CN206114545U - Singly take photograph wide visual field of camera vision thread detection device - Google Patents
Singly take photograph wide visual field of camera vision thread detection device Download PDFInfo
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- CN206114545U CN206114545U CN201621013960.2U CN201621013960U CN206114545U CN 206114545 U CN206114545 U CN 206114545U CN 201621013960 U CN201621013960 U CN 201621013960U CN 206114545 U CN206114545 U CN 206114545U
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Abstract
The utility model belongs to a singly take photograph wide visual field of camera vision thread detection device in thread detection technical research field, including singly taking the photograph the wide visual field vision sensor of camera, platform, image acquisition card and computer, singly take the photograph the wide visual field vision sensor of camera including taking the photograph camera, upper portion speculum group, lower part speculum group, metal pole and LED ring illuminator, it arranges in perpendicularly to take screwed to wait to detect the fastener under singly taking the photograph the wide visual field vision sensor of camera, just put for platform's central point, image acquisition card installs in the computer, and with singly take the photograph and take the photograph that the cable links to each other for the camera among the wide visual field vision sensor of camera, utilize the computer is right the image that image acquisition card gathered carries out image analysis, realizes the detection of fastener thread defect.
Description
Technical field
This utility model belongs to thread measurement technical field of research, and in particular to a kind of single camera wide visual field vision screw thread
Detection means.
Background technology
Securing member is widely used in the manufacturings such as machinery, automobile, aircraft as a kind of conventional machinery part.Securing member
Threading defects can directly affect its performance, cause various potential safety hazards, it is necessary to the individual of existing defects was rejected before input application
Body, it is to avoid cause unforeseen consequence.It is domestic at present also to rest on artificial visual detection-phase for fastener threads are detected,
Not only inefficiency, and easily there is flase drop and missing inspection.As manufacturing industry is towards high speed, high-volume, automatic mode
Transformation, conventional fastener thread measurement technology cannot meet modern industry Production requirement, in the urgent need to research and development are a kind of efficiently,
The fastener threads detection technique of low cost.
Utility model content
The purpose of this utility model is, for the above-mentioned deficiency of existing fastener threads detection technique, proposes a kind of single
Video camera wide visual field vision thread detecting device, for the detection of fastener threads defect, to improve detection efficiency.
The technical solution of the utility model is：A kind of single camera wide visual field vision thread detecting device, including single shooting
Machine width visual field vision sensor 6, object disposing platform 7, image pick-up card 8 and computer 9；
The single camera wide visual field vision sensor 6 include video camera 1, upper mirror group 2, bottom speculum group 3,
Metallic rod 4 and LED annular light sources 5；The upper mirror group 2 and bottom speculum group 3 are mutually perpendicular to place, and in both
The heart becomes an entirety on same vertical line with three fixations of metallic rods 4；The LED annular light sources 5 be fixed on it is described under
Immediately below portion's speculum group 3, and blocked by the bottom speculum group 3, itself will not be imaged in the video camera 1；Institute
State video camera 1 to be disposed vertically directly over upper mirror group 2, and just to cover the lower flat anti-for camera lens visual field
Penetrate microscope group 3；Screwed securing member to be detected 10 is vertically arranged in immediately below the single camera wide visual field vision sensor 6,
And for the center of object disposing platform 7；Described image capture card 8 is installed in computer 9, and is electrically connected with the video camera 1,
The computer 9 carries out graphical analyses to the image that described image capture card 8 is collected, and detects the defect of fastener threads.
In such scheme, the upper mirror group 2 is made up of six plate shape identical isosceles trapezoid plane mirrors, and two-by-two
It is connected and surrounds hollow positive six terrace with edge, its reflecting surface is the inner surface of hollow positive six terrace with edge.
In such scheme, the bottom speculum group 3 is also made up of six plate shape identical isosceles trapezoid plane mirrors, with institute
The ratio for stating the isosceles trapezoid plane mirror correspondence length of side in upper mirror group 2 is 1:3, and also two-by-two be connected surround one it is little
Hollow positive six terrace with edge, but reflecting surface is little hollow positive six terrace with edges outer surface.
In such scheme, the single camera wide visual field refers to that shooting piece image merely with a video camera can obtain
The 360 degrees omnidirection image and top end surface image of the thread surface of securing member to be detected 10, wherein with 60 degree as interval
360 degrees omnidirection screw image is presented on into respectively six zoness of different of the single image and a regular hexagon is surrounded；Institute
State the top end surface image of securing member to be detected 10 and be then presented on the orthohexagonal center, its region shape be also one just
Hexagon.
In such scheme, the vision thread measurement refers to that described image capture card 8 passes through the single camera wide visual field
Vision sensor 5 gathers the wide visual field image of a securing member to be detected 10, and using the computer 9 graphical analyses are carried out, real
The detection of existing fastener threads defect.
This utility model advantage compared with prior art is：
1st, using upper mirror group and bottom speculum group combine it is integral by the way of, reduce single camera wide visual field
Vision sensor requisite space, its speculum group also can be scaled, to realize the miniaturization of wide visual field vision sensor, micro-
Type.
2nd, using upper mirror group and bottom speculum group adjustment light path, single camera wide visual field vision sensor can be made
Detecting distance between testee reduces, while single camera wide visual field vision sensor only shoots piece image just can adopt
Collect 360 degree of sides and the top image of fastener threads to be detected, substantially reduce detection time, improve the effect of thread measurement
Rate.
3rd, single camera wide visual field vision sensor is built using plane mirror, and expands field range not using curved mirror
Together, which shoots gained image without curling effect, with perspective projection invariance, facilitates the work such as follow-up calibration,
So that whole detection process can both carry out the threading defects detection of accurate measurement mode, the screw thread of recognition method is also capable of achieving
Defects detection.
4th, single camera wide visual field vision sensor can form six groups of virtual tri-item stereo vision systems, realize 360 degree of models
The measurement enclosed；Images match difficulty can be effectively reduced, matching precision is improved, while measuring system can be improved using redundant data
Precision.
5th, whole structure of the detecting device is simple, it is easy to which processing and manufacturing, cost is relatively low, and both can be real without the need for any rotating mechanism
The comprehensive detection of existing fastener threads, detection efficiency is high.
Description of the drawings
Fig. 1 is the apparatus structure schematic diagram of the embodiment of this utility model one；
Fig. 2 is the wide visual field image schematic diagram that the embodiment of this utility model one is collected.
In figure, 1, video camera；2nd, upper mirror group；3rd, bottom speculum group；4th, metallic rod；5th, LED annular light sources；6、
Single camera wide visual field vision sensor；7th, object disposing platform；8th, image pick-up card；9th, computer；10th, securing member to be detected；11、
Wide visual field image；12nd, securing member side image region；13rd, fastener tip image-region.
Specific embodiment
This utility model is described in further detail with reference to the accompanying drawings and detailed description, but it is of the present utility model
Protection domain is not limited to this.
Fig. 1 show a kind of embodiment of single camera wide visual field vision thread detecting device described in the utility model,
The single camera wide visual field vision thread detecting device includes single camera wide visual field vision sensor 6, object disposing platform 7, figure
As capture card 8 and computer 9.
The single camera wide visual field vision sensor 6 include video camera 1, upper mirror group 2, bottom speculum group 3,
Metallic rod 4 and LED annular light sources 5.The upper mirror group 2 and bottom speculum group 3 are mutually perpendicular to place, and in both
The heart becomes an entirety on same vertical line with three fixations of metallic rods 4；The LED annular light sources 5 be fixed on it is described under
Immediately below portion's speculum group 3, and blocked by the bottom speculum group 3, itself will not be imaged in the video camera 1；Institute
State video camera 1 to be disposed vertically directly over upper mirror group 2, and just to cover the lower flat anti-for camera lens visual field
Penetrate microscope group 3.
Wherein upper mirror group 2 refers to the plane microscope group being made up of hexahedro identical plane mirror, is all per facial plane mirror
120 degree of upper drift angle, the isosceles trapezoid shape at 60 degree of lower base angle.It is connected with each other with hypotenuse per facial plane mirror；And bottom speculum group 3 is
Reduced by dimension scale by upper mirror group and constituted, diminution ratio is about 1:3；Metallic rod 4 can carry out length regulation so that on
The distance of portion's speculum group 2 and bottom speculum group 3 is optimal.Screwed securing member to be detected 10 is vertically arranged in described
Immediately below single camera wide visual field vision sensor 6, and for the center of object disposing platform 7；Described image capture card 8 is installed on
In computer 9, and it is connected with cable with video camera 1 in the single camera wide visual field vision sensor 6.
The single camera wide visual field refers to that shooting piece image merely with a video camera can obtain described to be detected
The 360 degrees omnidirection image and top end surface image of the thread surface of securing member 10, wherein complete square by 360 degree with 60 degree as interval
Position screw image is presented on respectively six zoness of different of the single image and surrounds a regular hexagon；The fastening to be detected
The top end surface image of part 10 is then presented on the orthohexagonal center, and its region shape is also a regular hexagon.
The vision thread measurement refers to that described image capture card 8 passes through the single camera wide visual field vision sensor 5
The wide visual field image of one securing member to be detected 10 of collection, using the computer 9 graphical analyses are carried out, and realize fastener threads
The detection of defect.
Fastener threads detection is carried out using single camera wide visual field vision thread detecting device as above, its detection
Method includes image acquisition phase and graphical analyses stage, often carries out directly carrying out graphical analyses inspection after an image acquisition
Survey, comprise the following steps that:
Step one, image acquisition phase,
Open LED annular light sources 5 and adjust the light luminance and light source colour of light source, it is ensured that source light it is bright it is suitable,
Color after having adjusted, keeps the variables such as backlight source position, brightness, color constant camera imaging optimal quality.The present embodiment is adopted
Use blue-light source.
The outer-hexagonal bolt of model M10X40 is disposed vertically and is put down in glove by the present embodiment as securing member to be detected 10
The center of platform 7, it is ensured that the securing member is immediately below the central area of LED annular light sources 5 so as to institute's by uniform illumination, bright
Degree is suitable, while ensureing that securing member to be detected 10, in the optical axis center of single camera wide visual field vision sensor 6, makes video camera 1
The screw image light and shade that collects is moderate, suitable size, texture are uniform.The blue ray of the projection of LED annular light sources 5 is projected to be treated
On detection securing member 10, the screw image of securing member to be detected 10 reflexes to first upper mirror group 2, then reflects via bottom
Microscope group 3 is received after reflecting by video camera 1.For ccd video camera, maximum pixel is 1628X1236 to the video camera 1 that the present embodiment is adopted
Pixel.Image pick-up card 8 gathers the wide visual field figure of a securing member to be detected 10 by single camera wide visual field vision sensor 6
Picture, and it is transferred to computer 9.
Step 2, graphical analyses stage, the single width wide visual field image that computer 9 is collected to image pick-up card 8 is (such as Fig. 2
It is shown) detection of fastener threads defect is carried out, detect including the threading defects for both carrying out accurate measurement mode, it is also carried out identification
The threading defects detection of mode.
The threading defects detection of the accurate measurement mode is concretely comprised the following steps：
Step one, transducer calibration, obtain inner parameter and the outside of the single camera wide visual field vision sensor 6
Parameter；Inner parameter only needs to demarcate single camera, this calibration of camera process with a usual camera apparatus
It is completely the same.During calibrating external parameters, the single camera wide visual field vision sensor 6 can be regarded as between six virtual video cameras etc.
Every circular placement is surrounded, tri-item stereo vision is formed per adjacent three virtual video cameras, six group of three mesh stereopsis is thus formed altogether
Feel system, the calibration process of tri-item stereo vision its exterior parameter can be found in Ma Zengting et al. works《Trinocular vision measuring system
Modeling analysis》, infrared and laser engineering, 2010, supplementary issue (39)：619-624.
Step 2, region cutting, by fastener threads one week, totally six pieces of side image regions 12 gathered from image pick-up card 8
To single width wide visual field image 11 in cut out, and the original image region of isosceles trapezoid is trimmed to into rectangular image block, square
The a line of shape is isosceles trapezoid upper bottom edge, and the another a line of rectangle is the height of isosceles trapezoid, using three pieces of adjacent figures of position
As constituting tri-item stereo vision.
Step 3, pitch measurement, measure what six groups of virtual tri-item stereo visions were covered using tri-item stereo vision principle
The pitch of the screw thread of securing member to be detected 10 in the range of 360 degree.
Step 4, defect estimation, the pitch data measured and normal data are compared, and discriminate whether to be missed beyond permission
Difference scope, if exceeding allowable error scope, judges that screw thread is defective, otherwise as screw thread zero defect.
The threading defects detection of the recognition method is concretely comprised the following steps：
Step one, region cutting, by fastener threads one week totally six pieces of side image regions 12 and one piece of top image
Cut out in the single width wide visual field image 11 that region 13 collects from image pick-up card 8, and by the original side of isosceles trapezoid
Image-region is trimmed to rectangular image block, and a line of rectangle is isosceles trapezoid upper bottom edge, and the another a line of rectangle is isosceles ladder
The height of shape；Regular hexagon original top image block is trimmed to most imperial palace and connects square image blocks.
Step 2, smothing filtering, all seven pieces of image blocks to cutting out carry out Gaussian smoothing filter.
Step 3, Threshold segmentation, are entered to all seven pieces of area images after Gaussian smoothing filter using maximum variance between clusters
Row threshold division, obtains binary image.
Step 4, defect estimation, upright projection is carried out respectively to binary image, and specially image is with all in a line
Pixel value addition, and floor projection, all pixels value addition specially in image same row, gained drop shadow curve waveform and nothing
The standard curve waveform of defect compares, the screw thread zero defect if waveform shape is consistent, the spiral shell if waveform shape occurs difference
Stricture of vagina is defective.
It should be understood that, although this specification is described according to each embodiment, but not each embodiment only includes one
Individual independent technical scheme, this narrating mode of description is only that for clarity those skilled in the art will should say
Bright book as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, forming those skilled in the art can be with
The other embodiment of understanding.
The a series of detailed description of those listed above is only for the concrete of possible embodiments of the present utility model
Illustrate, they are simultaneously not used to limit protection domain of the present utility model, it is all without departing from this utility model skill spirit made etc.
Effect embodiment or change should be included within protection domain of the present utility model.
Claims (5)
1. a kind of single camera wide visual field vision thread detecting device, it is characterised in that pass including single camera wide visual field vision
Sensor (6), object disposing platform (7), image pick-up card (8) and computer (9)；
The single camera wide visual field vision sensor (6) includes video camera (1), upper mirror group (2), bottom speculum group
(3), metallic rod (4) and LED annular light sources (5)；The upper mirror group (2) and bottom speculum group (3) are mutually perpendicular to put
Put, and both centers are on same vertical line, and become an entirety with three metallic rod (4) fixations；The LED ring lights
Source (5) is fixed on immediately below the bottom speculum group (3), and is blocked by the bottom speculum group (3), and itself will not be into
As in the video camera (1)；The video camera (1) is disposed vertically directly over upper mirror group (2), and camera lens
Visual field just covers the lower flat speculum group (3)；Screwed securing member to be detected (10) is vertically arranged in the list
Immediately below video camera wide visual field vision sensor (6), and for the center of object disposing platform (7)；Described image capture card (8) is pacified
It is interior loaded on computer (9), and electrically connect with the video camera (1), the computer (9) gathers to described image capture card (8)
To image carry out graphical analyses, detect the defect of fastener threads.
2. a kind of single camera wide visual field vision thread detecting device according to claim 1, it is characterised in that on described
Portion's speculum group (2) is made up of six plate shape identical isosceles trapezoid plane mirrors, and two-by-two be connected surround hollow positive six rib
Platform, its reflecting surface is the inner surface of hollow positive six terrace with edge.
3. a kind of single camera wide visual field vision thread detecting device according to claim 1, it is characterised in that under described
Portion's speculum group (3) is also made up of six plate shape identical isosceles trapezoid plane mirrors, with the upper mirror group (2) in etc.
The ratio of the waist ladder plane mirror correspondence length of side is 1:3, and also two-by-two be connected surround little hollow positive six terrace with edge, but reflecting surface
For little hollow positive six terrace with edges outer surface.
4. a kind of single camera wide visual field vision thread detecting device according to claim 1, it is characterised in that the list
Video camera wide visual field refers to that shooting piece image merely with a video camera can obtain securing member to be detected (10) surface
The 360 degrees omnidirection image and top end surface image of screw thread, wherein being divided 360 degrees omnidirection screw image with 60 degree as interval
It is not presented on six zoness of different of the single image and surrounds a regular hexagon；Securing member to be detected (10) top table
Face image is then presented on the orthohexagonal center, and its region shape is also a regular hexagon.
5. a kind of single camera wide visual field vision thread detecting device according to claim 1, it is characterised in that described to regard
Feel that thread measurement refers to that described image capture card (8) gathers a width and treats by the single camera wide visual field vision sensor (6)
The wide visual field image of detection securing member (10), using the computer (9) graphical analyses are carried out, and realize fastener threads defect
Detection.
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| CN201621013960.2U CN206114545U (en) | 2016-08-31 | 2016-08-31 | Singly take photograph wide visual field of camera vision thread detection device |
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| CN201621013960.2U CN206114545U (en) | 2016-08-31 | 2016-08-31 | Singly take photograph wide visual field of camera vision thread detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226316A (en) * | 2016-08-31 | 2016-12-14 | 江苏大学 | A kind of single camera wide visual field vision thread detecting device and detection method thereof |
| CN114112903A (en) * | 2021-02-01 | 2022-03-01 | 苏州威华智能装备有限公司 | Method and device for detecting surface defects of photovoltaic cell and storage medium |
-
2016
- 2016-08-31 CN CN201621013960.2U patent/CN206114545U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226316A (en) * | 2016-08-31 | 2016-12-14 | 江苏大学 | A kind of single camera wide visual field vision thread detecting device and detection method thereof |
| CN114112903A (en) * | 2021-02-01 | 2022-03-01 | 苏州威华智能装备有限公司 | Method and device for detecting surface defects of photovoltaic cell and storage medium |
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| TR01 | Transfer of patent right |
Effective date of registration: 20230118 Address after: 212028 No. 106, Ruishan East Road, Dantu New District, Zhenjiang City, Jiangsu Province Patentee after: JIANGSU RUNMO AUTOMOTIVE INSEPECTION EQUIPMENT CO.,LTD. Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: JIANGSU University |