CN107218891A - A kind of dimension measurement method, apparatus and system - Google Patents
A kind of dimension measurement method, apparatus and system Download PDFInfo
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- CN107218891A CN107218891A CN201710557586.5A CN201710557586A CN107218891A CN 107218891 A CN107218891 A CN 107218891A CN 201710557586 A CN201710557586 A CN 201710557586A CN 107218891 A CN107218891 A CN 107218891A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
Abstract
The embodiments of the invention provide a kind of dimension measurement method, apparatus and system, wherein this method comprises the following steps：Receive the hot spot of the laser projected in the first image for including object under test, first image comprising two parallel laser transmitters to object under test；The distance between two parallel laser transmitter movements are obtained, the first focal length when obtaining second pixel distance of first pixel distance, object under test of the hot spot on first image on first image and shooting first image；The actual size of object under test is calculated according to the distance between two parallel laser transmitter movements, the first pixel distance, the second pixel distance and the first focal length.The problem of electric inspection process measurement error is larger and less efficient in the prior art is solved by the present embodiment.
Description
Technical field
The present invention relates to fields of measurement, and in particular to a kind of dimension measurement method, apparatus and system.
Background technology
With the long-term work of some large-scale outdoor equipments, especially power equipment, and for a long time exposed to extraneous ring
In border, cause electric power, the problems such as slight crack, damage occur on grid equipment, it is possible to cause the power equipment dangerous, in order to pre-
The generation of anti-the fact that, is at this moment accomplished by carrying out the actual inspections such as electric inspection process, wind-powered electricity generation inspection, it is necessary to blower fan, shaft tower etc.
The defect and injury situation that power equipment is present monitor and assess in real time, the size and location of defect are determined, so as to rapid
Disposal, reduces harm.
And in the prior art, the routine inspection mode such as electric inspection process has plenty of by Laser Radar Scanning, accurate model is generated
Actual size is calculated, this equipment cost is higher, and data volume is larger, and processing time is longer, it is impossible to obtain testee in real time
Size；Have plenty of by single-point laser ranging, equipment cost is higher, it is necessary to be mounted in together with camera on three axle heads, this
Sample may result in that total system is larger, and equipment is heavier, and general camera focus numerical value is all not accurate enough, causes to push away after participating in computing
Calculate resultant error excessive.Therefore, in the prior art, to there is measurement error larger for the method for measurement, and measurement process is not convenient enough,
Less efficient the problem of.
The content of the invention
Therefore, the technical problem to be solved in the present invention be to overcome in the prior art electric inspection process measurement error it is larger and effect
The problem of rate is relatively low, so as to provide a kind of dimension measurement method, apparatus and system.
Therefore, the embodiments of the invention provide following technical scheme：
The embodiments of the invention provide a kind of dimension measurement method, comprise the following steps：Receive the comprising object under test
The hot spot of the laser projected in one image, described first image comprising two parallel laser transmitters to the object under test；Obtain
The distance between described two parallel laser transmitter movements are taken, first pixel of the hot spot in described first image is obtained
Distance, second pixel distance of the object under test in described first image and first when shooting described first image
Focal length；According to the distance between described two parallel laser transmitter movements, first pixel distance, second pixel away from
From and first focal length calculate the actual size of the object under test.
Preferably, the dimension measurement method also includes：The second image for including the object under test is received, it is described to be measured
Object is located on a power equipment, and the edge of the power equipment is also included in second image；Obtain second image
Described in object under test to the edge the 3rd pixel distance, and shoot second image when the second focal length；According to
The distance between described two parallel laser transmitter movements, first pixel distance, first focal length, the 3rd picture
Element distance and second focal length calculate positional information of the object under test on the power equipment.
Preferably, the actual size for calculating object under test is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is that the second pixel distance of the object under test on F, the first image is OP,
Object under test actual size is OR.
Preferably, the positional information for calculating object under test on power equipment is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is F, and the second focal length when shooting second image is F', the second figure
As the 3rd pixel distance at upper object under test power equipment edge into image is OP', object under test to power equipment edge
Actual range be OR'.
The embodiment of the present invention additionally provides a kind of dimension measuring device, including：Image receiving unit, is treated for receiving to include
Survey the laser projected in the first image of object, described first image comprising two parallel laser transmitters to the object under test
Hot spot；Data capture unit, for obtaining the distance between described two parallel laser transmitter movements, obtains the hot spot
The second pixel distance in described first image of the first pixel distance, the object under test in described first image, with
And the first focal length during shooting described first image；Computing unit, for according to described two parallel laser transmitter movements it
Between distance, first pixel distance, second pixel distance and first focal length calculate the reality of the object under test
Border size.
Preferably, described image receiving unit, is additionally operable to receive the second image for including the object under test, described to be measured
Object is located on a power equipment, and the edge of the power equipment is also included in second image；The data capture unit,
It is additionally operable to obtain object under test described in second image to the 3rd pixel distance at the edge, and shoots described second
The second focal length during image；The computing unit, be additionally operable to according to the distance between described two parallel laser transmitter movements,
First pixel distance, first focal length, the 3rd pixel distance and second focal length calculate the determinand
Positional information of the body on the power equipment.
The embodiment of the present invention additionally provides a kind of Size Measuring System, including：Parallel laser transmitter, picture pick-up device, number
According to processing equipment, wherein, two parallel laser transmitters project laser to object under test；The picture pick-up device shoots described
The hot spot of the laser is included in the image of object under test, described image；The data processing equipment is used for：Receive comprising to be measured
The laser projected in first image of object, described first image comprising two parallel laser transmitters to the object under test
Hot spot；The distance between described two parallel laser transmitter movements are obtained, first of the hot spot on the image is obtained
Pixel distance, the object under test the second pixel distance on the image and the first focal length when shooting described image；
According to the distance between described two parallel laser transmitter movements, first pixel distance, second pixel distance and
First focal length calculates the actual size of the object under test.
Preferably, the data processing equipment is additionally operable to：The second image for including the object under test is received, it is described to be measured
Object is located on a power equipment, and the edge of the power equipment is also included in second image；Obtain second image
Described in object under test to the edge the 3rd pixel distance, and shoot second image when the second focal length；According to
The distance between described two parallel laser transmitter movements, first pixel distance, first focal length, the 3rd picture
Element distance and second focal length calculate positional information of the object under test on the power equipment.
Technical scheme of the embodiment of the present invention, has the following advantages that：
A kind of dimension measurement method provided in an embodiment of the present invention, apparatus and system, coordinate zoom by generating laser
Camera carries out the acquisition of image, can fast and accurately calculate the size of defect present on power equipment, and this lacks
The positional information of power equipment is trapped in, helps inspection analysis personnel to judge the importance of existing defects and necessity of reparation rapidly
Property, solve electric inspection process measurement error in the prior art it is larger, it is less efficient the problem of, make inspection analyze personnel quickly should
Right, rapid disposal significantly reduces lesion larger risk and harm.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of dimension measurement method of the embodiment of the present invention；
Fig. 2 is another flow chart of dimension measurement method of the embodiment of the present invention；
Fig. 3 is the structure chart of dimension measuring device of the embodiment of the present invention；
Fig. 4 is the structure chart of Size Measuring System of the embodiment of the present invention.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than indicate or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or implying relative importance.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can just be combined with each other into conflict.
Embodiment 1
The embodiment of the present invention provides a kind of dimension measurement method, and Fig. 1 is the flow of dimension measurement method of the embodiment of the present invention
Figure, as shown in figure 1, this method comprises the following steps：
S101：Receive in the first image for including object under test, described first image comprising two parallel laser transmitters
The hot spot of the laser projected to the object under test.
S102：The distance between described two parallel laser transmitter movements are obtained, the hot spot are obtained described first
The second pixel distance and shooting of the first pixel distance, the object under test in described first image on image is described
The first focal length during the first image.
S103：According to the distance between described two parallel laser transmitter movements, first pixel distance, described
Two pixel distances and first focal length calculate the actual size of the object under test.
By above-mentioned steps S101 to S103, the dimension measurement method of the embodiment of the present invention is according to generating laser movement
Distance, pixel distance of pixel distance, object under test of two laser faculas on image on image and shoot the image
When focal length, you can calculate the actual size of object under test.Object under test can rapidly and accurately be calculated by this method
Actual size, improve the efficiency of inspection, help inspection analysis personnel to make a response rapidly, judge whether to repair it
It is multiple.
Below in conjunction with specific example, each step to the dimension measurement method of the embodiment of the present invention is described further.
Above-mentioned steps S101, receives parallel sharp comprising two in the first image for including object under test, described first image
The hot spot for the laser that optical transmitting set is projected to the object under test.Specifically, it is parallel by fixing two on zoom camera
Generating laser, makes two parallel laser transmitters to the parallel laser of two beams is projected on power equipment, while zoom camera
Power equipment is taken pictures using big focal length, by demarcating and debugging in advance, enables two laser faculas got first
Clearly indicated in image.
Above-mentioned steps S102, obtains the distance between described two parallel laser transmitter movements, obtains the hot spot and exists
The second pixel distance in described first image of the first pixel distance, the object under test in described first image and
Shoot the first focal length during described first image.Specifically, the distance between the two parallel laser transmitter movements are obtained,
Pixel distance in first image between two laser faculas, the pixel distance of object under test in the first image, and shoot
The focal length of zoom camera during first image.
Above-mentioned steps S103, according to the distance between described two parallel laser transmitter movements, first pixel away from
From the actual size that, second pixel distance and first focal length calculate the object under test.Specifically, according to getting
The distance between two parallel laser transmitter movements, the pixel distance in the first image between two laser faculas,
The focal length of the pixel distance of object under test and zoom camera when shooting first image in first image, you can calculate to be measured
The actual size of object.
Preferably, the actual size for calculating object under test is related in step S103, is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is that the second pixel distance of the object under test on F, the first image is OP,
Object under test actual size is OR.
Specifically, the first pixel distance LP is exactly the pixel distance between two laser faculas in the first image, and first is burnt
Away from the focal length that F is zoom camera when shooting first image, the second pixel distance OP of the object under test on the first image is
The pixel distance of object under test in the first image, the actual size of object under test can be calculated by above-mentioned formula.
Fig. 2 is another flow chart of dimension measurement method of the embodiment of the present invention, as shown in Fig. 2 the chi of the embodiment of the present invention
Very little measuring method is further comprising the steps of：
Step S201, receives the second image for including the object under test, and the object under test is located on a power equipment,
The edge of the power equipment is also included in second image.Specifically, the picture centre alignment object under test shot is kept
Center, zoom camera shoots the second image using small focal length, includes power equipment on second image, and to be measured
Object is located on the power equipment, while the edge of the power equipment can clearly be shown on second image.
Step S202, obtains object under test described in second image to the 3rd pixel distance at the edge, and
Shoot the second focal length during second image.Specifically, object under test is obtained in second image to power equipment edge
Each pixel distance, and focal length of zoom camera when shooting second image by small focal length.
Step S203, according to the distance between described two parallel laser transmitter movements, first pixel distance, institute
State the first focal length, the 3rd pixel distance and second focal length and calculate the object under test on the power equipment
Positional information.Specifically, according to the distance between two parallel laser transmitter movements got, two in the first image
Pixel distance between laser facula, object under test in the focal length of zoom camera, second image when shooting first image
To each pixel distance at power equipment edge, and when shooting second image zoom camera focal length, by calculating
Go out the actual range to each edge of power equipment of object under test, you can measure specific position of the object under test on power equipment
Put.
Preferably, step S203 calculates positional information of the object under test on power equipment, is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is F, and the second focal length when shooting second image is F', the second figure
As the 3rd pixel distance at upper object under test power equipment edge into image is OP', object under test to power equipment edge
Actual range be OR'.
Specifically, the first pixel distance LP is exactly the pixel distance between two laser faculas in the first image, and first is burnt
The focal length of zoom camera during away from F to shoot first image, the second focal length F' is zoom camera when taking the photograph second image
The 3rd pixel distance OP' at object under test power equipment edge into image on focal length, the second image be the second image in treat
Object is surveyed to each pixel distance at power equipment edge, object under test can be calculated by above-mentioned formula each to power equipment
The actual range at individual edge.
In actual applications, above-mentioned object under test can in use produce for power equipment slight crack, Friction mark
The defects such as mark.When zoom camera is shot using small focal length, the defect will substantially become very little, at this moment need to know this
Particular location of the defect on whole power equipment, to quickly find the position in being repaired in inspection.At this moment the defect is passed through
To pixel distance of the edge of power equipment on the second image, when the comparison of the second image taking is upright, you can second
The defect is obtained on image to the pixel distance at four edges in upper and lower, left and right of power equipment, and then by above-mentioned formula, point
The defect is not calculated to the actual range on four borders in power equipment upper and lower, left and right, so as to learn that this lacks exactly
It is trapped in the particular location of power equipment.
By above-mentioned steps method, the problem of electric inspection process measurement efficiency is low in the prior art is solved, inspection is analyzed
Personnel learn that rapidly the size and the defect of defect, in the particular location of power equipment, are handled it as the case may be.
Embodiment 2
The present invention applies example and also provides a kind of dimension measuring device, and Fig. 3 is the knot of dimension measuring device of the embodiment of the present invention 30
Composition, as shown in figure 3, the dimension measuring device includes：
Image receiving unit 31 is flat comprising two in the first image for including object under test, first image for receiving
The hot spot for the laser that row generating laser is projected to object under test；Data capture unit 32, for obtaining two parallel laser hairs
The distance between emitter movement, obtains the first pixel distance between the hot spot in described first image, object under test in institute
The first focal length when stating the second pixel distance on the first image and shooting first image；Computing unit 33, for basis
The distance between two parallel laser transmitter movements, the first pixel distance, the second pixel distance and the first focal length calculate to be measured
The actual size of object.
Computing unit 33 calculates the actual size of object under test, is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is that the second pixel distance of the object under test on F, the first image is OP,
Object under test actual size is OR.
Specifically, the first pixel distance LP is exactly the pixel distance between two laser faculas in the first image, and first is burnt
Away from the focal length that F is zoom camera when shooting first image, the second pixel distance OP of the object under test on the first image is
The pixel distance of object under test in the first image, the actual size of object under test can be calculated by above-mentioned formula.
Preferably, the image receiving unit 31, is additionally operable to receive the second image for including object under test, object under test is located at
On one power equipment, the edge of the power equipment is also included in second image；The data capture unit 32, is additionally operable to acquisition
In two images object under test to power equipment edge the 3rd pixel distance, and shoot the second image when the second focal length；Should
Computing unit 33, be additionally operable to according to the distance between two parallel laser transmitter movements, the first pixel distance, the first focal length,
3rd pixel distance and the second focal length calculate positional information of the object under test on the power equipment.
Computing unit 33 calculates positional information of the object under test on power equipment, is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is F, and the second focal length when shooting second image is F', the second figure
As the 3rd pixel distance at upper object under test power equipment edge into image is OP', object under test to power equipment edge
Actual range be OR'.
Specifically, the first pixel distance LP is exactly the pixel distance between two laser faculas in the first image, and first is burnt
The focal length of zoom camera during away from F to shoot first image, the second focal length F' is zoom camera when taking the photograph second image
The 3rd pixel distance OP' at object under test power equipment edge into image on focal length, the second image be the second image in treat
Object is surveyed to each pixel distance at power equipment edge, object under test can be calculated by above-mentioned formula each to power equipment
The actual range at individual edge.
In actual applications, above-mentioned object under test can in use produce for power equipment slight crack, Friction mark
The defects such as mark.When zoom camera is shot using small focal length, the defect will substantially become very little, at this moment need to know this
Particular location of the defect on whole power equipment, to quickly find the position in being repaired in inspection.At this moment the defect is passed through
To pixel distance of the edge of power equipment on the second image, when the comparison of the second image taking is upright, you can second
The defect is obtained on image to the pixel distance at four edges in upper and lower, left and right of power equipment, and then by above-mentioned formula, point
The defect is not calculated to the actual range on four borders in power equipment upper and lower, left and right, so as to learn that this lacks exactly
It is trapped in the particular location of power equipment.
Embodiment 3
The present invention applies example and provides a kind of Size Measuring System, and Fig. 4 is the structure chart of Size Measuring System of the embodiment of the present invention,
As shown in figure 4, including：Parallel laser transmitter 41, picture pick-up device 42, data processing equipment 43, wherein,
Two parallel laser transmitters 41 project laser to object under test.
Picture pick-up device 42 shoots the image containing object under test, projects the light of laser in the image comprising generating laser 41
Spot.
Data processing equipment 43 is used for：Receive flat comprising two in the first image for including object under test, first image
The hot spot for the laser that row generating laser 41 is projected to object under test；Obtain two movements of parallel laser transmitter 41 between away from
From obtaining hot spot the first pixel distance on this image, object under test the second pixel distance on this image and shoot
The first focal length during image；According to the distance between two parallel laser transmitter movements, the first pixel distance, the second pixel away from
From and the first focal length calculate object under test actual size.
The actual size of object under test is calculated, is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is that the second pixel distance of the object under test on F, the first image is OP,
Object under test actual size is OR.
Specifically, the first pixel distance LP is exactly the pixel distance between two laser faculas in the first image, and first is burnt
Away from the focal length that F is zoom camera when shooting first image, the second pixel distance OP of the object under test on the first image is
The pixel distance of object under test in the first image, the actual size of object under test can be calculated by above-mentioned formula.
Preferably, the data processing equipment 43 is additionally operable to：Receive the second image for including object under test, the determinand position
In on a power equipment, the edge of the power equipment is also included in second image；Object under test in second image is obtained to arrive
3rd pixel distance at the power equipment edge, and the second focal length when shooting second image；According to two parallel lasers
The distance between transmitter movement, the first pixel distance, the first focal length state the 3rd pixel distance and the second focal length calculates to be measured
Positional information of the object on power equipment.
Positional information of the object under test on power equipment is calculated, is calculated by below equation,
Wherein, the distance between two parallel laser transmitter movements are LR, the first pixel distance of two laser faculas
For LP, the first focal length when shooting described first image is F, and the second focal length when shooting second image is F', the second figure
As the 3rd pixel distance at upper object under test power equipment edge into image is OP', object under test to power equipment edge
Actual range be OR'.
Specifically, the first pixel distance LP is exactly the pixel distance between two laser faculas in the first image, and first is burnt
The focal length of zoom camera during away from F to shoot first image, the second focal length F' is zoom camera when taking the photograph second image
The 3rd pixel distance OP' at object under test power equipment edge into image on focal length, the second image be the second image in treat
Object is surveyed to each pixel distance at power equipment edge, object under test can be calculated by above-mentioned formula each to power equipment
The actual range at individual edge.
In actual applications, above-mentioned object under test can in use produce for power equipment slight crack, Friction mark
The defects such as mark.When zoom camera is shot using small focal length, the defect will substantially become very little, cannot be in the second image
On see the concrete shape of the defect clearly, at this moment need to know particular location of the defect on whole power equipment, to patrol
The position is quickly found in checking maintenance.At this moment the pixel distance by the edge of the defect to power equipment on the second image,
When the comparison of the second image taking is upright, you can the defect is obtained on the second image to the upper and lower, left and right of power equipment
The pixel distance at four edges, and then by above-mentioned formula, calculates the defect to power equipment upper and lower, left and right four respectively
The actual range on border, so as to learn particular location of the defect in power equipment exactly.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (8)
1. a kind of dimension measurement method, it is characterised in that comprise the following steps：
Receive and include the first image of object under test, two parallel laser transmitters are included in described first image to described to be measured
The hot spot of the laser of object projection；
Obtain the distance between described two parallel laser transmitter movements, obtain the of the hot spot in described first image
The second pixel distance in described first image of one pixel distance, the object under test and when shooting described first image
The first focal length；
According to the distance between described two parallel laser transmitter movements, first pixel distance, second pixel away from
From and first focal length calculate the actual size of the object under test.
2. dimension measurement method according to claim 1, it is characterised in that also include：
The second image for including the object under test is received, the object under test is located on a power equipment, second image
In also include the edge of the power equipment；
Object under test described in second image is obtained to the 3rd pixel distance at the edge, and shoots second figure
The second focal length during picture；
According to the distance between described two parallel laser transmitter movements, first pixel distance, first focal length, institute
State the 3rd pixel distance and second focal length calculates positional information of the object under test on the power equipment.
3. dimension measurement method according to claim 1, it is characterised in that the actual size of the calculating object under test leads to
Below equation calculating is crossed,
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</mrow>
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Wherein, the distance between two parallel laser transmitter movements are LR, and the first pixel distance of two laser faculas is LP,
The first focal length when shooting described first image is that the second pixel distance of the object under test on F, the first image is OP, determinand
Body actual size is OR.
4. dimension measurement method according to claim 2, it is characterised in that the calculating object under test is on power equipment
Positional information calculated by below equation,
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Wherein, the distance between two parallel laser transmitter movements are LR, and the first pixel distance of two laser faculas is LP,
The first focal length when shooting described first image is F, and the second focal length when shooting second image is on F', the second image
3rd pixel distance at object under test power equipment edge into image is OP', reality of the object under test to power equipment edge
Distance is OR'.
5. a kind of dimension measuring device, it is characterised in that including：
Image receiving unit, it is parallel sharp comprising two in the first image for including object under test, described first image for receiving
The hot spot for the laser that optical transmitting set is projected to the object under test；
Data capture unit, for obtaining the distance between described two parallel laser transmitter movements, obtains the hot spot and exists
The second pixel distance in described first image of the first pixel distance, the object under test in described first image and
Shoot the first focal length during described first image；
Computing unit, for according to the distance between described two parallel laser transmitter movements, first pixel distance, institute
State the second pixel distance and first focal length calculates the actual size of the object under test.
6. dimension measuring device according to claim 5, it is characterised in that
Described image receiving unit, is additionally operable to receive the second image for including the object under test, the object under test is located at one
On power equipment, the edge of the power equipment is also included in second image；
The data capture unit, is additionally operable to obtain threeth pixel of the object under test to the edge described in second image
Distance, and the second focal length during shooting second image；
The computing unit, is additionally operable to according to the distance between described two parallel laser transmitter movements, first pixel
Distance, first focal length, the 3rd pixel distance and second focal length calculate the object under test in the electric power
Positional information in equipment.
7. a kind of Size Measuring System, it is characterised in that including：Parallel laser transmitter, picture pick-up device, data processing equipment,
Wherein,
Two parallel laser transmitters project laser to object under test；
The picture pick-up device shoots the hot spot for including the laser in the image of the object under test, described image；
The data processing equipment is used for：
Receive and include the first image of object under test, two parallel laser transmitters are included in described first image to described to be measured
The hot spot of the laser of object projection；
The distance between described two parallel laser transmitter movements are obtained, the first picture of the hot spot on the image is obtained
Element distance, the object under test the second pixel distance on the image and the first focal length when shooting described image；
According to the distance between described two parallel laser transmitter movements, first pixel distance, second pixel away from
From and first focal length calculate the actual size of the object under test.
8. Size Measuring System according to claim 7, it is characterised in that the data processing equipment is additionally operable to：
The second image for including the object under test is received, the object under test is located on a power equipment, second image
In also include the edge of the power equipment；
Object under test described in second image is obtained to the 3rd pixel distance at the edge, and shoots second figure
The second focal length during picture；
According to the distance between described two parallel laser transmitter movements, first pixel distance, first focal length, institute
State the 3rd pixel distance and second focal length calculates positional information of the object under test on the power equipment.
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