CN106791259B - Large format scanner and scan method - Google Patents
Large format scanner and scan method Download PDFInfo
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- CN106791259B CN106791259B CN201710081018.2A CN201710081018A CN106791259B CN 106791259 B CN106791259 B CN 106791259B CN 201710081018 A CN201710081018 A CN 201710081018A CN 106791259 B CN106791259 B CN 106791259B
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- 230000007246 mechanism Effects 0.000 claims abstract description 72
- 230000005540 biological transmission Effects 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 13
- 230000033001 locomotion Effects 0.000 claims description 27
- 238000003708 edge detection Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 8
- 238000010408 sweeping Methods 0.000 claims description 3
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- 238000003384 imaging method Methods 0.000 abstract description 27
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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
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
- H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors
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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
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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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Abstract
The present invention discloses a kind of large format scanner, including probe (3), transmission mechanism (4)；Imaging sensor (2) is installed, probe (3) couples with transmission mechanism (4) in probe (3)；Probe (3) is moved under the drive of transmission mechanism (4)；Probe (3) is mobile relative to original copy (1) with Y-direction both direction in X direction respectively and carries out the image scanning of sectional to original copy (1) by imaging sensor (2) in moving process.After technical solution using combined type fractional scanning, the sweep amplitude of imaging sensor and the breadth size of original copy are substantially unrelated, can flexibly scan the original copy of various breadths, are particularly suitable for the Manuscript scanner of special super large breadth；Overcome imaging sensor in the prior art scanning find a view width must corresponding mating restrictive condition with the breadth of original copy.
Description
Technical field
The present invention relates to a kind of large format scanners, and in particular to uses the technical solution of combined type fractional scanning, reduces
The manufacturing cost of large format scanner promotes the scanning quality and application range of large format scanner, belongs to large format scanner
The technical field of manufacture and scan image splicing and processing.
Background technology
The mentality of designing of scan mode and middle-size and small-size scanner used by existing large format scanner is similar, i.e.,
Setting includes the probe of imaging sensor in X direction, and probe is moved relative to original copy along Y-direction, by image sensing
Device acquires manuscript image data successively, and is spliced to form complete original image.As platform-type/flatbed scanner uses original copy
The pattern of fixed movable scan head, paper feeding scanner fix the pattern of mobile original copy using probe.
It for paper feeding scanner, is scanned in original copy moving process, since the material and quality of original copy are poor
Different, original copy movement speed will produce irregular fluctuation sometimes, and then influence scanning accuracy, and the influence of this velocity perturbation
It is difficult to be corrected, it is common practice that evaded by improving the accuracy of paper feed mechanism.
In fact, large format scanner and middle-size and small-size scanner include mainly there are some differences：
1, transmission mechanism：By taking platform-type/flatbed scanner as an example, high-precision transmission may be used in large format scanner
Mechanism（Such as high-precision lead screw and stepper motor）, mechanical movement error scanning accuracy is influenced to weaken, and middle-size and small-size scanning
Instrument is cost limited to be difficult to adopt high-precision transmission mechanism；And for the large format scanner of paper feed type, due to the expansion of breadth
Greatly, the accuracy of paper feed mechanism is also influenced by some；
2, imaging sensor：Large format scanner generally use multiple images sensor synchronous acquisition image data arranged side by side
（Such as CIS contact-type image sensors）, then carry out by the overlapping region of scanning the image data of multiple images sensor acquisition
Splicing；Also have and be acquired using single image sensor（Such as high-precision CCD or cmos image sensor）, image at this time
The cost of sensor is higher and needs the high-precision camera lens of mating use, needs to use larger sky when designing optical circuit
Between or use more complicated light channel structure, advantage be the reduction of image mosaic process, picture quality it is high, the disadvantage is that volume compared with
Greatly, of high cost；And the most of monomer imaging sensor acquisition mode, technology maturation, reliable and stable of all using of middle-size and small-size scanner；
3, sweep speed：The data volume that the imaging sensor of large format scanner generates is big, and the bottleneck of sweep speed is main
It is the hardware configuration and treatment effeciency of mating image data processing system；For middle-size and small-size scanner, the bottle of sweep speed
Neck essentially consists in the speed and precision of transmission mechanism movement；
4, manufacturing cost：For different different using the breadth of original copy, and existing scanner is mostly for solid
Tentering face is designed exploitation, the usage amount of large format scanner is smaller and specification is more therefore compatible and autgmentability all compared with
It is poor, of high cost, and middle-size and small-size scanner uniform specification, used imaging sensor and probe frame have formed complete product
Line, it is at low cost.
It can be seen that if the mentality of designing for continuing to use middle-size and small-size scanner go design large format scanner, using effect and
Cost is difficult to take into account.
Reference paper：
1, Chinese patent：Utility model, application number 01278852.X, " flat plate type CCD scanner head support light path structure "；
2, Chinese patent：Patent of invention, application number 201280028881.7, " paper feeding scanner and flatbed scanner
System "；
3, Chinese patent：Patent of invention, application number 201280019866.6 " utilize the substantially Surface scan system of joining method
The scan method of system "；
4, Chinese patent：Patent of invention, application number 201510390980.5, " a kind of modular broad width scanning image is adopted
Collecting system and implementation method "；
5, Chinese patent：Patent of invention, application number 201010157891.3, " scanning information bracket assembly moves substantially
Surface scan instrument and its scan method ".
Invention content
For technical problem more than solution, the present invention uses the technical solution of combined type fractional scanning, i.e., scanning motion is by X
Direction and Y-direction both direction are composed；Including probe, transmission mechanism；Imaging sensor is installed in probe,
Probe couples with transmission mechanism, probe is moved under the drive of transmission mechanism；Probe respectively in X direction with the side Y
Image that is mobile relative to original copy to both direction and carrying out sectional to original copy by imaging sensor in moving process is swept
It retouches；
Wherein, include imaging sensor and the scanning light structures and optics mating with imaging sensor in probe
Imaging arrangement；Its structure type is varied, can be similar with the scanner head frame in reference 1；Wherein, imaging sensor
2 preferentially use CCD line image sensors, and CIS line styles contact-type image sensor or area image can also be used to sense
Device（Such as reference paper 5）.
Concrete structure is divided into two kinds：
First, platform-type/flatbed scanner：Including probe, transmission mechanism, panorama viewfinder window；Driver
Structure includes being moved for realizing the X-axis mobile mechanism of sectional scanning motion and for realizing the Y-axis of scanning section motion switch
Motivation structure, transmission mechanism drive probe to be moved back and forth in X direction with Y-direction both direction respectively, the figure in probe
As the motion scan range of sensor covers the viewfinder range of panorama viewfinder window；
Second, paper feeding scanner：Transmission mechanism, area including probe, for realizing sectional scanning motion
Section viewfinder window, for realizing scanning section switching when move original copy paper feed mechanism；Transmission mechanism includes X-axis moving machine
Structure, transmission mechanism drive probe to move back and forth in X direction, and the motion scan range of the imaging sensor in probe is covered
The viewfinder range of cover region section viewfinder window；Start paper feed mechanism between each section of scanning and moves original copy realization scanning section along Y-direction
Switching.
The scan method of large format scanner of the present invention is：In scanning process, the scanning of image taking sensor is found a view width
Original copy is divided into multiple scanning sections along Y-direction on the basis of degree and carries out fractional scanning：
First, probe is aligned to the first segment section to be scanned of original copy, drives probe to move in X direction by transmission mechanism
It is dynamic that image scanning is carried out to the first segment of original copy section to be scanned；
After the completion of the scanning of the first segment of original copy section to be scanned, probe is driven to be moved along Y-direction by transmission mechanism
Or original copy 1 is moved along Y-direction so that probe is directed at the second segment section to be scanned of original copy by paper feed mechanism；
It drives probe to move in X direction by transmission mechanism again to sweep the second segment of original copy region to be scanned progress image
It retouches；
Then, scanning of the cycle up to completion to whole picture original copy according to this；
Wherein：
For platform-type/flatbed scanner：Original copy is positioned in panorama viewfinder window, probe is reciprocal in X direction
Mobile fractional scanning original image drives probe to be moved along Y-direction so that probe pair between every section of scanning by transmission mechanism
It accurate next section to be scanned and then is scanned again；And cycle completes scanning process successively；
For paper feeding scanner：The first segment of original copy 1 section to be scanned is transported to section along Y-direction by paper feed mechanism
The corresponding position of viewfinder window simultaneously suspends conveying；The original image of probe motion scan first segment section to be scanned in X direction,
Continue conveying original copy along Y-direction by paper feed mechanism between every section of scanning, next section to be scanned is transported to section viewfinder
The corresponding position of mouth simultaneously suspends conveying and then is scanned again；Cycle completes scanning process, again by paper feed mechanism by original copy successively
It sends out.
Under normal conditions, X-direction and Y-direction are that orthogonal and probe is kept and original copy during scanning motion
Plane moves in parallel.But it is also not excluded in special circumstances, using unconventional scanning angle or scanning motion pattern, such as taking
Scape window surface is flexure plane, broken line face etc.；But only need to ensure the motion scan range covering of imaging sensor in probe
The viewfinder range of viewfinder window.
The beneficial effects of the invention are as follows：
1, after using the technical solution of combined type fractional scanning, the sweep amplitude of imaging sensor and the breadth size of original copy
Substantially unrelated, the original copy of various breadths can be flexibly scanned, the Manuscript scanner of special super large breadth is particularly suitable for；It overcomes existing
Having the scanning of imaging sensor in technology to find a view width must corresponding mating restrictive condition with the breadth of original copy；
2, common middle-size and small-size imaging sensor and probe frame can be used, yield is high, at low cost；
3, for platform-type/flatbed scanner, the problem that substantially Surface scan time line structure design difficulty is big is avoided；
4, for paper feeding scanner, it is stationary state that technical scheme of the present invention, which is designed as the original copy in fractional scanning,
The problem of avoiding because of original copy movement velocity influence of fluctuations scanning accuracy.
Description of the drawings
Attached drawing 1：The vertical view of flatbed scanner structure chart；
Attached drawing 2：The sectional view along A-A of flatbed scanner structure chart；
Attached drawing 3：The perspective view of paper feeding scanner structure；
Attached drawing 4：The B-B direction sectional view of the perspective view of paper feeding scanner structure；
Attached drawing 5：The scanning section distribution schematic diagram of original copy when main scanning overlapping region is set（Using method one）；
Attached drawing 6：The scanning section distribution schematic diagram of original copy when main scanning overlapping region is set（Using method two）；
Attached drawing 7：The scanning section distribution schematic diagram of original copy when main scanning overlapping region is set（Using method three）；
Attached drawing 8：X-axis transmission mechanism structure chart with more probes（X-axis platform is located at upper end）；
Attached drawing 9：X-axis transmission mechanism structure chart with more probes（X-axis platform is located at lower end）；
Attached drawing 10：More probes scan the scanning block distribution schematic diagram formed when one section of original copy；
Attached drawing 11：Manuscript scanner image overlapping region is distributed when main scanning overlapping region is arranged and Y-direction compensated scanning is arranged
Schematic diagram；
Wherein：Dotted arrow in Fig. 3, Fig. 4 represents the direction of original copy movement；
Dotted arrow in Fig. 5, Fig. 6, Fig. 7 represents the track that probe 3 is moved and scanned relative to original copy；
Dotted arrow in Fig. 8, Fig. 9 represents the direction of X-axis platform reciprocating movement.
Specific implementation mode
Embodiment 1：
A kind of technical solution of the flatbed scanner of A4 breadths is disclosed in reference paper 1, scanning range is about
210mm*297mm, wherein scanning is found a view, width is about 210mm, and total optical path is about 270mm.CCD line images biography wherein can be used
Sensor（Such as the TCD2712DG CCD Linear Image Sensors of Toshiba：Valid pixel number 7500*3Line）.
By taking platform-type/flatbed scanner of A1 breadths as an example, scanning range is about 840mm*594mm, scanning accuracy
800DPI.If using existing simple scanning pattern（Scan the width 594mm that finds a view）And CCD line image sensors are used,
Then need the CCD line image sensors for being more than 594/25.4*800=18710 point using pixel number（Such as Toshiba
TCD2964BFG CCD Linear Image Sensors：Valid pixel number is 21360*6Line）；Total optical path is about 270mm*
（594mm/210mm）=764mm.Since total optical path is larger, cause the build of scanner larger, required scanning light structures
It is more complicated.It can refer to the device parameter of the LS-3800 large format A1 falt bed scanners of Microtek：Imaging sensor is coloured silk
Colo(u)r streak type CCD, scanning range are 37 inches * 24 inches (940mm*610mm), scanning accuracy 800DPI, volume 1330mm*
870mm*880mm, net weight are 172 kilograms.
Below in conjunction with attached drawing 1,2, the structure of platform-type/flatbed scanner of the present invention is introduced：
Transmission mechanism 4 includes X-axis mobile mechanism and Y-axis moving mechanism, wherein：
Y-axis moving mechanism includes that y-axis stepper motor 4ya, Y-axis lead screw 4yb, Y-axis nut 4yc, Y-axis platform 4yd, Y-axis are led
Rail 4ye, Y-axis sliding block 4yf, Y-axis support construction 4yg；Y-axis lead screw 4yb and Y-axis nut 4yc is work in coordination use, Y-axis guide rail
4ye and Y-axis sliding block 4yf is use of working in coordination；Y-axis support construction 4yg is for fixing Y-axis lead screw 4yb and Y-axis guide rail 4ye；Y
Shaft step motor 4ya is connected with Y-axis lead screw 4yb, and Y-axis platform 4yd connect and fixes with Y-axis nut 4yc and Y-axis sliding block 4yf；
It drives Y-axis lead screw 4yb to rotate when y-axis stepper motor 4ya rotations and Y-axis nut 4yc is driven to be moved back and forth along Y-axis, while driving Y
Shaft platform 4yd is moved back and forth along Y-axis；
X-axis mobile mechanism is mounted as a whole on Y-axis platform 4yd, and X-axis mobile mechanism includes X-axis stepper motor 4xa, X-axis
Lead screw 4xb, X-axis nut 4xc, X-axis platform 4xd, X-axis guide rail 4xe, X-axis slide block 4xf, X-axis support construction 4xg；X-axis lead screw 4xb
With X-axis nut 4xc be work in coordination use, X-axis guide rail 4xe and X-axis slide block 4xf it is to work in coordination use；X-axis support construction
4xg is for fixing X-axis lead screw 4xb and X-axis guide rail 4xe；X-axis stepper motor 4xa is connected with X-axis lead screw 4xb, X-axis platform 4xd
It connect and fixes with X-axis nut 4xc and X-axis slide block 4xf；X-axis lead screw 4xb rotations and band are driven when the 4xa rotations of X-axis stepper motor
Dynamic X-axis nut 4xc is moved back and forth along X-axis, while X-axis platform 4xd being driven to be moved back and forth along X-axis；
Probe 3 is mounted as a whole on X-axis platform 4xd, when X-axis mobile mechanism or Y-axis moving mechanism movement, is swept
Retouching first 3 can move back and forth with Y-direction both direction in X direction；Original copy 1 is positioned among panorama viewfinder window 5, scanning
The viewfinder range of first 3 moving range covering panorama viewfinder window 5.Since the present invention uses the technical side of combined type fractional scanning
Case, therefore the probe frame similar to existing A3 or A4 flat bed scanners described in reference paper 1 may be used in probe 3
（It is about that either 297mm total optical paths are about 270mm or 382mm to 210mm to scan width of finding a view）, compact-sized, performance stabilization.
Wherein, the difference in selling prices of the CCD line image sensors of different pixels number is very huge.Due to imaging sensor
The overall dimensions variation of imaging sensor is limited when pixel number increases, therefore the spacing of photosensitive element becomes smaller in imaging sensor,
Manufacturing cost is caused to increase.Cost can be greatly reduced after technical solution using the present invention.
After technical solution using the present invention, by taking platform-type/flatbed scanner of A1 breadths as an example, the length of scanner
It is basically unchanged with width, but thickness can be reduced to 150-200mm from existing 880mm, the weight and volume of product also greatly contracts
Subtract.Also, the size for only needing to change transmission mechanism 4 and panorama viewfinder window 5 using same structure, increases a small amount of cost i.e.
The original copy of A0 breadths or more large format can be scanned, this is that existing product cannot achieve.
Using the main transmission structure for being with stepper motor and lead screw in the present embodiment, naturally it is also possible to public using other
The drive mechanism known, such as belt pulley or gear.
Embodiment 2：
As shown in attached drawing 3,4, for paper feeding scanner, concrete structure is：
Section viewfinder window 6 is located at the side of original copy movable passageway, and paper feed mechanism 7 includes several groups idler wheel 8, respectively position
In the both sides of original copy movable passageway, a part of idler wheel 8a is set to section viewfinder window same side, before section viewfinder window
Both ends afterwards, another part idler wheel 8b are set to the opposite side of section viewfinder window, and the idler wheel 8 of original copy movable passageway both sides is mutual
It is used cooperatively, for conveying original copy 1 and for flattening original copy 1 so that 1 sequence of original copy is by section viewfinder window 6, and by scheming
As sensor 2 carries out fractional scanning successively；
Transmission mechanism 4 is located at the same side of section viewfinder window 6, including X-axis stepper motor 4xa, X-axis lead screw 4xb, X-axis
Nut 4xc, X-axis platform 4xd, X-axis guide rail 4xe, X-axis slide block 4xf, X-axis support construction 4xg；X-axis lead screw 4xb and X-axis nut
4xc is to work in coordination use, X-axis guide rail 4xe and X-axis slide block 4xf for use of working in coordination；X-axis support construction 4xg is for fixing
X-axis lead screw 4xb and X-axis guide rail 4xe；X-axis stepper motor 4xa is connected with X-axis lead screw 4xb, X-axis platform 4xd and X-axis nut
4xc is connected and is fixed with X-axis slide block 4xf；X-axis lead screw 4xb is driven to rotate and drive X-axis nut when the 4xa rotations of X-axis stepper motor
4xc is moved back and forth along X-axis, while X-axis platform 4xd being driven to be moved back and forth along X-axis；Probe 3 is mounted as a whole on X-axis platform 4xd
On, transmission mechanism 4 drives probe 3 to move back and forth in X direction, scans the original copy 1 among section viewfinder window 6
Segmented image, the viewfinder range of the moving range covering section viewfinder window 6 of probe 3.
The shortcomings that this structure is that the more difficult original copy by region to be scanned is moved from original copy if duplex scanning to be carried out
The both sides in channel flatten, therefore are more suitable for single-sweep.But for substantially Surface scan application, usually single-sweep, seldom
The large format original copy of duplex scanning in need, therefore have substantially no effect on practical application.
Further, document edge detection sensor 9 is equipped in paper feed mechanism 7, in the rear and front end of section viewfinder window 6
The first edge and trailing edge of original copy 1 are detected respectively.
For the paper feeding scanner equipped with document edge detection sensor 9, in 1 scanning process of original copy：
First, detect that original copy 1 enters by front edge detection sensor 9a；
Second, when back edge detection sensor 9b detects 1 edge of original copy, i.e. indicate original copy 1 first segment wait sweeping
It retouches section to be among section viewfinder window 6, at this time 7 pause motion of paper feed mechanism, then transmission mechanism 4 starts, drives and sweep
First 3 are retouched to be moved in X direction to the progress image scanning of the first segment of original copy 1 section to be scanned；
Third, after the completion of section scanning, paper feed mechanism 7 continues original copy 1 being fed forward a distance, waits sweeping by next
Section is retouched to be transported to the corresponding position of section viewfinder window 6 and suspend conveying and then be scanned again；And circulate operation successively；
4th, when front edge detection sensor 9a detects 1 end of original copy, 7 pause motion of paper feed mechanism, driver
Structure 4 starts, probe is driven to be moved in X direction to the progress image scanning of the latter end of original copy 1 section to be scanned；Again by paper feed mechanism
7 send out original copy 1；
Wherein, the test point of front edge detection sensor 9a and back edge detection sensor 9b may be in section
The outside of viewfinder window 6 should retreat original copy 1 on a small quantity by paper feed mechanism 7 or preceding when scanning two sections of head and the tail at this time
Into micro-adjustment.
Existing large format paper feeding scanner because limited by overall dimensions mostly use CIS contact-type image sensors,
Spliced by multiple image sensor combinations and scanned, after the scheme of the present embodiment, CCD line image sensors can be used to substitute
CIS contact-type image sensors, to obtain the better depth of field and imaging effect, equipment size is essentially identical, device fabrication at
This then declines to a great extent.
Using the drive mechanism based on stepper motor and lead screw in the present embodiment, naturally it is also possible to public using other
The drive mechanism known, such as belt pulley or gear.
Embodiment 3：
When the processing capacity of the image data processing system mating with scanner has affluence, multiple probes may be used
The scheme of 3 parallel scans：It is set up in parallel N number of probe 3 along X-direction, by each area to be scanned during fractional scanning
Section is divided into N number of block in X direction, and the moving range of each probe 3 can be covered each by corresponding block；Each probe 3
The image of respective position block is respectively moved and scanned by imaging sensor 2 therein along X-direction, then is spelled by image
Connect image data splicing synthesis complete scanning section image of the algorithm by each block.
As shown in Figure 8,9, on X-axis platform 4xd by be equidistantly set up in parallel three same specifications probe 3a,
For 3b and 3c, then section to be scanned is divided into three by three probes 3 in X direction with X-axis platform 4xd synchronizing movings
A block is scanned respectively by three probes 3, and a small amount of overlapping region is arranged in the edge of each block, is used for each block
The splicing of image.At this point, the moving range Dxn of transmission mechanism in the X-axis direction is reduced to slightly larger than viewfinder area width D x's
1/3, when hardware processing capability is enough, you can obtain about 3 times of sweep speed.As shown in Figure 10, three probe 3a, 3b,
3c scans three blocks S1, S2, S3 respectively, there is the overlapping region intersected between three blocks, is used for three block images
Splicing is merged into complete section image.
In addition to the dependency structure of probe is different, other structures are identical as embodiment 1,2 in embodiment 3.
Embodiment 4：
Since the present invention is using the scheme of combined type fractional scanning, there are the Bonding Problems of each section of image.Solution
Certainly scheme is, when carrying out fractional scanning, overlapping region to be arranged between each scanning section, passes through the image to overlapping region
The splicing that data carry out analyzing processing, realize each section of image.Specific stitching algorithm has very much, such as the side in reference paper 3
Method.
Technical scheme of the present invention can flexibly scan the original copy of different amplitudes, if in advance set the width of overlapping region
Be set to fixed value, then latter end section to be scanned therewith the overlapping region width between previous section to be scanned may with it is default
Width it is inconsistent, will produce a larger overlapping region in most cases（Hereinafter referred to as " matching difference "）, this is not
Normal use is influenced, is specifically handled using a kind of among three kinds of methods below：
Method one：Preset the width of overlapping region, between every section of scanning probe 3 relative to original copy 1 in the Y direction
On displacement distance be it is fixed, every section scanning obtain segmented image between overlapping region having the same, latter end scanning area
One section of blank image data is will produce in the image of section, is filtered out in image mosaic；
Method two：Preset the width of overlapping region, between every section of scanning probe 3 relative to original copy 1 in the Y direction
On displacement distance be overlay region having the same between the segmented image that every section of scanning obtains except the scanning of fixed, latter end
Domain detects whether original copy arrived end first before scanning latter end scanning section, will when detecting that original copy arrived end
Transmission mechanism 4 or 7 stop motion of paper feed mechanism are simultaneously scanned, the image and the last period scanning area of the section of latter end scanning at this time
The overlapping region width of section may be inconsistent with preset width, filters out duplicate data in image mosaic；
Method three：When the length of original copy to be scanned is known in advance, sector number is scanned according to original copy length computation and is treated
It scans section and carries out decile, the overlapping region between each section is consistent, and probe 3 is relative to original copy 1 between every section of scanning
Displacement distance in the Y direction is fixed, need not do specially treated to latter end scanning section when stitching image（This decile
Method can improve the accuracy of image mosaic to greatest extent）.
Such as original copy length is 940mm, image sensor scan finds a view width as 210mm, then needs original copy being divided into 5 sections
（P1,P2,P3,P4,P5）It is scanned, there are 4 overlapping intervals at this time；It is carried out respectively to pressing above-mentioned three kinds of methods as example
The process of processing illustrates：
Method one：As shown in Fig. 5, it is 10mm to preset overlapping region width, and probe 3 is opposite between every section of scanning
In the displacement distance in the Y direction of original copy 1 be 200mm, each section scanning section image between overlapping region equivalent width
For 10mm；Scan image total length is 1030mm, and there are the clear data of 70mm, images at the end of the image of latter end scanning section
Specially treated must be done to this when splicing to be filtered out；
Method two：As shown in Fig. 6, it is 10mm to preset overlapping region width, and probe 3 is opposite between every section of scanning
It is 200mm in the displacement distance in the Y direction of original copy 1, when scanning latter end scanning section, probe 3 is relative to original copy 1
Displacement distance in the Y direction is 130mm, and scan image total length is 940mm, and the image of latter end scanning section is swept with the last period
The overlapping region width for retouching section image is 80mm, and when image mosaic must do this specially treated and be filtered out；
Method three：As shown in Fig. 7, as predicted the length of scan manuscript as 940mm, the width of overlapping interval is calculated first
Degree, as（210mm*5-940mm）/ 4=27.5mm, shifting in the Y direction of the probe 3 relative to original copy 1 between every section of scanning
Dynamic distance is to take 182.5mm, and the overlapping region equivalent width between the image of each section of scanning section is 27.5mm, and scan image is total
Length is 940mm, and when stitching image need not do specially treated to latter end scanning section.
In conclusion when scanning section sum is less, matching difference has a certain impact to sweep speed, but each simultaneously
Overlapping region between section scanning also tends to become larger, and is conducive to the accurate splicing of each section image；And when original copy length it is bigger,
When scanning section sum increases, influence of the matching difference to sweep speed becomes smaller.
Method is still unidirectional overlapping backoff algorithm similar with the prior art used by above, still, of the invention
In technical solution, overlapping region to be spliced together and is needed in the prior art by made of the same image sensor scan
The overlapping region to be spliced is made of different image sensor scans；Therefore problem of the existing technology is different
Between imaging sensor and mating optical structure there are individual difference, influence joining quality, and technical side using the present invention
Case is then substantially not present the problem of consistency.Therefore, image mosaic scheme of the invention is better than the prior art.
However, unidirectionally still there is certain defect in overlapping backoff algorithm：
1, as described in the background technology of reference paper 2, " small ripple or bending in scanning sample or in scanning sample
Product cause the visible image mistake in the transitional region of image sensor semiconductor device, these images wrong by the minor fluctuations in speed
Accidentally such as being shown as interrupt line or eccentric line, two-wire "；
2, when validity feature data are less in the part of overlapping region for original copy（Such as overlapping region is by chance no image
The white space of data or lines etc. for no significant difference feature）, the accuracy of splicing will be affected.
More accurate two-way overlapping backoff algorithm may be used in characteristic based on technical solution of the present invention, corresponding specific
Structure is：
The one or more small-sized auxiliary image sensors 10 of setting in X direction, between being scanned at every section, probe 3 it is opposite
In original copy 1 along Y-direction generate relative movement when, start small-sized auxiliary image sensor 10 acquire Y-direction manuscript image data,
That is Y-direction compensated scanning, and reference frame when splicing as complete image, concrete structure are divided into two kinds：
First, platform-type/flatbed scanner：Small-sized auxiliary image sensor 10 is fixed on the X-axis platform of transmission mechanism 4
On 4xd（As shown in Figure 1, 2, two small-sized auxiliary image sensors 10 are set）；
Second, paper feeding scanner：Small-sized auxiliary image sensor 10 is fixed on the front end or rear end of section viewfinder window 6
（As shown in Figure 3,4, two small-sized auxiliary image sensors 10 are set）.
Since the period of Y-direction compensated scanning is in the interim of each section scanning, main scanning is not interfered with
Efficiency；And the scanning of small-sized auxiliary image sensor 10 find a view width only need 5-20mm can, at low cost and data volume
It is smaller.
For the scanner equipped with small-sized auxiliary image sensor 10, by Y-direction compensated scanning, Manuscript scanner image is original
Cross one another shape is presented in the overlapping region of data（As shown in figure 11）；In stitching image, it is scanned with each section first
Between X to overlapping region be then to be made again with the Y-direction overlapping region that small-sized auxiliary image sensor 10 acquires according to being spliced
For verification, it is finally completed the splicing of complete image.
By above method, the fluctuation of local image easier can be positioned and be corrected；And original copy is two sides
The probability for the phenomenon that generating " validity feature data are less " simultaneously upwards is very low, therefore two-way overlapping backoff algorithm improves
The quality of image mosaic and accuracy.
Certainly, the invention is not limited to the above embodiment, and those skilled in the art are without prejudice to originally
Equivalent variations or replacement can be also made under the premise of spirit, these equivalent modifications or replacement are all contained in the application right
It is required that in limited range.
Claims (4)
1. the scan method of large format scanner, it is characterised in that：In scanning process, the scanning of image taking sensor (2) is found a view
Original copy (1) is divided into multiple scanning sections along Y-direction on the basis of width and carries out fractional scanning：
First, probe (3) is aligned to the first segment section to be scanned of original copy, drives probe (3) along X by transmission mechanism (4)
Direction movement carries out image scanning to the first segment of original copy section to be scanned；
After the completion of the scanning of the first segment of original copy section to be scanned, probe (3) is driven to be moved along Y-direction by transmission mechanism (4)
It moves or moves original copy (1) along Y-direction by paper feed mechanism (7) so that the second segment that probe (3) is directed at original copy (1) is to be scanned
Section；
Driving probe (3) by transmission mechanism (4) again, movement carries out figure to the second segment region to be scanned of original copy (1) in X direction
As scanning；
Then, scanning of the cycle up to completion to whole picture original copy (1) according to this；
Wherein：
For platform-type/flatbed scanner：Original copy is positioned in panorama viewfinder window (5), probe (3) is past in X direction
Fractional scanning original image is moved again, drives probe to be moved along Y-direction by transmission mechanism (4) between every section of scanning so as to sweep
Head (3) is retouched to be directed at next section to be scanned and then be scanned again；And cycle completes scanning process successively；
For paper feeding scanner：The first segment section to be scanned of original copy (1) is transported to area along Y-direction by paper feed mechanism (7)
The corresponding position of section viewfinder window (6) simultaneously suspends conveying；Probe (3) motion scan first segment section to be scanned in X direction
Original image continues conveying original copy (1) by paper feed mechanism (7) between every section of scanning along Y-direction, and next section to be scanned is defeated
It is sent to the corresponding position of section viewfinder window (6) and suspends conveying and then be scanned again；Successively cycle complete scanning process,
Original copy (1) is sent out by paper feed mechanism (7) again.
2. the scan method of large format scanner according to claim 1, it is characterised in that：For being equipped with document edge inspection
The paper feeding scanner for surveying sensor (9), in original copy (1) scanning process：
First, detect that original copy (1) enters by front edge detection sensor (9a)；
Second, when back edge detection sensor (9b) detects original copy (1) edge, i.e. indicate original copy (1) first segment wait for
Scanning section has been among section viewfinder window (6), at this time paper feed mechanism (7) pause motion, and then transmission mechanism (4) opens
Dynamic, drive probe (3) moves in X direction carries out image scanning to the first segment of original copy (1) section to be scanned；
Third, after the completion of section scanning, paper feed mechanism (7) continues original copy (1) being fed forward a distance, waits sweeping by next
Section is retouched to be transported to the corresponding position of section viewfinder window (6) and suspend conveying and then be scanned again；And cycle is grasped successively
Make；
4th, when front edge detection sensor (9a) detects original copy (1) end, paper feed mechanism (7) pause motion, transmission
Mechanism (4) starts, probe is driven to be moved in X direction to the progress image scanning of the latter end of original copy (1) section to be scanned；Again by presenting
Mechanism of paper (7) sends out original copy (1).
3. the scan method of large format scanner according to claim 1, it is characterised in that：When carrying out fractional scanning,
Overlapping region is set between each scanning section, analyzing processing is carried out by the image data to overlapping region, realizes each section
The splicing of image is specifically handled using a kind of among three kinds of methods below：
Method one：Preset the width of overlapping region, between every section of scanning probe (3) relative to original copy (1) in the Y direction
On displacement distance be it is fixed, every section scanning obtain segmented image between overlapping region having the same, latter end scanning area
One section of blank image data is will produce in the image of section, is filtered out in image mosaic；
Method two：Preset the width of overlapping region, between every section of scanning probe (3) relative to original copy (1) in the Y direction
On displacement distance be overlay region having the same between the segmented image that every section of scanning obtains except the scanning of fixed, latter end
Domain detects whether original copy arrived end first before scanning latter end scanning section, will when detecting that original copy arrived end
Transmission mechanism (4) or paper feed mechanism (7) stop motion are simultaneously scanned, and the image of the section of latter end scanning at this time is swept with the last period
The overlapping region width for retouching section may be inconsistent with preset width, filters out duplicate data in image mosaic；
Method three：When the length of original copy to be scanned is known in advance, sector number is scanned according to original copy length computation and to be scanned
Section carries out decile, and the overlapping region between each section is consistent, and probe (3) is relative to original copy (1) between every section of scanning
Displacement distance in the Y direction is fixed, need not do specially treated to latter end scanning section when stitching image.
4. the scan method of large format scanner according to claim 1, it is characterised in that：For being equipped with small-sized auxiliary figure
As the scanner of sensor (10), pass through Y-direction compensated scanning so that phase is presented in the overlapping region of Manuscript scanner original image data
The shape mutually intersected；In stitching image, spliced first to overlapping region for foundation with the X between each section scans, so
Afterwards the splicing of complete image is finally completed using the Y-direction overlapping region that small-sized auxiliary image sensor (10) acquires as verification again.
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| CN110248042A (en) * | 2018-03-08 | 2019-09-17 | 精工爱普生株式会社 | The generation method of image read-out and image data |
| US10556764B2 (en) * | 2018-03-22 | 2020-02-11 | Kyocera Document Solutions Inc. | Sensor unit and image forming apparatus therewith |
| CN110412054B (en) * | 2018-04-28 | 2024-04-30 | 苏州玻色智能科技有限公司 | Glass panel detection equipment and detection image splicing method |
| CN109817541B (en) * | 2019-01-31 | 2020-05-12 | 上海精测半导体技术有限公司 | Scanning method, control device, detection unit and production system |
| CN110099203B (en) * | 2019-05-14 | 2021-02-19 | 苏州经贸职业技术学院 | Fold bill information acquisition device and acquisition method |
| CN110991451B (en) * | 2019-11-01 | 2024-05-07 | 珠海奔图电子有限公司 | Correction method and device for card area image of scanned image |
| CN111314571A (en) * | 2020-01-21 | 2020-06-19 | 许之敏 | Scanning imaging method, computer equipment and storage medium |
| CN111131653A (en) * | 2020-01-21 | 2020-05-08 | 西安海慧电子智能科技有限公司 | Super-large-format high-resolution scanning method and related platform type scanner |
| CN112325080A (en) * | 2020-11-16 | 2021-02-05 | 奥士康科技股份有限公司 | Automatic marking method for MI drawing |
| CN113890954B (en) * | 2021-09-30 | 2022-06-21 | 盐城思途云智能科技有限公司 | Internal scanning mechanism of full-automatic image scanning analysis equipment |
| CN114173018B (en) * | 2021-12-22 | 2024-03-19 | 北京华夏视科技术股份有限公司 | Scanning device light path system |
| CN115086502B (en) * | 2022-06-06 | 2023-07-18 | 中亿启航数码科技(北京)有限公司 | Non-contact scanning device |
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