CN201830342U - Image scanning device with speed compensating unit - Google Patents
Image scanning device with speed compensating unit Download PDFInfo
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- CN201830342U CN201830342U CN2010202651625U CN201020265162U CN201830342U CN 201830342 U CN201830342 U CN 201830342U CN 2010202651625 U CN2010202651625 U CN 2010202651625U CN 201020265162 U CN201020265162 U CN 201020265162U CN 201830342 U CN201830342 U CN 201830342U
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Abstract
The utility model relates to an image scanning device with a speed compensating unit, which comprises a main scanning element (1), a transmission mechanism and a file moving passage. The utility model is characterized in the image scanning device comprises the speed compensating unit, and the speed compensating unit at least comprises one or one group of scanning speed recorders (2) and operation modules, wherein the scanning speed recorders (2) are arranged at one side of the file moving passage and are used for obtaining image pick-up data containing the speed characteristics when a file passes through the main scanning element (1), and the operation modules calculate scanning speed change parameter curves according to the image pick-up data obtained by the scanning speed recorders (2) and recover distortion images generated in the moving direction through the parameter curves.
Description
Technical field
The utility model relates to a kind of image-scanning device, particularly at the device of the enterprising line distortion compensation of scanning motion direction, by record high-velocity scanning process medium velocity change curve anamorphose is compensated.
Background technology
Existing its scanning theory of scanning device is basic identical, i.e. " line " scanning of document being carried out by photo-electric conversion element (as CCD, COMS, CIS etc.) is called as " main scanning ", and photo-electric conversion element is called " subscan " with respect to the parallel mobile scanning input of original copy.The implementation of " subscan " comprises parallel moving photoconductor conversion element and two kinds of parallel mobile original copys.The mode of parallel moving photoconductor conversion element is applied to the low speed product more, the then high speed products that are applied to of parallel mobile original copy more.
Flat bed scanner speed is lower, the movable supporting frame 6 that its common structure comprises the platform of finding a view, main scanning element 1 is installed and can be moved along the Y direction, document is placed on the platform of finding a view, movable supporting frame 6 at the uniform velocity by scanning area by main scanning element 1 recording image data.
Because the variation of document movement velocity is a key factor that causes image fault during scanning, existing solution then lays particular emphasis on the improvement of transmission mechanism or adopts complicated transducer and operator block, sacrifices sweep speed even.
Summary of the invention
The purpose of this utility model then is at above-mentioned the deficiencies in the prior art, gather demand for satisfying high-speed image, designed a kind of velocity compensation unit that is used for scanning means, the view data that obtains in the time of can be to high-velocity scanning is carried out velocity compensation, guarantees the quality of image.
The purpose of this utility model can realize by following measure: the utility model comprises main scanning element 1, is used for the transmission mechanism of mobile document, document moving conduit and velocity compensation unit, and the velocity compensation unit comprises one or one group the sweep speed register 2 and the computing module that are installed in document moving conduit one side at least.
Sweep speed register 2 is used for the omnidistance document of taking and contains the camera data of velocity characteristic by the process of main scanning element, and sweep speed register 2 is linear photo-electric conversion element, can be photo-electric conversion elements such as CCD, CIS.Computing module can adopt single-chip microcomputer, the scan speed change parameter curve of Y direction when computing module calculates document by the main scanning element according to the camera data of sweep speed register 2, and by the distorted image reduction of this parameter curve to being produced on the direction of motion.
At the opposite side of document moving conduit in the face of sweep speed register 2, be provided with the background baffle plate 5 of auxiliary measuring document movement velocity, this background baffle plate 5 can be color background or the background that has the range mark line, sweep speed register 2 obtains the sweep speed feature by taking the also variation in analysis background zone.
The beneficial effects of the utility model are:
Take the process of document by whole process by the main scanning element, movement velocity that can the most direct calculating document, and the distorted image that is produced on the direction of motion reduced.Neither need accurate transmission mechanism, also do not need complicated transducer and operator block, can realize the high-velocity scanning process.
Description of drawings
Fig. 1 is the principal diagram intention of the embodiment of the invention.
Fig. 2 is the principal diagram intention of another embodiment of the present invention.
Fig. 3 is the operation principle flow chart-pattern 1 of velocity compensation of the present utility model unit.
Fig. 4 is the operation principle flow chart-pattern 2 of velocity compensation of the present utility model unit.
Among the figure: 1, main scanning element; 2 sweep speed registers; 3 platforms of finding a view; 4, scaled-down version optical system; 5, background baffle plate; Movable supporting frame 6; Markings 7.
Embodiment
Rely on the basic general knowledge of this area below, the utility model is further described in conjunction with the accompanying drawings:
The image-scanning device that has the velocity compensation unit of the present utility model, main scanning element 1 sweep limits are the included scopes of the dotted arrow of directions X from X1 to X2.Sweep speed register 2 is installed in document moving conduit one side, and installation direction is perpendicular to the main scanning element.Sweep speed register 2 can an omnidistance line of taking on the document direction of motion, its scope is the included scope (as shown in Figure 1 and Figure 2) of the dotted arrow of Y direction from Y1 to Y2, and by the distorted image reduction of this parameter curve to being produced on the direction of motion.Because only take the video recording of a line of document motion, shooting speed and quality can be protected.Computing module can be installed in the optional position of image-scanning device, links with main scanning element 1 and sweep speed register 2, and distorted image is analyzed and reduced.
Sweep speed register 2 can obtain the sweep speed curve with respect to the video recording of background motion by obtaining document edges.For flat bed scanner, can obtain the movement velocity curve of main scanning element 1, i.e. the sweep speed curve by the movement locus of record movable supporting frame 6.
By the resolution scan breadth of 200DPI is that the document of X01*Y01 inch is an example, scanning back image be the X02*Y02 pixel (X02=X01*200DPI, Y02=Y01*200DPI).Normal scan speed be the V page or leaf/minute, the fast and the slowest instant scanning speed of scanning device be V1 and V2 (V1＞V＞V2), the difference of the instantaneous velocity that the drive system of scanning device produces should be controlled at ± 30% within.Because instantaneous speed difference has caused the distortion of image, promptly image produces on the Y direction and stretches or contraction, can revise by the velocity compensation unit.
The resolution of directions X main scanning photo-electric conversion element 1 shooting should be more than or equal to X2 pixel, camera speed should more than or equal to the V*Y2 hardwood/minute.The resolution of Y scanning direction tachograph 2 shooting should be more than or equal to Y02 pixel, camera speed should more than or equal to the V*Y2 hardwood/minute.
The image that the Y direction is taken is a background image, if document does not enter scanning area, then Y direction background image can not change with the document motion, and after document one lateral edges entered scanning area, the image of Y direction then changed with the process of scanning.Along with document moves in the Y direction, main scanning photo-electric conversion element 1 obtains file and picture by Fixed Time Interval, thereby forms one group of image LX, quantity is n (LX1, LX2, LX3 ... LXn), sweep speed register 2 also obtains the image that document edges moves by Fixed Time Interval simultaneously, thereby form another group image LY, quantity is m (LY1, LY2, LY3 ... LYm).Computing module extracts active data in the corresponding LX image sets by the LY image sets is analyzed, and reconfigures and forms formal image sets LXX, and the most revised LXX image sets merges in order can form final file and picture.
Embodiment 1:
Adopt structure as shown in Figure 1, sweep speed register 2 can be fixed on the platform outside of finding a view along the Y direction, and markings 7 are installed at movable supporting frame 6 outsides and sweep speed register 2 corresponding upper edge, position directions Xs, markings 7 are positioned in the middle of sweep speed register 2 and the background baffle plate 5.Sweep speed register 2 can the whole Y direction of establishing shot background, can before sweep speed register 2, settle a scaled-down version optical system 4, scaled-down version optical system 4 can realize by one group of lens.
The background of the whole Y direction of sweep speed register (2) establishing shot and motion markings therein can be determined sweep speed by the position of distinguishing mark line when scanned document.
Embodiment 2:
Adopt structure as shown in Figure 2, sweep speed register 2 is fixed on the movable supporting frame 6, sweep speed register 2 is in company with movable supporting frame 6 movement background of follow shot Y direction together when scanned document.At this moment, sweep speed register 2 captured background areas are a moving region (on-fixed are taken whole background area), and therefore the striped of the background baffle plate 5 corresponding with it can adopt the striped of equidistant or gradual change with auxiliary measuring movement velocity and position;
Embodiment 3:
Under low precision mode of operation, adopt the structure of embodiment 1, stepping is 1, the workflow of computing module as shown in Figure 3:
Directions X main scanning photo-electric conversion element 1 camera speed be set at the V*Y2 hardwood/minute, Y scanning direction tachograph 2 shooting resolution are Y02 pixel (200DPI), Y scanning direction tachograph 2 camera speeds also be set at the V*Y2 hardwood/minute.Two set of pieces are made a video recording synchronously, form two groups of image sets (being m=n ≈ Y02) that quantity is identical.
The image sets of comparative analysis LY one by one under normal speed, should detect in each adjacent image document edges and can move forward a pixel and cover corresponding background, and this moment, image need not be revised, and directly the LX image with correspondence deposits formal image sets LXX in.Very fast as scanning motion speed, when accumulated error surpasses 1 pixel, can cause in the adjacent image background position to move forward and surpass a pixel; Slower as scanning motion speed, when accumulated error surpasses 1 pixel, can cause in the adjacent image background position to be moved to producing.For the distortion that produces at a high speed, the mean value that calculates adjacent front and back two secondary normal LX images forms new image and preserves into formal image sets LXX as remedying; Distortion for low speed produces will not detect the LX image-erasing of the correspondence that moves the background position, and the mean value that perhaps calculates the how secondary LX image that belongs to same position forms new image and preserves into formal image sets LXX as remedying.The most revised LXX image sets merges in order can form final file and picture.
Embodiment 4:
Under the high accuracy mode of operation, adopt the structure of embodiment 2, stepping is 2, the workflow of computing module as shown in Figure 4:
Directions X main scanning photo-electric conversion element 1 camera speed be set at the V*Y02*2 hardwood/minute, Y scanning direction tachograph 2 shooting resolution are 400DPI, Y scanning direction tachograph 2 camera speeds also be set at the V*Y02*2 hardwood/minute.Two set of pieces are made a video recording synchronously, form two groups of image sets (being m=n ≈ Y02*2) that quantity is identical.
Because the machine driving velocity variable of scanning device is limited, generally can not surpass ± 30%.And owing to the sample frequency of LX and LY all is doubled, so can be with first width of cloth LY1 image as reference, successive image in the comparative analysis LY image sets one by one, thereby find all corresponding LX images that meet background position mobile condition to preserve into formal image sets LXX, other ineligible images can be given up in the LX image sets.Merge in order through the LXX image sets of screening the most at last and can form final file and picture.
During concrete enforcement, can adopt other the camera speed and the combination of resolution, the workflow of reference example 3 and embodiment 4 is finished correction to image by the method for interpolation calculation.
More than each embodiment be not to concrete restriction of the present utility model, do not breaking away from claims restricted portion of the present utility model, can make all concrete modifications to this device.
Claims (5)
1. the image-scanning device that has the velocity compensation unit, comprise main scanning element (1), transmission mechanism, it is characterized in that being: this image-scanning device comprises a velocity compensation unit, described velocity compensation unit comprises one or one group the sweep speed register (2) and the computing module that are installed in document moving conduit side direction at least, wherein: sweep speed register (2) contains the camera data of velocity characteristic when being used to obtain document by main scanning element (1), the camera data that computing module obtains according to sweep speed register (2) calculates the scan speed change parameter curve of document, and by this parameter curve the distorted image that is produced on the direction of motion is reduced.
2. the image-scanning device that has the velocity compensation unit according to claim 1 is characterized in that: described sweep speed register (2) is linear photo-electric conversion element, and installation direction is perpendicular to main scanning element (1).
3. the image-scanning device that has the velocity compensation unit according to claim 1, it is characterized in that: at the opposite side of document moving conduit in the face of sweep speed register (2), be provided with the background baffle plate (5) of auxiliary measuring document movement velocity, this background baffle plate (5) is color background or the background that has the range mark line.
4. the image-scanning device that has the velocity compensation unit according to claim 1, it is characterized in that: described sweep speed register (2) is fixed on the movable supporting frame (6), sweep speed register (2) is in company with movable supporting frame (6) movement background of follow shot Y direction together when scanned document, and the striped of the background baffle plate (5) corresponding with it adopts the striped of equidistant or gradual change with the auxiliary measuring movement velocity.
5. the image-scanning device that has the velocity compensation unit according to claim 1, it is characterized in that: described sweep speed register (2) is fixed on the platform outside of finding a view along the Y direction, and the position upper edge directions X corresponding with sweep speed register (2) installed markings (7) outside movable supporting frame (6), markings (7) are positioned in the middle of sweep speed register (2) and the background baffle plate (5), the background of the whole Y direction of sweep speed register (2) establishing shot and motion markings therein when scanned document.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202651625U CN201830342U (en) | 2010-07-21 | 2010-07-21 | Image scanning device with speed compensating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202651625U CN201830342U (en) | 2010-07-21 | 2010-07-21 | Image scanning device with speed compensating unit |
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| CN201830342U true CN201830342U (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202651625U Expired - Fee Related CN201830342U (en) | 2010-07-21 | 2010-07-21 | Image scanning device with speed compensating unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281380A (en) * | 2011-09-09 | 2011-12-14 | 吴伟佳 | Image scanning device with combination light path and speed compensation unit |
| CN109374636A (en) * | 2018-11-29 | 2019-02-22 | 成都铁安科技有限责任公司 | Pantograph image acquisition system, detection system and detection method |
-
2010
- 2010-07-21 CN CN2010202651625U patent/CN201830342U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281380A (en) * | 2011-09-09 | 2011-12-14 | 吴伟佳 | Image scanning device with combination light path and speed compensation unit |
| CN109374636A (en) * | 2018-11-29 | 2019-02-22 | 成都铁安科技有限责任公司 | Pantograph image acquisition system, detection system and detection method |
| CN109374636B (en) * | 2018-11-29 | 2021-05-25 | 成都铁安科技有限责任公司 | Pantograph image acquisition system, detection system and detection method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Addressee: Wu Weijia Document name: Notification of Termination of Patent Right |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20140721 |
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| EXPY | Termination of patent right or utility model |