CN105938088A - Detection method and detection system for color defects of contact lenses - Google Patents
Detection method and detection system for color defects of contact lenses Download PDFInfo
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- CN105938088A CN105938088A CN201610229998.1A CN201610229998A CN105938088A CN 105938088 A CN105938088 A CN 105938088A CN 201610229998 A CN201610229998 A CN 201610229998A CN 105938088 A CN105938088 A CN 105938088A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
- G01N2021/9583—Lenses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
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- General Health & Medical Sciences (AREA)
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- Spectroscopy & Molecular Physics (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention relates to a detection method and detection system for color defects of contact lenses, wherein the detection method comprises the following steps: providing three detection light sources with different wavelengths at the same side of the contact lenses; providing a camera element at the other side, relative to the detection light sources, of the contact lenses; irradiating the contact lenses with the detection light sources respectively, shooting the contact lenses with the camera element, and respectively obtaining three corresponding images; respectively calculating the average gray scale value of each image; converting the average gray scale values of the three images into hue evaluation values; and comparing the hue evaluation values with a threshold value scope, to determine whether the contact lenses have the color defects. The detection method and detection system for the color defects of the contact lenses can effectively distinguish the color defects and foreign body defects on the contact lenses, and prevents from mistaking a good product into a defective product, so as to prevent increase of the production cost.
Description
Technical field
The present invention is related to a kind of flaw detection method being applied on contact lens and detecting system, especially
A kind of can effectively detect detection method and the detecting system whether on contact lens with color flaw.
Background technology
General after contact lens completes, can be via automatic optical detecting system (Automatic optical
Inspection system, AOI) carry out the color Defect Detection of contact lens.Color flaw refers to because of processing procedure
Upper variation is caused, and this kind of flaw cannot eliminate with external force for being formed directly on contact lens.Therefore,
When contact lens is once be tested with color flaw, i.e. it is judged as defective products.
But according to current detection mode, color flaw and foreign body flaw are difficult to distinguish, because both are being carried out
During automatic optics inspection, the image intercepted all shows stain, therefore cannot effectively distinguish this two kinds of flaws.
And according to the size of foreign body, some foreign body flaw is to be judged as non-defective unit, therefore can work as good when these
When the foreign body flaw of product is mistaken for color flaw, False Rate improves, and production cost will increase.
For color flaw and the detection of foreign body flaw, it is known that detection method is to use color digital camera or list
Contact lens is imaged by form and aspect machine, image then carries out eigenvalue computing and flaw differentiates, but this
Two kinds of methods are but respectively arranged with its shortcoming.
General color digital camera is that Baeyer filter (Bayer filter) is installed at charge coupled cell
On (Charge-coupled Device, CCD), by the way of optical filter, i.e. obtain chromatic image, due to
Baeyer filter is that every four pixels form a unit, and pixel filter red, a pixel filter blueness,
Two pixels filter green, utilize color value interpolation to obtain the actual value of each pixel, therefore capture the shadow arrived
As color meeting distortion and resolution are poor, therefore when differentiating color flaw and foreign body flaw, have erroneous judgement
Situation occurs.
And monochrome cameras can only sense the power of light and cannot differentiate color, its sensitivity, sharpness and contrast
Though degree relatively color digital camera is high, but its shortcoming be cannot effectively differentiate foreign body flaw on contact lens with
And color flaw.
Therefore, need exist for a kind of color flaw that can effectively differentiate contact lens and face foreign body flaw,
Avoid eyeglass to cause defective products to produce because of erroneous judgement during detection, and then improve production cost.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of color flaw inspection for detecting on contact lens
Survey method and detecting system, not only can retain sharpness and the contrast of image, can retain again the color of image
Information is effectively to distinguish the color flaw on contact lens and foreign body flaw, it is to avoid non-defective unit is mistaken for bad
Product, to reduce the cost scrapping defective products.
The present invention provides the detection method of the color flaw of a kind of contact lens, and it comprises the steps of (A) and carries
For have first wave length scope first detection light source, have second wave length scope second detection light source and
The 3rd detection light with wavelength range comes from the same side of contact lens；(B) provide imaging apparatus in this
Contact lens relative to this first detection light source, this second detection light source and the 3rd detection light source another
Side；(C) this first detection light source with first wave length scope is utilized to irradiate and irradiate this contact lens, and
With this imaging apparatus, this contact lens is imaged, to obtain the first corresponding image；Utilize this to have
Second detection light source of second wave length scope irradiates and irradiate this treats contact lens, hidden to this with this imaging apparatus
Shape glasses image, to obtain the second corresponding image；This is utilized to have the 3rd of wavelength range
Detection light source irradiates and irradiates this contact lens, and images this contact lens with this imaging apparatus, with
Obtain the 3rd corresponding image；(D) this first image, this second image and the 3rd image are calculated respectively
Average gray-scale value, the average gray-scale value of this first image, this second image and the 3rd image is turned by (E)
It is changed to form and aspect assessed value；And this form and aspect assessed value is compared by (F) with threshold value scope, to judge that this is treated
Whether detection contact lens has color flaw.
According to one embodiment of the present invention, the step (A) in contact lens detection method, this first wave length
Scope is 620nm to 750nm, and this second wave length scope is 495nm to 570nm, the 3rd wavelength
Scope is 450nm to 475nm.
According to one embodiment of the present invention, the step (B) in contact lens detection method, imaging apparatus is
Monochrome cameras.
According to one embodiment of the present invention, the step (E) in contact lens detection method, by average GTG
Value is converted to the method for form and aspect assessed value and can be changed by HSV color system or HSL color system.
The present invention also provides the detecting system of the color flaw of a kind of contact lens, comprising: carrier is in order to put
Put contact lens；Three detection light sources, it includes having first wave length scope in order to launching contact lens
The first detection light source, contact lens is launched the second detection light source and right with second wave length scope
Contact lens launches the 3rd detection light source with wavelength range；Imaging apparatus is respectively to should first
First detection light source of wave-length coverage, imaging apparatus is to absorb corresponding first to this contact lens to be detected
Image；To should second wave length scope second detection light source, imaging apparatus with to this contact lens absorb phase
Second image of correspondence；And to should the detection light source of wavelength range, imaging apparatus is with to stealthy eye
The 3rd image that mirror picked-up is corresponding；Computing element, it is coupled to this imaging apparatus, is somebody's turn to do in order to calculate respectively
First image, this second image and the average gray-scale value of the 3rd image；Conversion element, it is coupled to this meter
Calculate element, in order to the average gray-scale value of this first image, this second image and the 3rd image is converted to color
Phase assessed value；And comparison element, it is coupled to this conversion element, in order to by this form and aspect assessed value and threshold
Value scope is compared, to differentiate whether have color flaw on this contact lens to be detected.
According to one of present invention embodiment, the first wave length scope in contact lens detecting system is 620
Nm to 750nm, this second wave length scope is 495nm to 570nm, and this wavelength range is 450nm
To 475nm.
According to one embodiment of the present invention, the imaging apparatus in contact lens detecting system is monochrome cameras.
According to one embodiment of the present invention, the conversion element in contact lens detecting system can pass through HSV
Color system or HSL color system are changed.
According to one embodiment of the present invention, these three detection light sources are arranged at the same side of this contact lens.
According to one embodiment of the present invention, this imaging apparatus is arranged at this contact lens relative to these three inspections
The opposite side in light-metering source.
Compared with prior art, the color flaw detection method of contact lens proposed by the invention and detection system
System, can distinguish on contact lens and color flaw and foreign body flaw, it is to avoid be mistaken for not by non-defective unit effectively
Non-defective unit, causes production cost to improve.
By the technical characteristic further illustrating the present invention and the effect reached, with preferred embodiment and cooperation
After describing in detail such as.
Accompanying drawing explanation
For above and other objects of the present invention, feature, advantage can be become apparent with embodiment, appended
Graphic is described as follows:
Fig. 1 illustrates the schematic diagram of the contact lens detecting system according to one embodiment of the present invention.
Fig. 2 illustrates the flow chart of the contact lens detection method according to another embodiment of the present invention.
Detailed description of the invention
For the present invention aforementioned and other technology contents, feature and effect, know with reference to graphic in following cooperation
In the detailed description of preferred embodiment, can clearly present.
Referring to Fig. 1, it illustrates the signal of the contact lens detecting system according to one embodiment of the present invention
Figure.
As it is shown in figure 1, the contact lens detecting system 100 of the present invention include three detection light sources, carrier 40,
Imaging apparatus 50, computing element 60, conversion element 70 and comparison element 80, wherein, three detection light
Source is respectively provided with different wavelength range.
Three detection light sources being respectively provided with different wavelength range, respectively have the first of first wave length scope
Detection light source 10, there is the second detection light source 20 of second wave length scope and there is the of wavelength range
Three detection light sources 30, to launch corresponding light respectively to contact lens.Wherein, first wave length scope
For 620nm to 750nm, second wave length scope is 495nm to 570nm, and wavelength range is
450nm to 475nm.
As it is shown in figure 1, these three detection light sources can be simultaneously fixed on rotating disk 300, by rotating disk 300
Rotate and respectively contact lens 90 is launched light, but be not limited to this.One or more embodiment in the present invention
In, these three detection light sources are respectively redness detection light source, green test light source and blue detection light source,
Such as first detection light source 10 is red detection light source, and the second detection light source 20 is green test light source, the
Three detection light sources 30 are blue detection light source.
Carrier 40, it is in order to place contact lens 90, and carrier 40 shape can be circular arc or be rectangle, and
It is not limited to this.Carrier 40 generally arranges aqueous solution, it is to avoid contact lens 90 is deformed because of hydropenia.
Imaging apparatus 50, its in order to correspondence aforementioned have first wave length scope first detection light source 10, have
Second detection light source 20 of second wave length scope and there is the 3rd detection light source 30 of wavelength range
Scope, captures corresponding image to contact lens 90.Such as, imaging apparatus 50 correspondence has first wave
First detection light source 10 of long scope, absorbs the first corresponding image to contact lens 90；Imaging apparatus
50 correspondences have the second detection light source 20 of second wave length scope, and contact lens 90 absorbs corresponding the
Two images；Imaging apparatus 50 correspondence has the 3rd detection light source 30 of wavelength range, to contact lens
The 3rd image that 90 picked-ups are corresponding.
In one or more embodiment of the present invention, this imaging apparatus 50 can be such as charge coupled cell
(Charge-coupled Device, CCD) or tool complementary metal quasiconductor (Complementary Metal
Oxide Semiconductor, CMOS) camera.In one or more embodiment of the present invention, imaging apparatus
50 is charge-coupled device monochrome cameras.In one or more embodiment of the present invention, the first detection light source 10 is
Red detection light source, its corresponding irradiation contact lens 90, imaging apparatus 50 intercepts first to contact lens 90
Image；Then, the second detection light source 20 is green test light source, and it is corresponding that irradiate contact lens 90,
Imaging apparatus 50 intercepts the second image to contact lens 90；Finally, the 3rd detection light source 30 is blue detection
Light source, its corresponding irradiation contact lens 90, imaging apparatus 50 intercepts the 3rd image to contact lens 90.
Computing element 60, it is coupled to imaging apparatus 50, in order to calculate respectively the first image, the second image,
The average gray-scale value of the 3rd image.Namely the grey decision-making of each picture element in each image is added up, put down
The calculating of average.In one or more embodiment of the present invention, three detection light sources are respectively redness detection light
Source, green test light source and blue detection light source, absorb first through imaging apparatus 50 to contact lens 90
After image, the second image and the 3rd image, it is computed element 60, for example, computer, to calculate each image
Grey decision-making calculate, can get subsequently the red grey scale average value of corresponding first image, corresponding second image green
The grey scale average value of color and the blue grey scale average value of corresponding 3rd image.
Conversion element 70, it is coupled to this computing element 60, in order to by the average gray-scale value of aforementioned first image,
The average gray-scale value of the second image, the average gray-scale value of the 3rd image are converted to form and aspect assessed value.The side of conversion
Formula such as can pass through HSV color system or HSL color system, and wherein H represents that form and aspect (Hue), S represent
Saturation (Saturation), V represent that lightness (Value), L represent brightness L (Lightness).Such as pass through
When HSV color system is changed, its conversion formula is as follows:
In above formula, h is form and aspect assessed value, and r represents red grey decision-making, and g represents green grey decision-making,
B represents blue grey decision-making, and max represents the maximum in r, g, b, and min represents in r, g, b
Reckling.This h value is in the range of 0 to 360.
Aforementioned conversion element 70 can in be stored in computer program product, when computer be loaded into this formula and perform after,
This step can be completed.
Comparison element 80, it is coupled to conversion element 70, in order to form and aspect assessed value and threshold value are compared,
To differentiate, on contact lens 90, whether there is color flaw.Threshold value production method in comparison element 80 can
Test gained according to testing staff and preset, be not limited with arbitrary ad hoc approach, and this threshold value can be pre-
The built-in memory body that is first stored in comparison element 80 (figure does not illustrates), or in be stored in computer program product,
After computer is loaded into this formula and performs, this step can be completed.
Then, see also Fig. 1 and Fig. 2, Fig. 2 and illustrate the stealthy eye according to one embodiment of the present invention
Flow process Figure 200 of mirror detection method.
In step S21, it is provided that three detection light sources, three detection light sources respectively have first wave length scope
The first detection light source 10, there is the second detection light source 20 and have wavelength range of second wave length scope
The 3rd detection light source 30, three detection light sources are arranged at the same side of contact lens 90.Wherein, first wave
Long scope is 620nm to 750nm, and second wave length scope is 495nm to 570nm, the 3rd wavelength model
Enclose for for 450nm to 475nm.
In step S22, it is provided that imaging apparatus 50 in contact lens 90 relative three detection light sources another
Side (or opposition side).This imaging apparatus can be such as charge coupled cell (Charge coupled Device,
CCD) or tool complementary metal quasiconductor (Complementary Metal Oxide Semiconductor,
CMOS) camera.In one or more embodiment of the present invention, imaging apparatus is charge-coupled device monochrome phase
Machine.
In step S23, the light source of each wave-length coverage is utilized to irradiate contact lens respectively, by imaging apparatus pair
Contact lens carries out imaging to obtain three different images, concrete such as, utilize and there is first wave length scope
The first detection light source 10 irradiate the contact lens 90 that is positioned in carrier 40, and by imaging apparatus 50 to hidden
Shape glasses 90 image, to obtain the first corresponding image；Then, recycling has second wave length model
The the second detection light source 20 enclosed irradiates the contact lens 90 being positioned in carrier 40, and carries out contact lens 90
Shooting, to obtain the second corresponding image；Finally, the 3rd with wavelength range is utilized to detect light
The contact lens 90 being positioned in carrier 40 is irradiated in source 30, and images contact lens 90, to obtain phase
The 3rd corresponding image.
In step S24, respectively the first image, the second image and the 3rd image are carried out by computing element 60
The computing of average gray-scale value, namely adds up the grey decision-making of each picture element in each image, and be averaged value
Calculating.In one or more embodiment of the present invention, computing element 60 can comprise computer.
In step S25, by conversion element 70, the average gray-scale value of three images is converted to form and aspect assessed value.
The mode of conversion such as can pass through HSV color system or HSL color system.
In step S26, by comparison element 80, form and aspect assessed value is compared with threshold value, to judge to be somebody's turn to do
Whether contact lens to be detected has color flaw.The setting of threshold value can be according to the experiment gained of testing staff
It is set, however it is not limited to ad hoc approach.When form and aspect assessed value falls within the range of threshold value, then it represents that treat
Detection contact lens has foreign body flaw.Otherwise, in the range of form and aspect assessed value does not falls within this threshold value, i.e.
More than the upper limit of threshold value scope or less than threshold value lower limit, then it represents that contact lens to be detected has the color flaw
Defect.
Being experimentally confirmed, the present invention utilizes above-mentioned detection method and detecting system to 8 stealthy eyes to be detected
Mirror detects, and the detection light source used is respectively redness detection light source, green test light source and blueness
Detection light source.When irradiating contact lens to be detected first by redness detection light source, imaging apparatus is truncated to phase
The first corresponding image；When being then used by green light source irradiation contact lens to be detected, imaging apparatus absorbs
The second corresponding image；When finally using blue-light source to irradiate contact lens to be detected, imaging apparatus intercepts
To the 3rd corresponding image, the average gray-scale value of each image calculates as shown in table 1.Then, HSV is passed through
These three average gray-scale value are converted into form and aspect assessed value, then enter with default threshold value scope by color system
Row comparison, between predetermined threshold level scope for example, 40 to 300.
When form and aspect assessed value falls within the range of 40 to 300, then it represents that contact lens to be detected has the foreign body flaw
Defect.Otherwise, when form and aspect assessed value is less than or equal to 40 or more than or equal to 300, then it represents that contact lens to be detected
There is color flaw.
Table one:
From the above, according to color flaw detection method and the detecting system of contact lens proposed by the invention,
Can effectively distinguish on contact lens and color flaw and foreign body flaw, it is to avoid non-defective unit is mistaken for defective products,
Production cost is caused to improve.
Although the present invention is disclosed above with preferred embodiment, so it is not limited to the present invention.The present invention
Art has usually intellectual, without departing from the spirit and scope of the present invention, each when making
The change planted and retouching.Therefore, protection scope of the present invention is when depending on appended the defined person of claim
It is as the criterion.
Claims (10)
1. the detection method of the color flaw of a contact lens, it is characterised in that this detection method include with
Lower step:
(A) the second detection that provide the first detection light source with first wave length scope, there is second wave length scope
Light source and there is the 3rd detection light of wavelength range come from the same side of contact lens；
(B) provide imaging apparatus in this contact lens relative to this first detection light source, this second detection light source
And the 3rd detection light source opposite side；
(C) this first detection light source with first wave length scope is utilized to irradiate this contact lens, and with this shooting
This contact lens is imaged by element, to obtain the first corresponding image；
(D) this second detection light source with second wave length scope is utilized to irradiate this contact lens, and with this shooting
This contact lens is imaged by element, to obtain the second corresponding image；
(E) this 3rd detection light source with wavelength range is utilized to irradiate this contact lens, and with this shooting
This contact lens is imaged by element, to obtain the 3rd corresponding image；
(F) this first image, this second image and the average gray-scale value of the 3rd image are calculated respectively；
(G) average gray-scale value of this first image, this second image and the 3rd image is converted to form and aspect comment
Valuation；And
(H) this form and aspect assessed value is compared with threshold value scope, whether to judge this contact lens to be detected
There is color flaw.
2. detection method as claimed in claim 1, it is characterised in that in this first wave length model of step (A)
Enclosing for 620nm to 750nm, this second wave length scope is 495nm to 570nm, the 3rd wavelength model
Enclose for 450nm to 475nm.
3. detection method as claimed in claim 1, it is characterised in that this imaging apparatus in step (B) is
Monochrome cameras.
4. detection method as claimed in claim 1, it is characterised in that in step (E), this average GTG
Value is converted to the step of form and aspect assessed value and can be changed by HSV color system or HSL color system.
5. the detecting system of the color flaw of a contact lens, it is characterised in that this detecting system includes:
Carrier, it is in order to place contact lens；
Three detection light sources, it includes contact lens is launched first detection with first wave length scope
Light source, contact lens is launched the second detection light source and send out contact lens with second wave length scope
Injection has the 3rd detection light source of wavelength range；
Imaging apparatus, this imaging apparatus detects light source, with to this to first should with first wave length scope
The first image that contact lens picked-up is corresponding；This imaging apparatus is to having the second of second wave length scope
Detection light source, with second image corresponding to the picked-up of this contact lens；And this imaging apparatus is to should
3rd detection light source of wavelength range, with threeth image corresponding to the picked-up of this contact lens；
Computing element, it is coupled to this imaging apparatus, in order to calculate this first image, this second image respectively
And the 3rd average gray-scale value of image；
Conversion element, it is coupled to this computing element, in order to by this first image, this second image and this
The average gray-scale value of three images is converted to form and aspect assessed value；And
Comparison element, it is coupled to this conversion element, in order to this form and aspect assessed value and threshold value scope to be carried out
Comparison, to differentiate whether have color flaw on this contact lens to be detected.
6. detecting system as claimed in claim 5, it is characterised in that this first wave length scope is 620nm
To 750nm, this second wave length scope is 495nm to 570nm, and this wavelength range is 450nm
To 475nm.
7. detecting system as claimed in claim 5, it is characterised in that this imaging apparatus is monochrome cameras.
8. detecting system as claimed in claim 5, it is characterised in that this conversion element can pass through HSV
Color system or HSL color system are changed.
9. detecting system as claimed in claim 5, it is characterised in that these three detection light sources are arranged at this
The same side of contact lens.
10. detecting system as claimed in claim 9, it is characterised in that it is hidden that this imaging apparatus is arranged at this
Shape glasses are relative to the opposite side of these three detection light sources.
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| CN201610229998.1A CN105938088B (en) | 2016-04-14 | 2016-04-14 | The detection method and detection system of the color flaw of contact lenses |
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| CN201610229998.1A CN105938088B (en) | 2016-04-14 | 2016-04-14 | The detection method and detection system of the color flaw of contact lenses |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949970A (en) * | 2017-03-05 | 2017-07-14 | 常州恒方大高分子材料科技有限公司 | It is a kind of accurately to determine transparent and translucent polymer material color method |
| CN113155287A (en) * | 2021-04-27 | 2021-07-23 | 江苏汇鼎光学眼镜有限公司 | Spectacle lens color measuring device |
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