CN108151808B - A kind of steel pipe measuring device and method based on image procossing - Google Patents
A kind of steel pipe measuring device and method based on image procossing Download PDFInfo
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- CN108151808B CN108151808B CN201810019101.1A CN201810019101A CN108151808B CN 108151808 B CN108151808 B CN 108151808B CN 201810019101 A CN201810019101 A CN 201810019101A CN 108151808 B CN108151808 B CN 108151808B
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- image procossing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/12—Edge-based segmentation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/136—Segmentation; Edge detection involving thresholding
Abstract
The invention discloses a kind of steel pipe measuring device and method based on image procossing, the measuring device includes rack, Image Acquisition and processing unit, stepping transmission unit, weighing cell；The rack is used for placing steel tubes；The stepping transmission unit is for transmitting steel pipe；The weighing cell is used to measure the weight of steel pipe；Described image acquisition with processing unit be used for acquire steel pipe picture and handled as a result, acquired results include the length of the internal diameter of steel pipe, outer diameter and steel pipe.The present invention provides a kind of steel pipe measuring device and method based on image procossing, the device and method combine image procossing with commercial measurement, the internal-and external diameter and length and weight of steel pipe are measured in such a way that image procossing is combined with automation, it is easy to operate, it is versatile, with preferable real-time and accuracy, measurement efficiency can be greatly improved.
Description
Technical field
The invention belongs to technical field of industrial measurement, and in particular to a kind of steel pipe measuring device and side based on image procossing
Method.
Background technique
Steel tubular goods use very universal in daily life.In some steel pipe manufactories, to the fished pipe of production
The measurement for carrying out size and weight according to strict standard is required, the measurement result of record is analyzed convenient for subsequent promotion and produces matter
Amount and efficiency.Traditional mode is using manual measurement, and up to the present this is still many steel pipe manufactories by the way of,
This not only cumbersome but also large labor intensity that works, for different types of steel pipe, measurement difficulty is very big.Due to traditional
Measurement be easy to cause the damage of measuring device, therefore maintenance cost is higher and does not have general by the way of contact in this way
Property, need to design specific measuring system for different measurement environment.
Summary of the invention
For the above-mentioned problems in the prior art, the present invention provides a kind of, and the steel pipe based on image procossing measures dress
It sets and method, the device and method combines image procossing with commercial measurement, combined using image procossing with automation
Mode measures the internal-and external diameter and length and weight of steel pipe, easy to operate, versatile, has preferable real-time and accurate
Property, it can greatly improve measurement efficiency.
For this purpose, the invention adopts the following technical scheme:
A kind of steel pipe measuring device based on image procossing, including rack, Image Acquisition and processing unit, stepping transmission list
Member, weighing cell；The rack is used for placing steel tubes；The stepping transmission unit is for transmitting steel pipe；The weighing cell is used
In the weight of measurement steel pipe；Described image acquisition with processing unit be used for acquire steel pipe picture and handled as a result, gained
As a result the length of the internal diameter including steel pipe, outer diameter and steel pipe.
Further, described image acquisition and processing unit include camera, collimated backlight source, image processing unit, camera lens
With visual aids measuring unit；The camera is located at lower section on the left of rack, and camera is equipped with camera lens, camera lens face steel pipe left-hand end
Mouthful；The collimated backlight source is located at top on the left of rack, opposite with camera lens；Described image processing unit is connect with camera, is used for
Handle steel pipe image；Described image subsidiary unit is located at the left side of rack, is used for subsidiary steel pipe.
Further, the longitudinal axis of the rack and the placement direction of steel pipe are consistent.
Further, the stepping transmission unit includes stepper motor, conveyer belt and transmission control unit；The conveyer belt
For transmitting steel pipe, the distance of the transmission control unit record transmission, the stepper motor is used to provide the power of transmission.
Further, the weighing cell includes weighing beam and supporting plate, and the weighing beam is along stands longitudinal direction, the branch
Plate is placed in below weighing beam and plays a supportive role, for measuring the quality of steel pipe.
Further, the stepping transmission unit and weighing cell are integrated in the rack.
A kind of steel pipe measurement method based on image procossing, described image acquisition include camera, parallel back with processing unit
Light source, image processing unit, camera lens and visual aids measuring unit；Image Acquisition includes the following steps: with treatment process
Step 1, fixed camera, collimated backlight source；
Step 2 adjusts lens focus, makes picture by obscuring clearly again to fuzzy；
Step 3 adjusts the corresponding point of zoom ring that camera lens keeps picture clearest according to step 2, near corresponding points not
It is disconnected to repeat the above process, until adjusting clearest to picture；
Step 4 starts visual aids measuring unit, shoots the image in steel pipe head end face, is obtained in image by processing
Diameter r and outer diameter R1；
Step 5, stepping transmission unit transmit steel pipe, acquire the image of steel pipe pipe shaft, and processing obtains outer diameter R2、R3, and tie
Close R1Quality evaluation is done to the outer diameter of steel pipe；
Step 6 measures the weight M of steel pipe by weighing cell；
Step 7 acquires steel pipe terminal surface image, and transmitting range s and first end face figure like is combined to calculate length of steel pipe L.
Further, the face of steel pipe head end described in step 4 image processing algorithm is as follows:
Step 1: being partitioned into steel pipe target area (pixel value is compared with low spot in image) by dynamic thresholding method, f indicates acquisition
The gap picture arrived, f (i, j) indicate the i-th row j column pixel value size；Firstly, one Filtering Template of creation, template size are
MaskWidth × MaskHeight, wherein MaskWidth and MaskHeight is positive odd number, and template is to f volumes of image
Product, then divided by template size, obtains new image fmean；Choose offset Toffset, for meeting formula f (i, j) >=fmean(i,
j)+ToffsetPixel retain in f, otherwise give up；Obtain image fdyn, fdynIn there is also the influence of clutter noise, pass through
Morphologic filtering removes noise, extracts steel pipe target area picture fpipe；
Step 2: the influence of morphologic filtering removal clutter noise；
Step 3: obtaining the center point coordinate C of steel pipe target areaOriginal-center(i, j) and relative to horizontal direction
Angle αOriginal, affine transformation matrix M is created accordinglyHomMat2DRotate, fpipeWith MHomMat2DRotateDo convolution algorithm: faffine
=fgap*MHomMat2DRotate, image f after obtaining affine transformationaffine, steel pipe target area at this time is vertical with horizontal direction；
Step 4: fitting the edge of steel pipe target area based on Canny algorithm, closed edge is divided into line segment,
The calibration information of combining camera finds out a and outer diameter R1, internal diameter is shown below: r=R1-2*a。
Further, steel pipe is run on a moving belt under the action of the stepping transmission unit, in stepping transmission unit
Transmission control unit record transmission distance s, image acquisition units grab two field pictures, according to head end face image procossing
Algorithm calculates separately out outer diameter of steel pipes R2、R3, and combine R1Quality evaluation is done to the outer diameter of steel pipe.
Further, terminal surface distance calibration is calculated according to head end face image processing algorithm according to terminal surface image
The distance b of right endpoint, the calibration information of combining camera and the length that steel pipe is acquired according to the transmitting range s in stepping transmission unit
L, formula are as follows: L=s+2*W-t-b, in which: s is transmitting range, and W is the distance of calibration, end face distance calibration left end point headed by t
Distance, b be terminal surface distance calibration right endpoint distance.
Compared with prior art, the beneficial effects of the present invention are:
(1) method combined using image procossing with automation in steel pipe measurement, is improved production efficiency, reduced
The intensity of labour.
(2) measurement uses non-contacting mode, will not damage to measuring device.
(3) easy to operate, it is versatile, it is at low cost.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of steel pipe measuring device based on image procossing provided by the present invention.
Fig. 2 is steel pipe head end face figure like schematic diagram provided by the embodiment of the present invention.
Fig. 3 is steel pipe pipe shaft image schematic diagram provided by the embodiment of the present invention.
Fig. 4 is steel pipe terminal surface image schematic diagram provided by the embodiment of the present invention.
Description of symbols: 1, rack；2, camera；3, collimated backlight source；4, stepping transmission unit；5, weighing cell；6,
Image processing unit；7, camera lens；8, visual aids measuring unit.
Specific embodiment
With reference to the accompanying drawing and specific embodiment come the present invention will be described in detail, specific embodiment therein and explanation only
For explaining the present invention, but it is not as a limitation of the invention.
As shown in Figure 1, the invention discloses a kind of steel pipe measuring device based on image procossing, including rack 1, image are adopted
Collection and processing unit, stepping transmission unit 4, weighing cell 5；The rack 1 is used for placing steel tubes；The stepping transmission unit 4
For transmitting steel pipe；The weighing cell 5 is used to measure the weight of steel pipe；Described image acquisition is with processing unit for acquiring steel
Pipe picture and handled as a result, acquired results include the length of the internal diameter of steel pipe, outer diameter and steel pipe.
Described image acquisition and processing unit include camera 2, collimated backlight source 3, image processing unit 6, camera lens 7 and image
Subsidiary unit 8；The camera 2 is located at 1 left side lower section of rack, and camera 2 is equipped with camera lens 7,7 face steel pipe left-hand end of camera lens
Mouthful；The collimated backlight source 3 is located at 1 left side top of rack, opposite with camera lens 7；Described image processing unit 6 is connect with camera 2,
For handling steel pipe image；Described image subsidiary unit 8 is located at the left side of rack 1, is used for subsidiary steel pipe.The machine
The longitudinal axis of frame 1 and the placement direction of steel pipe are consistent.
The stepping transmission unit 4 includes stepper motor, conveyer belt and transmission control unit；The conveyer belt is for transmitting
Steel pipe, the distance of the transmission control unit record transmission, the stepper motor are used to provide the power of transmission.The check weighing list
Member 5 includes weighing beam and supporting plate, and for the weighing beam along stands longitudinal direction, the supporting plate, which is placed in below weighing beam, plays support work
With for measuring the quality of steel pipe.The stepping transmission unit 4 and weighing cell 5 are integrated in the rack 1.
Fig. 2 show the first end face figure like of the embodiment of the present invention, it is obtained by image acquisition units, during acquisition
Fixed camera 2, collimated backlight source 3；7 focal length of camera lens is adjusted, makes picture by obscuring clearly again to fuzzy；According to adjusting camera lens 7
The corresponding point of the zoom ring for keeping picture clearest, constantly repeats the above process near corresponding points, until adjusting most clear to picture
It is clear, call image subsidiary unit 8 that auxiliary rod is placed in steel pipe, as shown in Figure 2.Visual field width W in Fig. 2 is corresponding solid
Fixed length (distance of calibration) is as follows for the head end face image procossing of shooting:
Step 1: being partitioned into steel pipe target area (pixel value is compared with low spot in image) by dynamic thresholding method, f indicates acquisition
The gap picture arrived, f (i, j) indicate the i-th row j column pixel value size；Firstly, one Filtering Template of creation, template size are
MaskWidth × MaskHeight, wherein MaskWidth and MaskHeight is positive odd number, and template is to f volumes of image
Product, then divided by template size, obtains new image fmean；Choose offset Toffset, for meeting formula f (i, j) >=fmean(i,
j)+ToffsetPixel retain in f, otherwise give up；Obtain image fdyn, fdynIn there is also the influence of clutter noise, pass through
Morphologic filtering removes noise, extracts steel pipe target area picture fpipe；
Step 2: the influence of morphologic filtering removal clutter noise；
Step 3: obtaining the center point coordinate C of steel pipe target areaOriginal-center(i, j) and relative to horizontal direction
Angle αOriginal, affine transformation matrix M is created accordinglyHomMat2DRotate, fpipeWith MHomMat2DRotateDo convolution algorithm: faffine
=fgap*MHomMat2DRotate, image f after obtaining affine transformationaffine, steel pipe target area at this time is vertical with horizontal direction；
Step 4: fitting the edge of steel pipe target area based on Canny algorithm, closed edge is divided into line segment,
The calibration information of combining camera finds out a and outer diameter R1, internal diameter is shown below: r=R1-2*a。
Fig. 3 show the steel pipe pipe shaft image of the embodiment of the present invention, and steel pipe is transmitting under the action of stepping transmission unit 4
Operation is taken, the distance s of the transmission control unit record transmission in stepping transmission unit 4, image acquisition units grab two frame figures
Picture calculates separately out outer diameter of steel pipes R according to the image processing algorithm in Fig. 22、R3, and combine R1Quality is done to the outer diameter of steel pipe to comment
Valence.Weighing cell 5 measures the mass M of steel pipe in the process.
Fig. 4 show the terminal surface image of the embodiment of the present invention, and the value of b is calculated according to the image processing algorithm in Fig. 2,
The calibration information of combining camera simultaneously can obtain length of steel pipe L according to the transmitting range s in stepping transmission unit 4 and be shown below: L=
S+2*W-t-b, in which: s is transmitting range, and W is the distance of calibration, and the distance of end face distance calibration left end point headed by t, b is end
The distance of end face distance calibration right endpoint.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to restrict the invention, all in essence of the invention
Made any modification, equivalent replacement and improvement etc., should be included in protection scope of the present invention within mind and spirit
Within.
Claims (9)
1. a kind of steel pipe measuring device based on image procossing, including rack (1), Image Acquisition and processing unit, stepping transmission
Unit (4), weighing cell (5), it is characterised in that: the rack (1) is used for placing steel tubes；The stepping transmission unit (4) is used
In transmission steel pipe；The weighing cell (5) is used to measure the weight of steel pipe；Described image acquisition is with processing unit for acquiring steel
Pipe picture and handled as a result, acquired results include the length of the internal diameter of steel pipe, outer diameter and steel pipe；
Described image acquisition with processing unit include camera (2), collimated backlight source (3), image processing unit (6), camera lens (7) and
Visual aids measuring unit (8)；The camera (2) is located at lower section on the left of rack (1), and camera (2) is equipped with camera lens (7), camera lens
(7) port on the left of face steel pipe；The collimated backlight source (3) is located at top on the left of rack (1), opposite with camera lens (7)；The figure
Picture processing unit (6) is connect with camera (2), for handling steel pipe image；Described image subsidiary unit (8) is located at rack
(1) left side is used for subsidiary steel pipe；Described image subsidiary unit (8) be auxiliary rod and with steel pipe inner wall side phase
Fitting.
2. a kind of steel pipe measuring device based on image procossing according to claim 1, it is characterised in that: the rack
(1) longitudinal axis is consistent with the placement direction of steel pipe.
3. a kind of steel pipe measuring device based on image procossing according to claim 2, it is characterised in that: the stepping passes
Sending unit (4) includes stepper motor, conveyer belt and transmission control unit；The conveyer belt is for transmitting steel pipe, the transmission control
The distance of unit record transmission processed, the stepper motor are used to provide the power of transmission.
4. a kind of steel pipe measuring device based on image procossing according to claim 3, it is characterised in that: the check weighing list
First (5) include weighing beam and supporting plate, and for the weighing beam along stands longitudinal direction, the supporting plate, which is placed in below weighing beam, plays support work
With for measuring the quality of steel pipe.
5. a kind of steel pipe measuring device based on image procossing according to claim 4, it is characterised in that: the stepping passes
Unit (4) and weighing cell (5) is sent to be integrated on the rack (1).
6. a kind of steel pipe based on image procossing using the steel pipe measuring device based on image procossing as described in claim 1
Measurement method, it is characterised in that: Image Acquisition includes the following steps: with treatment process
Step 1, fixed camera (2), collimated backlight source (3)；
Step 2 adjusts camera lens (7) focal length, makes picture by obscuring clearly again to fuzzy；
Step 3 adjusts the corresponding point of zoom ring that camera lens (7) keep picture clearest according to step 2, continuous near corresponding points
It repeats the above process, until adjusting clearest to picture；
Step 4 starts visual aids measuring unit (8), shoots the image in steel pipe head end face, is obtained in image by processing
Diameter r and outer diameter R1；
Step 5, stepping transmission unit (4) transmit steel pipe, acquire the image of steel pipe pipe shaft, and processing obtains outer diameter R2、R3, and combine
R1Quality evaluation is done to the outer diameter of steel pipe；
Step 6 measures the weight M of steel pipe by weighing cell (5)；
Step 7 acquires steel pipe terminal surface image, and transmitting range s and first end face figure like is combined to calculate length of steel pipe L.
7. a kind of steel pipe measurement method based on image procossing according to claim 6, it is characterised in that: institute in step 4
It is as follows to state steel pipe head end face image processing algorithm:
Step 1: being partitioned into steel pipe target area by dynamic thresholding method, i.e., pixel value is collected compared with low spot, f expression in image
Gap picture, f (i, j) indicate the i-th row j column pixel value size；Firstly, one Filtering Template of creation, template size are
MaskWidth × MaskHeight, wherein MaskWidth and MaskHeight is positive odd number, and template is to f volumes of image
Product, then divided by template size, obtains new image fmean；Choose offset Toffset, for meeting formula f (i, j) >=fmean(i,
j)+ToffsetPixel retain in f, otherwise give up；Obtain image fdyn, fdynIn there is also the influence of clutter noise, pass through
Morphologic filtering removes noise, extracts steel pipe target area picture fpipe；
Step 2: the influence of morphologic filtering removal clutter noise；
Step 3: obtaining the center point coordinate C of steel pipe target areaOriginal-center(i, j) and folder relative to horizontal direction
Angle αOriginal, affine transformation matrix M is created accordinglyHomMat2DRotate, fpipeWith MHomMat2DRotateDo convolution algorithm: faffine=
fgap*MHomMat2DRotate, image f after obtaining affine transformationaffine, steel pipe target area at this time is vertical with horizontal direction；
Step 4: fitting the edge of steel pipe target area based on Canny algorithm, closed edge is divided into line segment, in conjunction with
The calibration information of camera finds out a and outer diameter R1, internal diameter is shown below: r=R1-2*a；Wherein a is the thickness of steel pipe.
8. a kind of steel pipe measurement method based on image procossing according to claim 7, it is characterised in that: steel pipe is described
Stepping transmission unit is run on a moving belt under the action of (4), and the transmission control unit in stepping transmission unit (4) records transmission
Distance s, image acquisition units grab two field pictures, calculate separately out outer diameter of steel pipes according to head end face image processing algorithm
R2、R3, and combine R1Quality evaluation is done to the outer diameter of steel pipe.
9. a kind of steel pipe measurement method based on image procossing according to claim 8, it is characterised in that: according to terminal surface
Image calculates the distance b of terminal surface distance calibration right endpoint according to head end face image processing algorithm, combining camera (2)
Calibration information and the length L that steel pipe is acquired according to the transmitting range s in stepping transmission unit (4), formula are as follows: L=s+2*W-t-
B, in which: s is transmitting range, and W is the distance of calibration, and the distance of end face distance calibration left end point headed by t, b is terminal surface distance
Demarcate the distance of right endpoint.
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| CN201810019101.1A CN108151808B (en) | 2018-01-09 | 2018-01-09 | A kind of steel pipe measuring device and method based on image procossing |
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| CN112037195B (en) * | 2020-08-31 | 2023-04-07 | 中冶赛迪信息技术(重庆)有限公司 | Method, system, equipment and medium for detecting abnormal length of bar |
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