CN205860994U - The automatic measurement system of feature based Point matching - Google Patents

Abstract

The utility model discloses the automatic measurement system of a kind of feature based Point matching, wherein, this measurement system mainly include the twin shaft electric control platform for driving lens mold to move, be carved with the mask plate of regular pattern, microscope, imageing sensor, for image acquisition, process and control the control system of die shift, lifting support and base.Measuring method comprises the steps: that the quantity of the size according to lens mold and injecting hole selects suitable stepping to take pictures scheme；Scaling board is put in electric control platform, image capture module is demarcated；Taking scaling board away, mould and mask plate are fixed in electric control platform, control module drives electric control platform that mould is carried out stepping and takes pictures；Measurement process module captures the characteristic point in view data, mates the characteristic point in different images and processes, obtaining the aperture information of injecting hole in mould.Simple in construction of the present utility model, low cost, easy to use, certainty of measurement is high, and treatment effeciency is high.

Description

The automatic measurement system of feature based Point matching

Technical field

This utility model relates to lens mold fields of measurement, particularly relates to one and utilizes Matching Technology of Feature Point to measure hands The measurement system of the injecting hole size on glass lens mould and relative position in machine camera lens.

Background technology

At present, mobile lens uses glass lens mostly, and eyeglass needs to measure the injecting hole in lens mold before injection Pore size and relative position, in order to molten plastic can be injected in the middle of mould by injecting head exactly.Due to lens mold In comprise up to a hundred injecting holes, utilize conventional image split-joint method to be difficult to obtain high-precision aperture size, normal image is spelled The method of connecing is applicable to the measurement of single aperture mould, when measuring multiple aperture mould (mobile-phone lens mould), and computer image system Amount of image information to be dealt with is very big, and process time length, efficiency are low, causes the size measured and positional precision all to be paid no attention to Think, it is difficult to meet the requirement of modern industry.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that a kind of place that can either reduce view data Reason amount, improves the automatic measurement system of certainty of measurement simultaneously.

The purpose of this utility model is achieved through the following technical solutions:

The automatic measurement system of a kind of feature based Point matching is automatically controlled flat including the twin shaft for driving lens mold to move Platform, be carved with the mask plate of regular pattern, microscope, imageing sensor, for image acquisition, the control that processes and control die shift System processed, lifting support and base.Wherein, microscope and imageing sensor are co-axially mounted, and it is automatically controlled that its optical axis is perpendicular to twin shaft Platform.

Concrete, lens mold being fixed in described twin shaft electric control platform, described mask plate is arranged on above mould, institute Stating twin shaft electric control platform, mould and mask plate three to be relatively fixed, will not produce relative displacement in moving process, twin shaft is automatically controlled Platform stepping under the driving of control system is taken pictures and measures the dimension information of mould by capturing the characteristic point in image.Institute Stating microscope and be positioned at the top of mask plate, fix with one end of lifting support and be connected, described imageing sensor is arranged on microscope On, gather the image information of mould by microscope and send control system to, the other end of described lifting support is arranged on the end On seat, improve the image quality of imageing sensor by regulating microscopical height.

Described control system includes image capture module, control module and measurement process module.Described image capture module It is connected with imageing sensor, by imageing sensor, the image information collected is converted into accessible view data.Described Control module is connected with twin shaft electric control platform, controls mould and mask plate step distance on platform.Described measurement processing mould Block captures and mates the characteristic point in the view data that image capture module generates to the aperture information calculating on mould.

Described automatic measurement system also includes measuring the front mark of the actual size that unit sizes is corresponding in uncalibrated image Determine plate.Before formal measurement, utilize described scaling board that image acquisition and processing system is demarcated, determine times magnification accurately Rate, described scaling board is arranged in twin shaft electric control platform, and scaling board is provided with regular pattern, is adopted by imageing sensor Collection, demarcates image, simple to operation, can significantly improve the precision of the measurement of system.

As preferred version of the present utility model, described mask plate is glass material, uses laser technology to carve from the teeth outwards Carve the regular pattern for increasing image characteristic point quantity.The live width of this pattern be about mould aperture loop line wide ten/ One, facilitate later image in processing, to use corrosion expansion algorithm mould aperture annulus and mask plate pattern to be split smoothly.

As preferred version of the present utility model, described twin shaft electric control platform is X-axis and Y-axis electric control platform.Described mask Plate uses laser technology to carve, and contributes to controlling well live width, and engraving precision is high, effective, and while engraving Surface of the work will not be injured or cause workpiece to deform.Described microscope uses varifocal telecentricity micrometer microscope, can be according to mould Enlargement ratio that size Selection is different and operating distance, and image quality is high.Described microscope is provided with for focusing Regulation ring, described regulation ring is used for adjusting microscopical imaging focal length, and the image making imageing sensor gather is high-visible.

The measuring method of the automatic measurement system of a kind of feature based Point matching, comprises the steps:

Step S1: select suitable stepping to take pictures scheme according to the size of lens mold and the quantity of injecting hole.Its In, described step S1 also comprises the steps:

Step S11: be fixed on measuring table by mould, makes mold plane and imageing sensor and microscopical measurement light Axle keeps vertical；

Step S12: regulation microscope magnifications, makes pixel allowable error more than 4 pictures under meeting required precision Element, for reducing the error that later stage circular fit produces；

Step S13: regulate microscopical regulation ring and focus, and select suitable operating distance, make imageing sensor The image gathered is clear, good imaging quality；

Step S14: according to the pore size on mould and spacing, select suitable stepped intervals, stepping for measuring table Amount and stepping route, stepped intervals is less than 1/2nd of picture traverse so that the overlapping region of adjacent two width images is relatively big, really Protecting during later image processes and use template matching algorithm to carry out the accuracy of Feature Points Matching, stepping-in amount and stepping route are according to step Enter to be spaced continued circling mould aperture one week.

Step S2: scaling board is put in electric control platform, image capture module is demarcated.Wherein, described step S2 In also comprise the steps:

Step S21: be placed horizontally on measuring table by scaling board, carries out image by image capture module to scaling board Gather；

Step S22: captured scaling board image is carried out fixed point pixel coordinate extraction, enters in measurement process module Row camera system is demarcated, and draws enlargement ratio accurately.

Step S3: take scaling board away, is fixed on mould and mask plate in electric control platform, and control module drives electric control platform Mould is carried out stepping take pictures.Wherein, described step S3 also comprises the steps:

Step S31: select the size of laser lithography mask plate according to mould size, make mask plate that mould can be completely covered Tool；

Step S32: according to the aperture on mould micrometer microscope amplify under annulus live width determine that laser lithography is covered The live width of lamina membranacea regular pattern, the live width of mask plate regular pattern is 1/10th that mobile-phone lens mould aperture loop line is wide；

Step S33: according to the visual field size of image capture module, draw the pattern of laser lithography mask plate, it is ensured that mask Plate pattern is without repetitions patterns in two visual field sizes, and pattern spacing is moderate, can not be overstocked, and line pitch is more than ten times of lines Width, prevents mask plate pattern overstocked and covers the aperture of lower section mould；

Step S34: the pattern line of laser lithography mask plate is the nontransparent material that reflectance is relatively low, the lines of this material In imaging more substantially, contribute to screening and the coupling of characteristic point, the treatment effeciency of image can be significantly improved, reduce work Amount；

Step S35: laser lithography mask plate is carved with a mold-griping surface of regular pattern, and keep mask plate, Mobile-phone lens mould and electronic control translation stage object stage three are relatively fixed, and will not produce relative displacement when stepping is taken pictures, and improve The certainty of measurement of system.

Step S4: measurement process module captures the characteristic point in view data, is carried out the characteristic point in different images Join and process, obtaining the aperture information of injecting hole in mould.Wherein, described step S4 also comprises the steps:

Step S41: set a null point collection D；

Step S42: adjacent two width images are carried out feature point detection and coupling, it is thus achieved that the relative coordinate conversion of two width images Matrix T；

Step S43: two width images in step S41 carry out dividing processing, obtains the sub-pix wheel of mould aperture annulus Wide edge point set, wherein the profile point set of Prototype drawing is A, and the profile point set of figure to be matched is B, and point set A is merged into point set D =[D, A]；

Step S44: transformation matrix T acts on point set D, obtains point set C；

Step S45: merged with point set C by point set B, obtains point set D=[B, C]；

Step S46: repetition step S42 is to step S46, until having processed all images；

Step S47: utilize method of least square that point set D is justified matching, obtains diameter and the relative distance of multiple aperture.

Work process of the present utility model and principle be: this utility model first passes through the scaling board image to the system of measurement Gather and processing module is demarcated, draw accurate enlargement ratio；Then mould is put into together with mask plate measuring table On, select suitable stepping to take pictures scheme and stepping circuit start measurement of taking pictures；Band is generated finally by image capture module There is the view data of characteristic point, by image processing module, the view data generated is carried out Feature Points Matching and matching, calculate Go out the multiple aperture size on mould and relative position.Simple in construction of the present utility model, low cost, easy to use, utilize with The mask plate of regular pattern increases image characteristic point quantity and combines the measurement scheme of feature based Point matching, can significantly improve The precision of measurement system, significantly reduces the workload of image procossing simultaneously；It addition, this utility model is at original platform of not upgrading On the basis of certainty of measurement is improved an order of magnitude (bringing up to 1um from 10um), not only save cost, but also shorten place The reason time, improve work efficiency.

Compared with prior art, this utility model also has the advantage that

(1), compared with measuring system with traditional artificial light electrical image, the twin shaft of this utility model use 10um precision is automatically controlled Translation stage realizes Automated condtrol.

(2) this utility model utilizes the method for Feature Points Matching to obtain sub-pixel edge profile point relative of multiple images Coordinate, compared with utilizing image mosaic method acquisition image relative coordinate, this method can be substantially reduced data processing amount, hence it is evident that improves Treatment effeciency.

(3) this utility model by mask plate and Matching Technology of Feature Point with the use of, it is thus achieved that high-precision aperture chi Very little, compared with using expensive 1um precision twin shaft electric control platform scheme, there is extremely low cost advantage, be greatly saved equipment Disposable input.

(4) this utility model uses Image Feature Point Matching technology to replace traditional image mosaic technology, can substantially subtract The treating capacity of few image, reduces the workload of technology machine, improves processing speed and the efficiency of image, it is thus achieved that the hole of higher precision Footpath size.

Accompanying drawing explanation

Fig. 1 is the structural representation of automatic measurement system provided by the utility model.

Fig. 2 is the flow chart of the measuring method of feature based Point matching provided by the utility model.

Fig. 3 is the mask plate with regular pattern provided by the utility model.

Fig. 4 is the partial enlarged drawing of regular pattern provided by the utility model.

Label declaration in above-mentioned accompanying drawing: 1-mask plate, 3-microscope, 4-imageing sensor, 5-lifting support, at the bottom of 6- Seat.

Detailed description of the invention

For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, develop simultaneously enforcement referring to the drawings The utility model is described in further detail for example.

Embodiment 1:

As it is shown in figure 1, the mobile-phone lens mould micron order that the utility model discloses a kind of feature based Point matching is automatic Measurement system, this system specifically includes that twin shaft electronic control translation stage (not shown), laser lithography mask plate 1, scaling board (figure Not shown in), microscope 3, imageing sensor 4, lifting support 5, base 6, image capturing system (not shown), computer Control and measurement processing system (not shown).

Wherein, the twin shaft electronic control translation stage of 10um precision is made up of twin shaft translation stage and numeral control chamber, puts for level Put mobile-phone lens mould, X-axis and the single step of Y-axis can be realized or multistep translation controls, it is achieved Automatic survey.

Wherein, as shown in Figure 3 and Figure 4, laser lithography mask plate 1 is carved with custom rule pattern, is covered in lens mold Surface, increases image characteristic point, is remarkably improved later image Feature Points Matching precision.

Wherein, image capturing system is made up of imageing sensor 4 and varifocal telecentricity micrometer microscope 3, image acquisition system System optical axis is orthogonal with twin shaft electronic control translation stage, and varifocal telecentricity micrometer microscope 3 is provided with regulation ring (not shown), Fine-tuning working distance reaches the effect of focusing, it is possible to realize different multiplying powers and working distance.

Wherein, computer control and measurement processing system can carry out twin shaft electronic control translation stage control, camera system is demarcated, Image characteristic point detection and matching operation, sub-pixel edge contours extract and round matching operation result of measurement.

As depicted in figs. 1 and 2, the invention also discloses the mobile-phone lens mould micron of a kind of feature based Point matching Level method for automatic measurement, mainly comprises the steps:

S1: require to select suitable enlargement ratio according to certainty of measurement, select suitably according to mobile-phone lens die size Translation stage stepping scheme；

The demarcation of S2: image capturing system；

S3: combine laser lithography mask plate 1 and gather image；

S4: process image and Feature Points Matching in computer measurement processing system, measures multiple aperture diameter And relative distance.

Preferably, for step S1, require to select suitable enlargement ratio, according to Mobile phone mirror according to certainty of measurement Die size Selection suitable translation stage stepping scheme comprises the steps:

S1-1: mobile-phone lens mould is fixed on twin shaft electronic control translation stage object stage, with imageing sensor 4 and varifocal far Heart micrometer microscope 3 groups keeps vertical；

S1-2: regulation micrometer microscope 3 enlargement ratio, makes pixel allowable error more than 4 under meeting required precision Pixel；

S1-3: regulate varifocal telecentricity micrometer microscope 3 and regulate ring and focus, selects proper operation distance；

S1-4: according to mobile-phone lens mould pore size and spacing, selects suitable electronic control translation stage stepped intervals, stepping Amount and stepping route, stepped intervals should be less than 1/2nd of picture traverse, stepping-in amount and stepping route it is ensured that according to stepping One week, continued circling mobile-phone lens mould aperture, interval.

Preferably, for step S2, the demarcation of image capturing system comprises the steps:

S2-1: scaling board is placed horizontally at electronic control translation stage, carries out scaling board image acquisition with image capturing system；

S2-2: captured scaling board image is carried out fixed point pixel coordinate extraction, in computer measurement processing system In carry out camera system demarcation, draw accurate enlargement ratio.

Preferably, for step S3, gather image in conjunction with laser lithography mask plate and comprise the steps:

S3-1: select laser lithography mask plate 1 size according to mobile-phone lens mould size, make mask plate 1 to be completely covered Mobile-phone lens mould；

S3-2: according to mobile-phone lens mould aperture micrometer microscope 3 amplify under annulus live width determine laser lithography Mask plate 1 pattern line-width, mask plate 1 pattern line-width is about 1/10th that mobile-phone lens mould aperture loop line is wide；

S3-3: according to image capturing system visual field size, draws laser lithography mask plate 1 pattern, it is desirable to mask 1 plate pattern Without repetitions patterns in two visual field sizes, and pattern can not be overstocked, and line pitch should be greater than ten times of live widths；

S3-4: laser lithography mask plate 1 pattern line should be the nontransparent material that reflectance is relatively low；

S3-5: the one side that laser lithography mask plate 1 is carved with custom rule pattern is adjacent to mobile-phone lens die surface, protects Hold mask plate 1, mobile-phone lens mould and electronic control translation stage object stage without relative displacement.

Preferably, for step S4, image is processed and characteristic point in computer measurement processing system Coupling, measures multiple aperture diameter and relative distance comprises the steps:

S4-1: set a null point collection D；

S4-2: adjacent two width images are carried out feature point detection and coupling, it is thus achieved that the relative coordinate conversion square of two width images Battle array T；

S4-3: two width images in S4-1 step carry out dividing processing, obtains the sub-pix of phone mould aperture annulus Contour edge point set, wherein the profile point set of Prototype drawing is A, and the profile point set of figure to be matched is B, and is merged into a little by point set A Collection D=[D, A]；

S4-4: transformation matrix T acts on point set D, obtains point set C；

S4-5: merged with point set C by point set B, obtains point set D=[B, C]；

S4-6: repeat step S4-2 to S4-6, until having processed all images；

S4-7: utilize method of least square that point set D is justified matching, obtains diameter and the relative distance of multiple aperture.

Work process of the present utility model and principle be: this utility model first passes through the scaling board image to the system of measurement Gather and processing module is demarcated, draw accurate enlargement ratio；Then mould is put into measuring table together with mask plate 1 On, select suitable stepping to take pictures scheme and stepping circuit start measurement of taking pictures；Band is generated finally by image capture module There is the view data of characteristic point, by image processing module, the view data generated is carried out Feature Points Matching and matching, calculate Go out the multiple aperture size on mould and relative position.Simple in construction of the present utility model, low cost, easy to use, utilize with The mask plate 1 of regular pattern, as scale the measurement scheme that combines feature based Point matching, can significantly improve measurement system Precision, significantly reduce the workload of image procossing simultaneously；It addition, this utility model will on the basis of original platform of not upgrading Certainty of measurement improves an order of magnitude (bringing up to 1um from 10um), not only saves cost, but also shortens the process time, Improve work efficiency.

Above-described embodiment is this utility model preferably embodiment, but embodiment of the present utility model is not by above-mentioned The restriction of embodiment, other any without departing from the change made under spirit of the present utility model and principle, modify, replace In generation, combine, simplify, all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.

Claims (5)

1. the automatic measurement system of a feature based Point matching, it is characterised in that include for driving lens mold to move Twin shaft electric control platform, be carved with the mask plate of regular pattern, microscope, imageing sensor, for image acquisition, process and control mould The tool control system of displacement, lifting support and base；

Lens mold is fixed in described twin shaft electric control platform, and described mask plate is arranged on above mould, and described twin shaft is automatically controlled flat Platform, mould and mask plate three are relatively fixed, and under the driving of control system, stepping is taken pictures and by capturing the feature in image Point measures the dimension information of mould；Described microscope is positioned at the top of mask plate, fixes with one end of lifting support and is connected, institute State imageing sensor to be arranged on microscope, gather the image information of mould by microscope and send control system to, described The other end of lifting support is arranged on base, improves the image quality of imageing sensor by regulating microscopical height.

The automatic measurement system of feature based Point matching the most according to claim 1, it is characterised in that described control system Including image capture module, control module and measurement process module；Described image capture module is connected with imageing sensor, passes through The image information collected is converted into accessible view data by imageing sensor；Described control module and twin shaft electric control platform Connect, control mould and mask plate step distance on platform；Described measurement process module captures and mates image acquisition mould Characteristic point in the view data that block generates calculates the aperture information on mould.

The automatic measurement system of feature based Point matching the most according to claim 2, it is characterised in that described automatic measurement System also includes measuring the front scaling board of the actual size that unit sizes is corresponding in uncalibrated image；Described scaling board is arranged on In twin shaft electric control platform.

The automatic measurement system of feature based Point matching the most according to claim 2, it is characterised in that described mask plate is Glass material, uses laser technology to carve the regular pattern for tolerance from the teeth outwards.

The automatic measurement system of feature based Point matching the most according to claim 2, it is characterised in that on described microscope Being additionally provided with the regulation ring improving image quality, described regulation ring is used for regulating microscopical focal length.