CN100527775C - An image scanning method and system - Google Patents
An image scanning method and system Download PDFInfo
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- CN100527775C CN100527775C CNB2007100734486A CN200710073448A CN100527775C CN 100527775 C CN100527775 C CN 100527775C CN B2007100734486 A CNB2007100734486 A CN B2007100734486A CN 200710073448 A CN200710073448 A CN 200710073448A CN 100527775 C CN100527775 C CN 100527775C
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Abstract
The related image scanning system in automatic control field comprises: a scanner with a paper-feeding device for the scanning media and an image collection device for synchronous scanning, and a connected master computer contained a data process unit for collected data. Wherein, the image collection device comprises more than one set of the combination of lens and image sensor. this invention improves scanning resolution and precision for better quality.
Description
Technical field
The present invention relates to scanner and computer autocontrol technique field, more particularly, relate to a kind of image scan method and system.
Background technology
Scanner is the input equipment that is widely used in computer except that keyboard and mouse.
Existing scanning system comprises scanner and coupled main control computer, when the scanned medium that will be printed on file content (as scanned medium) is anti-when being affixed on the platform glass plate of scanner, scanner scans it, and send the picture signal of gained to main control computer, by main control computer this picture signal is carried out data processing and drawn out scan image.
Scanner comprises mechanical driving device, optical imaging device and photoelectric conversion device, wherein: (1) mechanical driving device is made of stepping motor, driving belt, rail plate and gear train, stepping motor is by driving belt, and then driven sweep head, slide on slide bar, realization is lined by line scan to image, and perhaps probe is fixed, and take form feeding device, in form feeding device feeding scanned medium, scan; (2) probe that promptly is commonly called as of optical imaging device, form by fluorescent tube, reflective mirror, camera lens, CCD, prior art has adopted two area array CCD digital cameras, obtains the light signal of image from the scanned medium that is affixed on the platform glass plate, and is converted into analog picture signal; (3) photoelectric conversion device is a printed circuit board (PCB) that is placed in scanner inside, various electronic components are arranged on it, comprise A/D converter, BIOS chip, I/O control chip and high-speed cache (Cache), it is the control system of scanner, in the scanner scanning process, mainly finishing the input of ccd signal handles, analog picture signal is converted to data image signal, and stepping motor is controlled.Main control computer carries out basic correction to it and gets final product after receiving the data image signal that scanner uploads, and comprises skew control and at the uniform velocity proofreaies and correct etc., and draw out scan image according to the data after proofreading and correct.
In above-mentioned prior art, scanner utilizes two area array CCD digital cameras, and each is taken once, image is stitched together again, and this way requires CCD sensitive chip size bigger, but scanning resolution is not high, so quality of scanning is on the low side; And the optical imaging device of paper feeding scanner is CIS (Contact ImageSensor), and CIS adopts Chip on Board, and difficulty of processing is big.
Therefore the method that needs a kind of new image scanning to be improving quality of scanning, and simplifies production technology, reduces cost.
Summary of the invention
The object of the present invention is to provide a kind of image scanning system, be intended to solve the low problem of quality of scanning that exists when prior art is carried out image scanning.
The present invention also aims to provide a kind of image scan method, to solve the above-mentioned problems in the prior art better.
In order to realize goal of the invention, described image scanning system comprises scanner and coupled main control computer, described scanner comprises image collecting device, described main control computer comprises data processing unit, described scanner also comprises a form feeding device, also comprises a splicing correction module in the data processing unit of described main control computer;
Form feeding device in the described scanner adopts mechanical drive mode feeding scanned medium, and described image collecting device then scans the scanned medium of feeding simultaneously;
The data processing unit of described main control computer further utilizes described splicing correction module to splice treatment for correcting, and draws out scan image according to result after the picture signal that described image collecting device is collected is carried out basic correction.
Preferably, the image collecting device of described scanner comprises many set of shots and imageing sensor, is used for parallel acquisition multiple series of images signal in described form feeding device feeding scanned medium, and is uploaded to main control computer simultaneously and carries out data processing.
Preferably, described imageing sensor is the integrated circuit sensitive chip of face battle array or linear array, comprises CMOS or CCD photodiode, and peripheral circuit.
Preferably, described form feeding device comprises Drive Structure and at least one group of coupled relative up and down roller bearing;
Described one group of relative up and down roller bearing comprises initiatively a roller bearing and a supplementary rder, and both fit to clamp scanned medium;
Described Drive Structure comprises stepper motor and coupled worm screw and gear, and described stepper motor passes through worm screw, the described active roller bearing of gear driven, and further drives supplementary rder feeding scanned medium.
Preferably, described form feeding device comprises two groups of relative up and down roller bearings, and with its first Drive Structure that links to each other respectively, second Drive Structure;
Described two groups of relative up and down roller bearings comprise first initiatively roller bearing, with first roller bearing first supplementary rder of fitting initiatively, and second initiatively roller bearing, with second roller bearing second supplementary rder of fitting initiatively;
Described first Drive Structure comprises stepper motor and coupled worm screw and gear, and described stepper motor passes through initiatively roller bearing of worm screw, gear driven first, and further drives the first supplementary rder feeding scanned medium;
Described second Drive Structure comprises preceding belt wheel, belt that links to each other with the first active roller bearing and the back belt wheel that links to each other with the second active roller bearing, when first Drive Structure is moved, belt wheel, belt and back belt wheel before the described first active roller bearing drives, thereby drive the second active roller bearing, and the second supplementary rder feeding scanned medium of the further drive and the second active roller bearing applying.
In order to realize goal of the invention better, the system that described image scan method is formed based on scanner and coupled main control computer said method comprising the steps of:
A. described scanner is the parallel light signal that obtains the scanned medium of the described feeding of many groups in the feeding scanned medium;
B. described scanner is converted to data image signal with the many groups light signal that is obtained, and is uploaded to main control computer simultaneously;
C. after main control computer is received the data image signal that scanner uploads, it is carried out basic correction, comprise skew control and at the uniform velocity proofread and correct;
D. further utilize the sensor bias parameter that described data image signal is spliced correction, described sensor bias parameter obtains by proofreading and correct paper, comprise imageing sensor inclination angle, row deviation, row deviation and paper feed step-length, described splicing is proofreaied and correct and is comprised slant correction, ranks offset correction and overlapping correction;
E. draw out scan image according to the data processed result of abovementioned steps C and D.
Preferably, proofreading and correct paper among the described step C is black and white two looks, and wherein the outside is a white, and black part is divided into isosceles right triangle, and two right-angle side is parallel to the both sides of proofreading and correct paper respectively.
Preferably, described correction paper only uses black and white two looks: top is chequered with black and white nicking, the width alternation reversed in order of black streaking and informal voucher line from left to right, and in the heart distance remains unchanged in adjacent two black streakings; The right-angled triangle that the bottom is arranged side by side, the angle of triangle base length and wedge angle preestablishes.
Preferably, described step D carries out data image signal in the process of slant correction and ranks offset correction, utilize in the following formula computed image (i, j) coordinate of picture element corresponding sampling points (x ', y '):
Wherein 8. be the inclination angle of imageing sensor, r, c are respectively the capable deviation and the row deviation of imageing sensor, and s is the paper feed step-length, n be meant (i, j) picture element is scanned by sensitive chip when the n time paper feed;
And utilize in the following formula computed image (i, j) the gray value g of picture element (i, j):
Wherein u, v are respectively the maximum integer that is no more than x ' and y ', and (u v) is (u, v) an element of the gray value array obtained of sensitive chip to f.
Preferably, described step D comprises the process that data image signal carries out overlapping correction: the distance according to overlapping point and superposition boundary is determined weights.
Scanner of the present invention is by form feeding device feeding scanned medium, and utilize many set of shots and imageing sensor in the image collecting device in the feeding scanned medium, repeatedly to scan, again the view data that scans is uploaded to and carry out data processing in the main control computer, thereby improved scanning resolution and precision, obtained higher quality of scanning.
Description of drawings
Fig. 1 is the structure chart of image scanning system among the present invention;
Fig. 2 is the schematic diagram that scanner scans in the feeding scanned medium in one embodiment of the present of invention;
Fig. 3 is the cut-away view of scanner among the embodiment among the present invention;
Fig. 4 is the image collecting device work principle figure of scanner in one embodiment of the present of invention;
Fig. 5 is the cut-away view of the data processing unit of main control computer in one embodiment of the present of invention;
Fig. 6 is the schematic diagram that the data processing unit utilization splicing correction module of main control computer in one embodiment of the present of invention carries out the image splicing;
Fig. 7 is imageing sensor inclination in one embodiment of the present of invention, deviation, overlapping schematic diagram;
Fig. 8 is the isoparametric coordinate schematic diagram in capable deviation, row deviation, inclination angle of imageing sensor among the present invention;
Fig. 9 A, 9B are the correction paper schematic diagrames that carries out the sensor bias parametric measurement in one embodiment of the present of invention;
Figure 10 is the method flow diagram of image scanning among the present invention;
Figure 11 is the method flow diagram of image scanning in one embodiment of the present of invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Scanner among the present invention comprises form feeding device and image collecting device, by form feeding device feeding scanned medium, and utilize image collecting device in the feeding scanned medium, repeatedly to scan, again the view data that scans is uploaded to and carry out data processing in the main control computer, comprise basic correction and splicing correction etc., thereby improved scanning resolution and precision, effectively avoided image fault, obtained higher quality of scanning.
Fig. 1 shows the structure of image scanning system among the present invention, and this system comprises scanner 10 and main control computer 20.
(1) form feeding device 11 utilizes mechanical transmission structure feeding scanned medium, and the alleged scanned medium of the present invention comprises the medium that all can scan, and is typical in paper.In one embodiment, this form feeding device 11 can be made of stepper motor, worm screw, gear and roller bearing.
(2) 12 of image collecting devices scan in form feeding device 11 feeding scanned mediums, and the light signal that obtains is carried out opto-electronic conversion and analog-to-digital conversion, thereby obtain data image signal, and are sent to and carry out data processing in the main control computer 20.
(1) data transmit-receive unit 21 receives the data image signal that scanner 10 is uploaded, and it is sent in the data processing unit 22.
(2) data image signal that receives of 22 pairs of data Transmit-Receive Units 21 of data processing unit carries out data processing, comprise basic correction and splicing correction in the present invention, this basic correction comprises skew control, at the uniform velocity proofreaies and correct etc., and splicing is proofreaied and correct and then comprised slant correction, ranks offset correction and overlapping correction etc.
Fig. 2 is the schematic diagram that scanner 10 scans in feeding scanned medium 41 in one embodiment of the present of invention, and Fig. 3 then is the cut-away view of scanner 10 among this embodiment.Should be noted that this embodiment is not the simplest embodiment of the present invention, but a most preferred embodiment.
The core of this scanner 10 comprises form feeding device 11 and image collecting device 12, wherein:
(1) in this embodiment, comprise two groups of relative up and down roller bearings in the form feeding device 11 of scanner 10, and with its first Drive Structure that links to each other respectively, second Drive Structure.These two groups of relative up and down roller bearings, promptly first initiatively roller bearing 1104, with first initiatively roller bearing 1,104 first supplementary rder 1111, second of fitting initiatively roller bearing 1105, with second roller bearing 1,105 second supplementary rder 1112 of fitting initiatively.
First Drive Structure comprises stepper motor 1101 and coupled worm screw 1102 and gear 1103, this stepper motor 1101 drives the first active roller bearing 1104 by worm screw 1102, gear 1103, and further drives first supplementary rder, 1111 feeding scanned mediums 41;
Second Drive Structure comprises preceding belt wheel 1106, belt 1107 that links to each other with the first active roller bearing 1104 and the back belt wheel 1108 that links to each other with the second active roller bearing 1105, when first Drive Structure is moved, belt wheel 1106, belt 1107 and back belt wheel 1108 before the first active roller bearing 1104 drives, thereby drive the second active roller bearing 1105, and second supplementary rder, the 1112 feeding scanned mediums 41 of further drive and 1105 applyings of the second active roller bearing.
(2) image collecting device 12 comprises camera lens 1201,1202 and imageing sensor 1203,1204.
In the present embodiment, the principle that camera lens 1201,1202 obtains picture signal as shown in Figure 4: scanned medium 41 is sizes of A6 among this embodiment, promptly 105 * 148 millimeters.Two camera lenses 1201,1202 obtain the image of respective width separately.F is the focal length of camera lens 1201,1202, and w is the target surface width of imageing sensor 1203,1204, and W is the width that can realize scanned medium 41, and L is the distance of scanned medium 41 to camera lens 1201,1202.According to optical principle, following mathematical relationship: f=wL/W is arranged.
If camera lens 1201,1202 is standard lens, then f=3.5mm; Imageing sensor 1203,1204 is 1/3 inch, and its target surface is of a size of 4.8mm * 3.6mm, diagonal 6mm; Each width that need scan is 55mm in two imageing sensors 1203,1204.Then: L=fW/w=3.5 * 55/4.8=40.1mm.Should be noted that above-mentioned parameter is a kind of preferred design of the present invention, and be not limited to this.
In one embodiment of the invention, imageing sensor the 1203, the 1204th, the integrated circuit sensitive chip of face battle array or linear array, comprise complementary metal oxide semiconductors (CMOS) (Complementary Metal OxideSemiconductor, CMOS) or charge coupled device (Charge Coupled Device, CCD) photodiode, and peripheral circuit.
Fig. 5 is the cut-away view of the data processing unit 22 of main control computer 20 in one embodiment of the present of invention.
The data image signal that this data processing unit 22 is used for scanner 10 is uploaded carries out various data processing, and utilizes result to draw out scan image, and it comprises basic correction module 221, splicing correction module 222 and image drafting module 223, wherein:
(1) basic correction module 221 data image signal that is used for scanner 10 is uploaded carries out basic correction, comprises skew control, at the uniform velocity proofreaies and correct etc., is some correction means commonly used in the prior art.After executing basic correction, then data image signal is sent in the splicing correction module 222 and further handled.
(2) splicing correction module 222 links to each other with basic correction module 221, be used for splicing correction through the data image signal after the basic correction, comprise slant correction, ranks offset correction, overlapping correction etc., concrete trimming process will elaborate thereafter.Splice correction module 222 and finish after splicing and whole the correction, then the result data are sent into image drafting module 223 and carried out the image drafting.
(3) after image drafting module 223 receives the result data of splicing correction module 222 transmissions, then utilize it to draw out scan image.
Fig. 6 is the schematic diagram that the data processing unit 22 of main control computer 20 in one embodiment of the present of invention utilizes splicing correction module 222 to carry out the image splicing.
Because scanner 10 of the present invention is spliced by several two-dimensional image sensor arrays or one dimension imageing sensor, each transducer obtains scanned a part of image, and the image that utilizes splicing correction modules 222 that each transducer is obtained by the data processing unit 22 of main control computer 20 is spliced into a width of cloth general image again.In one embodiment, each imageing sensor size is consistent, but the present invention is not limited thereto.
If itself there is crooked or distortion in imageing sensor 1023,1024, perhaps chart drive speed be not strictness at the uniform velocity, the deviation that then causes is thus proofreaied and correct by the basic correction module 221 of data processing unit 22, and other deviations are then handled by splicing correction module 222.
Fig. 6 is specified as follows based on embodiment shown in Figure 4:
(1) imageing sensor 1023,1024 can be two-dimentional, also can be one dimension, also, and imageing sensor the 1023, the 1024th, linear transducer, or rectangular sensor.In an exemplary embodiments, imageing sensor 1023,1024 adopts rectangular sensor, and each scanning all obtains the picture signal of a face, rather than lines by line scan, therefore compare with the progressive scan mode of imageing sensor in the prior art, have higher scan efficiency.
(2) scanned actual image information can be regarded as continuous two-dimensional function, the data that imageing sensor 1023,1024 obtains then are some the discrete sampling information on the integer picture element, and therefore requiring the sampled point of imageing sensor 1023,1024 inside must be equally distributed on material object.The resolution that also requires imageing sensor 1023,1024 sampling in addition is strict identical, and promptly imageing sensor 1023 is identical with 1024 sampling numbers in unit are.
(3) may there be certain lap between the image that imageing sensor 1023,1024 obtains, perhaps the image of twice scanning forms certain overlapping, perhaps each imageing sensor 1203,1204 is not strict on same straight line, perhaps there is little angle of inclination, perhaps there is ranks deviation etc., as shown in Figure 7, be imageing sensor 1023 and 1024 at a time and the paper feed image inclination, overlapping, the row deviation schematic diagram that obtain after once, above situation is detected and is proofreaied and correct by splicing correction module 222.
Processing method is:
(1) at first uses pre-set correction paper scanning, obtain data such as inclination angle, lap position, row deviation size by dedicated algorithms.
(2) after getting access to these data, splicing correction module 222 just can calculate final digital picture by scan-data.
Fig. 8 is the isoparametric coordinate schematic diagram in capable deviation, row deviation, inclination angle of imageing sensor among the present invention.It is the origin of coordinates that the digital picture that the present invention obtained is got the lower left corner, and is to scan from the bottom up when establishing scanner 10 scanning.
If have three imageing sensors to scan simultaneously in one embodiment, then set up scanning coordinate in such a way: is initial point with first imageing sensor in the lower left corner of preliminary sweep moment sampled data, with this imageing sensor with respect to the moving direction of scanning thing be Y-axis set up real-world coordinate system (X, Y); The lower left corner with each sensor sample data is initial point, and length and Width are respectively X ' axle and Y ' axle and set up sensor coordinate system (X ', Y ') and coordinate system (X ＂, Y ＂).
Wherein, the angle between the X-axis of the X ' of sensor coordinate system axle and real-world coordinate system is called the inclination angle of this transducer; The capable deviation that is called this transducer at the initial point of scanning initial time sensor coordinate system with respect to the Y coordinate of real-world coordinate system, this X coordinate with respect to real-world coordinate system is called the row deviation of this transducer, according to this definition, the capable deviation and the row deviation of first imageing sensor are 0; The height of the image array that imageing sensor obtains and width are called the height and the width of this imageing sensor; Imageing sensor of paper feed is called step-length with respect to scanned actual displacement along Y direction.Among the present invention, the inclination angle of each imageing sensor, row deviation, row deviation are normally different, and it is different that height allows with width, but once mobile each transducer of distance (being step-length) of paper feed is identical.
Among the present invention, imageing sensor inclination angle note is made θ, row deviation note is made r, and row deviation note is made c, and imageing sensor height note is made h, and imageing sensor width note is made w, and the moving step length note of an imageing sensor of paper feed is made s.
If the view data that certain imageing sensor obtains at the n time paper feed is f (x ', y ').Coloured image can be decomposed into the monochrome image of three kinds of colors of RGB, can establish f (x ', y ') and be the monochromatic sampled data that obtains in (x ', y ') coordinate points.
The general thought of merging algorithm for images is: correspond to which coordinate points on scanned according to each element in each straggling parameter computed image sensor sample data (two-dimensional array), promptly obtain the scanned data that go up series of points; Utilize interpolation method to obtain data on the integer pixel lattice point again, thereby obtain entire image by the data of these sampled points.
(1) process of slant correction is as follows:
Set up coordinate system (X ＂, Y ＂) as Fig. 6, then any point on the plane had:
Promptly a bit (x ', the y ') coordinate in (X ＂, Y ＂) coordinate system in (X ', Y ') coordinate system is
Image behind the note slant correction is f
1(x ＂, y ＂) then has:
(2) process of ranks offset correction is as follows:
The distance of Y-axis of the initial point of sensor coordinates and real-world coordinate system remains unchanged during paper feed, increases s with the each paper feed of the distance of X-axis, thus behind n paper feed the coordinate of initial point in real-world coordinate is of sensor coordinate system be (c, n*s+r).Thereby any point on the plane is had:
The document object image be g (x y), then has:
(2) formula substitution (4) formula is had:
The implication of following formula is: transducer 2 the n time paper feed collect in the view data of (x ', y ') point corresponding on the material object
The view data of point.
More than derive and all under real arithmetic, carry out, in actual applications (x ', y ') being is the integer value of unit with the pixel, and output image data also must be in real-world coordinate system to be sampled data on the integer value of unit with the pixel, need adjust formula.Order:
Can obtain material picture (x, color information y), but the requirement of final output image is the color information on some integer picture elements from the view data of second imageing sensor according to above derivation.Simply can be with (x y) is rounded up on the immediate integer lattice.Meticulous algorithm can be according to (x on four integer lattice around y) position in integer grid is assigned to by certain weight, for example can adopt linear interpolation or high-order interpolation algorithm.
The present invention is according to the realistic object image of sampled data (i, color data j).By formula (6), material picture (i, j) coordinate of some corresponding sampling points is:
Promptly
Might as well suppose that (i j) drops in the sample area of the n time paper feed of the 2nd transducer.Be respectively u, v if be no more than the maximum integer of x ' and y '.Then linear interpolation method can be according to (x ', y ') four integer lattice on every side
On the color information interpolation obtain (x ', y '), interpolation formula is:
(3) process of overlapping correction is as follows:
May there be two kinds of doublings of the image under the situation in the present invention: same imageing sensor exists overlapping between the scan image that twice paper feed obtains, and exists overlapping between the scan image that obtains with different imageing sensor of paper feed.
Can adopt two imageing sensors to obtain the weighted average of data to overlapping partial data.
Simple as, directly cover the data (weights that promptly are equivalent to first imageing sensor are 0) of first imageing sensor with the data of second imageing sensor, the method does not just need the processing of special overlapping detection.
Comparatively complicated algorithm can be determined weights according to the distance of overlapping point and superposition boundary, thereby reduces because of the different jumps that cause view data at the splicing boundary place of hardware performance.
Parameters such as aforesaid imageing sensor inclination angle, row deviation, row deviation and paper feed step-length need to measure in advance, and method of measurement is to use the set correction paper of scanner 10 scannings, calculates according to the data cases that test is read.The height of imageing sensor, width are the line number and the columns of the two-dimensional array that obtains of imageing sensor, and be given by hardware designs or other software modules.
Proofread and correct the design of paper and should consider to obtain as far as possible accurately these deviation datas, multiple design can be arranged.
Fig. 9 A shows the design of proofreading and correct paper in one embodiment of the present of invention, and particular content is as follows:
(1) proofreading and correct paper and only use black and white two looks, is a black isosceles right triangle in the shadow region, and the outside is a white, and two right-angle sides of this black isosceles right triangle are parallel to the both sides of proofreading and correct paper respectively.
When (2) paper feed scans the triangle base, can record the capable deviation of transducer.
When (3) paper feed scans the triangle hypotenuse, can record each transducer inclination angle, and by the row deviation calculation deviation of falling out.
When (4) adjacent twice paper feed scans hypotenuse, can be regarded as out the paper feed step-length.
Fig. 9 B shows the design of proofreading and correct paper in another embodiment of the present invention, and details are as follows for its main points:
(1) proofread and correct paper and only use black and white two looks: top is chequered with black and white nicking, and black streaking broadens gradually from left to right, and the informal voucher line narrows down gradually, and its gradual change order also can be changed certainly.In the heart distance remains unchanged in adjacent two black streakings; The right-angled triangle that the bottom is arranged side by side, the angle of triangle base length and wedge angle is given in advance.
(2) in the bottom of proofreading and correct paper, if the sensitive chip inclination angle is 0, then scan line is a level, and the length of the length of black line segment and white line section all remains unchanged on the scan line.According to situation of change black on the scan line, the white line segment length, can try to achieve the inclination angle of sensitive chip.
(3) in the bottom of proofreading and correct paper, if the capable deviation of two sensitive chips is 0, then pass through the inclination conversion after, the scan line of two sensitive chips black, the white line segment length is equal respectively.The situation of, white line segment length black according to two scan lines can be tried to achieve the capable deviation of sensitive chip.
(4) in the bottom of proofreading and correct paper, the length situation of, white line section black according to adjacent twice paper feed scan line can be tried to achieve the paper feed step-length.
(5) on the top of proofreading and correct paper, because each width black, the informal voucher line is known in advance,, can try to achieve the row deviation of sensitive chip according to length black on the scan line, the white line section, so far all deviation data all obtains.
In addition, if known scanner is spliced by two sensitive chips, then proofreading and correct the paper bottom, can pass the row deviation that leg-of-mutton number is tried to achieve sensitive chip according to two scan lines, proofreading and correct paper so only needs the latter half to get final product.
Should be noted that the present invention measures the employed correction paper of imageing sensor straggling parameter, is not limited to the scheme shown in above-mentioned Fig. 9 A, the 9B.
Figure 10 shows the method flow of image scanning among the present invention, and this method flow is based on system configuration shown in Figure 1, and detailed process is as follows:
In step S1001, scanner 10 scans scanned medium 41 in paper feed, obtains picture signal and is uploaded to main control computer 20.Its detailed process comprises: (1) scanner 10 utilizes form feeding device 11 feeding scanned mediums 41 (as paper), and utilizes image collecting device 12 to obtain the light signal of image from scanned medium 41 simultaneously; (2) 12 pairs of these light signals of image collecting device carry out opto-electronic conversion and analog-to-digital conversion, thereby obtain data image signal; (3) this data image signal is uploaded to main control computer 20.
In step S1002, main control computer 20 carries out data processing to it, and draws out scan image according to result after receiving the data image signal that scanner 10 uploads.Detailed process comprises: after (1) main control computer 20 utilizes data transmit-receive unit 21 to receive the data image signal that scanner 10 uploads, at first utilize the basic correction module 221 in the data processing unit 22 that it is carried out basic correction, comprise skew control, at the uniform velocity proofread and correct etc.; (2) utilize splicing correction module 222 that it is spliced again, and further proofread and correct, comprise slant correction, ranks offset correction, overlapping correction etc.; (3) after data processing finishes, utilize image drafting module 223 to draw out scan image according to data processed result.
Figure 11 shows the method flow of image scanning in one embodiment of the present of invention, and this method flow is based on system configuration shown in Figure 1 and Fig. 2, Fig. 3 and scanner 10 hardware configurations shown in Figure 4, and detailed process is as follows:
In step S1101, scanner 10 utilizes form feeding device 11 feeding scanned mediums 41 (as paper), and utilizes 12 pairs of scanned mediums 41 of image collecting device to scan simultaneously, and light signals are organized in parallel obtaining more.In as Fig. 2, Fig. 3 and embodiment shown in Figure 4, the image collecting device 12 of scanner 10 comprises 1201,1202 and two imageing sensors 1203,1204 of two camera lenses.Therefore every paper feed once scans and obtains two width of cloth images
In step S1102, imageing sensor 10 is converted to data image signal with the many groups light signal that is obtained, and is uploaded to main control computer simultaneously.Detailed process comprises: 12 pairs of these light signals of (1) image collecting device carry out opto-electronic conversion, thereby obtain the corresponding simulating electronic signal; (2) further analog-to-digital conversion, thus data image signal obtained; (3) this data image signal is uploaded to main control computer 20.
In step S1103, after main control computer 20 receives data image signal by data transmit-receive unit 21, then at first utilize the basic correction module 221 in the data processing unit 22 that it is carried out basic correction, comprise skew control, at the uniform velocity proofread and correct etc.Its detailed process is consistent with prior art, and the present invention repeats no more herein.
In step S1104, when finish skew control, at the uniform velocity behind the basic correction such as correction, main control computer 20 further utilizes the 222 pairs of data of splicing correction module in the data processing unit 22 to splice correction, comprise processing such as slant correction, ranks offset correction, overlapping correction, the stepping row interpolation computing of going forward side by side, obtain each pixel corresponding gray, concrete processing procedure has been carried out detailed explaination in aforesaid Fig. 8, repeat no more herein.
In step S1105, after the splicing treatment for correcting finished, the data after 222 of correction modules of splicing will be handled were sent into image drafting module 223, and image drafting module 223 is drawn out scan image and storage according to these data.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of image scanning system, comprise scanner and coupled main control computer, described scanner comprises a form feeding device that is used for the feeding scanned medium, and the image collecting device that in form feeding device feeding scanned medium, scans, described main control computer comprises the data processing unit that the picture signal that collects is carried out data processing, it is characterized in that, the image collecting device of described scanner comprises the combination more than a set of shots and imageing sensor, is used for parallel acquisition multiple series of images signal in described form feeding device feeding scanned medium;
Described data processing unit further comprises basic correction module and splicing correction module;
The multiple series of images signal that described basic correction module is uploaded scanner carries out basic correction, comprises skew control and at the uniform velocity correction;
The picture signal of described splicing correction module after to described basic correction resume module further spliced correction, comprises slant correction, ranks offset correction and overlapping correction.
2, image scanning system according to claim 1 is characterized in that, the imageing sensor in the described image collecting device is through the packaged integrated circuits sensitive chip, comprises CMOS or CCD photodiode, and peripheral circuit.
3, image scanning system according to claim 2 is characterized in that, described sensitive chip is the sensitive chip of linear array or face battle array.
4, image scanning system according to claim 1 is characterized in that, described form feeding device comprises Drive Structure and at least one group of coupled relative up and down roller bearing;
Described one group of relative up and down roller bearing comprises initiatively a roller bearing and a supplementary rder, and both fit to clamp scanned medium;
Described Drive Structure comprises stepper motor and coupled worm screw and gear, and described stepper motor passes through worm screw, the described active roller bearing of gear driven, and further drives supplementary rder feeding scanned medium.
5, a kind of image scan method, the system that described method is formed based on scanner and coupled main control computer is characterized in that, said method comprising the steps of:
A. described scanner is the parallel light signal that obtains the scanned medium of the described feeding of many groups in the feeding scanned medium;
B. described scanner is converted to data image signal with the many groups light signal that is obtained, and is uploaded to main control computer simultaneously;
C. after main control computer is received the data image signal that scanner uploads, it is carried out basic correction, comprise skew control and at the uniform velocity proofread and correct;
D. further utilize the sensor bias parameter that described data image signal is spliced correction, described sensor bias parameter obtains by proofreading and correct paper, comprise imageing sensor inclination angle, row deviation, row deviation and paper feed step-length, described splicing is proofreaied and correct and is comprised slant correction, ranks offset correction and overlapping correction;
E. draw out scan image according to the data processed result of abovementioned steps C and D.
6, image scan method according to claim 5 is characterized in that, proofreading and correct paper among the described step C is black and white two looks, and wherein the outside is a white, and black part is divided into isosceles right triangle, and two right-angle side is parallel to the both sides of proofreading and correct paper respectively.
7, image scan method according to claim 5, it is characterized in that, described correction paper only uses black and white two looks: top is chequered with black and white nicking, the width alternation reversed in order of black streaking and informal voucher line from left to right, and in the heart distance remains unchanged in adjacent two black streakings; The right-angled triangle that the bottom is arranged side by side, the angle of triangle base length and wedge angle preestablishes.
8, according to the described image scan method of arbitrary claim in the claim 5 to 7, it is characterized in that described step D comprises the process that data image signal carries out overlapping correction: the distance according to overlapping point and superposition boundary is determined weights.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102098406A (en) * | 2010-12-20 | 2011-06-15 | 东莞市金翔电器设备有限公司 | High-speed scanning method for automatically adjusting paper-feeding speed |
| CN102006393A (en) * | 2010-12-20 | 2011-04-06 | 东莞市金翔电器设备有限公司 | Large format scanning method capable of realizing automatic image deformation correction |
| CN102170513A (en) * | 2011-03-02 | 2011-08-31 | 吴伟佳 | Image scanning device with speed compensation unit and compensation method thereof |
| DE102011018496B4 (en) * | 2011-04-23 | 2013-07-18 | Roth + Weber Gmbh | Scan procedure for a large-format scanner system with stitching method |
| TWI508516B (en) * | 2012-09-06 | 2015-11-11 | Avision Inc | Method for automatically converting scan image file and computer program product executing such method |
| CN103237153A (en) * | 2013-05-13 | 2013-08-07 | 缪建军 | Scanning type optical imaging system for observing surface quality of coating test panel |
| CN104574635B (en) * | 2014-12-27 | 2017-09-29 | 深圳怡化电脑股份有限公司 | CIS imaging sensor correcting fixtures |
| CN104702813A (en) * | 2015-02-11 | 2015-06-10 | 杭州载力科技有限公司 | Multi-CCD spliced scanning mechanism and image processing method through same |
| 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 |
| CN108401085A (en) * | 2018-03-14 | 2018-08-14 | 河北南昊高新技术开发有限公司 | A kind of scan method, scanner and scanning system |
| CN110035206B (en) * | 2019-03-26 | 2020-12-11 | Oppo广东移动通信有限公司 | Image processing method and device, electronic equipment and computer readable storage medium |
| JP7321766B2 (en) * | 2019-05-15 | 2023-08-07 | キヤノン株式会社 | image forming device |
| CN111026939A (en) * | 2020-01-13 | 2020-04-17 | 国网河北省电力有限公司沧州供电分公司 | A intelligent collection cabinet for financial billing |
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