CN105890531A - Precision communication relay contact spacing detection method based on sensor imaging system - Google Patents
Precision communication relay contact spacing detection method based on sensor imaging system Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 39
- 238000003384 imaging method Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000005286 illumination Methods 0.000 claims abstract description 7
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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
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
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Abstract
The invention discloses a precision communication relay contact spacing detection method based on a sensor imaging system. The precision communication relay contact spacing detection method comprises the following steps: determining system resolution and imaging system parameters according to the requirement of communication relay contact spacing measurement accuracy; selecting a light source and determining an illumination mode according to specific parameters of a spectral response curve of a CDD imaging system and light scattering ability corresponding to light wavelength; shielding a high-frequency part of an acquired communication relay image, and smoothening the image by using an improved selective cross mask method; and performing edge detection on the smoothened image by using an improved cross structured element expanding corrosion method, and finally, performing high frequency enhancement on the image according to the detected edge, and measuring the contact spacing. The precision communication relay contact spacing detection method disclosed by the invention is high in efficiency, low in cost and high in real-time property, measurement accuracy and reliability.
Description
Technical field
The present invention relates to electrical equipment intelligent testing technology field, a kind of accurate communication relay based on sensing imaging system
Contact spacing detection method.
Background technology
The rise of mobile communication, computer network, fiber optic communication etc. is greatly promoted the development of communication industry, believes the swift and violent of industry
Development makes communication relay have many great changes and development at aspects such as technology, design, manufacturing process and materials.
Fast-developing communication technology proposes more harsher requirement to relay, and the space of such as installing plate constantly reduces, little
Type is the inexorable trend that each manufacturer faces.So owing to communication relay product is low in energy consumption, volume is little, compact conformation etc.
Feature, this just proposes the highest requirement to the precision of parts, technical target of the product measurement etc..If it is known that dress
Join precision the highest, can largely reduce low resistance performance under the contact pressure of communication relay, closure state, release shape
Insulating properties etc. under state.Emphasis and difficult point during communication relay production and manufacture are the essence of the assembling to contact part
Degree controls, and therefore in communication relay quality testing link, needs the assembly precision to its contact part to carry out many index
Strict detection.Wherein, the spacing of relay contact is exactly the Testing index that one of which is important.In other words, communication continues
The reliability improving communication relay product is had the heaviest by the research of appliance contact spacing parameter intelligence accurate detecting method
The meaning wanted.
Summary of the invention
The technical problem to be solved is, not enough for prior art, it is provided that a kind of essence based on sensing imaging system
Close communication relay contact spacing detection method.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of precision based on sensing imaging system is led to
Distance detecting method between letter relay contact, comprises the following steps:
1) require to determine systemic resolution and imaging system parameters according to communication relay contact spacing certainty of measurement；
2) design parameter and wavelength of light correspondence light scattering ability according to the spectral response curve of imaging system carry out light source
Selection, determine illumination mode；
3), after the communication relay image HFS shielding that will gather, use the selecting type cross mask means improved to figure
As smoothing；
4) image after smoothing uses improvement cross structure element dilation erosion method to carry out rim detection；
5) according to the edge of detection, image carried out metering contact spacing after high frequency enhancement.
Determine that imaging system parameters is as follows: resolution 2000*1500 photosensitive unit, photosensitive size 4.0*4.0um2, photosensitive list
Unit effective sensitization area 10*10mm2。
Step 3) the process that implements include: choose 5*5 window, in the window with pixel f (x, y) on the basis of point, system
Make 9 cross masks, then to pixel (x, 9 cross neighborhoods y) ask variance computing, find the neighborhood that variance is minimum,
Seek each point gray scale frequency in the picture in this neighborhood, be converted into the weighter factor of corresponding 9 cross masks, obtain weighting all
Value, weighted mean is assigned to pixel f (x, y).
Step 4) the process that implements include: will smooth after image be divided into the sub-block of several 20*20, in
4*4 center square is chosen in heart position, about 2 4*2 rectangular sub blocks, about 2 2*4 rectangular sub blocks are combined into one ten
Word structural element；Then this cross structure element is expanded, become a 6*6 centered by described cross structure element
Center square, about 2 6*2 rectangular sub blocks, about 2 2*6 rectangular sub blocks are combined into new expansion cross, then will
Cross structure element, new expansion cross subtract each other, it is thus achieved that edge, are repeated a number of times until the sub-block of all images all completes
This kind of dilation erosion, it is thus achieved that the edge of general image.
Compared with prior art, the had the beneficial effect that present invention of the present invention makes full use of sensing imaging system and has survey
Amount belongs to contactless, have wide spectral response range, be greatly improved communication relay detect quality and efficiency, can be quick
Accurately acquisition information, possess the advantages such as automatic business processing, the information that is prone to is integrated, it is provided that between a kind of new communication relay contact
Distance detecting method, the method efficiency is high, low cost, and real-time is good, and certainty of measurement is high, good reliability.
Accompanying drawing explanation
Fig. 1 is the spectral response curve of matrix CCD of the present invention；
Fig. 2 is that the ring light of the present invention is according to schematic diagram；
Fig. 3 is the selectivity cross mask schematic diagram that the present invention improves；
Fig. 4 (a) is the cross element structure dilation erosion original image that the present invention improves；Fig. 4 (b) is ten that the present invention improves
Character table structure dilation erosion expansion plans picture；Fig. 4 (c) is the cross element structure dilation erosion image that the present invention improves；
The original image of Fig. 5 (a) present invention experiment；The spacing testing result of Fig. 5 (b) present invention experiment；
Wherein, 1: camera；2: camera lens；3: annular light source；4: measured object.
Detailed description of the invention
Accurate communication relay contact spacing detection method based on sensing imaging system, including following several steps:
(1) require to determine systemic resolution and imaging system parameters according to communication relay contact spacing certainty of measurement
Communication relay contact spacing measurement is typically to need two dimensional image imaging.Line array CCD need to coordinate with vertical sense
The scanning motion of light unit array, due to scanning motion, line array CCD produces displacement s when imaging along scanning direction, causes
Imaging area S corresponding to single photosensitive unit becomes big, and imaging time t and scanning motion speed v meet following relation: s=vt；
S=l2+ lvt, l here represent the length of testee corresponding on photosensitive unit vertical scanning direction.Continue in view of communication
Appliance contact spacing is the least, but the requirement for certainty of measurement is the highest, then be necessary for arranging scanning motion speed
The lowest, thus affect the stability of resolution, affect certainty of measurement, then line array CCD scheme is not suitable as present aspect
High precision measuring system.So the present invention selects area array CCD imaging system.For typical communication relay,
Its contact spacing is small, then the required certainty of measurement realized of detecting system requires more than 10 microns (um).Consider to measure
The nargin of precision, the certainty of measurement choosing 5um is more reasonable, then the survey of charge coupled cell (CCD) imaging system
Accuracy of measurement should be 2 times of its system resolution road, i.e. systemic resolution should be 2.5um.It is then determined that CCD imaging system
System parameter is as follows: resolution 2000*1500 photosensitive unit, photosensitive size 4.0*4.0um2, unit, effective sensitization area
10*10mm2(mm is millimeter).Use this area array CCD, under 2.5um resolution, testing requirement can be met.
(2) design parameter and wavelength of light correspondence light scattering ability according to the spectral response curve of CDD imaging system enter
The selection of line light source and determine illumination mode
The high-acruracy survey of the communication relay contact spacing of requirement to be reached, if environment light source is unstable, may result in institute
The image intensity collected is unstable, but stable signal intensity is the basis that successive image processes and analyzes；It addition, such as
Really the interference of the ambient light in spacing detecting system is too much, and the picture noise that can directly affect system acquisition is excessive, is unfavorable for figure
The subsequent treatment of picture, therefore, the design of luminous source system is necessary, and suitable light-source illuminating system is to improve target area
Territory and the key of background area contrast.The purpose of design luminous source system is that raising target area is relative with background area
Contrast, light source is that it first has to consider.According to following knowledge: the photosensitive unit of (a) CCD is for the light of different wave length
The responding ability of line is different (Fig. 1)；B () is according to Rayleigh's law: " line diminishes in the microgranule of wavelength of light, to incidence
The rule that light scattering is followed is: scattered light is identical with lambda1-wavelength, and the intensity of scattered light is relevant with scattering direction, and and
The biquadratic of wavelength is inversely proportional to.”.So need to for the design parameter of the spectral response curve of different CDD imaging systems with
And wavelength of light correspondence light scattering ability carries out the compromise selection of light source, the inclined red light source of prioritizing selection.
Direct projection illumination mode makes light more concentrate, and illumination is bigger, the advantage improving energy density, it is contemplated that communication relay
Device contact surface precision processing stage is relatively low, belongs to diffuse-reflective material, so selecting direct projection illumination mode.Additionally, ring light
Source (Fig. 2) according to different irradiating angles, different colours combination, thus more can highlight object information；Save and install
Space, can solve diagonal angle irradiate shadow problem, uniform light diffusion can solve conforming problem, it is possible to install additional as required
Polaroid.
(3) use the selecting type cross mask means of improvement to figure after being shielded by the communication relay image HFS of collection
As smoothing
Conventional image smoothing method has neighbor smoothing method, frequency domain smoothing method etc., and these smoothing techniques can bring the defect of equalization,
The lines that image border is changed thicken.For communication relay contact spacing test problems, the edge of image
Part crucial exactly.So using the selecting type mask that i.e. can complete smothing filtering the most not destroyed area edge details to put down
Sliding method.Traditional selecting type mask smoothing techniques uses tetragon and pentagonal mask due to it in the polygonal selection of neighborhood
Area pixel point repetitive rate cannot ensure identical, although only 9 neighborhoods, but part adjoint point can be caused to reuse repeatedly,
And part adjoint point simply uses 1 time, loss of learning is caused to affect smooth effect.Here propose to use cross mask to reduce
The degeneration of image border, as shown in Figure 3.Use cross mask to reduce the degeneration of image border, choose 5*5 window,
In window with pixel f (x, y) on the basis of point, make 9 cross masks, then to pixel, (x, 9 cross neighborhoods y) are asked
Variance computing, finds the neighborhood that variance is minimum, seeks each point gray scale frequency in the picture in this region, be converted into corresponding each district
The weighting silver in territory, obtains weighted mean, weighted mean is assigned to pixel (x, y).
(4) image after smoothing uses improvement cross structure element dilation erosion method to carry out rim detection
Dilation erosion algorithm is a kind of morphological method, is that the image after being corroded by the figure image subtraction after expanding obtains image
The advantage of this algorithm of edge is to have directionless tendentiousness from effect of noise, the feature that capacity of resisting disturbance is strong.Structure
Element is morphologic basic operator, and Rational choice structural element directly affects effect and the quality of image procossing.Structural element
Selection be the shape and size of structural element.Structural element can have different shapes, circle, square, rhombus,
Hexagon, line segment shape are all the shapes that can select.Difform structural element operation result can be variant, should be for treating
The geometry processing image selects.The cross structure element dilation erosion method process improved is as shown in Figure 4: will be smooth
Image afterwards is divided into the sub-block of several 20*20, chooses about+2 4*2 rectangle of 4*4 center square in center
About+2 2*4 rectangular sub blocks of block are combined into a cross structure element (totally 48 pixels)；Then by this stauros constitutive element
Element expands, and becomes about+2 about+2,6*2 rectangular sub blocks 2*6 of a 6*6 center square centered by former cross
Rectangular sub blocks is combined into new expansion cross, then both subtracts each other (corrosion), it is thus achieved that edge, be repeated a number of times until
The sub-block of all images all completes this kind of dilation erosion, it is thus achieved that the edge of general image.
(5) according to the edge of detection, image carried out metering contact spacing after high frequency enhancement
Strengthen the high fdrequency component of original image, by the contrast between neighbor pixel, make image realize sharpening, improve contrast,
Make picture distincter.Then find contact position by target recognition, carry out distance measurement.
Setup Experiments is as follows: CCD imaging system parameters is as follows: resolution 2000*1500 photosensitive unit, photosensitive size
4.0*4.0um 2, unit, effective sensitization area 10*10mm2 (mm is millimeter), select inclined red light source (wavelength 500
Nanometer).High-frequency communication relay uses Omron-G5Y model relay.Experimental result is as shown in Figure 5.
Claims (4)
1. an accurate communication relay contact spacing detection method based on sensing imaging system, it is characterised in that bag
Include following steps:
1) require to determine systemic resolution and imaging system ginseng according to communication relay contact spacing certainty of measurement
Number；
2) according to design parameter and the wavelength of light correspondence light scattering energy of the spectral response curve of imaging system
Power carries out the selection of light source, determines illumination mode；
3), after the communication relay image HFS shielding that will gather, the selecting type cross improved is used
Image is smoothed by mask means；
4) image after smoothing uses improvement cross structure element dilation erosion method to carry out rim detection；
5) according to the edge of detection, image carried out metering contact spacing after high frequency enhancement.
Accurate communication relay contact spacing detection side based on sensing imaging system the most according to claim 1
Method, it is characterised in that determine that imaging system parameters is as follows: resolution 2000*1500 photosensitive unit, sense
Light size 4.0*4.0um2, photosensitive unit effective sensitization area 10*10mm2。
Accurate communication relay contact spacing detection side based on sensing imaging system the most according to claim 1
Method, it is characterised in that step 3) the process that implements include: choose 5*5 window, in the window
With pixel f (x, y) on the basis of point, make 9 cross masks, then to pixel (x, 9 crosses y)
Neighborhood asks variance computing, finds the neighborhood that variance is minimum, seeks each point gray scale frequency in the picture in this neighborhood
Rate, is converted into the weighter factor of corresponding 9 cross masks, obtains weighted mean, be assigned to by weighted mean
Pixel f (x, y).
Accurate communication relay contact spacing detection side based on sensing imaging system the most according to claim 1
Method, it is characterised in that step 4) the process that implements include: will smooth after image be divided into
The sub-block of several 20*20, chooses 4*4 center square, about 2 4*2 rectangle in center
Block, about 2 2*4 rectangular sub blocks are combined into a cross structure element；Then by this stauros constitutive element
Element expands, and becomes a 6*6 center square centered by described cross structure element, 2 left sides
Right 6*2 rectangular sub blocks, about 2 2*6 rectangular sub blocks are combined into new expansion cross, then by cross
Structural element, new expansion cross subtract each other, it is thus achieved that edge, are repeated a number of times the son until all images
Block all completes this kind of dilation erosion, it is thus achieved that the edge of general image.
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| CN110084847A (en) * | 2018-01-22 | 2019-08-02 | 浙江大学 | Relay measuring device and its image processing method |
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Inventor after: Ruan Xiukai Inventor after: Shi Xiaojing Inventor after: Liu Zehua Inventor after: Lao Liying Inventor after: Zhang Yaoju Inventor after: Cai Qibo Inventor after: Dai Yuxing Inventor after: Zhu Xiangou Inventor after: Yang Weibo Inventor after: Cui Guihua Inventor after: Li Han Inventor before: Zhang Yaoju Inventor before: Lao Liying Inventor before: Liu Zehua Inventor before: Cai Qibo Inventor before: Ruan Xiukai Inventor before: Yang Weibo Inventor before: Cui Guihua Inventor before: Tan Yanhua Inventor before: Li Han Inventor before: Shi Xiaojing Inventor before: Zhu Xiangou |
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