CN108709502A - Crack vision measurement device based on parallel laser and measurement method - Google Patents
Crack vision measurement device based on parallel laser and measurement method Download PDFInfo
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- CN108709502A CN108709502A CN201810360469.4A CN201810360469A CN108709502A CN 108709502 A CN108709502 A CN 108709502A CN 201810360469 A CN201810360469 A CN 201810360469A CN 108709502 A CN108709502 A CN 108709502A
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses the crack vision measurement devices based on parallel laser, include parallel laser device and the mobile phone with camera, parallel laser device covers after being detachably secured to mobile phone, plug-in camera lens can also be installed on camera, mobile phone is built-in with image processing module, and parallel laser device is also electrically connected mobile phone.Crack vision measurement device its overall volume based on parallel laser of the present invention is small, at low cost, is suitable for contactless measurement.The invention also discloses the methods for carrying out vision measurement using above-mentioned measuring device.
Description
Technical field
The invention belongs to vision measurement device technical fields, are related to a kind of crack vision measurement dress based on parallel laser
It sets, the invention further relates to the methods for carrying out vision measurement using above-mentioned measuring device.
Background technology
It is constantly progressive with intelligent, automation, the every field such as modern equipment manufacture are to control and machining accuracy
It is required that higher and higher, monitoring and protection to building, artifact, mechanical equipment etc. increasingly refine.When measured target institute
Place position is difficult to close, if the artifact on overhanging cliff, measured target local environment are severe, such as high temperature and pressure or has poison ring
Border, measured target are object surface texture or slight crack, can not directly be measured with survey tool, measured target can connect because of any
It just needs to carry out non-cpntact measurement when touching and change in size occurs.
Dimension measurement method is varied, wherein can realize that the automation to target is high-precision using optics and image technique
Degree measures, and is such as passed through by shooting image from fixed-distance shooting image or using telecentric lens to the measurement of accessory size
It calculates number of pixels to measure, but common lens dimensional measurement needs to predict shooting distance, telecentric lens volume is big, of high cost
And coverage is small.Now widely used total powerstation is measured using laser ranging and High-precision angle, realizes the ruler to target
Very little measurement, but equipment is expensive, it is big using difficulty, and distance is remoter, cross measure precision is lower.Be badly in need of now it is a kind of it is small,
It is at low cost, precision is high, suitable for being widely popularized contactless measurement.
Invention content
The object of the present invention is to provide a kind of crack vision measurement device based on parallel laser, overall volume is small, at
This is low, is suitable for contactless measurement.
The first technical solution of the present invention is that the crack vision measurement device based on parallel laser includes
Parallel laser device and mobile phone with camera, parallel laser device cover after being detachably secured to mobile phone, and mobile phone is built-in with figure
As processing module, parallel laser device is also electrically connected mobile phone.
The first of the invention technical solution is further characterized in that,
Plug-in camera lens is also equipped on camera.
Parallel laser device includes shell, and case top is full transparent glass, and an emission level laser beam is provided in shell
Laser emitter, the direction of the laser beam of laser transmitter projects is provided with a parallelogram clear optical glass, put down
Row quadrangle clear optical glass is provided with optics semi-permeable membrane, parallelogram transparent optical close to the one side of laser emitter
One side of the glass far from laser emitter is provided with optical total-reflection film, is provided with optics semi-permeable membrane and optical total-reflection film
Two sides are parallel and are 45 ° with horizontal sextant angle, and the laser beam of laser transmitter projects is all-trans through optics semi-permeable membrane and optics
It penetrates film and reflects to form two collimated light beams from case top injection, housing bottom covers after being detachably secured to mobile phone.
Laser Power Devices switch is also equipped on shell, Laser Power Devices switch is by conducting wire connection laser emitter, on mobile phone
It is additionally provided with USB interface, USB interface, which is connected with, connects USB converter, and USB converter passes through conducting wire and Laser Power Devices switch connection.
It is covered after mobile phone and is fixed with magnetic metal piece, housing bottom is fixed with strong magnets, mobile phone and parallel laser
It is fixed by the suction-combining force of magnetic metal piece and strong magnets.
Second of technical solution that the present invention uses be：Crack vision measuring method based on parallel laser, use are above-mentioned
Crack vision measurement device based on parallel laser selects the plug-in camera lens of proper focal length to be mounted on the camera shooting of mobile phone first
On head, parallel laser device is then opened, parallel laser device sends out parallel laser alignment measured target, and takes pictures to target,
Then the image processing module built in mobile phone carries out spot center extraction using the visual signature of laser facula to the image of shooting,
Then pixel distance/number of pixels dn between the two laser facula optical centers that parallel laser generates is calculated, and with parallel laser device
The center spacing dl of the parallel laser light beam sent out is calculated pixel actual size as measuring basis or is sent out with laser emitter
Lasing beam diameter as measuring basis calculate pixel actual size, finally according to pixel actual size realize to measured target ruler
Very little measurement.
Second of technical solution of the invention be further characterized in that,
Image processing module carries out the specific of spot center extraction using the visual signature of laser facula to the image of shooting
Method is：
Step 1, laser facula position is clicked on mobile phone screen, it is exactly to detect ring to determine spot detection region i.e.,
Color and Intensity threshold Separation are carried out in detection ring interior focusing spot；
Step 2, algorithm of region growing is executed to the Threshold segmentation result of step 1, generates the regional edge of two laser faculas
Boundary；
Step 3, geometric center point is sought in the region generated to step 2, then calculates the pixel between two geometric center points
Distance/number of pixels dn.
Size s=pr × tn of measured target, wherein tn are measured target shared pixel number, pr in captured image
The actual size of areas imaging is corresponded to for each pixel in image.
If laser emitter uses common laser transmitter, using the center spacing dl of parallel laser light beam as measurement base
Standard, then pr=dl/dn；
If laser emitter uses parallel laser transmitter, using lasing beam diameter cd as measuring basis, if image
The a diameter of cn of hot spot pixel of upper generation, then each pixel corresponds to the actual size pr=cd/cn of areas imaging in image.
Mobile phone is touch-screen mobile phone, and mobile phone screen is human-computer interaction interface, and image processing module is included in built in mobile phone
Processor and the screen surveyors' staff being arranged on human-computer interaction interface, processor is using the visual signature of laser facula to clapping
The image taken the photograph carries out spot center extraction, and the pixel distance between the two laser facula optical centers that then calculating parallel laser generates/
Number of pixels dn, and the center spacing dl of the parallel laser light beam sent out with parallel laser device or with laser emitter send out swash
Beam diameter calculates the actual size that each pixel in image corresponds to areas imaging as measuring basis, then according to screen display
The measurement graticule of the ratio setting screen surveyors' staff of the actual size of size areas imaging corresponding with each pixel in image, most
Realize that the measurement to measured target size, the size of measured target are shown in human-computer interaction interface according to pixel actual size afterwards
On, it is directly read by the measurement graticule being arranged thereon.
The invention has the advantages that the center spacing for the parallel laser light beam that the present invention is sent out using parallel laser device is made
Visual size measurement method is devised by the extraction to laser spot center for measuring basis, can be realized to quilt at a distance
The fine measurement of target size is surveyed, there is extensive practical application.
Description of the drawings
Fig. 1 is the structural schematic diagram of the crack vision measurement device the present invention is based on parallel laser；
Fig. 2 is the structural schematic diagram of parallel laser device in the crack vision measurement device the present invention is based on parallel laser；
Fig. 3 is the practical measurement figure of the crack vision measurement device the present invention is based on parallel laser；
Fig. 4 is the flow chart of the crack vision measuring method the present invention is based on parallel laser；
Fig. 5 is the interface schematic diagram of human-computer interaction interface in the crack vision measurement device the present invention is based on parallel laser.
In figure, 1. parallel laser devices, 2. laser emitters, 3. optical glass, 4. optics semi-permeable membranes, 5. optical total-reflections
Film, 6. laser beams, 7. strong magnets, 8.USB interfaces, 9. Laser Power Devices switch, 10. human-computer interaction interfaces, 11. screens measure mark
Ruler, 12. shooting laser faculas, 13. mobile phones, 14. measure graticules, and 15. take pictures control button, 16. shells, 17. detection rings, and 18.
Camera, 19. plug-in camera lenses, 20. magnetic metal pieces, 21.USB converters, 22. measured targets, 23. laser faculas, 24. is tested
Objective plane, 25. collimated light beams.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The present invention is based on the crack vision measurement device of parallel laser, structure is as shown in Figure 1, include parallel laser device
1 and the mobile phone 13 with camera 18, parallel laser device 1 covered after being detachably secured to mobile phone 13, mobile phone 13 is built-in with figure
As processing module, parallel laser device 1 is also electrically connected mobile phone 13.
Plug-in camera lens 19 is also equipped on camera 18.
As shown in Fig. 2, parallel laser device 1 includes shell 16,16 top of shell is full transparent glass, is provided in shell 16
The direction of the laser emitter 2 of one emission level laser beam, the laser beam 6 emitted along laser emitter 2 is provided with one parallel four
Side shape clear optical glass 3, parallelogram clear optical glass 3 are provided with optics half close to the one side of laser emitter 2
Permeable membrane 4, one side of the parallelogram clear optical glass 3 far from laser emitter 2 are provided with optical total-reflection film 5, setting
There are two sides of optics semi-permeable membrane 4 and optical total-reflection film 5 parallel and be 45 ° with horizontal sextant angle, laser emitter 2 emits
Laser beam reflect to form two collimated light beams 25 through optics semi-permeable membrane 4 and optical total-reflection film 5 and projected from the top of shell 16, shell
16 bottom of body covers after being detachably secured to mobile phone 13.
Laser Power Devices switch 9 is also equipped on shell 16, Laser Power Devices switch 9 connects laser emitter 2, hand by conducting wire
USB interface 8 is additionally provided on machine 13, USB interface 8, which is connected with, connects USB converter 21, and USB converter 21 passes through conducting wire and laser
Power switch 9 connects.
It is covered after mobile phone 13 and is fixed with magnetic metal piece 20,16 bottom of shell is fixed with strong magnets 7,13 peace of mobile phone
Row laser 1 is fixed by the suction-combining force of magnetic metal piece 20 and strong magnets 7.
Second of technical solution that the present invention uses be：Crack vision measuring method based on parallel laser, use are above-mentioned
Crack vision measurement device based on parallel laser, as shown in figure 3, the plug-in camera lens 19 of selection proper focal length first is mounted on hand
On the included camera 18 of machine 13, parallel laser device 1 is then opened, parallel laser device 1 sends out parallel laser alignment measured target,
The control button 15 of taking pictures pressed on mobile phone takes pictures to measured target 22, then the image processing module profit built in mobile phone 13
Spot center extraction is carried out to the image of shooting with the visual signature of laser facula, then calculates two laser that parallel laser generates
Hot spot 23 shoots pixel distance/number of pixels dn between the optical center of the shooting laser facula 12 shown on the image, and with flat
The center spacing dl for the parallel laser light beam that row laser 1 is sent out is calculated pixel actual size as measuring basis or is sent out with laser
The lasing beam diameter that emitter 2 is sent out calculates pixel actual size as measuring basis, finally according to the realization pair of pixel actual size
The measurement of measured target size；In Fig. 3, measured target 22 is crack, in the measured target plane 24 residing for it.
As shown in figure 4, image processing module carries out spot center using the visual signature of laser facula to the image of shooting
The specific method of extraction is：
Step 1, laser facula position is clicked on 13 screen of mobile phone, it is exactly to detect ring to determine spot detection region i.e.
17, carry out color and Intensity threshold Separation in detection ring interior focusing spot；In this step can also directly to image carry out color and
Intensity threshold Separation；The two-dimensional matrix that value is 0 or 1 is obtained after segmenting, that is, meets laser facula color and the big Mr. Yu of brightness
It is 1 that the pixel of one threshold value, which corresponds to column locations value, is otherwise 0；
Step 2, algorithm of region growing is executed to the Threshold segmentation result of step 1, generates the regional edge of two laser faculas
Boundary；Specially：(1) detection ring region or entire image are traversed, the initial position sa for the segment for being continuously 1 is recorded per a line intermediate value
With end position ea and current line number；(2) each segment is traversed, the adjacent segment of head and the tail is labeled as same volume in not going together
Number；It refers to if a point is in the position up and down of another point wherein to close on, the two points close on, and are labeled as different volumes
Number segment then be different regions.
Step 3, geometric center point is sought in the region generated to step 2, then calculates the pixel between two geometric center points
Distance dn；
Size s=pr × tn of measured target, wherein tn are measured target shared pixel number, pr in captured image
The actual size of areas imaging is corresponded to for each pixel in image.
If laser emitter 2 uses common laser transmitter, using the center spacing dl of parallel laser light beam as measurement
Benchmark, then pr=dl/dn；
If laser emitter 2 uses parallel laser transmitter, using lasing beam diameter cd as measuring basis, if image
The a diameter of cn of hot spot pixel of upper generation, then each pixel corresponds to the actual size pr=cd/cn of areas imaging in image.
As shown in figure 5, mobile phone 13 is touch-screen mobile phone, mobile phone screen is human-computer interaction interface 10, image processing module packet
Include built in mobile phone processor and the screen surveyors' staff 11 that is arranged on human-computer interaction interface 10, processor utilize laser
The visual signature of hot spot carries out spot center extraction to the image of shooting, then calculates the two laser facula light that parallel laser generates
Pixel distance/number of pixels dn between the heart, and the center spacing dl of the parallel laser light beam sent out with parallel laser device 1 or with
The lasing beam diameter that laser emitter 2 is sent out calculates the practical ruler that each pixel in image corresponds to areas imaging as measuring basis
It is very little, then surveyed according to the ratio setting screen of the actual size of screen display size areas imaging corresponding with each pixel in image
The measurement graticule 14 of scale 11 is measured, the measurement to measured target size is finally realized according to pixel actual size, measured target
Size is shown on 10 interface of human-computer interaction interface, is directly read by measuring graticule 14 thereon.
The mobile phone external camera lens 19 of the present invention can configure the mirror of adjustable focus or different focal length according to measurement distance and precision
Long focal length lens may be used or by zoom in for distant object in head；
The crack vision measurement device overall measurement accuracy major influence factors based on parallel laser of the present invention：Laser
The depth of parallelism, lens focus, sensor devices pixel density, measurement distance；In the case where imaging device determines, measurement error is main
It is determined by parallel laser device and measurement distance.
Under double laser beam measurement pattern, if two beam angle errors are d θ, target range h, laser beam design centre
Spacing is dl, then parallel laser error is：Err=h × tan (d θ)/dl × 100%；Under single laser beam measuring pattern, if swashing
Beam divergence angle be d θ, target range h, a diameter of cd of radiating laser beams, then parallel laser error be：Err=h × tan
(d θ)/cd × 100%；The error carries out error compensation, compensation method by providing measurement distance：It is corresponding when h is accurately known
Dl or cd are accurately known, then target size measurement error caused by the depth of parallelism will be compensated for.Under single laser beam measuring pattern, swash
Optical transmitting set 2 uses height parallel laser transmitter, and measuring basis is lasing beam diameter；Under double laser beam measurement pattern, laser
It is the centre-to-centre spacing between two hot spots that transmitter 2, which uses common lasers, measuring basis,.
The present invention can be controlled or be moved up and down in measurement graticule, the measurement start-stop position for determining measured target,
In measurement process, free shift, scaling, rotation can be carried out to the image of shooting, corresponding screen measure graticule also with
The scaling of image and inclination change scale size.
The centre-to-centre spacing of hot spot caused by the parallel laser device 1 of the present invention will use other high-acruracy surveys in each distance
Means carry out manufacture calibration, in case error compensation；Parallel laser transmitter or common laser transmitting may be used in laser emitter 2
Device.Under single laser beam measuring pattern, the parallel laser transmitter of the high depth of parallelism is needed；It, can be under double laser beam measurement pattern
It is required using logical laser emitter according to measurement accuracy and measurement demand.The semi-transparent plane of parallelogram optical glass penetrates
50% laser energy, reflects 50% laser, and fully reflecting surface will transmit through 50% laser come and all reflect away.Laser Power Devices are opened
The power switch of laser emitter can be controlled by closing 9.USB interface 8 is for being powered laser using mobile phone, USB conversions
Device is OTG adapters, handset port can be switched to USB powering modes, the magnetic metal piece 20 of the cell phone back face paste is thin
Iron plate is used to parallel laser device shell being adsorbed on the mobile phone back side.
Claims (10)
1. the crack vision measurement device based on parallel laser, which is characterized in that include parallel laser device (1) and with camera shooting
The mobile phone (13) of head (18), the parallel laser device (1) cover after being detachably secured to the mobile phone (13), the mobile phone
(13) it is built-in with image processing module, the parallel laser device (1) is also electrically connected mobile phone (13).
2. according to the crack vision measurement device based on parallel laser shown in claim 1, which is characterized in that the camera
(18) plug-in camera lens (19) is also equipped on.
3. the crack vision measurement device according to claim 2 based on parallel laser, which is characterized in that described parallel sharp
Light device (1) includes shell (16), is full transparent glass at the top of the shell (16), a transmitting water is provided in the shell (16)
The direction of the laser emitter (2) of flat laser beam, the laser beam (6) emitted along laser emitter (2) is provided with parallel four side
Shape clear optical glass (3), the parallelogram clear optical glass (3) are arranged close to the one side of laser emitter (2)
There are optics semi-permeable membrane (4), one side of the parallelogram clear optical glass (3) far from laser emitter (2) to be provided with
Optical total-reflection film (5), two sides for being provided with optics semi-permeable membrane (4) and optical total-reflection film (5) are parallel and pressed from both sides with level
Angle is 45 °, and the laser beam of laser emitter (2) transmitting reflects to form two through optics semi-permeable membrane (4) and optical total-reflection film (5)
Collimated light beam (25) projects at the top of shell (16), after shell (16) bottom is detachably secured to the mobile phone (13)
It covers.
4. the crack vision measurement device according to claim 3 based on parallel laser, which is characterized in that the shell
(16) Laser Power Devices switch (9) is also equipped on, the Laser Power Devices switch (9) connects the laser emitter by conducting wire
(2), USB interface (8) is additionally provided on the mobile phone (13), USB interface (8), which is connected with, meets USB converter (21), the USB
Converter (21) passes through conducting wire and Laser Power Devices switch (9) connection.
5. the crack vision measurement device according to claim 4 based on parallel laser, which is characterized in that the mobile phone
(13) it is covered after and is fixed with magnetic metal piece (20), shell (16) bottom is fixed with strong magnets (7), the mobile phone
(13) it is fixed by the suction-combining force of magnetic metal piece (20) and strong magnets (7) with parallel laser (1).
6. the crack vision measuring method based on parallel laser, which is characterized in that parallel using being based on as claimed in claim 5
The crack vision measurement device of laser selects the plug-in camera lens (19) of proper focal length to be mounted on the camera shooting that mobile phone (13) carries first
On head (18), parallel laser device (1) is then opened, parallel laser device (1) sends out parallel laser alignment measured target, and to target
It takes pictures, then the image processing module built in mobile phone (13) carries out the image of shooting using the visual signature of laser facula
Spot center is extracted, and pixel distance/number of pixels dn between the two laser facula optical centers that parallel laser generates then is calculated, and
The center spacing dl of the parallel laser light beam sent out using parallel laser device (1) as measuring basis calculate pixel actual size or with
The lasing beam diameter that laser emitter (2) is sent out calculates pixel actual size as measuring basis, finally actually big according to pixel
Measurement of the small realization to measured target size.
7. the crack vision measuring method according to claim 6 based on parallel laser, which is characterized in that at described image
Manage module is to the specific method of the image progress spot center extraction of shooting using the visual signature of laser facula：
Step 1, laser facula position is clicked on mobile phone (13) screen, it is exactly to detect ring to determine spot detection region i.e.
(17), color and Intensity threshold Separation are carried out in detection ring (17) interior focusing spot；
Step 2, algorithm of region growing is executed to the Threshold segmentation result of step 1, generates the zone boundary of two laser faculas；
Step 3, to step 2 generate region seek geometric center point, then calculate two geometric center points between pixel distance/
Number of pixels dn.
8. the crack vision measuring method according to claim 7 based on parallel laser, which is characterized in that the tested mesh
Target size s=pr × tn, wherein tn are measured target shared pixel number in captured image, and pr is each picture in image
The actual size of the corresponding areas imaging of element.
9. the crack vision measuring method according to claim 8 based on parallel laser, which is characterized in that if Laser emission
Device (2) uses common laser transmitter, then using the center spacing dl of parallel laser light beam as measuring basis, then pr=dl/dn；
If laser emitter (2) uses parallel laser transmitter, using lasing beam diameter cd as measuring basis, if on image
The a diameter of cn of hot spot pixel of generation, then each pixel corresponds to the actual size pr=cd/cn of areas imaging in image.
10. the crack vision measuring method according to claim 9 based on parallel laser, which is characterized in that the mobile phone
(13) it is touch-screen mobile phone, mobile phone screen is human-computer interaction interface (10), and described image processing module is included in built in mobile phone
Processor and the screen surveyors' staff (11) being arranged on human-computer interaction interface (10), the processor utilize laser facula
Visual signature carries out spot center extraction to the image of shooting, between the two laser facula optical centers for then calculating parallel laser generation
Pixel distance/number of pixels (dn), and the center spacing dl of the parallel laser light beam sent out with parallel laser device (1) or to swash
The lasing beam diameter that optical transmitting set (2) is sent out calculates the practical ruler that each pixel in image corresponds to areas imaging as measuring basis
It is very little, then surveyed according to the ratio setting screen of the actual size of screen display size areas imaging corresponding with each pixel in image
The measurement graticule (14) of scale (11) is measured, the measurement to measured target size is finally realized according to pixel actual size, is tested mesh
Target size is shown on the human-computer interaction interface (10) interface, is directly read by the measurement graticule (14) being arranged thereon.
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| CN201810360469.4A CN108709502A (en) | 2018-04-20 | 2018-04-20 | Crack vision measurement device based on parallel laser and measurement method |
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Application publication date: 20181026 |