sheet feeding device |
-
2013
- 2013-11-20 CN CN201310589694.2A patent/CN104660855A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07304537A (en) * | 1994-05-10 | 1995-11-21 | Canon Inc | Sheet carrying device and image reader |
| CN2427845Y (en) * | 2000-05-17 | 2001-04-25 | 虹光精密工业股份有限公司 | Automatic paper feeding device with detecting front edge of paper function |
| US20080030809A1 (en) * | 2006-08-07 | 2008-02-07 | Canon Kabushiki Kaisha | Sheet conveyance device and image forming apparatus |
| CN101746627A (en) * | 2008-12-12 | 2010-06-23 | 柯尼卡美能达商用科技株式会社 | Sheet feeding device and image forming apparatus provided with the sheet feeding device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023280173A1 (en) * | 2021-07-09 | 2023-01-12 | 华为技术有限公司 | Scanning method and electronic device |
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Application publication date: 20150527 |
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