CN100553281C

CN100553281C - Camera imaging scanning method

Info

Publication number: CN100553281C
Application number: CNB2004100779074A
Authority: CN
Inventors: 王赋琛; 卢燕; 王华国
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-20
Filing date: 2004-09-20
Publication date: 2009-10-21
Anticipated expiration: 2024-09-20
Also published as: CN1635777A; WO2006032184A1

Abstract

The present invention relates to a kind of camera imaging scanning method, for literal, image are carried out method for scanning.It adopts the digital camera pictures taken, corrects the picture distortion according to the deformation rule of picture then, last relative position assembly unit picture according to each picture.Digital camera comprises general high-grade camera and the camera bare machine that designs for graph scanning specially, has only the camera of a set of shots, charge coupled device ccd, set of circuits, simple shell and an indispensable member that is:.The present invention also studied for obtain standard chart board that photograph deformation designs, for correct picture be out of shape to the bat picture method of restoring, method and corresponding scanning device that revised picture is spliced, have easy to use, the scanning accuracy height, one-object-many-purposes, maintenance cost is low and convenient, and excellent characteristics such as can upgrade.

Description

Camera imaging scanning method

Technical field

The present invention relates to pattern digitization---the scan method of character image scanning, particularly the character image scan method of employing numeral taking photo technology.Belong to International Classification of Patents G06K9/20 " image is caught " technical field.

Background technology

The imageing sensor (charge coupled device ccd) that present scanner (being referred to as the plain scan instrument at this) all adopts one dimension to arrange carries out graph scanning, be about to transducer and line up a row, line of single pass (the about 10 μ m of width), along with the conversion of transducer with the graph position of sweeping, a line of a line of scanner figure is scanned just finished whole graph scanning.The conversion of transducer and graph position has dual mode, a kind ofly is that drawing is motionless and transducer moves---and flatbed scanner a kind ofly is that transducer is motionless and drawing moves---drum type scanner.

1. because relatively moving of drawing and transducer will guarantee the precision of scanning patter, the processing and the installation of the transmission device of scanner (comprising stepping motor, belt, pulley, gear, guide rail etc.), the arrangement of transducer is exquisiteness very.Scanner speed is fast more, and scanning patter is big more, and precision prescribed is just high more.Therefore, the cost and price of large format scanner and rapid file graphics scanner (A4 and A3 breadth are arranged at present) very high (the rapid file graphics scanner have up to 600,000 yuan; A1 breadth flat bed scanner is up to 600,000 yuan; 62 " breadth drum scanning instrument is up to 1,300,000 yuan; Surpassing the wide large format drum scanning instrument of 2m will be expensive more because its required precision is higher).2. small breadth low gear scanner low price, but speed is slow and can not sweep big figure; The rapid file graphics scanner can only be swept to the figure of A4 and A3 breadth, can not sweep big figure; Large format scanner is because cost an arm and a leg, and the life-span is limited, can not be long-term as file scanning, even if use also inconvenient (with respect to the small breadth scanner) once in a while.The application of various scanners all has limitation: should sweep big figure and scan heap file again fast and must buy two kinds of scanners.3. because the plain scan instrument all has in order to adjust the mobile device of transducer and drawing relative position, long-term use will produce wearing and tearing, and mobile device is very big to the scanning accuracy influence, so the wearing and tearing of mobile device are with the image scan precision---and the precision of plain scan instrument can reduce along with long-term use.4. for large format drum scanning instrument, drawing adorn the bad holding paper that is easy to generate, especially to shabby drawing---the fragile drawing of large format drum scanning instrument.5. for large format drum scanning instrument, because drawing thickness difference, fineness difference (coefficient of friction difference), so chart drive speed is not quite similar when the air roll rotating speed is identical---the drum scanning instrument has certain error.6. because cost an arm and a leg and the attribute of precision instrument, so large format drum scanning instrument needs special messenger's keeping to use, and has limited more people and has grasped the graph scanning technology.7. single because of costing an arm and a leg with function of use, much need the unable purchase of user of large format scanner and rapid file graphics scanner, reduced the popularity rate of this kind equipment, also slowed down the digitlization process.

Summary of the invention

Purpose of the present invention is to remedy deficiency of the prior art, provides a kind of easy to use, scanning accuracy height, one-object-many-purposes, the camera imaging scanning method that maintenance cost is low.

The research of camera imaging scanning method:

Along with the development of digital photo technologies, the digital camera of high definition, high-performance, high-resolution (1,200 ten thousand pixel) has dropped to below 5000 yuan at present.If such high-performance camera is used for figure and file scanning, both can promote the application level of digital camera, also can significantly reduce the cost of rapid file scanning and large format graph scanning equipment, thereby improve the purchasing power of large format graph scanning equipment and rapid file scanning device, this will advance the development of digitlization process to a certain extent.

But any photographic equipment is taken a picture all certain deformation, can not be directly used in graph scanning.For example Fig. 1 is that (the standard network trrellis diagram also can be made of point or certain mark arranged according to certain rules a width of cloth standard network trrellis diagram, but the lines better effects if.Grid line promptly can be vertically and horizontally arranged; Also can arrange polar coordinates system by other means as concentric circles and homocentric rays formation; Mesh spacing can be identical, also can be different), Fig. 2 is the photo of standard network trrellis diagram, can obviously see the distortion of this photo.Because machine error and assembly error, the distortion that each camera is taken a picture is different, and at the relative position of camera and drawing and optical parametric not simultaneously, the deformation rule that same camera is taken a picture is difference also.

The camera imaging scanning method principle:

Find that through practice under the constant situation of, camera position motionless at drawing and optical parametric, the gained anamorphose amount that repeats to take pictures is identical, their deformation rule is identical, and this is by the imaging law decision of optical lens.Because this rule of photographic imagery, constant in digital camera position and optical parametric, under the identical situation in drawing position,, thereby can carry out the image restoration conversion to every width of cloth image according to its deformation rule by the deformation rule of the piece image wherein deformation rule of other image as can be known.Standard grid pattern shown in Figure 1 taken pictures can obtain deformation rule under this condition, according to such deformation rule image 2 is restored to obtain image shown in Figure 3, image 4 is restored obtain image 5.

Because the resolution and the definition of digital camera are limited, the resolution that the digital camera of 1,200 ten thousand pixels is taken 400mm * 300mm image is every millimeter 10 point.For the large format drawing, if only take a photos, its resolution is too low, and is difficult for differentiating the tiny pixel of drawing.Therefore, should drawing be divided into the capable N row of a M zone take pictures, form the figure chip arrays of the capable N row of M according to required precision and figure paper size; Every width of cloth picture is changed recovery respectively by its deformation rule; According to the relation of each picture, remove the lap of every width of cloth picture and other pictures again, promptly do not have lap after the figure chip arrays that the capable N of M is listed as is stitched together, do not lose image again.

It more than is exactly the principle of camera imaging scanning method.

Technical scheme of the present invention is as follows.

A kind of camera imaging scanning method, for literal, image are carried out method for scanning, it adopts the digital camera pictures taken, corrects the picture distortion according to the deformation rule of picture then, last relative position assembly unit picture according to each picture.

Described digital camera comprises general high-grade camera and the camera bare machine that designs for graph scanning specially, has only the camera of a set of shots, charge coupled device ccd, set of circuits, simple shell and an indispensable member that is:.

Inventive point is included as the standard chart board that obtains photograph deformation and design, and described standard chart board can be made of grid line, also can be made of point or certain mark arranged according to certain rules, and the former effect is better; Grid line or certain mark promptly can be vertically and horizontally arranged, also can arrange by other means, as the polar coordinates system of concentric circles and homocentric rays formation; Mesh spacing can be identical, also can be different.

Inventive point is included as corrects the method that the picture distortion is restored the bat picture: design the standard chart board, with the same terms---camera optics parameter, position and illumination condition, shooting standard chart board and the figure that need scan, determine the deformation rule of other pictures according to the deformation rule of standard chart board photo, correct the distortion of picture according to the deformation rule of each picture.

Inventive point comprises the method that revised picture is spliced: the figure chip arrays that the big figure of a width of cloth is divided into the capable N row of M by grid, form the capable N row of a M zone, each picture should comprise the figure of corresponding region fully, to only keeping the image in this picture corresponding region after each picture correction, press the corresponding relation assembly unit then in the view picture figure.

The scanning device of camera imaging scanning method of the present invention, as shown in Figure 6, installing is by the digital camera of 1～No. 12 same model on frame, be provided with cable release 13～18 between same row's camera, the concentrated button 19 of cable release is set at the terminal drift angle of the upper ledge of framework, in the fixed frame 20 of equipment, be provided with the chart board 21 of placing drawing, on chart board 21, be printed on the test pattern of standard grid.

Be printed on the test pattern of standard grid on the described chart board 21, its anyhow fine rule be used for the deformation parameter of determining that each digital camera is taken a picture, thick line is used to cut apart the effective image of every width of cloth picture anyhow; No. 1 image that camera is clapped is No. 1 picture, image in 1 ' number zone of chart board in the thick line scope is exactly the effective coverage of No. 1 picture, No. 1 picture will comprise all images in the thick line scope in 1 ' number zone, and the image after No. 1 picture is restored only keeps the effective coverage of No. 1 picture when splicing; The rest may be inferred, and other pictures are handled by the same way, promptly can finish the assembly unit of a drawing.

A plurality of digital cameras are fixed on the framework by certain arrangement mode, and guarantee that camera position does not have small mobile variation.

All by cable release control, cable release both can concentrate in order to scan the concentrated button of big drawing each camera, also can use separately, in order to scanning small breadth pictograph data.

The contrast of photographic imagery scanning (instrument) method of the present invention and plain scan instrument is as follows:

1. easy to use:

1. can design and adopt portable scanning means of the present invention, utilize this device can when going on business, carry out graphic file scanning;

2. flat equipment, drawing is paved and is got final product, and drawing is easy for installation;

3. can scan the image and the scraggly image of thick chart board;

4. need not link to each other with computer during scanning patter, do not need special interface, do not take computer resource during scanning patter, the phenomenon that can't sweep figure when also not existing with the paralysis of the computer of scanning device interface, USB (USB) interface by the digital camera common configuration during tablet pattern both can be input in the computer;

When 5. illumination condition is good, has a power failure and also can sweep figure;

6. can provide large format scanning device (because of the characteristic of this scan method, the large format scanning device only need increase the digital camera of some and increase the area of scanning table top, but does not influence scanning accuracy, so the increase of cost is very little) according to user's request.

2. scanning accuracy height:

Drawing does not move in the scanning process, and camera is fixed when taking pictures, so scanning result can reach the precision of standard chart board in theory.

3. one-object-many-purposes

The main hardware of system is a digital camera, can be used for scanning, shooting and photography, not only can handle official business but also can be used for amusement;

One cover photographic imagery scanner promptly can be used for the scanning of large format drawing, also can be used for rapid file scanning (being equivalent to many cover small breadth fast scanners).

4. maintenance cost is low and convenient:

Because the main hardware digital camera cost of photographic imagery scanner is low and be made up of a plurality of cameras, so, change a camera (outfit replacement camera) after certain camera breaks down and still can use, the maintenance cost of camera is far below the maintenance cost of plain scan instrument.

5. can upgrade:

Because the main hardware digital camera cost of photographic imagery scanner is low, so along with the upgrading of digital camera, the photographic imagery scanner also can upgrade.

Description of drawings

Fig. 1 is the standard network trrellis diagram;

Fig. 2 is the photo of standard network trrellis diagram;

Fig. 3 is the photo of standard network trrellis diagram after restoring;

Fig. 4 is and Fig. 2 photograph taking environment facies photo together;

Fig. 5 is the photo after the deformation parameter of employing Fig. 2 photo restores;

Fig. 6 is a fixed platform formula photographic imagery scanning device schematic diagram;

Fig. 7 is the scanner device schematic diagram behind the installation drawing;

Fig. 8 is each camera demobilization splicing figure of efficient image afterwards that takes a picture;

Fig. 9 shows is the target area that No. 1 picture is clapped;

Figure 10 is No. 1 picture.

Embodiment

Camera imaging scanning method of the present invention: 1. use digital camera (comprise bare machine: the digital camera that designs for graph scanning specially---have only a set of shots, charge coupled device ccd, set of circuits and a simple shell.Its cost will be cheaper, the scanning better effects if) pictures taken; 2. correct picture distortion---image restoration according to the deformation rule of each picture; 3. according to the relative position assembly unit picture of each picture (picture after assembly unit is restored).

As shown in Figure 6, this equipment is exactly a kind of structure that realizes camera imaging scanning method.In Fig. 6, what mark for 1～No. 12 is the digital camera of same model, 13～No. 18 marks be the cable release of digital camera, No. 19 marks be that (if the cable release of each camera is all linked this button, each camera is taken pictures simultaneously during by this button for the concentrated button of cable release.The shutter of each camera also can use separately, thereby takes pictures separately), No. 20 is the fixed frame of equipment, and No. 21 for placing the chart boards (also being the test pattern that is printed on the standard grid) of drawing, and camera and chart board are fixed on No. 20 frameworks.On No. 21 chart boards, fine rule is used for the deformation parameter of determining that each digital camera is taken a picture anyhow, and thick line is used to cut apart the effective image of every width of cloth picture anyhow.No. 1 image that camera is clapped is No. 1 picture, image in 1 ' number zone of chart board in the thick line scope is exactly the effective coverage of No. 1 picture, No. 1 picture will comprise all images in the thick line scope in 1 ' number zone, and the image after No. 1 picture is restored only keeps the effective coverage of No. 1 picture when splicing.Other pictures are handled the assembly unit that just can finish a drawing by same procedure.

The operating process of photographic imagery scanning device shown in Figure 6: digital camera (digital camera can arbitrarily be dismantled and install, and can carry out daily photograph at ordinary times) 1. is installed; 2. system initialization---shooting is painted with the chart board of standard network trrellis diagram, thereby obtains the deformation rule of each digital camera; 3. lay the drawing (see figure 7) and take pictures and have the original image of certain variations rule; 4. USB (USB) interface by the digital camera common configuration is input to picture in the computer and foundation deformation rule recovery picture separately; 5. the effective coverage assembly unit that will restore the back picture is in the appointed area of final picture, referring to Fig. 8.If scanning large format drawing, the cable release of each camera all will be connected to be concentrated on the button, presses this button and once can scan the view picture drawing, sweeps a width of cloth figure less than a second; As scanning small breadth (A4 or A3 breadth) figure or file, then the cable release of each camera uses separately, each camera all can scan separately, a camera per minute can scan 30～60 width of cloth figure or files, corresponding to device shown in Figure 6, if 12 people operation is arranged, can reach the sweep speed of per minute 300～700 width of cloth figures or file.

The restored method (is example with No. 1 picture) of distortion picture, as shown in Figure 1: for No. 1 picture, institute's image of clapping should comprise the interior all images of 1 ' number regional thick line scope fully.This zone is by straight line O1-O2, O2-O3, and O3-O4, the O4-O1 delineation only is useful on the Ny bar level grid line (literal in figure and shade square for restored method be described fill out) vertical with the Nx bar of determining deformation rule, referring to Fig. 9.The grid line spacing is D, and these regional height and width are

H＝YO4-YO1＝D×(Ny-1)

W＝XO2-XO1＝D×(Nx-1)

If the coordinate that O1 is ordered is X1 ', Y1 ' (for 2 ' number zone is X2 ', Y2 ', and the rest may be inferred), the coordinate that PP is ordered is

Xi，j＝X1’+D×i

Yi，j＝Y1’+D×j

Figure 10 is the picture in 1 ' number zone, and this picture only is bordering on level and vertical lines (literal among the figure and shade square are filled out after being), and they have now become curve corresponding to level among Fig. 9 and vertical straight line.In the thick line scope of picture 10 (comprising thick line), be bordering on vertical curve and the subhorizontal curve of Ny bar by the Nx bar and can determine the capable Nx row of a Ny intersection point, these intersection points are corresponding to the intersection point of horizontal line among Fig. 9 and vertical line.Q1～Q4 four intersection points can adopt bilinear transformation that image (shadow region) in this four point range is restored corresponding to four intersection points of Q1～Q4 among Fig. 9 in Figure 10, and it is straightway that bilinear transformation defines this regional border; Nine intersection points of P1～P9 are corresponding to nine intersection points of P1～P9 among Fig. 9 among Figure 10, can adopt biparabolic transfer that image (shadow region) in these nine intersection point scopes is restored, it is parabola that biparabolic transfer defines this regional border, this conversion makes among Figure 10 in nine intersection points of P1～P9 and Fig. 9 nine intersection points of P1～P9 corresponding one by one, and Fig. 3 and Fig. 5 adopt this conversion gained exactly; 16 intersection points of a～p are corresponding to 16 intersection points of a～p among Fig. 9 among Figure 10, can adopt that image (shadow region) restores in two cube transfer pair m, n, o, p four point ranges, and the border that two cubes of transform definitions should the zone is a cubic curve.9 point transformation and 16 point transformation are all than 4 point transformation precision height, but 16 point transformation are more numerous and diverse, so should adopt 9 point transformation.

Claims

1. A photographic imaging scanning method, which is a method for scanning text and images, is characterized in that: it adopts a digital camera to shoot raw materials to obtain an original picture, and then corrects the deformation of the original picture according to the deformation law of the original picture to obtain the restored result pictures, and finally according to the relative positions of the restored pictures, the restored pictures are assembled to obtain the final scanned picture;

A standard drawing board designed to obtain the deformation law of the picture: the standard drawing board can be composed of grid lines or certain marks arranged according to a certain rule; the grid lines or certain marks can be arranged horizontally or vertically, or can be Arranged in a polar coordinate system composed of concentric circles and concentric rays; the grid spacing can be the same or different.

2. The photographic imaging scanning method according to claim 1, characterized in that: the method for restoring the captured picture to correct the deformation of the picture: design a standard drawing board, with the same conditions - camera optical parameters, position and lighting conditions , shoot the standard drawing board and the graphics that need to be scanned, determine the deformation law of other pictures according to the deformation law of the standard drawing board photo, and correct the deformation of the picture according to the deformation law of each picture.

3. The photographic imaging scanning method according to claim 1, characterized in that: the method of splicing the corrected pictures: divide a large picture into a picture array of M rows and N columns according to the grid, forming M rows and N columns Each picture should completely contain the graphics in the corresponding area. After each picture is corrected, only the image in the corresponding area of the picture should be kept, and then assembled into the whole graphic according to the corresponding relationship.

4. The scanning device of the photographic imaging scanning method according to claim 1, characterized in that: digital cameras of the same model No. 1 to No. 12 are installed on the frame, and shutter cables (13) are arranged between the same row of cameras. ～(18), the centralized button (19) of shutter line is set on the frame, is provided with the standard chart board (21) that places blueprint in the fixed frame (20) of equipment, is printed on the standard chart board (21) Standard graphics for grids.

5. The scanning device according to claim 4, characterized in that: the standard drawing board (21) is printed with a standard graphic of a standard grid, and its horizontal and vertical thin lines are used to determine the deformation of the photos taken by each digital camera Parameters, the horizontal and vertical thick lines are used to divide the effective image of each picture; the image taken by the No. 1 camera is the No. 1 picture, and the image within the range of the thick line in the No. It will contain all the images within the range of the thick line in the No. 1' area, and only keep the effective area of the No. 1 picture when splicing the restored image of the No. 1 picture; and so on, process the other pictures in the same way, and you can Complete the assembly of a drawing.

6. The scanning device according to claim 4, characterized in that a plurality of digital cameras are fixed on the frame in a certain arrangement, and it is ensured that there is no slight movement of the camera positions.

7. The scanning device according to claim 4, characterized in that: each camera is controlled by a shutter cable, and the shutter button can be concentrated on the centralized button for scanning large drawings, or can be used alone to scan small format Graphic text data.