CN109270066A - A kind of line-scan digital camera scan method and device - Google Patents
A kind of line-scan digital camera scan method and device Download PDFInfo
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- CN109270066A CN109270066A CN201811137914.7A CN201811137914A CN109270066A CN 109270066 A CN109270066 A CN 109270066A CN 201811137914 A CN201811137914 A CN 201811137914A CN 109270066 A CN109270066 A CN 109270066A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
The invention discloses a kind of line-scan digital camera scan methods, are used for line-scan digital camera scanning system, comprising steps of obtaining target object image；Multiple mark points are chosen on target object image；High-precision focusing is carried out to the multiple mark point according to the first sequence, successively with the focal position of each mark point of determination；Object is scanned using line-scan digital camera according to the focal position of each mark point.The clarity existing in the prior art using single scan line is overcome as the selection gist of pinpointed focus, so as to cause being easy to appear the unsharp phenomenon of near focal point area image, also generated by the shooting trigger signals of line-scan digital camera by the mobile triggering of carrier, it in this way can be after the mobile stopping of carrier, send shooting trigger signals, line-scan digital camera is avoided to take pictures when carrier is mobile, caused by image fault or inconsistent phenomenon, line-scan digital camera focusing accuracy is improved, to improve scanning accuracy.
Description
Technical field
The present invention relates to pathological section scanning imaging technology field, in particular to a kind of line-scan digital camera scan method and dress
It sets.
Background technique
Linear array scanning camera high speed acquisition just moves to next unit length after having acquired a line every time, continues
The acquisition of next line gets off just to be combined into so a two-dimensional picture for a period of time, is also similar to area array cameras acquisition
The picture arrived.It is uneven due to target object surface in the line-scan digital camera scanning system course of work, it puts object and (is clapped
Take the photograph object/scanned) carrier also have inclination, the focus that will lead to object entirety may vary widely, therefore scan
Before target object, generally requires and focus in the region to be scanned multiple mark points of selection.
In the prior art, line-scan digital camera scanning system focuses to multiple mark points, and that there are accuracy is low, sweeps with scan method
The problem of retouching low efficiency.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to provide that a kind of accuracy is higher, the faster line-scan digital camera scan method of scan efficiency and device.
The technical scheme adopted by the invention is that:
A kind of line-scan digital camera scan method, is used for line-scan digital camera scanning system, and the line-scan digital camera scanning system includes
For the area array cameras and linear array shooting unit of photographic subjects object and for the carrier of drop target object, the linear array shooting unit
Including line-scan digital camera and object lens, comprising steps of
Obtain target object image；
Multiple mark points are chosen on target object image；
High-precision focusing is carried out to the multiple mark point according to the first sequence, successively with the focus of each mark point of determination
Position；
Object is scanned using line-scan digital camera according to the focal position of each mark point.
Further, described that multiple mark points are chosen on target object image, it specifically includes:
Obtain image border and the color information of target object image；
Mark point is chosen according to described image edge, the color information；
According to mark point density degree, mark point is deleted or increased；
The color information includes the shades of gray, and the acquisition image border and color information specifically include:
The image border of target object image is extracted by Edge extraction algorithm；
By handling to obtain grayscale image to object image gray processing, the gray value of grayscale image is extracted, the grey depth is obtained
Degree；
The mark point includes edge labelling point and central marks point, described to be believed according to described image edge, the color
Breath is chosen mark point and is specifically included:
According to image border, several edge labelling points are chosen on described image edge according to the first selection rule；
According to the shades of gray, region is entreated to choose several central marks points in the picture according to the second selection rule；
First selection rule is that the spacing distance between the two neighboring mark point chosen is fixed value；Described second
Selection rule is that default gray value threshold value is chosen for mark point when pixel gray value is greater than gray value threshold value；
It is described to be specifically included according to mark point density degree, deletion or increase mark point:
Spacing distance Low threshold and spacing distance high threshold between default adjacent marker point, judge that each mark point is adjacent thereto
Whether the spacing distance between mark point is greater than spacing distance Low threshold and is less than spacing distance high threshold；
If the spacing distance between mark point mark point adjacent thereto is greater than spacing distance Low threshold and is less than spacing distance
High threshold then retains the mark point；
If the spacing distance between mark point mark point adjacent thereto is less than spacing distance Low threshold, the mark point is deleted；
If the spacing distance between mark point mark point adjacent thereto is higher than spacing distance high threshold, in the mark point and its
Increase mark point between adjacent marker point.
Further, the high-precision focusing specifically includes full focus process or half focus process:
The full focus process includes thick focus process and smart focus process；
Half focus process specifically: with the focal position of previous mark point for the second center, it is right to execute essence
Burnt process；
The thick focus process specifically:
Using linear array shooting unit in multiple shooting height position photographic subjects objects；
In each shooting height position, controls carrier and moved along transverse direction, the line-scan digital camera is according to triggering of taking pictures
Signal shoots multi-strip scanning line image in carrier moving process, to form the reference picture of the shooting height position, the cross
To the direction that direction is perpendicular to the line-scan digital camera scan line；
According to the clarity of the reference picture of different height position, the corresponding height and position of the first focus is determined；
The multiple shooting height position is to terminate between height and position positioned at default first starting height and position and first,
The object lens according to the first default step distance vertically axis from first starting height and position be moved to the first termination height position
It sets, forms multiple shooting height positions；
Described first originates the upper surface that the corresponding focal position of height and position is higher than object, and described first terminates height
The corresponding focal position in position is lower than object lower surface；
The essence focus process specifically:
The corresponding height and position of the first focus is chosen to obtain as the second center, and centered on the second center
The second starting altitude position and second is taken to terminate height and position；
The object lens according to the second default step distance vertically axis from the second starting altitude position be moved to second eventually
Only height and position forms multiple secondary shooting height positions；
Using linear array shooting unit in multiple secondary shooting height position photographic subjects objects；
It in each secondary shooting height position, controls carrier and is moved along transverse direction, the line-scan digital camera is according to taking pictures
Trigger signal shoots multi-strip scanning line image in carrier moving process, to form the reference picture of the shooting height position, institute
Stating transverse direction is the direction perpendicular to the line-scan digital camera scan line；
According to the clarity of the reference picture of different height position, the corresponding height and position of the second focus is determined.
Further, described in each shooting height position, carrier is moved along transverse direction, the line-scan digital camera according to
Trigger signal of taking pictures shoots multi-strip scanning line image in carrier moving process to form the reference picture of the shooting height position,
Including two kinds of embodiments:
First embodiment specifically includes:
After the object lens are moved to current shooting height and position, carrier is moved to along transverse direction from the first lateral position
Second lateral position, the line-scan digital camera shoot multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process；
Then the object lens are moved to next shooting height position, and carrier is moved to the first lateral position from the second lateral position, described
Line-scan digital camera shoots multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process；
Second embodiment specifically includes:
After the object lens are moved to current shooting height and position, carrier is moved to along transverse direction from the first lateral position
Second lateral position, the line-scan digital camera shoot multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process,
Carrier moves back to the first lateral position from the second lateral position；Then the object lens are moved to next shooting height position, carry
Tool is moved to the second lateral position from the first lateral position along transverse direction, and the line-scan digital camera exists according to trigger signal of taking pictures
Multi-strip scanning line image is shot in carrier moving process.
Further, the line-scan digital camera scanning system further includes the controller connecting with the line-scan digital camera and Y-axis electricity
Machine, the carrier move under the driving of the y-axis motor along Y-axis, are taken pictures using the generation of carrier transverse mobile motor and trigger letter
Number；
Frame trigger signal is provided previously to line-scan digital camera；
When reaching default initial position, output line triggering signal driving line-scan digital camera shooting；
The initial position is arranged after the frame trigger signal starts；
The frame trigger signal that is provided previously is specifically included to line-scan digital camera: frame trigger signal is provided previously to line in controller
Array camera, line-scan digital camera enter pre- shooting state；
The line triggering signal is square-wave signal, each rising edge of the line triggering signal or failing edge trigger the line
Array camera shooting is primary, and when the shooting number of the line-scan digital camera reaches preset value, the line-scan digital camera stops shooting.
Further, first sequence refers to:
It determines the first mark point, as full focus marks point, carries out full focus process；
Next mark point is selected according to the first constraint condition, as 1 focus marks point, carries out half focus process；
The mark point for meeting the second constraint condition is re-used as full focus marks point to focus；
First constraint condition includes:
C0 is less than pre-determined distance threshold value with upper mark point distance；
C1, it is minimum with upper mark point distance；
C2 is located in the same connected region with a upper mark point；
Second constraint condition are as follows: be greater than the mark point of pre-determined distance with upper mark point distance or focus using half
Multiple reference picture clarity that process obtains are respectively less than the mark point of default clarity.
Further, scanning uses column scan mode, is scanned according to preset sweep length, schemes in each scan columns
As including at least one mark point.
Further, further include step, after the completion of scanning, by scanning obtain strip scanning area image carry out splicing and
Fusion.
Further, further include step, before scanning starts, white space detection is carried out to the target object image, works as inspection
When measuring the width of white space and being greater than default space width, when scanning, skips the white space.
On the other hand, the present invention also provides a kind of line-scan digital camera scanning means, comprising:
Target image obtains module, for obtaining target object image；
Mark point obtains module, for choosing multiple mark points on target object image；
Focusing module, it is each to determine for successively carrying out high-precision focusing to the multiple mark point according to the first sequence
The focal position of a mark point；
Scan module, for being scanned according to the focal position of each mark point to object.
The beneficial effects of the present invention are:
The present invention is moved by the object lens of line-scan digital camera with carrier jointly, is focused and is marked in different shooting height position acquisitions
Zonule reference picture near note point, overcomes the clarity existing in the prior art using single scan line as pinpointed focus
Selection gist, so as to cause the unsharp phenomenon of near focal point area image is easy to appear, also by be provided previously frame triggering
Signal is to line-scan digital camera；When reaching default initial position, output line triggering signal driving line-scan digital camera shooting solves the prior art
Middle line-scan digital camera shoots the problem of image stretch come or image fault, improves image taking effect.
In addition the present invention includes to some mark points also by using multiple mark points are chosen on target object image
The full focus process of thick focus process and smart focus process, to obtain the focal position of correspondence markings point, to other mark points
It carries out with the focal position of previous mark point executing half focus process of smart focus process for the second center, overcome
The defect of focusing low efficiency caused by full focusing one by one is needed when multiple focus marks points existing in the prior art are focused.
It the composite can be widely applied to various line-scan digital camera scanning systems.
Detailed description of the invention
Fig. 1 is the line-scan digital camera scan method flow chart of one embodiment of the present invention；
Fig. 2 is the schematic diagram that mark point is chosen in the line-scan digital camera scan method of one embodiment of the present invention；
Fig. 3 is the high-precision focus process schematic diagram of the line-scan digital camera scan method of one embodiment of the present invention；
Fig. 4 is that carrier movement is shown in the high-precision focus process of the line-scan digital camera scan method of one embodiment of the present invention
It is intended to；
Fig. 5 is that scanning area is shown in the high-precision focus process of the line-scan digital camera scan method of one embodiment of the present invention
It is intended to；
Fig. 6 is burnt when being the essence focusing of the high-precision focus process of the line-scan digital camera scan method of one embodiment of the present invention
Point position selects schematic diagram；
Fig. 7 is trigger signal timing waveform in line-scan digital camera scan method in the prior art；
Fig. 8 is frame trigger signal, line triggering signal and Y-axis driving signal in line-scan digital camera scanning process in the prior art
Timing waveform；
Fig. 9 is that timing synchronization flow diagram is triggered in the line-scan digital camera scan method of one embodiment of the present invention；
Figure 10 is that frame triggers during triggering timing synchronization in the line-scan digital camera scan method of one embodiment of the present invention
The timing waveform of signal, position signal and line triggering signal；
Figure 11 is that the first sequence of the focus process of the line-scan digital camera scan method of one embodiment of the present invention chooses mark
Note point flow chart；
Figure 12 is that the label of the high-precision focus process of the line-scan digital camera scan method of one embodiment of the present invention clicks
Take schematic diagram；
Figure 13 is the column scan schematic diagram of the line-scan digital camera scan method of one embodiment of the present invention；
Figure 14 is the scanning schematic diagram of the line-scan digital camera scan method of one embodiment of the present invention；
Figure 15 is the objective focal length track schematic diagram of the line-scan digital camera scan method of one embodiment of the present invention；
Figure 16 is a kind of line-scan digital camera scanning means structural block diagram of one embodiment of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
The present invention is used for line-scan digital camera scanning system, including the area array cameras and linear array shooting unit for photographic subjects object
With the carrier and y-axis motor driver for drop target object, carrier is moved under the driving of y-axis motor driver along Y-axis, line
Battle array shooting unit includes line-scan digital camera and object lens.
As shown in Figure 1, be the line-scan digital camera scan method flow chart of one embodiment of the present invention, including step:
S1: target object image is obtained；S2: multiple mark points are chosen on target object image；S3: according to the first sequence to the multiple mark
Note point successively carries out high-precision focusing, with the focal position of each mark point of determination；S4: according to the focal position of each mark point
Object is scanned.
In some embodiment, obtains target object image and use an area array cameras, take pictures to object, obtain
Its image is as the reference picture for choosing mark point.
As shown in Fig. 2, to choose the schematic diagram of mark point in the line-scan digital camera scan method of one embodiment of the present invention,
Mark point 1, mark point 2 2042, mark point 3 2043, mark point 4 2044 and mark point 5 2045 are shown in figure.
The mark point selection that multiple mark points are chosen on target object image specifically includes:
1) it obtains the image border of target object image and color information, color information includes the shades of gray, obtain image
Edge and color information specifically include: the image border of target object image are extracted by Edge extraction algorithm, by mesh
Mark object image gray processing handles to obtain grayscale image, extracts the gray value of grayscale image, obtains the shades of gray.
2) mark point is chosen according to described image edge, the color information, mark point includes edge labelling point and center
Mark point is chosen mark point and is specifically included according to image border, color information:
According to image border, several edge labelling points are chosen on described image edge according to the first selection rule；
According to the shades of gray, region is entreated to choose several central marks points in the picture according to the second selection rule；
First selection rule is that the spacing distance between the two neighboring mark point chosen is fixed value；Described second chooses
Rule is that default gray value threshold value is chosen for mark point when pixel gray value is greater than gray value threshold value；
3) according to mark point density degree, mark point is deleted or is increased, is specifically included:
Spacing distance Low threshold and spacing distance high threshold between default adjacent marker point, judge that each mark point is adjacent thereto
Whether the spacing distance between mark point is greater than spacing distance Low threshold and is less than spacing distance high threshold；
If the spacing distance between mark point mark point adjacent thereto is greater than spacing distance Low threshold and is less than spacing distance
High threshold then retains the mark point；
If the spacing distance between mark point mark point adjacent thereto is less than spacing distance Low threshold, the mark point is deleted；
If the spacing distance between mark point mark point adjacent thereto is higher than spacing distance high threshold, in the mark point and its
Increase mark point between adjacent marker point.
In the present embodiment, object image gray processing is handled to obtain grayscale image, extracts the gray value of grayscale image, obtain ash
Color depth either shallow, gray processing processing are specifically included weighted mean method, are weighted to tri- components of R, G, B with different weights flat
, grayscale image is obtained；Or mean value method is used, and the average value of tri- components of R, G, B of each pixel is found out, it then will be former
Average value in beginning color image assigns the component of these three pixels；Or maximum value process is used, it will be in original color image
R, gray value of the maximum value of tri- component intensities of G, B as grayscale image.
According to the first selection rule, several edge labelling points, the adjacent edge of any two are chosen on image border
Spacing distance between mark point is fixed value d.According to the second selection rule, region is entreated to choose several center marks in the picture
Remember point, it is assumed that the intensity value ranges of grayscale image are 0-255, and presetting gray value threshold value is 133, then when the image middle section pixel
When point gray value is greater than 133, it is chosen for mark point.
As shown in Figure 2, measured zone edge and inside are distributed with mark point, according to the method that mark point obtains, lead to
The image border that Edge extraction algorithm extracts image is crossed, according to image border, according to the first selection rule in described image
Several edge labelling points are chosen on edge, wherein the first selection rule is the interval distance between the two neighboring mark point chosen
From for fixed value, therefore mark point 1, mark point 2 2042 are image border mark point, by handling image gray processing
Grayscale image is obtained, the gray value of grayscale image is extracted, obtains the shades of gray, according to the shades of gray, according to the second selection rule
Several central marks points are chosen in centre region in the picture, and the second selection rule is default gray value threshold value, work as pixel gray level
When value is greater than gray value threshold value, it is chosen for mark point, mark point 3 2043, mark point 4 2044 and mark point 5 2045 are located at figure
As inside, it is marked according to gray scale weight.
Spacing distance range between default adjacent marker point is (a, b), between judging between each mark point and adjacent marker point
Whether gauge is from the spacing distance range (a, b), if so, retaining the mark point, if mark point and one adjacent marker point
Between spacing distance be less than a, then delete the mark point, if the spacing distance between mark point and one adjacent marker point be greater than b,
Increase mark point between the mark point and its this adjacent marker point.
Therefore mark point 3 2043 and mark point 4 2044 shown in Figure 2 should be deleted.
By obtaining image border and the color information of target object image, label is chosen according to image border, color information
Point, and according to mark point density degree, deletes or increases mark point, and randomly selects mark point or simple mathematical in the prior art
Operation is chosen mark point and is compared, more reasonable to the selection of image focal length mark point, avoids subsequent line-scan digital camera scan image
Unsharp problem.
High-precision focusing method includes step of focusing twice in the present embodiment: full focus process and half focus process.
Full focus process includes thick focus process and smart focus process, half focus process specifically: with previous mark point
Focal position be the second center, execute smart focus process.
Wherein thick focus process is as follows:
Comprising steps of 1) shoot mesh in multiple shooting height positions (a shooting height position) using linear array shooting unit
Mark object；2) according to the clarity of the reference picture of different height position, the corresponding height and position of the first focus is determined.
Wherein referred in multiple shooting height position photographic subjects objects in each shooting height position using linear array shooting unit,
It is mobile along transverse direction (Y direction) to control carrier, line-scan digital camera is clapped according to trigger signal is taken pictures in carrier moving process
Multi-strip scanning line image is taken the photograph, to form the reference picture of the shooting height position, transverse direction is to scan perpendicular to line-scan digital camera
The direction of line；
Multiple shooting height positions are to terminate between height and position positioned at default first starting height and position and first, object lens
According to the first default step distance, vertically axis from the first starting height and position is moved to the first termination height and position, is formed more
A shooting height position.In the present embodiment, using object lens, independently of line-scan digital camera movement, (i.e. line-scan digital camera is motionless, and object lens are along Z axis
Direction is mobile) realize that the focusing of linear array shooting unit acts, so that linear array shooting unit is easy to operate.
The corresponding focal position of first starting height and position is higher than the upper surface of object, and first, which terminates height and position, corresponds to
Focal position be lower than object lower surface, in this way setting focusing position, it is ensured that during the focusing process, image clearly obtained
Nonmonotonicity is presented in degree, can guarantee that image that line-scan digital camera obtains from obscuring to clearly again to fuzzy process, that is, covers
Lid can take most clear focusing position.
Smart focus process is as follows:
The corresponding height and position of the first focus is chosen to obtain as the second center, and centered on the second center
The second starting altitude position and second is taken to terminate height and position；Object lens according to the second default step distance vertically axis from second
Starting altitude position is moved to the second termination height and position, forms multiple secondary shooting height positions；Utilize linear array shooting unit
Carrier is controlled along transverse direction in each secondary shooting height position in multiple secondary shooting height position photographic subjects objects
Mobile, line-scan digital camera shoots multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process, to form the shooting
The reference picture of height and position, transverse direction are the direction perpendicular to the line-scan digital camera scan line；According to different height position
Reference picture clarity, determine the corresponding height and position of the second focus.
Wherein focus determines method are as follows: 1) selects the corresponding shooting height position of the highest reference picture of clarity as coke
Point position, 2) by different height reference by location image definition one articulation curve of fitting, select the highest position of clarity
The position on corresponding Z axis is set as focal position.
As shown in figure 3, the high-precision focus process signal of the line-scan digital camera scan method for one embodiment of the present invention
Figure, including line-scan digital camera 102, object lens 101, object lens axis 103, first starting height and position 104, first terminate height and position
105, object lens moving direction (Z-direction) 106, carrier 201, object 203, focus marks point 204 and carrier moving direction (Y
Axis direction) 205.
Target object image is acquired first with area array cameras, and focus marks point is set on the target object image of acquisition
204。
Object 203 is the glass slide for being mounted with pathological section, is placed on carrier 201, avoids connecting with object lens 101
Touching, in order to avoid pollution object lens 101, when focusing, carrier 201 is mobile along carrier moving direction (Y direction) 205.
Line-scan digital camera 102 is connected with object lens 101, and when focusing, line-scan digital camera 102 is fixed, and object lens 101 are along the object lens side of movement
Mobile to (Z-direction) 106, the focusing position of object lens 101 is right from the first starting height and position 104 with the first default step distance
The focal position answered terminates the corresponding focal position of height and position 105, the first starting corresponding focus of height and position 104 to first
Position is higher than the upper surface of object, and first, which terminates the corresponding focal position of height and position 105, is lower than object lower surface, the model
It encloses to cover and shoots most clear focusing position, in actual use, the first starting height and position 104 and first terminates height and position
105 determine in debugging process, are engineering preset value.
As shown in figure 4, for one embodiment of the present invention line-scan digital camera scan method high-precision focus process in carry
Has mobile schematic diagram, including line-scan digital camera 102, object lens 101, object lens axis 103, object lens moving direction (Z-direction)
106, object 203, focus marks point 204, the 205, first lateral position of carrier moving direction (Y direction) 301, second are lateral
Position 302, line-scan digital camera scanning line direction 303, line-scan digital camera scan line peak width 304 and focus marks point motion track
305。
Line-scan digital camera scan line peak width 304 is the distance of the 301 to the second lateral position of the first lateral position 302, right
Jiao Shi, the carrier of drop target object 203 is along carrier moving direction (Y direction) 205 with pre-determined distance movement, carrier movement side
To (Y direction) 205 perpendicular to line-scan digital camera scanning line direction 303, object 203 is in the first lateral position 301 finger: focusing
The center of mark point 204 is located on the first lateral position 301, and object 203 is in the second lateral position 302 finger: focus marks
The center of point 204 is located on the first lateral position 302.
The center of focus marks point 204 is moved between the first lateral position 301 and the second lateral position 302 in moving process
Dynamic, motion track intersects vertically with object lens axis 103.
In each shooting height position, carrier is moved along transverse direction, and line-scan digital camera is being carried according to trigger signal of taking pictures
Multi-strip scanning line image is shot in tool moving process to form the reference picture of the shooting height position, including two kinds of embodiment party
Formula:
First embodiment refers in one embodiment of the invention:
After object lens 101 step to current shooting height and position along object lens moving direction (Z-direction) 106 mobile one,
Carrier drives object 203 to be efficiently translated to the second lateral position 302, linear array phase from the first lateral position 301 with pre-determined distance
Machine shoots multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process；Then object lens 101 continue on object lens
The mobile stepping of moving direction (Z-direction) 106 is moved to next shooting height position, and carrier drives object 203 from the
Two lateral positions 302 are moved to the first lateral position 301, and the line-scan digital camera is according to trigger signal of taking pictures in carrier moving process
Middle shooting multi-strip scanning line image；
I.e. first embodiment refer to carrier drive object 203 the first lateral position 301 and the second lateral position 302 it
Between move back and forth, in moving process, taken pictures trigger signal line-scan digital camera using the generation of carrier transverse mobile motor.
Second embodiment refers in another embodiment of the present invention:
After object lens 101 step to current shooting height and position along object lens moving direction (Z-direction) 106 mobile one,
Carrier drives object 203 to be efficiently translated to the second lateral position 302, linear array phase from the first lateral position 301 with pre-determined distance
Machine shoots multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process, and carrier drives object 203 from second
Lateral position 302 moves back to the first lateral position 301；Then object lens 101 continue on object lens moving direction (Z-direction)
A 106 mobile steppings are moved to next shooting height position, and carrier drives object 203 mobile from the first lateral position 301
To the second lateral position 302, the line-scan digital camera shoots multi-strip scanning line according to trigger signal is taken pictures in carrier moving process
Image；
I.e. second embodiment refers to that carrier drives object 203 to be only moved to the second cross from the first lateral position 301
During position 302, trigger signal is taken pictures to line-scan digital camera using the generation of carrier transverse mobile motor.
As shown in figure 5, for one embodiment of the present invention line-scan digital camera scan method high-precision focus process in sweep
Retouch area schematic, including the first lateral position 301, the second lateral position 302, line-scan digital camera scanning line direction 303, linear array phase
Machine scan line peak width 304, scan line 310, object 203 and carrier moving direction (Y direction) 205.
The scanning range of line-scan digital camera is as shown in fig. 6, being the first lateral position 301 to the second along carrier moving direction
The distance of lateral position 302 is being scanning line direction length along scanning line direction, and line-scan digital camera focusing method of the invention is swept
Retouch acquisition is an area image.
The every movement of object lens is primary, object 203 along perpendicular to the line-scan digital camera scanning line direction 303 with pre-determined distance
It is mobile.
In some embodiment, line-scan digital camera scan line peak width 304 is 16um (i.e. in each shooting height position
Set, the distance that carrier moves along the y axis), line-scan digital camera scanning line direction length is 2000pixel (i.e. along line-scan digital camera
Scanning line direction 303), object 203 moves between the first lateral position (X, Y1) 301 and the second lateral position (X, Y2) 302
Dynamic pre-determined distance is 0.25um or 0.5um.
When pre-determined distance is 0.25um, indicate that the every movement of object lens is primary, object 203 is in 301 He of the first lateral position
When moving between the second lateral position 302,64 trigger signals of taking pictures are sent, that is, there are 64 scan lines to constitute a width shooting figure
Picture, according to 2000pixel*0.25um=500um, 64*0.25um=16um, the scanning area of linear array shooting unit is 500um*
16um or 2000pixel*64pixel.
When pre-determined distance is 0.5um, indicate that the every movement of object lens is primary, object 203 is in the first lateral position 301 and the
When moving between two lateral positions 302,32 trigger signals of taking pictures are sent, that is, there are 32 scan lines to constitute width shooting image,
According to 2000pixel*0.5um=1000um, 32*0.5um=16um, the scanning area of linear array shooting unit is 1000um*
16um or 2000pixel*32pixel.
The selection of pre-determined distance and line-scan digital camera relating to parameters.
Object lens according to the first default step distance vertically axis from first starting height and position be moved to the first termination height
Position is spent, line-scan digital camera obtains multiple pictures and determines that the first focus is corresponding according to the clarity of the image of different height position
Height and position.
Wherein focus determines method are as follows: 1) selects the corresponding shooting height position of the highest reference picture of clarity as coke
Point position, 2) by different height reference by location image definition one articulation curve of fitting, select the highest position of clarity
The position on corresponding Z axis is set as focal position.
As shown in fig. 6, the essence of the high-precision focus process for the line-scan digital camera scan method of one embodiment of the present invention
Focal position selects schematic diagram, including object lens axis 103, first to originate height and position 104, first and terminate height and position when focusing
105, object lens moving direction (Z-direction) 106, the first default step distance 309, the corresponding height and position 401 of the first focus,
Two default step distances 306, the second starting altitude position 307, the second final position 308 and the corresponding height and position of the second focus
402。
In the embodiment, focus method of determination is that the corresponding shooting height position of the selection highest reference picture of clarity is made
For focal position, it is assumed that the first default step distance 309 of setting refers to: being terminated in the first starting height and position 104 and first high
Object lens are mobile (as interval value range may be configured as 20um to 40um) with the first default step distance 309 between degree position 105
10 times, the second default stepping 306 of setting refer between the second starting altitude position 307 and the second final position 308 object lens with
Second default step distance 306 is 12 times mobile (as interval value range may be configured as 8um to 10um), wherein the first focus is corresponding
Height and position 401 refer to: first starting height and position 104 and first terminate height and position 105 between object lens shooting image
The corresponding height and position of shooting focus of the middle highest image of clarity, i.e. the second center, the second starting altitude position 307
With the second final position 308 be centered on the corresponding height and position 401 of the first focus, on it under between 6 movements of each setting
Every, and the second default step distance 306 is less than the first default step distance 309, finally in 307 He of the second starting altitude position
The corresponding height of focus where the highest image of clarity is selected in the image that the shooting of second final position, 308 line-scan digital camera obtains
Degree position is defined as the corresponding height and position 402 of the second focus.
In smart focus process, carrier move mode and shooting Signal trigger mode height corresponding with the first focus is obtained
It is identical when position.
This method is to first pass through the big mobile interval of object lens, immediate focal position is obtained, then again with this
Based on focal position, descends setting in range closely-spaced on it, obtain more accurate focal position, pass through the side of essence focusing
Formula increases focusing accuracy.
Fig. 7 is trigger signal timing waveform in line-scan digital camera scan method in the prior art；
Fig. 8 is frame trigger signal, line triggering signal and Y-axis driving signal in line-scan digital camera scanning process in the prior art
Timing waveform；
As shown in fig. 7, each row pulse triggering signal b shooting is primary when frame trigger signal a is high level.
In the prior art, detected object is usually that carrier is followed to move in Y direction, as shown in figure 8, carrier is by Y
Axis linear motor driver provides Y-axis driving signal c driving, and is that line-scan digital camera persistently provides using encoder or grating scale
Row pulse triggering signal b provides frame triggering high level signal when needing to be scanned shooting to drive line-scan digital camera to shoot.
In this way when scanning, if the frame trigger signal a and subject of line-scan digital camera start mobile signal (Y-axis driving letter
Number c) asynchronous, camera will be made, which to shoot the figure come, stretching or distortion, for example, as in Figure 10, when frame trigger signal a is (high
Level is in trigger position 2), when earlier than Y-axis driving signal c triggering (object to be detected starts to move in t=t1), due to quilt
Detection object does not move, causes to shoot actual detected object repeatedly in same position, and it is existing image stretch occur
As；As frame trigger signal a (when high level is in trigger position 3), (object to be detected is in t=when being later than Y-axis driving signal c triggering
Start to move when t1), since object to be detected has moved a distance, cause to clap actual detected object parts leakage
It takes the photograph, image fault phenomenon occurs.
Fig. 9 is that timing synchronization flow diagram, line are triggered in the line-scan digital camera scan method of one embodiment of the present invention
Array camera scanning system further includes the controller connecting with line-scan digital camera and y-axis motor driver, and the carrier is in the Y-axis electricity
It is moved under the driving of machine driver along Y-axis, the triggering method of synchronization of trigger signal are as follows:
Frame trigger signal (high level) is provided previously to line-scan digital camera in S21；
S22, when reaching default initial position, output line triggering signal driving line-scan digital camera shooting.
Wherein, initial position is arranged after frame trigger signal starts.
Step S21 is specifically included: frame trigger signal (high level) is provided previously to line-scan digital camera in controller, line-scan digital camera into
Enter pre- shooting state.
Step S22 is specifically included: when carrier moves to default initial position, y-axis motor starts to export row triggering letter
Number driving line-scan digital camera shooting.Line triggering signal is square-wave signal, each rising edge of line triggering signal or failing edge triggering
Line-scan digital camera shooting is primary, and when the shooting number of line-scan digital camera reaches preset value, line-scan digital camera stops shooting.
Figure 10 is that frame triggers during triggering timing synchronization in the line-scan digital camera scan method of one embodiment of the present invention
The timing waveform of signal, position signal and line triggering signal, referring to Fig.1 0, controller sends frame trigger signal to line-scan digital camera
A, when frame trigger signal a becomes high level from low level, i.e. when t=t1, line-scan digital camera detects the rising of frame trigger signal
Edge, line-scan digital camera enter pre- shooting state, and y-axis motor starts that carrier is driven to move along Y-direction, when carrier is moved to default starting
When point y=y1, i.e., when initial position is t=t2, y-axis motor sends line triggering signal b, row triggering letter to line-scan digital camera is synchronous
Number b is square-wave signal, and line-scan digital camera starts to shoot, and y-axis motor drives the every mobile preset interval distance of carrier, correspondingly, Y-axis is electric
Machine sends a square-wave signal to line-scan digital camera, when line triggering signal c becomes high level from low level, i.e. when t=t2, and linear array
Camera detects that the rising edge of line triggering signal, line-scan digital camera carry out first time shooting, the touching of each rising edge of line triggering signal
The shooting of hair line array camera is primary, when carrier is moved to default end point y=y2, i.e., when end position is t=t3, and linear array phase
When the shooting number of machine reaches preset value, line-scan digital camera stops shooting.It can be according to the default starting of the length of practical examined object
(starting point, that is, object under test enters first point of the line-scan digital camera shooting visual field, and end point, that is, object under test removes for point and end point
The maximal end point in the line-scan digital camera visual field), according to line triggering signal pulse width and mobile preset interval distance, determine initial position and
End position determines that y-axis motor sends the square wave number of line triggering signal, and then triggers line-scan digital camera shooting, control linear array
The number of camera shooting.Or starting point is preset according to the length of practical examined object and terminates end point, it is triggered according to row
Signal pulse width and mobile preset interval distance, are arranged the shooting number of line-scan digital camera, under the triggering of line triggering signal, line
Array camera calculates shooting number, and when line-scan digital camera shooting number reaches preset value, line-scan digital camera stops shooting.The present embodiment
In, first rising edge signal of line triggering signal is synchronous with initial position, triggers between starting point y1 and end point y2 more
Secondary line-scan digital camera shooting, avoids shooting image stretch or distortion, shooting effect more preferable.
It as shown in figure 11, is the first sequence of the focus process of the line-scan digital camera scan method of one embodiment of the present invention
Mark point flow chart is chosen, wherein the step of focusing to multiple mark points are as follows: S111: the first mark point is determined, as complete
Focus marks point, carries out full focus process；S112: selecting next mark point according to the first constraint condition, as half focusing mark
Remember point, carries out half focus process；S113: the mark point for meeting the second constraint condition is re-used as full focus marks point and is carried out pair
It is burnt.
Wherein the first constraint condition includes:
C0 is less than pre-determined distance threshold value with upper mark point distance；
C1, it is minimum with upper mark point distance；
C2 is located in the same connected region with a upper mark point；
Second constraint condition are as follows: be greater than the mark point of pre-determined distance with upper mark point distance or utilize half focus process
The multiple reference picture clarity obtained are respectively less than the mark point of default clarity.
In the present embodiment, pre-determined distance threshold value d chooses with upper mark point distance less than pre-determined distance threshold value d's
Meet the minimum with upper mark point distance to select in focus marks point of C0 condition to focus marks point, then from what is selected
To focus marks point, and this mark point is judged and whether a upper mark point is located in the same connected region, if being located at same
In one connected region, then this is selected to wait for that focus marks point is carried out as next mark point, and to it according to half focusing mode
Focusing, if not be located at the same connected region in, find it is next meet the first constraint condition to focus marks point conduct
Next mark point.By full focusing mode being respectively adopted or half focusing mode is focused to different mark points, imitate focusing
Rate is higher.
In another embodiment, the mark point of pre-determined distance will be greater than with upper mark point distance or focused using half
The mark point that multiple reference picture clarity that process obtains are respectively less than default clarity is re-used as full focus marks point and carries out
Focusing.
The case where being wherein greater than the mark point of pre-determined distance with upper mark point distance refers to: if current markers point is with before
The distance between one mark point is greater than pre-determined distance, then the point belongs to full focus marks point, needs to carry out full focus process,
Mark point is with reference to half focus process of progress with the mark point in subsequent order.
Using Figure 12 as the mark point of the high-precision focus process of the line-scan digital camera scan method of one embodiment of the present invention
Schematic diagram is chosen, is with mark point 6 2046, mark point 7 2047, mark point 8 2048 and the mark point 9 2049 enumerated in scheming
Example.
When the distance between mark point 8 2048 and mark point 9 2049 are greater than some pre-determined distance, mark point nine
2049, using the corresponding height and position of the second focus of mark point 8 2048 as when focusing with reference to progress essence, can generate biggish mistake
Difference, therefore mark point 9 2049 is revised as the mark point focused entirely, carries out full focus process, that is, it is thick right to need to re-start
Burnt process and smart focus process.
The mark point focused entirely is chosen: multiple reference picture clarity to be obtained using half focus process are respectively less than
The case where mark point of default clarity, refers to: if current markers point (1 focus marks point) utilizes the more of half focus process acquisition
A reference picture clarity is respectively less than default clarity, then the point is converted to full focus marks point, carries out full focus process, thereafter
Mark point is with reference to half focus process of progress with the full focus marks point in continuous sequence.
In some embodiment, presetting clarity is 60, i.e., when judgement essence focusing the image of all acquisitions it is clear
Degree is respectively less than 60, then the mark point need to be converted to full focus marks point, needs to re-start thick focus process and smart focus process,
The adjacent marker point of subsequent order is then with reference to half focus process of progress with the mark point, and this avoid caused by multiple focusing
Deviation accumulation can carry out dynamic calibration in time, guarantee the accuracy of focusing.
It as shown in figure 13, is the column scan schematic diagram of the line-scan digital camera scan method of one embodiment of the present invention, wherein
Scanning uses column scan mode, is scanned according to preset sweep length, at least one label is included in each scan columns
Point, these mark points have different Y locations, and corresponding Z axis position is also different, after the completion of scanning, by the item of scanning acquisition
Shape scanning area image is spliced and is merged, visible in figure to be scanned by column with sweep length 501 to image, until covering
Entire testing image.
It further include white space detection being carried out to described image, when detecting before scanning starts in some embodiment
When the width of white space is greater than default space width, when scanning, skips the white space, blank area field width as shown in the figure
When degree 502 is greater than preset space width, scanning when, skips the region, when carrying out image mosaic after scanning is completed, herein
Area filling blank image or other reasonable images.
It as shown in figure 14, is the scanning schematic diagram of the line-scan digital camera scan method of one embodiment of the present invention, including line
Array camera 102, object lens 101, object lens moving direction 106, carrier 201, object 203, carrier moving direction (Y direction) 205,
Sweep length 501 and scanning direction 601, as seen from the figure, scanning are column scan mode, scanning direction 601 and object lens moving direction
(Z-direction) 106 and carrier moving direction (Y direction) 205 intersect vertically, according to preset sweep length 501, along scanning
Testing image region division at column region, is carried out one column scan of a column by direction 601 in sequence, and each column scanning area includes
At least one mark point.
It as shown in figure 15, is the objective focal length track signal of the line-scan digital camera scan method of one embodiment of the present invention
Figure, including line-scan digital camera 102, object lens 101, object lens moving direction (Z-direction) 106, carrier 201, object 203, focusing mark
Note point 204, corresponding second focal position 701 of focus marks point, objective focal length track 107 and carrier moving direction (Y direction)
205。
In this embodiment it is assumed that including six mark points in a column scan region, each mark point is one second corresponding
Focal position, the second focal position i.e. best focus position of the mark point, when scanning, the focal length of object lens is not unalterable
, body surface is uneven, and different location is distributed different mark points, the focal lengths of object lens along these mark points best coke
Dynamic adjustment is carried out away from position, to reach optimal scan resolution.
It as shown in figure 16, is a kind of line-scan digital camera scanning means structural block diagram of one embodiment of the present invention, comprising: mesh
Logo image obtains module, and for obtaining target object image, mark point obtains module, multiple labels are chosen on target object image
Point, Focusing module, for successively carrying out high-precision focusing to the multiple mark point according to the first sequence, with each label of determination
The focal position of point, scan module, for being scanned according to the focal position of each mark point to object.In some implementations
It further include image mosaic module in example, for after the completion of scanning, the strip scanning area image that scanning obtains to be spliced
And fusion, the present apparatus is for executing any of the above-described kind of line-scan digital camera scan method.
The present invention is moved by the object lens of line-scan digital camera with carrier jointly, is focused and is marked in different shooting height position acquisitions
Zonule reference picture near note point, overcomes the clarity existing in the prior art using single scan line as pinpointed focus
Selection gist also pass through the shooting of line-scan digital camera so as to cause the unsharp phenomenon of near focal point area image is easy to appear
Trigger signal is generated by the mobile triggering of carrier, can be sent shooting trigger signals after the mobile stopping of carrier in this way, be avoided linear array
Camera is taken pictures when carrier is mobile, caused by image fault or inconsistent phenomenon, improve line-scan digital camera focusing accuracy, from
And improve scanning accuracy.
In addition the present invention includes to some mark points also by using multiple mark points are chosen on target object image
The full focus process of thick focus process and smart focus process, to obtain the focal position of correspondence markings point, to other mark points
It carries out with the focal position of previous mark point executing half focus process of smart focus process for the second center, overcome
The defect of focusing low efficiency caused by full focusing one by one is needed when multiple focus marks points existing in the prior art are focused.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of line-scan digital camera scan method, is used for line-scan digital camera scanning system, the line-scan digital camera scanning system includes using
In the area array cameras and linear array shooting unit of photographic subjects object and for the carrier of drop target object, the linear array shooting unit packet
Include line-scan digital camera and object lens, which is characterized in that comprising steps of
Obtain target object image；
Multiple mark points are chosen on target object image；
High-precision focusing is carried out to the multiple mark point according to the first sequence, successively with the focus position of each mark point of determination
It sets；
Object is scanned using line-scan digital camera according to the focal position of each mark point.
2. a kind of line-scan digital camera scan method according to claim 1, which is characterized in that described to be selected on target object image
Multiple mark points are taken, are specifically included:
Obtain image border and the color information of target object image；
Mark point is chosen according to described image edge, the color information；
According to mark point density degree, mark point is deleted or increased；
The color information includes the shades of gray, and the acquisition image border and color information specifically include:
The image border of target object image is extracted by Edge extraction algorithm；
By handling to obtain grayscale image to object image gray processing, the gray value of grayscale image is extracted, the shades of gray are obtained；
The mark point includes edge labelling point and central marks point, described to be selected according to described image edge, the color information
Mark point is taken to specifically include:
According to image border, several edge labelling points are chosen on described image edge according to the first selection rule；
According to the shades of gray, region is entreated to choose several central marks points in the picture according to the second selection rule；
First selection rule is that the spacing distance between the two neighboring mark point chosen is fixed value；Described second chooses
Rule is that default gray value threshold value is chosen for mark point when pixel gray value is greater than gray value threshold value；
It is described to be specifically included according to mark point density degree, deletion or increase mark point:
Spacing distance Low threshold and spacing distance high threshold between default adjacent marker point, judge each mark point label adjacent thereto
Whether the spacing distance between point is greater than spacing distance Low threshold and is less than spacing distance high threshold；
If the spacing distance between mark point mark point adjacent thereto is greater than spacing distance Low threshold and is less than the high threshold of spacing distance
Value, then retain the mark point；
If the spacing distance between mark point mark point adjacent thereto is less than spacing distance Low threshold, the mark point is deleted；
If the spacing distance between mark point mark point adjacent thereto is higher than spacing distance high threshold, adjacent thereto in the mark point
Increase mark point between mark point.
3. a kind of line-scan digital camera scan method according to claim 1, which is characterized in that the specific packet of high-precision focusing
Include full focus process or half focus process:
The full focus process includes thick focus process and smart focus process；
Half focus process specifically: with the focal position of previous mark point for the second center, execute essence and focused
Journey；
The thick focus process specifically:
Using linear array shooting unit in multiple shooting height position photographic subjects objects；
In each shooting height position, controls carrier and moved along transverse direction, the line-scan digital camera is according to trigger signal of taking pictures
Multi-strip scanning line image is shot, in carrier moving process to form the reference picture of the shooting height position, the transverse direction side
To for the direction perpendicular to the line-scan digital camera scan line；
According to the clarity of the reference picture of different height position, the corresponding height and position of the first focus is determined；
The multiple shooting height position is to terminate between height and position positioned at default first starting height and position and first, described
Object lens according to the first default step distance vertically axis from first starting height and position be moved to the first termination height and position, shape
At multiple shooting height positions；
Described first originates the upper surface that the corresponding focal position of height and position is higher than object, and described first terminates height and position
Corresponding focal position is lower than object lower surface；
The essence focus process specifically:
The corresponding height and position of the first focus is chosen as the second center, and obtains centered on the second center
Two starting altitude positions and second terminate height and position；
The object lens according to the second default step distance vertically axis from the second starting altitude position be moved to the second termination height
Position is spent, multiple secondary shooting height positions are formed；
Using linear array shooting unit in multiple secondary shooting height position photographic subjects objects；
In each secondary shooting height position, controls carrier and moved along transverse direction, the line-scan digital camera is according to triggering of taking pictures
Signal shoots multi-strip scanning line image in carrier moving process, to form the reference picture of the shooting height position, the cross
To the direction that direction is perpendicular to the line-scan digital camera scan line；
According to the clarity of the reference picture of different height position, the corresponding height and position of the second focus is determined.
4. a kind of line-scan digital camera scan method according to claim 3, which is characterized in that described in each shooting height position
It sets, carrier is moved along transverse direction, and the line-scan digital camera is a plurality of according to taking pictures trigger signal in carrier moving process and shooting
Scanning yoke picture is to form the reference picture of the shooting height position, including two kinds of embodiments:
First embodiment specifically includes:
After the object lens are moved to current shooting height and position, carrier is moved to second from the first lateral position along transverse direction
Lateral position, the line-scan digital camera shoot multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process；Then
The object lens are moved to next shooting height position, and carrier is moved to the first lateral position, the linear array from the second lateral position
Camera shoots multi-strip scanning line image according to trigger signal of taking pictures in carrier moving process；
Second embodiment specifically includes:
After the object lens are moved to current shooting height and position, carrier is moved to second from the first lateral position along transverse direction
Lateral position, the line-scan digital camera shoot multi-strip scanning line image, carrier according to trigger signal of taking pictures in carrier moving process
The first lateral position is moved back to from the second lateral position；Then the object lens are moved to next shooting height position, carrier edge
Transverse direction be moved to the second lateral position from the first lateral position, the line-scan digital camera is according to trigger signal of taking pictures in carrier
Multi-strip scanning line image is shot in moving process.
5. a kind of line-scan digital camera scan method according to claim 4, which is characterized in that the line-scan digital camera scanning system
It further include the controller and y-axis motor being connect with the line-scan digital camera, the carrier is under the driving of the y-axis motor along Y-axis
Movement generates trigger signal of taking pictures using carrier transverse mobile motor；
Frame trigger signal is provided previously to line-scan digital camera；
When reaching default initial position, output line triggering signal driving line-scan digital camera shooting；
The initial position is arranged after the frame trigger signal starts；
The frame trigger signal that is provided previously is specifically included to line-scan digital camera: frame trigger signal is provided previously to linear array phase in controller
Machine, line-scan digital camera enter pre- shooting state；
The line triggering signal is square-wave signal, each rising edge of the line triggering signal or failing edge trigger the linear array phase
Machine shooting is primary, and when the shooting number of the line-scan digital camera reaches preset value, the line-scan digital camera stops shooting.
6. a kind of line-scan digital camera scan method according to claim 3, which is characterized in that first sequence refers to:
It determines the first mark point, as full focus marks point, carries out full focus process；
Next mark point is selected according to the first constraint condition, as 1 focus marks point, carries out half focus process；
The mark point for meeting the second constraint condition is re-used as full focus marks point to focus；
First constraint condition includes:
C0 is less than pre-determined distance threshold value with upper mark point distance；
C1, it is minimum with upper mark point distance；
C2 is located in the same connected region with a upper mark point；
Second constraint condition are as follows: be greater than the mark point of pre-determined distance with upper mark point distance or utilize half focus process
The multiple reference picture clarity obtained are respectively less than the mark point of default clarity.
7. a kind of line-scan digital camera scan method according to claim 1, which is characterized in that scanning uses column scan mode,
It is scanned according to preset sweep length, image includes at least one mark point in each scan columns.
8. a kind of line-scan digital camera scan method according to claim 7, which is characterized in that further include step, scanning is completed
Afterwards, the strip scanning area image that scanning obtains is spliced and is merged.
9. a kind of line-scan digital camera scan method according to claim 1, which is characterized in that further include step, scanning starts
Before, white space detection is carried out to the target object image, when the width for detecting white space is greater than default space width,
The white space is skipped when scanning.
10. a kind of line-scan digital camera scanning means characterized by comprising
Target image obtains module, for obtaining target object image；
Mark point obtains module, for choosing multiple mark points on target object image；
Focusing module, for successively carrying out high-precision focusing to the multiple mark point according to the first sequence, with each mark of determination
Remember the focal position of point；
Scan module, for being scanned according to the focal position of each mark point to object.
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