CN105938088B - The detection method and detection system of the color flaw of contact lenses - Google Patents
The detection method and detection system of the color flaw of contact lenses Download PDFInfo
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- CN105938088B CN105938088B CN201610229998.1A CN201610229998A CN105938088B CN 105938088 B CN105938088 B CN 105938088B CN 201610229998 A CN201610229998 A CN 201610229998A CN 105938088 B CN105938088 B CN 105938088B
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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
Abstract
Detection method and detection system of the present invention about a kind of color flaw of contact lenses, detection method includes the following steps: the detection light for providing three different wave lengths is derived from the same side of contact lenses；Photographing element is provided in the other side relative to those detection light sources of the contact lenses；It is utilized respectively the respectively detection light source and irradiates the contact lenses, and the contact lenses are imaged with the photographing element, obtain three corresponding images respectively；Calculate separately the average gray-scale value of the respectively image；The average gray-scale value of three images is converted into form and aspect assessed value；And compare the form and aspect assessed value with threshold value range, to judge whether the contact lenses have color flaw.The color flaw detection method and detection system of contact lenses proposed by the invention can effectively distinguish on contact lenses and color flaw and foreign matter flaw, avoid non-defective unit being mistaken for defective products, cause that increased production cost.
Description
Technical field
For the present invention about a kind of flaw detection method and detection system applied on contact lenses, especially one kind can
Effectively to detect the detection method and detection system whether on contact lenses with color flaw.
Background technique
It, can be via automatic optical detecting system (Automatic optical generally after contact lenses complete
Inspection system, AOI) Lai Jinhang contact lenses color Defect Detection.Color flaw refers to because of the institute that makes a variation on processing procedure
Caused by, such flaw is to be formed directly on contact lenses and can not be eliminated with external force.Therefore, when contact lenses once detect
When having color flaw out, that is, it is judged as defective products.
But according to current detection mode, color flaw is difficult to distinguish with foreign matter flaw, because the two is carrying out automatic light
When learning detection, the image intercepted all shows stain, therefore can not effectively distinguish this two kinds of flaws.And it is big according to the size of foreign matter
Small, some foreign matter flaws are can be judged as non-defective unit, therefore working as these can be when foreign matter flaws of non-defective unit be mistaken for color flaw
When, False Rate improves, and production cost just will increase.
Detection for color flaw and foreign matter flaw, it is known that detection method is using color digital camera or monochrome cameras
Contact lenses are imaged, characteristic value operation then is carried out to image and flaw differentiates, however this two methods but respectively has it
Disadvantage.
General color digital camera is that Baeyer filter (Bayer filter) is installed at charge coupled cell
On (Charge-coupled Device, CCD), i.e., chromatic image is obtained by way of optical filter, since Baeyer filter is
Every four pixels form a unit, a pixel filter red, a pixel filtering blue, two pixel filtering greens, benefit
With color value interpolation method to obtain the actual value of each pixel, therefore the image color captured can be distorted and resolution is poor, therefore
Generation the case where differentiating color flaw and when foreign matter flaw, having erroneous judgement.
And monochrome cameras can only incude the power of light and can not differentiate color, though sensitivity, sharpness and contrast compared with
Color digital camera is high, but its disadvantage is the foreign matter flaw and color flaw that can not effectively differentiate on contact lenses.
Therefore, a kind of color flaw and face foreign matter flaw that can effectively differentiate contact lenses is needed exist for, mirror is avoided
Piece causes defective products to generate because of erroneous judgement in the detection process, and then improves production cost.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of for detecting the color flaw detection method on contact lenses
And detection system, it can not only retain the sharpness and contrast of image, and the color information of image can be retained effectively to distinguish
Color flaw and foreign matter flaw on contact lenses, avoid non-defective unit from being mistaken for defective products, to reduce the cost for scrapping defective products.
The present invention provides a kind of detection method of the color flaw of contact lenses, and it includes following steps: (A) offer has
First detection light source of first wavelength range, second with second wave length range detect light source and have third wavelength range
Third detection light be derived from contact lenses the same side；(B) photographing element is provided in the contact lenses relative to first inspection
Survey the other side of light source, the second detection light source and third detection light source；(C) using this with first wavelength range the
One detection light source irradiates and irradiates the contact lenses, and is imaged with the photographing element to the contact lenses, opposite to obtain
The first image answered；It is irradiated using the second detection light source with second wave length range and irradiates this to contact lenses, with this
Photographing element images the contact lenses, to obtain corresponding second image；Using this with third wavelength range
Third detection light source irradiates and irradiates the contact lenses, and is imaged with the photographing element to the contact lenses, to obtain phase
Corresponding third image；(D) average gray-scale value of first image, second image and the third image, (E) are calculated separately
The average gray-scale value of first image, second image and the third image is converted into form and aspect assessed value；And (F) should
Form and aspect assessed value is compared with threshold value range, to judge whether the contact lenses to be detected have color flaw.
An embodiment according to the present invention, the step (A) in contact lenses detection method, the first wavelength range are
620nm to 750nm, the second wave length range are 495nm to 570nm, which is 450nm to 475nm.
An embodiment according to the present invention, the step (B) in contact lenses detection method, photographing element are monochromatic phase
Machine.
An embodiment according to the present invention, the step (E) in contact lenses detection method, average gray-scale value is converted
It can be converted by HSV color system or HSL color system for the method for form and aspect assessed value.
The present invention also provides a kind of detection system of the color flaw of contact lenses comprising: carrier is to place stealth
Glasses；Three detection light sources comprising contact lenses are launched with the first detection light source, right with first wavelength range
Contact lenses launch the second detection light source with second wave length range and launch contact lenses with third wavelength
The third of range detects light source；Photographing element respectively corresponds the first detection light source of the first wavelength range, and photographing element is with right
The contact lenses to be detected absorb corresponding first image；Second detection light source of the corresponding second wave length range, camera shooting member
Part is to absorb the second corresponding image to the contact lenses；And the detection light source of the corresponding third wavelength range, camera shooting member
Part is to absorb corresponding third image to contact lenses；Computing element is coupled to the photographing element, to calculate separately this
The average gray-scale value of first image, second image and the third image；Conversion element is coupled to the computing element, to
The average gray-scale value of first image, second image and the third image is converted into form and aspect assessed value；And element is compared,
It is coupled to the conversion element, the form and aspect assessed value and threshold value range to be compared, to differentiate the stealth to be detected
Whether there is color flaw on glasses.
One of according to the present invention embodiment, the first wavelength range in contact lenses detection system be 620nm extremely
750nm, the second wave length range are 495nm to 570nm, which is 450nm to 475nm.
An embodiment according to the present invention, the photographing element in contact lenses detection system are monochrome cameras.
An embodiment according to the present invention, the conversion element in contact lenses detection system can pass through HSV color system
System or HSL color system are converted.
An embodiment according to the present invention, this three detection light sources are set to the same side of the contact lenses.
An embodiment according to the present invention, the photographing element are set to the contact lenses relative to this three detection light sources
The other side.
Compared with prior art, the color flaw detection method and detection system of contact lenses proposed by the invention, can
It effectively distinguishes on contact lenses and color flaw and foreign matter flaw, avoids non-defective unit being mistaken for defective products, cause to be produced into
This raising.
The effect of to further illustrate technical characteristic of the invention and being reached, with preferred embodiment and cooperates detailed
Illustrate as after.
Detailed description of the invention
For above and other objects of the present invention, feature, advantage and embodiment can be clearer and more comprehensible, institute's accompanying drawings are said
It is bright as follows:
Fig. 1 is painted the schematic diagram of the contact lenses detection system according to one embodiment of the present invention.
Fig. 2 is painted the flow chart of the contact lenses detection method according to another embodiment of the present invention.
Specific embodiment
For the present invention aforementioned and other technology contents, feature and effect know preferable reality with reference to schema in following cooperation
It applies in the detailed description of example, can clearly present.
Referring to Fig. 1, its schematic diagram for being painted the contact lenses detection system according to one embodiment of the present invention.
As shown in Figure 1, contact lenses detection system 100 of the invention includes three detection light sources, carriers 40, photographing element
50, computing element 60, conversion element 70 and comparison element 80, wherein three detection light sources are respectively provided with different wavelength range.
Three are respectively provided with the detection light source of different wavelength range, respectively with the first detection light of first wavelength range
Source 10, the second detection light source 20 with second wave length range and the third with third wavelength range detect light source 30, with
Corresponding light is launched to contact lenses respectively.Wherein, first wavelength range is 620nm to 750nm, second wave length range
For 495nm to 570nm, third wavelength range is 450nm to 475nm.
As shown in Figure 1, this three detection light sources can be fixed on simultaneously on turntable 300, the rotation by turntable 300 is right respectively
Contact lenses 90 emit light, and but it is not limited to this.In one or more embodiments of the invention, this three detection light source difference
It is red detection light source for red detection light source, green test light source and blue detection light source, such as the first detection light source 10,
Second detection light source 20 is green test light source, and it is blue detection light source that third, which detects light source 30,.
Carrier 40, to place contact lenses 90,40 shape of carrier can be arc-shaped or be rectangle, however it is not limited to this.
Usually there is setting aqueous solution in carrier 40, contact lenses 90 is avoided to be deformed because of water shortage.
Photographing element 50 to aforementioned the first detection light source 10 with first wavelength range of correspondence, has the second wave
The range of second detection light source 20 of long range and the third detection light source 30 with third wavelength range, to contact lenses 90
Capture corresponding image.For example, the corresponding first detection light source 10 with first wavelength range of photographing element 50, to stealthy eye
Mirror 90 absorbs corresponding first image；The corresponding second detection light source 20 with second wave length range of photographing element 50, to hidden
Shape glasses 90 absorb corresponding second image；The corresponding third with third wavelength range of photographing element 50 detects light source 30,
Corresponding third image is absorbed to contact lenses 90.
In one or more embodiments of the invention, this photographing element 50 may be, for example, charge coupled cell (Charge-
Coupled Device, CCD) or tool complementary metal semiconductor (Complementary Metal Oxide
Semiconductor, CMOS) camera.In one or more embodiments of the invention, photographing element 50 is charge-coupled device list
Form and aspect machine.In one or more embodiments of the invention, the first detection light source 10 is red detection light source, and it is stealthy to correspond to irradiation
Glasses 90, photographing element 50 intercept the first image to contact lenses 90；Then, the second detection light source 20 is green test light source,
It corresponds to irradiation contact lenses 90, and photographing element 50 intercepts the second image to contact lenses 90；Finally, third detects light source 30
For blue detection light source, irradiation contact lenses 90 are corresponded to, photographing element 50 intercepts third image to contact lenses 90.
Computing element 60 is coupled to photographing element 50, to calculate separately the first image, the second image, third image
Average gray-scale value.Namely the grayscale value of each picture element in each image is added up, carries out the calculating of average value.In the present invention
One or more embodiments in, three detection light sources are respectively red detection light source, green test light source and blue detection light
Source is computed element 60 after photographing element 50 absorbs the first image, the second image and third image to contact lenses 90,
For example, computer is calculated with calculating each image gray scale value, can then obtain red grey scale average value, the correspondence of corresponding first image
The grey scale average value of the grey scale average value of the green of second image and the blue of corresponding third image.
Conversion element 70 is coupled to the computing element 60, to by the average gray-scale value of aforementioned first image, the second shadow
The average gray-scale value of picture, the average gray-scale value of third image are converted to form and aspect assessed value.The mode of conversion can for example pass through HSV color
Color system or HSL color system, wherein H indicates that form and aspect (Hue), S indicate that saturation degree (Saturation), V indicate lightness
(Value), L indicates brightness L (Lightness).Such as when being converted by HSV color system, conversion formula is as follows:
In above formula, h is form and aspect assessed value, and r indicates that red grayscale value, g indicate that the grayscale value of green, b indicate blue
Grayscale value, max indicate r, g, b in the maximum, min indicate r, g, b in reckling.The range of this h value is 0 to 360.
Aforementioned conversion element 70 interior can be stored in computer program product, achievable after computer is loaded into the formula and executes
This step.
Element 80 is compared, conversion element 70 is coupled to, form and aspect assessed value and threshold value to be compared, to differentiate
Whether there is color flaw on contact lenses 90.Gained can be tested according to testing staff by comparing the threshold value production method in element 80
And preset, it is not limited with any ad hoc approach, and this threshold value can be pre-stored in the built-in note compared in element 80
Recall body (figure be not painted) or it is interior be stored in computer program product, after computer is loaded into this formula and executes, this achievable step.
Then, the contact lenses detection side according to one embodiment of the present invention is painted also referring to Fig. 1 and Fig. 2, Fig. 2
The flow chart 200 of method.
In step S21, three detection light sources are provided, three detection light sources are respectively first inspection with first wavelength range
It surveys light source 10, the second detection light source 20 with second wave length range and the third with third wavelength range and detects light source 30,
Three detection light sources are set to the same side of contact lenses 90.Wherein, first wavelength range is 620nm to 750nm, second wave length
Range is 495nm to 570nm, and third wavelength range is 450nm to 475nm.
In step S22, it is (or opposite in the other side of opposite three detections light source of contact lenses 90 to provide photographing element 50
Side).This photographing element may be, for example, charge coupled cell (Charge-coupled Device, CCD) or tool complementary metal half
The camera of conductor (Complementary Metal Oxide Semiconductor, CMOS).In one or more realities of the invention
It applies in example, photographing element is charge-coupled device monochrome cameras.
In step S23, contact lenses are irradiated respectively using the light source of each wave-length coverage, by photographing element to contact lenses
It is imaged to obtain three different images, it is specific for example, being shone using the first detection light source 10 with first wavelength range
The contact lenses 90 being located in carrier 40 are penetrated, and contact lenses 90 are imaged by photographing element 50, it is corresponding to obtain
The first image；Then, the second detection irradiation of light source 20 with second wave length range is recycled to be located at the stealth in carrier 40
Glasses 90, and contact lenses 90 are imaged, to obtain corresponding second image；Finally, using having third wavelength model
The third detection irradiation of light source 30 enclosed is located at the contact lenses 90 in carrier 40, and images to contact lenses 90, to obtain
Corresponding third image.
In step S24, average grayscale is carried out to the first image, the second image and third image respectively by computing element 60
The operation of value, that is, the grayscale value of each picture element in each image is added up, carry out the calculating of average value.Of the invention one
Or in multiple embodiments, computing element 60 may include computer.
In step S25, the average gray-scale value of three images is converted into form and aspect assessed value by conversion element 70.Conversion
Mode can for example pass through HSV color system or HSL color system.
In step S26, form and aspect assessed value is compared with threshold value by element 80 is compared, to judge that this is to be detected hidden
Whether shape glasses have color flaw.The setting of threshold value can be set obtained by the experiment according to testing staff, however it is not limited to
Ad hoc approach.In the range of form and aspect assessed value falls within threshold value, then it represents that contact lenses to be detected have foreign matter flaw.Instead
It greater than the upper limit of threshold value range or is less than threshold value lower limit, then when form and aspect assessed value is not fallen within the scope of this threshold value
Indicate that contact lenses to be detected have color flaw.
It is experimentally confirmed, the present invention carries out 8 contact lenses to be detected using above-mentioned detection method and detection system
Detection, used detection light source are respectively red detection light source, green test light source and blue detection light source.It uses first
When red detection light source irradiates contact lenses to be detected, photographing element is truncated to corresponding first image；Then using green
When light source irradiates contact lenses to be detected, photographing element intake to corresponding second image；Finally irradiated using blue-light source
When contact lenses to be detected, photographing element is truncated to corresponding third image, and the average gray-scale value of each image is calculated such as 1 institute of table
Show.Then, by HSV color system, this three average gray-scale values are converted into form and aspect assessed value, then with preset threshold value model
It encloses and is compared, predetermined threshold level range is, for example, between 40 to 300.
When form and aspect assessed value is fallen in the range of 40 to 300, then it represents that contact lenses to be detected have foreign matter flaw.Instead
It, 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 lenses to be detected have color flaw.
Table one:
It from the above, can be effective according to the color flaw detection method and detection system of contact lenses proposed by the invention
Ground distinguishes on contact lenses and color flaw and foreign matter flaw, avoids non-defective unit being mistaken for defective products, production cost is caused to mention
It is high.
Although the present invention has been disclosed as a preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, protection scope of the present invention is subject to the appended claim institute defender of view.
Claims (8)
1. a kind of detection method of the color flaw of contact lenses, which is characterized in that detection method includes the following steps for this:
(A) provide with first wavelength range first detection light source, with second wave length range second detect light source and
Third detection light with third wavelength range is derived from the same side of contact lenses；
(B) provide photographing element in the contact lenses relative to the first detection light source, the second detection light source and this
The other side of three detection light sources；
(C) the first detection light source using this with first wavelength range irradiates the contact lenses, and with the photographing element to this
Contact lenses are imaged, to obtain corresponding first image；
(D) the second detection light source using this with second wave length range irradiates the contact lenses, and with the photographing element to this
Contact lenses are imaged, to obtain corresponding second image；
(E) the third detection light source using this with third wavelength range irradiates the contact lenses, and with the photographing element to this
Contact lenses are imaged, to obtain corresponding third image；
(F) average gray-scale value of first image, second image and the third image is calculated separately；
(G) average gray-scale value of first image, second image and the third image is converted into form and aspect assessed value；And
(H) the form and aspect assessed value is compared with threshold value range, to judge whether the contact lenses to be detected have color
Flaw；
Wherein, the conversion formula for which being converted to the form and aspect assessed value is as follows:
In above formula, h is the form and aspect assessed value, and r indicates that red grayscale value, g indicate that the grayscale value of green, b indicate blue
Grayscale value, max indicate that the maximum in r, g, b, min indicate the reckling in r, g, b, and the range of h value is 0 to 360.
2. detection method as described in claim 1, which is characterized in that in step (A) the first wavelength range be 620nm extremely
750nm, the second wave length range are 495nm to 570nm, which is 450nm to 475nm.
3. detection method as described in claim 1, which is characterized in that in step (B) the photographing element be monochrome cameras.
4. a kind of detection system of the color flaw of contact lenses, which is characterized in that the detection system includes:
Carrier, to place contact lenses；
Three detection light sources comprising to contact lenses launch with first wavelength range first detection light source, to stealth
Glasses launch the second detection light source with second wave length range and launch contact lenses with third wavelength range
Third detect light source；
Photographing element, which corresponds to the first detection light source with first wavelength range, to take the photograph to the contact lenses
Take corresponding first image；The photographing element corresponds to the second detection light source with second wave length range, to the stealth
Glasses absorb corresponding second image；And the photographing element corresponds to the third detection light source of the third wavelength range, with right
The contact lenses absorb corresponding third image；
Computing element is coupled to the photographing element, to calculate separately first image, second image and the third image
Average gray-scale value；
Conversion element is coupled to the computing element, to being averaged first image, second image and the third image
Grayscale value is converted to form and aspect assessed value；And
Element is compared, the conversion element is coupled to, the form and aspect assessed value and threshold value range to be compared, to differentiate
Whether there is color flaw on the contact lenses to be detected；
Wherein, the conversion formula for which being converted to the form and aspect assessed value is as follows:
In above formula, h is the form and aspect assessed value, and r indicates that red grayscale value, g indicate that the grayscale value of green, b indicate blue
Grayscale value, max indicate that the maximum in r, g, b, min indicate the reckling in r, g, b, and the range of h value is 0 to 360.
5. detection system as claimed in claim 4, which is characterized in that the first wavelength range is 620nm to 750nm, this
Two wave-length coverages are 495nm to 570nm, which is 450nm to 475nm.
6. detection system as claimed in claim 4, which is characterized in that the photographing element is monochrome cameras.
7. detection system as claimed in claim 4, which is characterized in that this three detection light sources are set to the same of the contact lenses
Side.
8. detection system as claimed in claim 7, which is characterized in that the photographing element is set to the contact lenses relative to this
The other side of three detection light sources.
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| CN106949970B (en) * | 2017-03-05 | 2018-08-24 | 常州恒方大高分子材料科技有限公司 | A method of accurately measuring transparent and translucent polymer material color |
| CN113155287B (en) * | 2021-04-27 | 2022-10-21 | 江苏汇鼎光学眼镜有限公司 | Spectacle lens color measuring device |
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