CN104519235A - Image scanning calibration device and method - Google Patents
Image scanning calibration device and method Download PDFInfo
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- CN104519235A CN104519235A CN201310461589.0A CN201310461589A CN104519235A CN 104519235 A CN104519235 A CN 104519235A CN 201310461589 A CN201310461589 A CN 201310461589A CN 104519235 A CN104519235 A CN 104519235A
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- paper
- feed roller
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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
- H04N1/0476—Indicating the scanning velocity
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- Facsimile Scanning Arrangements (AREA)
Abstract
The invention discloses an image scanning calibration device which comprises a scanning unit, a paper feeding device, a paper sensing device and a control unit. The scanning unit is disposed in a paper feeding path and used for scanning passing paper. The paper feeding device at least comprises a first paper feeding wheel and a second paper feeding wheel, wherein the first paper feeding wheel is disposed on the upstream of the scanning unit, the second paper feeding wheel is disposed on the downstream of scanning unit, no other paper feeding wheels exist between the first paper feeding wheel and the second paper feeding wheel, the paper feeding speed of the second paper feeding wheel is higher than that of the first paper feeding wheel, and the distance between the first paper feeding wheel and the second paper feeding wheel is smaller than the length of paper. The paper sensing device is disposed in the paper feeding path to monitor paper locations and paper feeding speed. The control unit is electrically connected with the scanning unit and the paper sensing device and controls the scanning frequency of the scanning unit according to paper feeding speed and paper locations. The image scanning calibration device is easy to produce and maintain. The invention further provides an image scanning calibration method.
Description
Technical field
The present invention relates to a kind of means for correcting and bearing calibration of scan image, particularly relate to a kind of means for correcting and the bearing calibration that adopt numerically controlled scan image.
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 autoscanner 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 pushing 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 extraction 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 autoscanner 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 pushing roller, makes process during paper tail end disengaging paper pushing roller comparatively gentle, and then avoid paper to accelerate suddenly; And at United States Patent (USP) the 6th, be then on paper pushing roller, install an actuating device in 530, No. 569, when the tail end of paper prepares just to discharge paper pushing roller when will depart from paper pushing 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 autoscanner 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 means for correcting of the scan image safeguarded and bearing calibration.
For reaching above-mentioned purpose, the means for correcting of scan image of the present invention comprises: one scan unit, is arranged in paper path and is converted to the signal of telecommunication with the paper scanned through and by the word on paper or image; One paper feeder, wherein at least comprises one first feed roller and one second feed roller; Wherein the first feed roller is arranged on the upstream of scanning element, and the second feed roller is arranged on the downstream of scanning element, without other feed rollers between first feed roller to the second feed roller, the paper feeding speed of the second feed roller is higher than the first feed roller, and the distance length between the first feed roller and the second feed roller is less than the length of paper; One paper induction installation, be arranged in paper path to monitor position and the transporting velocity of paper, and a control unit, be electrical connected with scanning element and paper induction installation, and according to the different and scanning frequency of gated sweep unit of the transporting velocity of paper and position.
In this embodiment, above-mentioned paper induction installation comprises one from paper sensor and one scan transducer; Should be installed near the first feed roller from paper sensor, scanning sensor is then installed near scanning element.
Wherein, above-mentioned scanning sensor is set to a sensitive switch, is above-mentionedly then set to one group of ultrasonic sensor from paper sensor.
In the present invention, the step of correct scan image is as follows:
Paper by the first feed roller of paper feeder and the second feed roller by the scanning element be conducted through in paper path one by one, first feed roller is arranged on the upstream of scanning element, and without other feed rollers between the first feed roller and scanning element, and the second feed roller is arranged on the downstream of scanning element, and also without other feed rollers between the second feed roller and scanning element, the paper feeding speed of the second feed roller is higher than the first feed roller, and the distance length between the first feed roller and the second feed roller is less than the length of paper; The position of paper induction installation monitoring paper and transporting velocity; When namely paper will pass through scanning element, paper induction installation sends a signal to control unit to start to scan paper with gated sweep unit, by this word on paper or image will be converted to the signal of telecommunication; And when transducer detects the feed status of paper or transporting velocity changes, then send a signal to control unit, to control and to change the scanning frequency of scanning element.
The step changing scan pattern in this embodiment according to paper sheet delivery state is as follows:
Paper by the first feed roller of paper feeder and the second feed roller by the scanning element be conducted through in paper path one by one, first feed roller is arranged on the upstream of scanning element, and without other feed rollers between the first feed roller and scanning element, and the second feed roller is arranged on the downstream of scanning element, and also without other feed rollers between the second feed roller and scanning element, the paper feeding speed of the second feed roller is higher than the first feed roller, and the distance length between the first feed roller and the second feed roller is less than the length of paper.
Then paper induction installation is utilized to monitor position and the transporting velocity of paper; When namely paper will pass through scanning element, paper induction installation sends a signal to control unit to start to scan paper with gated sweep unit, by this word on paper or image will be converted to the signal of telecommunication; And when transducer detects the feed status of paper or transporting velocity changes, then send a signal to control unit, to control and to change the scanning frequency of scanning element.
In a further preferred embodiment, the step changing scanning frequency is as follows:
When the tail end of paper does not depart from the first feed roller, scanning element and intermittent the carrying out of scanning light source start and close, the time that wherein scanning element starts was called for the first sweep time, the time of closing is called time out, the time that scanning light source is opened is lighting time, and the time that scanning light source is closed was the first fall time.And when the tail end of paper departs from the first feed roller, the time change that scanning element and scanning light source start and close, the time that wherein scanning element starts was called for the second sweep time, the time of closing is called time out, the time that scanning light source is opened is lighting time, and the time that scanning light source is closed was the second fall time.
Wherein the difference of the first sweep time and the second sweep time is identical with the difference of the first fall time and the second fall time, the scanning frequency of scanning element is made to remain synchronous with the flicker frequency of scanning light source, in addition, first sweep time and the second sweep time are all greater than lighting time, and lighting time remains unchanged, to guarantee that the exposure of paper under different scanning frequencys all remains unchanged.
Beneficial effect of the present invention is, in the present invention, by the difference detecting paper feed status and transporting velocity, and the scanning frequency of synchronous adjustment scanning element carries out the correction of scan image.Compared with the method taking mechanical type to adjust in prior art, the present invention does not need to install extra means, and the error produced after mechanical organ 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 autoscanner.
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 image correcting step of the present invention.
Fig. 6 is the generalized section that the present invention starts when scanning.
Generalized section when Fig. 7 is switched scan pattern of the present invention.
Fig. 8 and Fig. 9 is the schematic diagram coordinating paper sheet delivery speed to change scan pattern.
Wherein, description of reference numerals is as follows:
10 paper 20 paper feeders
21 paper path 22 first feed rollers
Embodiment
For describing technology contents of the present invention, structural feature, the object reached and effect in detail, below now illustrating and coordinating accompanying drawing to be explained in detail.
Now refer to Fig. 4, known automatic sheet-feed scanner provided is when carrying paper, and after paper tail end departs from feed roller clamping, the speed of paper will be accelerated.Thus cause scan image shorter than the original image on paper.For overcoming the above problems, the means for correcting of the scan image in the present invention comprises: one scan unit 30, to be arranged in paper path 21 with the paper scanned through so that the word on paper or image are converted to the signal of telecommunication; One paper feeder 20, at least comprises one first feed roller 22 and one second feed roller 23; Wherein the first feed roller 22 is arranged on the upstream of scanning element 30, and without other feed rollers between the first feed roller 22 and scanning element 30, and the second feed roller 23 is arranged on the downstream of scanning element 30, and also without other feed rollers between the second feed roller 23 and scanning element 30, the paper feeding speed of the second feed roller 23 is a little more than the first feed roller 22, such as, the paper feeding speed of paper feeding speed ratio first feed roller 22 of the second feed roller 23 exceeds 2%, and the distance length between the first feed roller 22 and the second feed roller 23 is less than the length of paper; One paper induction installation 40, be arranged in paper path 21 to monitor position and the transporting velocity of paper, and a control unit 50, be electrical connected with scanning element 30 and paper induction installation 40, and according to the different and scan pattern of gated sweep unit 30 of the transporting velocity of paper and position, correct by this because paper feeding speed changes the image deflects caused.It should be noted that the amplitude that the paper feeding speed of paper feeding speed ratio first feed roller 22 of the second feed roller 23 of the embodiment of the present invention exceeds can change according to actual demand.
In this embodiment, above-mentioned paper induction installation 40 comprises one from paper sensor 41 and one scan transducer 42; Should be installed near the first feed roller 22 from paper sensor 41, scanning sensor 42 is then installed near scanning element 30.And monitoring paper passes through and leaves the time point of the first feed roller 22 and scanning element 30 respectively.When paper passes through or leave the first feed roller 22 with scanning element 30, just signal can be sent to control unit 50 from paper sensor 41 and scanning sensor 42, and use the time estimating that paper generation transporting velocity changes, and then gated sweep unit 30 changes scan pattern.
And wherein, above-mentioned scanning sensor 42 is set to a sensitive switch, judged that whether paper is by the position set by scanning sensor 42 by whether monitoring sensitive switch triggers.Above-mentionedly then be set to one group of ultrasonic sensor from paper sensor 41, because ultrasonic sensor has the ability measuring paper sheet thickness, therefore except judging that whether paper is by except the position of paper sensor 41, synchronously can also judge whether the situation that multiple paper feeding occurs.
Refer to Fig. 5 again, the step of correct scan image is as follows in the present invention.
When autoamtic paper feeding formula scanner starts to scan, paper by paper feeder 20 by one by one be conducted through paper path 21, each transducer be simultaneously installed in paper path 21 starts to monitor the position of paper; When namely paper will pass through scanning element 30, transducer sends a signal to control unit 50 to start to scan paper with gated sweep unit 30; And when transducer detects the feed status of paper or transporting velocity changes, then send a signal to control unit 50, to control and to change the sweep speed of scanning element 30; Until scanned and paper leaves scanning element 30, then the view data of scanning gained is sequentially spliced into complete image.By immediately detecting paper feed status and changing sweep speed when scanning element 30 extracts image, can effectively solve because paper sheet delivery speed changes the image deflects caused.
And in this embodiment, the acceleration occurred after disengaging first feed roller 22 in order to avoid paper causes the ratio of scan image to change, therefore need to distinguish paper accelerates through scanning element 30 by scanning element 30 and paper time point with normal speed, its step is as follows:
Please refer to the drawing 6, first, when autoamtic paper feeding formula scanner starts to scan, first utilize and be arranged on the leading edge that the other scanning sensor 42 of scanning element 30 detects paper, when scanning sensor 42 is triggered, paper is about to by scanning element 30, now scanning sensor 42 sends a signal to control unit 50, then after control unit 50 receives the signal of scanning sensor 42, by control unit 50 gated sweep unit 30, scans paper.
Please refer to the drawing 7 again, and after the tail end of paper departs from the first feed roller 22, the transporting velocity of paper will be made under the pullling of the second feed roller 23 to accelerate suddenly, and the time therefore departing from the first feed roller 22 in this embodiment by detecting paper infers when paper can accelerate.Therefore when scanning sensor 42 still can sense paper, but be arranged on the first feed roller 22 other detect that paper leaves from paper sensor 41 time, it is the moment that namely tail end of paper will depart from the first feed roller 22, now send a signal to control unit 50 by from paper sensor 41, and the frequency of control unit 50 when just gated sweep unit 30 adds short scan paper after receiving the signal from paper sensor 41.
Now refer to Fig. 6 to Fig. 9, in order to not affect exposure when accelerating scanning frequency, the step adjusting scanning frequency in this preferred embodiment is as follows:
First when the tail end of paper 10 does not depart from the first feed roller, scanning element 30 scans paper 10 with original frequency, now intermittent the carrying out of scanning element 30 starts and closes, for convenience of description, below the time that scanning element 30 starts is called first sweep time A, and close time be called time out B.And in order to obtain correct exposure, scanning light source (not shown) also coordinates the intermittent unlatching of scanning element 30 and closedown, the time of opening hereinafter referred to as scanning light source is lighting time C, and the time that scanning light source is closed is the first fall time D.In this embodiment, first sweep time A be set to for 8 unit interval, time out B was then 1 unit interval, and lighting time C was 5 unit interval, and the first fall time D was 4 unit interval.
And when paper 10 tail end departs from the first feed roller 22 and makes paper 10 accelerate, the speed of time coordination paper 10 movement that scanning element 30 and light source start and close adjusts.In this embodiment, scanning element 30 start time and scanning light source close time change identical length, be below called second sweep time A ' and the second fall time D '.In order to increase the scanning times of scan unit 30, second sweep time A ' shortened to for 6 unit interval, time out B maintained for 1 unit interval, for avoiding affecting exposure, lighting time C was also maintained for 5 unit interval, but the second fall time D ' then shortened to for 2 unit interval.
The knots modification of the knots modification of sweep time (A-A ') and fall time (D-D ') is identical, and the flicker frequency of the scanning frequency of scanning element 30 and scanning light source is synchronously accelerated.In addition, before and after changing first sweep time A and second sweep time A ' be all greater than the lighting time C of scanning light source, and lighting time C is remained unchanged, can guarantee that the exposure of paper under different scanning frequencys all remains unchanged.
From describing above, the present invention is by the difference detecting paper feed status and transporting velocity, and the scanning frequency of synchronous adjustment scanning element 30 is to carry out the correction of scan image.Compared with the method taking mechanical type to adjust in prior art, the present invention does not need to install extra means, and the error produced after mechanical organ 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.
In sum, although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Technical staff in the technology of the present invention field, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on the right person of defining.
Claims (8)
1. a means for correcting for scan image, is characterized in that comprising:
One scan unit, is arranged in paper path and is converted to the signal of telecommunication with the paper scanned through and by the word on paper or image;
One paper feeder, wherein at least comprises one first feed roller and one second feed roller; First feed roller is arranged on the upstream of scanning element, and the second feed roller is arranged on the downstream of scanning element, without other feed rollers between first feed roller to the second feed roller, the paper feeding speed of the second feed roller is higher than the first feed roller, and the distance length between the first feed roller and the second feed roller is less than the length of paper;
One paper induction installation, is arranged on to monitor position and the transporting velocity of paper in paper path, and
One control unit, is electrical connected with scanning element and paper induction installation, and according to the different and scanning frequency of gated sweep unit of the transporting velocity of paper and position.
2. the means for correcting of scan image as claimed in claim 1, is characterized in that: described paper induction installation comprises one from paper sensor and one scan transducer; Should be installed near the first feed roller from paper sensor, scanning sensor is then installed near scanning element.
3. the means for correcting of scan image as claimed in claim 2, is characterized in that: described scanning sensor is set to a sensitive switch, is above-mentionedly then set to one group of ultrasonic sensor from paper sensor.
4. the means for correcting of scan image as claimed in claim 1, is characterized in that: the paper feeding speed of described second feed roller exceeds 2% than the paper feeding speed of described first feed roller.
5. a bearing calibration for scan image, is characterized in that, its step comprises:
Paper by the first feed roller of paper feeder and the second feed roller by the scanning element be conducted through in paper path one by one, first feed roller is arranged on the upstream of scanning element, and without other feed rollers between the first feed roller and scanning element, and the second feed roller is arranged on the downstream of scanning element, and also without other feed rollers between the second feed roller and scanning element, the paper feeding speed of the second feed roller is higher than the first feed roller, and the distance length between the first feed roller and the second feed roller is less than the length of paper;
The position of paper induction installation monitoring paper and transporting velocity;
When namely paper will pass through scanning element, paper induction installation sends a signal to control unit to start to scan paper with gated sweep unit, by this word on paper or image will be converted to the signal of telecommunication; And
When transducer detects the feed status of paper or transporting velocity changes, then send a signal to control unit, to control and to change the scanning frequency of scanning element.
6. the bearing calibration of scan image as claimed in claim 5, is characterized in that, the step changing scan pattern according to paper sheet delivery state is as follows:
Utilize the scanning sensor being arranged on the other paper induction installation 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 paper induction installation of the first feed roller detect that paper leaves from paper sensor time, by sending a signal to control unit from paper sensor; And
The frequency of control unit when just gated sweep unit adds short scan paper after receiving the signal from paper sensor.
7. scan Image Correction Method as claimed in claim 5, is characterized in that, the step changing scanning frequency is as follows:
When the tail end of paper does not depart from the first feed roller, scanning element and intermittent the carrying out of scanning light source start and close, the time that wherein scanning element starts was called for the first sweep time, the time of closing is called time out, the time that scanning light source is opened is lighting time, and the time that scanning light source is closed was the first fall time;
When the tail end of paper departs from the first feed roller, the time change that scanning element and scanning light source start and close, the time that wherein scanning element starts was called for the second sweep time, the time of closing is called time out, the time that scanning light source is opened is lighting time, and the time that scanning light source is closed was the second fall time;
Wherein the difference of the first sweep time and the second sweep time is identical with the difference of the first fall time and the second fall time, the scanning frequency of scanning element is made to remain synchronous with the flicker frequency of scanning light source, in addition, first sweep time and the second sweep time are all greater than lighting time, and lighting time remains unchanged, to guarantee that the exposure of paper under different scanning frequencys all remains unchanged.
8. the means for correcting of scan image as claimed in claim 1, is characterized in that: the paper feeding speed of described second feed roller exceeds 2% than the paper feeding speed of described first feed roller.
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| CN201310461589.0A CN104519235A (en) | 2013-09-30 | 2013-09-30 | Image scanning calibration device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310461589.0A CN104519235A (en) | 2013-09-30 | 2013-09-30 | Image scanning calibration device and method |
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| CN104519235A true CN104519235A (en) | 2015-04-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108418990A (en) * | 2018-03-30 | 2018-08-17 | 广州建翎电子技术有限公司 | A kind of anti-entanglement international trade contract scanning means |
| CN109151247A (en) * | 2018-09-18 | 2019-01-04 | 深圳市思乐数据技术有限公司 | A kind of image scan method, device and reader |
| CN109873915A (en) * | 2019-01-16 | 2019-06-11 | 北京五岳鑫信息技术股份有限公司 | A kind of compensation device and method of scanner |
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| CN201383840Y (en) * | 2009-04-24 | 2010-01-13 | 崴强科技股份有限公司 | Automatic file processing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108418990A (en) * | 2018-03-30 | 2018-08-17 | 广州建翎电子技术有限公司 | A kind of anti-entanglement international trade contract scanning means |
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| CN109151247A (en) * | 2018-09-18 | 2019-01-04 | 深圳市思乐数据技术有限公司 | A kind of image scan method, device and reader |
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