CN208621296U - A kind of optimal resolution color matching instrument of color difference - Google Patents
A kind of optimal resolution color matching instrument of color difference Download PDFInfo
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- CN208621296U CN208621296U CN201821011259.6U CN201821011259U CN208621296U CN 208621296 U CN208621296 U CN 208621296U CN 201821011259 U CN201821011259 U CN 201821011259U CN 208621296 U CN208621296 U CN 208621296U
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Abstract
The utility model belongs to machine vision light source light distribution technical field, discloses a kind of optimal resolution color matching instrument of color difference.Including image processing system, light source controller, black and white industrial camera, dome light source and platform, dome light source includes red-light source, green-light source and blue light source, platform includes base platform and mobile platform, described image processing system and mobile platform are each attached on base platform, bracket is put in the top of mobile platform, the fixed dome light source of the bracket, the camera lens of the black and white industrial camera is coaxially mounted to the top of dome light source, the dome light source forms reflected light by dome, and the reflected light is irradiated on mobile platform；The light source controller is connect with image processing system, image processing system includes image capture module and colour temperature computing module, the input terminal of the light source controller is connect with dome light source, the output end of the light source controller is connect with image capture module, and the black and white industrial camera is connected to image capture module.
Description
Technical field
The utility model belongs to machine vision light source light distribution technical field, more particularly, to a kind of optimal resolution of color difference
Color matching instrument.
Background technique
Currently, the process of field of machine vision core the most is the acquisition and processing of image, picture quality is to whole view
Feel system is extremely crucial.The selection of light source is the emphasis that whole image acquisition system quality is influenced from physical layer, if choosing uncomfortable
When light source then increase so that area-of-interest (ROI, hereinafter referred to as foreground area) and background area obtain optimal separation in image
The difficulty of image processing algorithm segmentation, identification is added, while the precision of system positioning and measurement can not be improved.Utilization prospects and back
The colour development difference of both scapes may be implemented prominent prospect and inhibit background, and traditional method is to choose region of interest with color parameter
Domain means directly such as carry out region segmentation, the method to the effect taken pictures with colored industrial camera configuration white light source
It is poor to differentiate color difference ability.Or by purchasing red, green, blue, white four color light source of standard machine vision, then illumination is built respectively
System carries out the mode that measurement compares artificial repeatedly and realizes.However 4 kinds of monochromatic one of which of artificial selection, it is arbitrated with result
It is bad, and this result is solid color.
Utility model content
In order to solve above-mentioned the shortcomings of the prior art and disadvantage, a kind of optimal resolution color matching instrument of color difference is provided.This is matched
Color instrument is the integral system of complete set realized comprising detection, calculating and optimal color matching, with quick, accurate, preceding
The distinguishable precision of scape background color difference is high, non-contact and low in cost etc. significant advantages.
The purpose of this utility model is realized by following technical proposals:
A kind of optimal resolution color matching instrument of color difference, including image processing system, light source controller, black and white industrial camera, dome
Light source and platform, the dome light source include red-light source, green-light source and blue light source, the platform include base platform and
Mobile platform, described image processing system and the mobile platform are each attached on the base platform, in the mobile platform
Top put bracket, the fixed dome light source of the bracket, the camera lens of the black and white industrial camera is coaxially mounted to described
The top of dome light source, the dome light source form reflected light by dome, and the reflected light is irradiated on the mobile platform；
The light source controller is connect with described image processing system, and described image processing system includes image capture module
With colour temperature computing module, the input terminal of the light source controller is connect with the dome light source, the output of the light source controller
End is connect with described image acquisition module, and the black and white industrial camera is connected to described image acquisition module.
Further, the light source controller is set there are three channel, including first passage, second channel and third channel,
The first passage is connect with the red-light source, and the second channel is connect with the green-light source, the third channel with
The blue light source connection.
Further, the red-light source, green-light source and blue light source are issued by LED light, the LED light setting point
Cloth is and coaxial with the camera lens of the black and white industrial camera on the same circumference in bottom of the dome light source.
Further, the mobile platform is provided with the knob that control testee is moved along x-axis, y-axis and z-axis direction,
Adjust the center that the knob makes testee appear in the black and white industrial camera imaging.
Further, further include colour temperature scaling board, fixture is installed on the mobile platform, the fixture offers pros
The groove of shape, the colour temperature scaling board are placed in the groove of the square and fix, and pass through the colour temperature computing module and demarcate
Parameter in image processing system.
Specifically, on the colour temperature scaling board be arranged standard red (255,0,0), standard green (0,255,0), standard blue (0,
0,255), four kinds of colors of standard white (255,255,255), four kinds of colors are square is uniformly distributed on colour temperature scaling board for this.
Compared with prior art, the utility model has the following beneficial effects:
1. the utility model is relative to traditional artificial selection light source polishing, the color matching instrument is comprising detecting, calculating and most
The integral system that excellent color matching is realized, with quick, accurate, the distinguishable precision of prospect background color difference is high, non-contact and low in cost
Etc. advantages greatly reduce cost of labor suitable for the automatic measurement of batch, improve production efficiency；Compared to traditional machine
Device visual illumination equipment applies special case for each, can design corresponding lighting source collocation, in a short time to reach
Optimum efficiency.
2. the utility model energy high degree reduces the measurement error generated by light source, and reduces image processing algorithm segmentation
And the difficulty of identification, achieve the purpose that the positioning of raising system and measurement accuracy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the colour temperature scaling board schematic diagram of the utility model.
Figure label explanation: 1- image processing system, 2- light source controller, 3- base platform, 4- mobile platform, 5- dome
Light source, 6- black and white industrial camera, 7- bracket, 8- fixture.
Specific embodiment
The content of the utility model is further illustrated combined with specific embodiments below, but should not be construed as to limit of the invention
System.
Instrument, including image processing system 1, light source controller 2, black and white work as shown in Figure 1, a kind of optimal resolution of color difference is matched colors
Industry camera 6, dome light source 5 and platform, the dome light source 5 include red-light source, green-light source and blue light source, the platform
Including base platform 3 and mobile platform 4, described image processing system 1 and the mobile platform 4 are each attached to the base platform
On 3, it is seated in aluminum profile bracket 7 in the top of the mobile platform 4, the fixed dome light source 5 of the bracket 7 is described black
The camera lens of white industrial camera 6 is coaxially mounted to the top of the dome light source 5, and the dome light source 5 is formed by dome to be reflected
Light, the reflected light are irradiated on the mobile platform 4；
The light source controller 2 is connect with described image processing system 1, and described image processing system 1 includes Image Acquisition
Module and colour temperature computing module, colour temperature computing module are the program of operation calibrating parameters (optimal coefficient of light source), Image Acquisition mould
Block runs the program taken pictures, and the input terminal of the light source controller 2 is connect with the dome light source 5, the light source controller 2
Output end is connect with described image acquisition module, and the black and white industrial camera 6 is connected to described image acquisition module, passes through black and white
Acquired image information is converted accessible image information by industrial camera 6.Colour temperature computing module is to collected information
The scheme of optimal color difference light distribution is obtained after carrying out operation, is exported optimal case using light source controller 2.
Further, the light source controller 2 is set there are three channel, including first passage, second channel and third channel,
The first passage is connect with the red-light source, and the second channel is connect with the green-light source, the third channel with
The blue light source connection.
Specifically, described image acquisition module is connect with black and white industrial camera 6 and light source controller 2, passes through black and white work
Acquired image information is converted accessible image information by industry camera 6.Wherein, light source controller 2 and dome light source 5 connect
It connects, the control feux rouges power supply line of first passage connection dome light source 5 in light source controller 2；Second channel connects in light source controller 2
Connect control green light power supply line in dome light source 5；The control blue light electricity of third channel connection dome light source 5 in light source controller 2
Source line.
Specifically, the red-light source, green-light source and blue light source are issued by LED light, the LED light setting distribution
On the same circumference in bottom of the dome light source 5, and it is coaxial with the camera lens of the black and white industrial camera 6.
Specifically, the knob that control testee is moved along x-axis, y-axis and z-axis direction is provided on the mobile platform 4,
Adjusting the knob makes testee appear in the center that the black and white industrial camera 6 is imaged.
Further, further include colour temperature scaling board, fixture 8 is installed on the mobile platform 4, the fixture 8 offers
The groove of square, the colour temperature scaling board are placed in the groove of the square and fix, and pass through the colour temperature computing module
Parameter in uncalibrated image processing system 1.
Specifically, on the colour temperature scaling board be arranged standard red (255,0,0), standard green (0,255,0), standard blue (0,
0,255), four kinds of colors of standard white (255,255,255), four kinds of colors are square is uniformly distributed on colour temperature scaling board for this,
As shown in Figure 2.
Before measurement, first colour temperature scaling board and test target are placed on solid in the groove for the square that the fixture 8 opens up
Fixed, the test target is placed below the colour temperature scaling board, makes colour temperature scaling board and test by adjusting the knob
Colour atla appears in the center that the black and white industrial camera 6 is imaged, by the colour temperature computing module uncalibrated image processing system 1
Parameter.It has demarcated again with the data of test target verifying calibration, has compared calibration result, make calibration result and test target phase
Closely.After calibration, colour temperature scaling board and test target are removed, testee is placed in the groove of the square solid
It is fixed, so that testee is appeared in the center that the black and white industrial camera 6 is imaged by adjusting the knob, dome light source 5 and
Black and white industrial camera 6 is in the top of testee.Dome light source 5, black and white industrial camera 6 and testee three fix, and lead to
It crosses black and white industrial camera 6 and carries out Image Acquisition, image is demarcated, it is easy to operate, it can be improved and highlight area-of-interest
Effect.Image processing system 1 obtains the background of testee and the color difference of area-of-interest by the color temperature change of dome light source,
The optimal light source package for highlighting area-of-interest is calculated, and testee is illuminated with this scheme, obtains optimal
Effect, i.e., the prospect of testee is most bright in black and white industrial camera 6 after polishing, and background is most dark.
The optimal test method for differentiating color matching instrument of the color difference, comprises the following specific steps that:
S1. according to the size adjusting black and white industrial camera of measured object and the relative position of testee, coarse adjustment mobile platform
Moved along x-axis, y-axis and z-axis direction, then finely tune black and white industrial camera lens focusing knob, until testee institute at
As clear；
S2. colour temperature scaling board is placed on mobile platform, adjusts light source controller, image processing system is demarcated；
S3. 2,4,8,16 or 32 are taken in image processing system as the spaced points for looping through the intensity of light source, are obtained
Alternative light source output intensity, i.e., when selecting any of the above number as intercycle, the light source of red, green, blue light source
Intensity is sequentially output the integral multiple digital for selection, until 255；
S4. the division for carrying out prospect and background to testee in image processing system, makes in image processing system
Mark out the prospect and background of measured object respectively with round, square, rectangle or oval drawing tool；
S5. test target is looped through using the spaced points in selecting step S3 as the intensity of light source in image processing system
In color, different colours and obtain the wherein optimal light of several groups as the foreground and background of testee using in test target
Source scheme；
S6. optimal coefficient of light source is calculated using three groups in step S5 optimal mixing light source package simultaneous, obtains empirical equation；
S7. the irradiation for carrying out three kinds of light of red, green, blue to testee on the basis of gained empirical equation, obtains respectively
The gray value of the foreground and background of measured object in three kinds of monochromatic light；
S8. it according to the gray value of the step S7 testee foreground and background obtained, calculates in three kinds of illumination of red, green, blue
It penetrates down, testee prospect gray value subtracts the measured object gray scale difference of measured object background gray levels；
S9. the measured object gray scale difference obtained according to step S8 calculates scheme and the output for highlighting optimal light source.
Specifically, step S3 also includes step in detail below:
S31: tri- value of R, G, B of all light sources is normalized, so that tri- value of R, G, B meets relationship R+G+B=1；Its
In, the light intensity of feux rouges when the R, G and B respectively indicate red light irradiation, the light intensity of green light when green light irradiates, blue light when blue light illumination
Light intensity；
S32: by tri- value of R, G, B respectively using Δ d as tolerance, constituting a first term is 0, the arithmetic progression that last item is 1, i.e. Rn
={ R1=0, R2,R3,...,Rn-1,Rn=1 }, Gn={ G1=0, G2,G3,...,Gn-1,Gn=1 }, Bn={ B1=0, B2,
B3,...,Bn-1,Bn=1 }；Wherein, the normalization coefficient at Δ d expression light source interval, selectable value 2/255,4/255,8/255,
16/255 or 32/255；Rn、GnAnd BnResulting light intensity value is normalized when being illustrated respectively in feux rouges, green light, blue light illumination；
S33: while R+G+B=1 is utilized, the element in R, G, B ordered series of numbers is arranged, several R, G, B ratios are constituted,
R, G, B is set to meet following relationship: Rn:Gn:Bn=x:y:(1-x-y), n group R, G, B ratio is obtained after this step；Wherein, x
Indicate the ratio of the total output intensity of red light component Zhan, y indicates the ratio of the total output intensity of green component Zhan, and (1-x-y) indicates blue
The ratio of the total output intensity of light Zhan, 1≤n≤765；
S34: in the case where gained n group R, G, B ratio, 255 × 3=765 of light-source brightness is divided into m section (m=
N, 1≤m≤765), a certain numerical value c is chosen in any brightness section [A, B] as the benchmark in interval computation R, G and B,
So that Rm+Gm+Bm=c, wherein 0≤A≤255,0≤B≤255；
S35: by R in step S34m+Gm+BmR in=c and step S33n:Gn:Bn=x:y:(1-x-y) simultaneous solution, it can obtain
Rm=x*c, Gm=y*c, Bm=(1-x-y) * c, can calculate in brightness section [A, B] R of the alternative light source of m group,
G, B value filters out m*n kind light source as alternative light source in entire light-source brightness section and configures.
Specifically, step S5 also includes step in detail below:
S51: test target is placed in the fixture on mobile platform, the prospect of measured object is selected in image processing system
For yellow, the background of measured object is red；
S52: the case where looping through m*n kind light source, the prospect for obtaining measured object is yellow, and the background of measured object is red
In the case of optimal light source, i.e., m*n kind mixing light source irradiation under choose measured object prospect gray value F- background gray levels G be
The case where maximum value, wherein 1≤n≤765,1≤m≤765；The red light component of optimal mixing light source used is R1, green light point
Amount is G1, blue light components B1；
S53: test target is placed in the fixture on mobile platform, the prospect of measured object is selected in image processing system
For yellow, the background of measured object is green；
S54: the case where looping through m*n kind light source, the prospect for obtaining measured object is yellow, and the background of measured object is green
In the case of optimal light source, i.e., m*n kind mixing light source irradiation under choose measured object prospect gray value F- background gray levels G be
The case where maximum value, wherein 1≤n≤765,1≤m≤765；The red light component of optimal mixing light source used is R2, green light point
Amount is G2, blue light components B2；
S55: test target is placed in the fixture on mobile platform, measured object prospect is selected in image processing system
For yellow, measured object background is blue；
S56: the case where looping through m*n kind light source, the prospect for obtaining measured object is yellow, and the background of measured object is blue
In the case of optimal light source, i.e., m*n kind mixing light source irradiation under choose measured object prospect gray value-background gray levels be most
Big value is optimal mixing light source, wherein 1≤n≤765,1≤m≤765；The red light component of optimal mixing light source used is
R3, green component G3, blue light components B3；
S57: three groups of optimal mixing light sources, i.e. R are selected from step S51-S561*a+G1*b+B1* c=1000, R2*a+G2*b+
B2* c=1000, R3*a+G3*b+B3* c=1000, wherein a, b, c are respectively the optimal coefficient of light source of feux rouges, green light, blue light.
Specifically, step S6 also includes method in detail below: three groups of optimal mixing light sources described in simultaneous step S57 are calculated
A, b and c out obtain empirical equation R*a+G*b+B*c=1000.
Specifically, step S7 also includes step in detail below:
S71: being only irradiated with feux rouges, the gray value of the foreground and background of measured object, R when obtaining red light irradiationf=RBefore*
Sr, Rb=RBack*Sr, wherein RBeforeThe prospect gray value of measured object, R when being red light irradiationBackThe background of measured object when being red light irradiation
Gray value, RfAnd RbThe foreground and background gray value of measured object when being the red light irradiation after being corrected respectively；
S72: being only irradiated with green light, the foreground and background gray value of measured object, G when obtaining green light irradiationf=GBefore*Sg,
Gb=GBack*Sg, wherein GBeforeThe prospect gray value of measured object, G when being green light irradiationBackThe background gray scale of measured object when being green light irradiation
Value, GfAnd GbThe foreground and background gray value of measured object when being the green light irradiation after being corrected respectively；
S73: being only irradiated with blue light, the foreground and background gray value of measured object, B when obtaining blue light illuminationf=BBefore*Sb,
Bb=BBack*Sb, wherein BBeforeThe prospect gray value of measured object, B when being blue light illuminationBackThe background gray scale of measured object when being blue light illumination
Value, BfAnd BbThe foreground and background gray value of measured object when being the blue light illumination after being corrected respectively.
Specifically, step S8 also includes step in detail below:
S81: respectively to the foreground and background for obtaining measured object in step S71-S73 through feux rouges, green light and blue light illumination
R, G and B value carries out difference calculating, can obtain Δ R=Rf-Rb, Δ G=Gf-Gb, Δ B=Bf-Bb；
S82: 255 are set by the corresponding spectral components of maximum value among Δ R, Δ G, Δ B, other two spectral components
The calculating of value empirically formula R*a+G*b+B*c=1000 determine；By a light in other two spectral components
Spectral component takes the spaced points of the searching loop intensity of light source in step S3 and its integral multiple to substitute into R*a+G*b+B*c=1000,
Calculate another corresponding spectral components.
Specifically, step S9 also includes step in detail below:
S91: energy theorem E=∫ I is obtained according to gray scale charge-coupled deviceLight sourceRObjectThe value of d σ calculating E, wherein E is electricity
The energy for the feux rouges that lotus coupled apparatus obtains, ILight sourceFor intensity of illumination, RObjectThe prospect gray scale for being measured object in the case where current light is penetrated
Value or background gray levels；
S92: by E=∫ I in step S91Light sourceRObjectD σ expansion can obtain E=IR×Rf+IG×Gf+IB×Bf-(IR×Rb-IG×
Gb-IB×Bb), i.e. m*n kind ILight sourceCorresponding m*n kind RObject, exportable m*n kind E；Wherein, 1≤n≤765,1≤m≤765, RfAnd Rb
The foreground and background gray value of measured object, G when being the red light irradiation after being corrected respectivelyfAnd GbIt is the green light after being corrected respectively
The foreground and background gray value of measured object, B when irradiationfAnd BbWhen being the blue light illumination after being corrected respectively before measured object
Scape and background gray levels；IR、IG、IBThe respectively intensity of illumination of feux rouges, green light and blue light；
S93: a maximum value E is obtained in the above m*n kind Emax, E at this timemaxIn Rm、Gm、Bm, as optimal output
Light source package；
S94: according to the light source package R of optimal outputm、GmAnd BmThree values are automatically turned on light source and are illuminated.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, combines and simplifies, and should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (6)
- The instrument 1. a kind of optimal resolution of color difference is matched colors, which is characterized in that including image processing system, light source controller, black and white industry Camera, dome light source and platform, the dome light source include red-light source, green-light source and blue light source, and the platform includes Base platform and mobile platform, described image processing system and the mobile platform are each attached on the base platform, in institute Bracket is put in the top for stating mobile platform, and the bracket fixes the dome light source, and the camera lens of the black and white industrial camera is coaxial It is mounted on the top of the dome light source, the dome light source forms reflected light by dome, and the reflected light is irradiated to described On mobile platform；The light source controller is connect with described image processing system, and described image processing system includes image capture module and color Warm computing module, the input terminal of the light source controller are connect with the dome light source, the output end of the light source controller with The connection of described image acquisition module, the black and white industrial camera are connected to described image acquisition module.
- The instrument 2. the optimal resolution of color difference according to claim 1 is matched colors, which is characterized in that there are three the light source controller is set Channel, including first passage, second channel and third channel, the first passage are connect with the red-light source, and described second Channel is connect with the green-light source, and the third channel is connect with the blue light source.
- The instrument 3. the optimal resolution of color difference according to claim 1 is matched colors, which is characterized in that the red-light source, green-light source It with blue light source is issued by LED light, the LED light setting is distributed on the same circumference in bottom of the dome light source, and with The camera lens of the black and white industrial camera is coaxial.
- The instrument 4. the optimal resolution of color difference according to claim 1 is matched colors, which is characterized in that the mobile platform is provided with control The knob that testee is moved along x-axis, y-axis and z-axis direction, adjusting the knob makes testee appear in the black and white industry The center of camera imaging.
- The instrument 5. the optimal resolution of color difference according to claim 1 is matched colors, which is characterized in that it further include colour temperature scaling board, it is described Fixture is installed, the fixture offers the groove of square, and the colour temperature scaling board is placed on the pros on mobile platform It is fixed in the groove of shape, pass through the parameter in the colour temperature computing module uncalibrated image processing system.
- The instrument 6. the optimal resolution of color difference according to claim 5 is matched colors, which is characterized in that mark is set on the colour temperature scaling board Standard is red, standard is green, four kinds of standard blue, standard white colors, and four kinds of colors are square to be uniformly distributed in the colour temperature scaling board On.
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| CN109060309A (en) * | 2018-06-28 | 2018-12-21 | 广东工业大学 | A kind of optimal resolution color matching instrument of color difference and its test method |
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| CN109060309B (en) * | 2018-06-28 | 2024-04-02 | 广东工业大学 | Color difference optimal resolution color matching instrument and testing method thereof |
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