CN103792686A - Corneal contact lens comprehensive detector and focusing evaluating algorithm thereof - Google Patents
Corneal contact lens comprehensive detector and focusing evaluating algorithm thereof Download PDFInfo
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- CN103792686A CN103792686A CN201410039469.6A CN201410039469A CN103792686A CN 103792686 A CN103792686 A CN 103792686A CN 201410039469 A CN201410039469 A CN 201410039469A CN 103792686 A CN103792686 A CN 103792686A
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Abstract
The invention relates to a corneal contact lens comprehensive detector and a focusing evaluating algorithm of the corneal contact lens comprehensive detector. The corneal contact lens comprehensive detector comprises an optical imaging device, an electronic ocular, an objective table, a lifting device, a digital dial indicator, a singlechip and a tablet personal computer and corresponding measuring control software, wherein a collimation light pipe is arranged between the ocular and an objective lens; an LED (light-emitting diode) oblique incidence lighting device and a dark filed lighting device are also respectively arranged above and below the objective table; a digital dial indicator probe is contacted with the objective table, and a digital signal is output to a controller; the lifting device comprises a vertical arm fixed on a base, guide rails and a stepping motor arranged on the vertical arm, and a gear and rack transmission device which realizes the variable speed lifting by switching an electromagnetic clutch, and the stepping motor and the electromagnetic clutch are controlled by a controller. The corneal contact lens comprehensive detector and the focusing evaluating algorithm of the corneal contact lens comprehensive detector provided by the invention have the advantages that a lens surface quality detection function and a lens diameter measuring function are also integrated, the intelligent measurement of a lens is realized, and the detection efficiency and measurement accuracy are improved.
Description
Technical field
The present invention relates to a kind of contact lens comprehensive detector and focus on evaluation algorithms.
Background technology
Contact lens test join with production run in, need to base arc radius-of-curvature, optic diameter and the surface quality of eyeglass be measured accurately and be detected.Adopt respectively at present base arc instrument, diameter chi and three kinds of equipment of stereomicroscope to detect, all need again eyeglass is loaded and unloaded, located and focuses at every turn, operating process complexity, detection efficiency are low.The base arc radius-of-curvature of eyeglass will guarantee that detecting error is less than 0.02mm, needs at present manual adjustment and visual inspection to judge eyeglass sharpness, reads dial gauge data.Measurement result is affected by human factors larger, and operator's fatiguability, and this greatly reduces measuring accuracy and work efficiency.
Summary of the invention
The object of the present invention is to provide a kind of contact lens comprehensive detector and focus on evaluation algorithms, eyeglass base arc radius-of-curvature is detected for this detector and focusing evaluation algorithms thereof and surface quality measuring ability is integrated in one, and measuring process has realized digitizing and robotization, this has improved measuring accuracy and detection efficiency greatly.
For achieving the above object, contact lens comprehensive detector of the present invention has adopted following technical scheme:
System is made up of optical imaging device, electronic eyepiece, objective table, jacking gear, digital dial gauge, single-chip microcomputer and panel computer and corresponding measurement control software thereof.
Adopt autocollimation method to carry out the measurement of eyeglass base arc radius-of-curvature.
Specifically, described electronic eyepiece is the electronic eyepiece that adopts the electronic eyepiece of ccd image sensor or adopt cmos image sensor, and this electronic eyepiece is connected with panel computer by usb data line.
Between described eyepiece and object lens, be provided with collimating light pipe, described collimating light pipe is made up of LED lamp source, graticule, condenser lens and prism.
Described dial gauge is digital dial gauge, and this numeral dial gauge one end contacts by probe and the objective table of digital dial gauge, and the other end is connected with controller by control line, and digital signal is outputed to controller.
Described controller, take single-chip microcomputer as core, can record the real-time measuring data of digital dial gauge, and has stepper motor subdivision drive circuit.Be connected with panel computer by signal wire.
Described jacking gear comprises the armstand being fixed on base, the stepper motor that is arranged on the guide rail in armstand and moves for driving objective table; On described guide rail, be equipped with can vertical displacement movement objective table; The input end of described stepper motor is connected with the output terminal of controller, and output drives objective table to make vertical displacement movement along guide rail by electromagnetic clutch and rack-and-pinion lifting actuator.Described rack and pinion drive has coarse adjustment F.F. and two kinds of modes of fine tuning slow-motion.Objective table upper and lower arranges respectively LED oblique illumination device and dark ground illumination device.
Described stepper motor is driven by singlechip controller, be connected with rack-and-pinion lifting actuator by electromagnetic clutch, make electromagnetic clutch adhesive or release according to the different phase of measuring stroke, and the pulsed frequency of change Driving Stepping Motor, to control F.F. coarse adjustment and the fine setting motion of objective table.Described riser guide is decussation roller guide rail, to obtain higher measuring accuracy and longer serviceable life.
Described dark ground illumination device is located on described base, and diaphragm can be adjusted by handwheel.Oblique illumination device is located at object lens below, and irradiating angle can regulate by spherical joint.
Another object of the present invention is to provide a kind of focusing evaluation algorithms of contact lens comprehensive detector, this simplify of arithmetic computing, improved measurement efficiency.This algorithm comprises the following steps:
(1) by panel computer, luma samples threshold value and sampling time interval and space interval are set;
(2) software-driven electronic eyepiece carries out real time image collection by certain hour interval, obtains luma samples value;
(3) program is according to the analysis to luma samples value, judge the position of eyeglass to be measured with respect to focus point, send corresponding control signal to electromagnetic clutch and stepper motor by controller, make objective table by suitable speed feeding (requirement is nearer apart from focus point, and feeding is slower).
(4) in program, start and focus on evaluation thread, the image array gathering is carried out to binary conversion treatment, and add up bright spot number.In the situation that brightness is greater than threshold value, when bright spot number reaches minimal value, show in focus position.
(5) distance of measuring two focus positions in whole stroke by digital dial gauge is the base arc radius-of-curvature of eyeglass to be measured.
Specifically, the detailed process that luma samples value is analyzed described in step (3) is:
If luma samples value is less than the threshold value setting, show not yet to arrive focal zone, controller control electromagnetic clutch and stepper motor, driving objective table fast feed.When luma samples value is greater than the luminance threshold setting, show to approach focus position, controller control electromagnetic clutch and stepper motor, make objective table by the speed feeding being inversely proportional to luma samples value.In the time that luma samples value approaches maximal value, show to approach very much focus point, objective table is finely tuned feeding to judge exactly focus position with very slow speed.
The principle of focusing evaluation algorithms of the present invention is:
Because be focuses on evaluation analysis in kinetic measurement process, conventional algorithm can cannot guarantee the real-time of measuring because taking the more time.According to pattern feature and experimental study, the present invention has selected bright spot number after image pixel intensity and binaryzation to combine and focus on evaluation analysis, has obtained good effect.The basic ideas of this algorithm are: optics graticule is carved with some intensive horizontal and vertical straight lines, and the image of these lines is carried out to digital binary conversion treatment, and when poor focusing, the brightness of image lines is lower, edge fog, and the pixel bright spot number after binaryzation is more.And when in best focus, the brightness of image lines approaches maximum value.Because of edge clear, there is minimal value in the pixel bright spot number after binaryzation, arrives focus position simultaneously.If respectively X and Y direction are carried out to the minimizing statistical study of pixel bright spot number, radius of curvature R x and the Ry that can also realize toric both direction measure.
Advantage of the present invention:
(1) the present invention has realized digitizing and the robotization of the radius of curvature measurement of contact lens eyeglass, has reduced human factor to the impact of measuring.On the basis of optical autocollimating mensuration, with the alternative optics eyepiece of electronic eyepiece, focus on sharpness with the analysis of computing machine image identification system and replace eye-observation, focus by computer-controlled stepper motor simultaneously, data-interface automatic acquisition by digital dial gauge and record measurement result, has realized digitizing and the intellectuality of measuring.
(2) the present invention has realized the comprehensive detection of eyeglass base arc radius-of-curvature and lens surface quality.Carry out the detection of eyeglass base arc radius-of-curvature by collimating light pipe is set on detector, dark ground illumination device is set simultaneously under eyeglass to be measured, by analyzing the image detection lens surface quality of lens surface.Realize eyeglass base arc radius-of-curvature and surface quality measuring ability have been integrated in one.Simplify testing process, improved detection efficiency.
(3) the each light source of the present invention all adopts high-power LED light source, switches by multi-position switch.While measuring base arc, use the light source of collimating light pipe.While detecting surface quality, adopt the dark ground illumination light source of object lens below, utilize scattering effect to make the cut of contact lens lens surface to be measured and flaw can produce the analytical control of pattern confession clearly.
(4) focusing evaluation algorithms of the present invention, according to the feature of image that this detector gathers, carries out sampling statistics along X-axis and Y-axis respectively at certain intervals.This algorithm has not only greatly reduced computing time, also can draw respectively evaluation result to X-axis and Y-axis both direction, has solved toric lens (as Toric) base arc and have the measurement problem of Rx and two different curvature radius values of Ry.
In sum, detector of the present invention is according to practical measurement requirement, adopt succinct focus function evaluation algorithms, digitizing and the robotization of eyeglass base arc radius of curvature measurement are not only realized, also the detection of eyeglass base arc radius-of-curvature and surface quality measuring ability are integrated in one, have greatly improved measuring accuracy and detection efficiency.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein:
1, eyepiece, 2, collimating light pipe, 3, object lens, 4, eyeglass, 5, objective table, 6, rack and pinion drive, 7, riser guide, 8, stepper motor, 9, dark ground illumination device, 10, base, 11, digital dial gauge, 12, panel computer, 13, manual focusing knob, 14, controller, 15, electromagnetic clutch, 16, LED oblique illumination device.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
Embodiment 1
A kind of contact lens comprehensive detector as shown in Figure 1, comprises eyepiece 1, object lens 3, objective table 5, dial gauge 11.Specifically, eyepiece 1 is electronic eyepiece, between eyepiece 1 and object lens 3, is provided with collimating light pipe 2, and dial gauge 11 is digital dial gauge, and objective table 5 belows are installed with jacking gear, and jacking gear is provided with dark ground illumination device 9.Specifically, collimating light pipe 2 comprises successively connected LED lamp source, graticule, condenser lens and prism.Under described object lens 3, be provided with LED dark ground illumination device.Electronic eyepiece 1 adopts cmos image sensor.Numeral dial gauge 11 contacts by probe and objective table 5, and output signal end is connected with controller 14 by control line.On objective table 5, be installed with the locating device for locating eyeglass 4 detection positions.The rotatable circular pallet that comprises square pallet and be movably arranged on square pallet top for locating the locating device of eyeglass 4 detection positions, round tray is provided with 4 detents along circumference, is installed with spring locating piece on square pallet.By the cooperation of locating device upper groove and locating piece, can realize the Fast Installation location of eyeglass.
By collimating light pipe 2 is set on detector, adopt collimation method to measure radius-of-curvature, guarantee higher measuring accuracy.On the basis of optical autocollimating mensuration, with the alternative optics eyepiece of electronic eyepiece, focus on sharpness with the analysis of computing machine image identification system and replace eye-observation, drive lifting of lifting table to focus by computer-controlled stepper motor and electromagnetic clutch simultaneously, data-interface automatic acquisition by digital dial gauge and record measurement result, realizes digitizing and the robotization of measuring.
This detector arranges dark ground illumination device 9 and carries out the detection of lens surface quality simultaneously under eyeglass 4 to be measured.By dark ground illumination device 9, utilize scattering effect, make the surface scratch of contact lens eyeglass 4 to be measured and flaw can produce the analytical control of pattern confession clearly, to realize the intellectuality of lens surface quality testing.
Further, electronic eyepiece 1 is connected with panel computer 12 by usb data line.Controller 14 is connected with panel computer 12 by signal wire.Control detector testing process by panel computer 12 and controller 14, realized the digitizing and the robotization that detect.
Further, described jacking gear comprises guide rail 7, is fixedly mounted on the base 10 of guide rail 7 belows and for controlling the stepper motor 8 of stage movement; The input end of described stepper motor 8 is connected with the output terminal of controller 14, and output is connected with lifter wheel rack gearing 6 by electromagnetic clutch 15.
Described jacking gear comprises the armstand 17 being fixed on base 10, the stepper motor 8 that is arranged on the guide rail 7 in armstand 17 and moves for driving objective table.On described guide rail 7, be equipped with can vertical displacement movement objective table 5; The input end of described stepper motor 8 is connected with the output terminal of controller 14, and output drives objective table 5 to make vertical displacement movement along guide rail by electromagnetic clutch 15 and rack and pinion drive 6.Described rack and pinion drive has coarse adjustment and two kinds of feeding modes of fine tuning.Electromagnetic clutch 15 connects stepper motor 8 and lifter wheel rack gearing 6, under the control of controller 14, while obtaining electric adhesive, drive fast motion device, when power-off, drive slow-motion device, between coarse adjustment and two kinds of modes of fine tuning, switch, can effectively save detection time.
Image acquisition is arrived panel computer by electronic eyepiece, pixel intensity and the analysis image focus state of corresponding process of measurement capturing digital image, output steering order is to controller, controller Driving Stepping Motor and electromagnetic clutch, control objective table fast or lifting at a slow speed, numeral dial gauge is measured the position data of twice focus in lifting process, and this position data is passed to panel computer by controller, thereby calculates the base arc radius-of-curvature of eyeglass to be measured.
Another object of the present invention is to provide a kind of focusing evaluation algorithms for above-mentioned contact lens comprehensive detector, and this algorithm comprises the following steps:
(1) by panel computer, luminance threshold and sampling interval are set;
(2), according to sampling interval, controller transmits control signal and drives electronic eyepiece to carry out real time image collection;
(3) according to the threshold value and the luma samples maximal value that set, luma samples value is analyzed;
(4) controller is according to analysis result, and controller sends corresponding control signal to stepper motor, makes stepper motor drive lifter wheel gearing with friction speed feeding;
(5) start and focus on evaluation thread, the image array gathering is carried out to binary conversion treatment, and respectively along X-axis and Y-axis statistical study statistics bright spot number.When brightness approaches greatly, bright spot number is focus point when minimum.
Specifically, the detailed process that luma samples value is analyzed described in step (3) is:
If luma samples value is less than the threshold value setting, show not yet to arrive focal zone, controller transmits control signal to stepper motor, makes stepper motor drive lifter wheel rack gearing to drive objective table fast feed.When luma samples value is greater than the threshold value setting, show to approach focal zone, controller transmits control signal to stepper motor, drives lifter wheel rack gearing to drive the speed feeding of objective table to be inversely proportional to the brightness being collected.In the time that luma samples value approaches maximal value, objective table will be with the feeding of utmost point jogging speed, with the precision that guarantees to measure.
Concrete use procedure of the present invention is as follows:
Contact lens comprehensive detector of the present invention, according to practical measurement requirement, is provided with manual focusing knob 13 in riser guide 7 one sides, so this detector both can adopt manual mode to detect, can adopt again automated manner to detect.In the time adopting manual manipulation mode to measure eyeglass base arc radius-of-curvature, first eyeglass 4 to be measured is loaded on to object lens 3 below central points by the locating device on objective table 5, select 10X object lens, open the switch of collimating light pipe 2 interior LED light sources; Secondly objective table 5 is started from lower position to promote, the picture of observing three line rice word graticules by eyepiece 1 or computer screen, to the most clear position (distinguishable go out three straight lines), now resets digital dial gauge 11 to make zero; Again objective table 5 is continued to promote, eyepiece 1 or computer screen are observed the picture of rice word graticule again to the most clear position; Finally, read digital dial gauge 11 data, be eyeglass base arc radius-of-curvature to be measured.In the time adopting manual manipulation mode to measure lens surface quality, first eyeglass 4 to be measured is loaded on to object lens 3 below central points by locating device, select 2X object lens, open the switch of object below dark ground illumination light source 9; Secondly be adjusted to lens surface clear picture by microscope manual focusing knob 13, by eyepiece 1 or computer screen observation analysis lens surface quality.
In the time adopting automatic mode to measure the base arc radius of curvature measurement of eyeglass, first eyeglass 4 to be measured is loaded on to object lens 3 below central points by locating device; Then start and on computing machine, detect software, select base arc radius of curvature measurement function, pass through controller 14 control step motor 8 driving objective table 5 liftings by this software, and recording digital dial gauge 11 in the position of twice blur-free imaging by focusing on evaluation algorithms, its difference in height is base arc radius-of-curvature to be measured.In the time adopting automatic mode to measure the surface quality of eyeglass, first eyeglass 4 to be measured is loaded on to object lens 3 below central points by locating device, select 2X object lens, open the switch of object below transmitted light source 9; Then start on computing machine and detect software, select surperficial mass analysis function.By image analysis software, judge that according to the size and number of cut and fault whether its surface quality is qualified.
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection domain of the claims in the present invention book.
Claims (10)
1. a contact lens comprehensive detector, comprise eyepiece (1), object lens (3), objective table (5) and dial gauge (11), it is characterized in that: described eyepiece (1) is electronic eyepiece, between described eyepiece (1) and object lens (3), be provided with collimating light pipe (2), described dial gauge (11) is for being located at the digital dial gauge above objective table (5), described objective table (5) below is provided with jacking gear, and described jacking gear is provided with dark ground illumination device (9).
2. a kind of contact lens comprehensive detector according to claim 1, is characterized in that: described electronic eyepiece (1) is for adopting the electronic eyepiece of ccd image sensor or the electronic eyepiece of employing cmos image sensor.
3. a kind of contact lens comprehensive detector according to claim 1, it is characterized in that: described digital dial gauge (11) one end contacts by probe and the objective table (5) of digital dial gauge, and the other end is connected with controller (14) by signal wire.
4. a kind of contact lens comprehensive detector according to claim 1, is characterized in that: described jacking gear comprises the armstand (17) being fixed on base (10), the stepper motor (8) that is arranged on the guide rail (7) in armstand (17) and moves for driving objective table; On described guide rail (7), be equipped with can vertical displacement movement objective table (5); The input end of described stepper motor (8) is connected with the output terminal of controller (14), and output drives objective table (5) to make vertical displacement movement along guide rail by electromagnetic clutch (15) and rack-and-pinion lifting actuator (6).
5. a kind of contact lens comprehensive detector according to claim 2, is characterized in that: described electronic eyepiece (1) is connected with panel computer (12) by usb data line.
6. a kind of contact lens comprehensive detector according to claim 5, is characterized in that: described controller (14) is connected with panel computer (12) by signal wire.
7. a kind of contact lens comprehensive detector according to claim 5, is characterized in that: described riser guide (7) adopts decussation roller guide rail, and is symmetrically distributed on base (10).
8. a kind of contact lens comprehensive detector according to claim 8, is characterized in that: dark ground illumination device (9) is equipped with in objective table below, and described object lens (3) below is provided with LED oblique illumination device (16).
9. the focusing evaluation algorithms of a kind of contact lens comprehensive detector according to claim 1, is characterized in that: this algorithm comprises the following steps:
(1) by panel computer, luminance threshold and sampling time interval and space interval are set;
(2), according to sampling interval, panel computer drives electronic eyepiece to carry out real-time digital image collection, obtains luma samples value;
(3) by software, brightness value is sampled, and send different feeding instructions according to sampled result to controller;
(4) controller, according to feeding order-driven stepper motor and electromagnetic clutch, makes objective table with different directions and speed lifting by lifter wheel rack gearing;
(5) exceed between the lane place of threshold value in brightness, Survey Software starts focus analysis thread, the digital picture matrix gathering is carried out to binary conversion treatment, and carry out the analytic statistics of bright spot number along X-axis and Y-axis respectively, there is brightness feature the highest, that straight line is the thinnest according to image when the focus and focus on evaluation.
10. the focusing evaluation algorithms of a kind of contact lens comprehensive detector according to claim 9, is characterized in that: the detailed process according to luma samples value control lifting described in step (3) is:
If luma samples value is less than threshold value, show far away apart from focus position, therefore send fast feed instruction to controller, electromagnetic clutch adhesive, stepper motor makes objective table fast feed by F.F. gear train;
When luma samples value is greater than luminance threshold, show to approach focus region, calculate suitable speed of feed control step motor driving objective table lifting according to luma samples value; Brightness is higher, shows more to approach focus point, and feeding must be more slowly to guarantee measuring accuracy.
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| TWI787729B (en) * | 2021-02-03 | 2022-12-21 | 遠景光學股份有限公司 | How to take out contact lens lenses after inspection |
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Address after: 230088, 7 Dream Garden Road, hi tech Zone, Anhui, Hefei Applicant after: AUTEK CHINA INC. Address before: 230088, 7 Dream Garden Road, hi tech Zone, Anhui, Hefei Applicant before: OPPLE Technology (Hefei) Co., Ltd. Kang |
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Free format text: CORRECT: APPLICANT; FROM: ORTHO-K TECHNOLOGY (HEFEI) CO., LTD. TO: ORTHOK TECHNOLOGY CO., LTD. |
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