CN103196559A - Electronic Lovibond color measurement method and detection system thereof - Google Patents
Electronic Lovibond color measurement method and detection system thereof Download PDFInfo
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Abstract
The invention discloses an electronic Lovibond detection system composed of a light-emitting diode (LED) light source, a color sensor, a cuvette, a microprocessor, a light source constant current controller, a switch power supply, a displayer, a key and a miniprinter. The color sensor is used for white balance correction. An electronic Lovibond color measurement method can convert red green blue into Lovibond color based on color component ratio and comprises the determination step and the measurement step. The system can obtain results from once color measurement, is quick in detection speed, is good in correlation with classic Lovibond method results, is compact in structure, low in cost, good in repeatability and stable in performance, can update and substrate the classic Lovibond detector and has wide application prospect. In addition, compared with the classic Lovibond method, the method has the advantages of being good in uniqueness of measurement results, effectively avoiding the existence of multiple Lovibond measurement results caused by visual error of manual work, and effectively improving objectivity and scientificity.
Description
Technical field
The present invention relates to electronics Lovibond colorimetry method and detection system thereof, relate in particular to the application color sensor, the LED stabilized light source carries out color measuring, and carries out method for measuring color and detection system thereof that Lovibond value color converts, belongs to and utilizes photoelectric detection technology field.
Background technology
19 century Britain color science worker Joseph Lovibonds propose Lovibond (Lovibond) color system.With the Lovibond color system be the instrument of measuring principle in the Lovibond tintmeter, be Lovibond relatively colour meter or Lovibond tint instrument again.
The Lovibond tintmeter is a kind of instrument that adopts visual method that object color is measured, and measurement result is the Lovibond color value.The Lovibond tintmeter is widely used in the color measuring of various colored liquids, as edible oil, lipid, syrup, beer, aqueous chemical articles for use etc.The Lovibond tintmeter is simple to operate, easy-to-understand, and is cheap, occupies monopoly position in market at present.
The Lovibond color system is different with RGB (RGB) color system: as three primary colors, the measuring method of Lovibond tintmeter is that testing sample and Lovibond standard color chips group are carried out colorimetric with R (red), Y (Huang), B (indigo plant).
Lovibond standard color chips comprises three kinds of red tab, erotic film, blue sheet, every kind of standard color chips that a series of scale values are arranged.By visual colorimetric determination, constantly adjust the different scale combinations of three kinds of color chips, finally make testing sample and Lovibond color chips combined colors in full accord.
The Lovibond value comprises two kinds of indexs: " match-on criterion value " and " performance color and luster ", " match-on criterion value " refer to the scale value of three kinds of color chips in measuring the color process; " performance color and luster " refers to the appearance luster of testee, just the color seen of human eye.For example, reading the combination of Lovibond color chips after certain sample is measured and finished is respectively red tab 5.5, erotic film 23.0, and 2.0 Lovibond values of blue sheet, " the match-on criterion value " of this sample is so: red 5.5, yellow 23.0, blue 2.0; And " performance color and luster " is: darkness 2.0, red 3.5, yellow 21.0, this color is called " dark yellow orange ".
The darkness of " performance color and luster " is numerical value minimum (going up in the example is 2.0) in three kinds of color chips, and Huang-red tertiary colour is orange, and in the Lovibond system, all colors are concluded has only six kinds, namely red, orange, yellow, green, blue, purple.Can also be divided into its segmentation: blood orange, yellow orange, yellowish green, bluish-green, purple, royal purple.Wherein, red, yellow, indigo plant is determined that by single color chips of planting orange, green, purple is determined by red-Huang, Huang-blue, red-blue two kinds of color chips respectively.
By above measuring process as can be known, Lovibond adopts the artificial visual method, must adjust the synthetic comparison of three kinds of Lovibond color chips color repeatedly, shortcoming is that complex operation, automaticity are low, color combination mode complexity, labour intensity is big, the manual measurement deviation is big, poor repeatability.In order to solve these shortcomings, existing two kinds of replacement color measuring methods: photoelectric integral method and spectrophotometric method.
The photoelectric integral method principle is simulation human eye tristimulus values characteristic, and the light that light source sends is mapped on the photodetector through passing through one group of tristimulus values optical filter behind the testing sample respectively, more tested color of light energy is carried out disposable integral measurement, obtains tristimulus values.
Optical filter carries out the colour filter correction to photodetector and lighting source, make it consistent with the relative spectral power distribution of ClE standard observer and standard illuminants respectively, optical filter need satisfy Luther condition, but in actual applications, can not accomplish to meet fully Luther condition, can only be similar to and meet.
Fixed and compensate problem in order to solve in the photoelectric integration colour examining process flashing, Chinese invention patent " digital photoelectric grease integration color detecting system and detection method thereof " (CN100458410C) discloses the digital photoelectric grease integration color detecting system that the Processing with Neural Network device is realized.
Spectrophotometric method is not directly measured the tristimulus values of color, but by measurement light source (standard sources of selecting for use CIE to recommend) spectral power distribution or object reflection or refract light spectral property, calculates the tristimulus values of color.
Spectrophotometric method mainly comprises monochromator and two devices of detector, by monochromator the complex light of light source is separated into single light beam, adjusts that the wavelength position of rule changes the wavelength of light that monochromator penetrates on the monochromator; The function of detector then is that the single light beam that monochromator is separated is carried out quantitative measurment, thereby obtains testing sample with respect to standard spectrum reflectivity (perhaps transmissivity) curve, tries to achieve the tristimulus values of color at last by integral and calculating.
More than two kinds of color measuring methods all adopt color separation to measure the principle of quadraturing again, synthesize the tristimulus values color system at last, She Ji commercial product has thus: the high precision spectrophotometer PFX195 of Britain Tintometer company, the online automatic spectrum color with oil color of the KC-560 analyzer of Japan's development.These instrument fetch long prices, the environmental requirement height, usable range is confined to factory or laboratory.
Another kind of technical scheme is to adopt the Computer Image Processing method, this method must find a best features value before each the measurement, operation is complicated, and operator's technical ability is had relatively high expectations, simultaneously image pixel is had relatively high expectations, need compensate just image and can obtain more satisfactory result.
Summary of the invention
Electronics Lovibond detection system of the present invention is used color sensor, the LED stabilized light source carries out color measuring, is made up of led light source, color sensor, cuvette, microprocessor, light source constant-current controller, Switching Power Supply, display, button, mini-printer.
Cuvette is between led light source and color sensor, testing sample is placed in the cuvette, the light that led light source sends sees through testing sample and arrives color sensor, led light source, cuvette and color sensor have constituted the measurement light path, for fear of the influence of surround lighting, measuring light path is the darkroom when detecting.
Color sensor is gathered the red, green, blue component value of testing sample, is sent to microprocessor and handles, and display shows the Lovibond value of measurement result, by the operation of key control detection system, mini-printer printout measurement result.
Switching Power Supply provides the galvanic current source for detection system, guarantee the electric current and voltage output that the light source constant-current controller is stable, and the light source constant-current controller provides stable constant-current supply output for led light source; Adopt the enhancing of light source constant-current controller to the control of the luminous degree of stability of led light source, to strengthen luminous degree of stability, improve the colour examining accuracy.
The used color sensor of electronics Lovibond detection system of the present invention is the red green blue tricolor color sensor, from redly, the light of green, blue color filtered sheet gating different colours, record the RGB color component value.Color sensor before using, module restarts, changes under the situation such as light source and carry out white balance, the adjustment color-ratio, concrete grammar is as follows:
The test tube of sky is placed on the color sensor top, a white light source is placed in empty test tube top, making incident light can pass test tube shines on the color sensor, gating redness, green and blue electric-wave filter successively, record three kinds of color component value, calculate each color component correction factor according to following formula:
R, G, B are respectively red, green, blue color component measured value, Ratio in the formula
R, Ratio
G, Ratio
BBe respectively red, green, the blue-correction factor.Color measuring updating formula as a result is:
R in the formula
Measured value, G
Measured value, B
Measured valueMeasured value for each color component behind each color measuring; R
After the correction, G
After the correction, B
After the correctionBe each color component value after proofreading and correct.The RGB color converts to adopt to the Lovibond color and proofreaies and correct back numerical value.
Electronics Lovibond colorimetry method of the present invention carries out the RGB color based on the color component ratio and converts to the Lovibond color.Color component ratio computing formula is as follows:
R in the formula
After the correction, G
After the correction, B
After the correctionNumerical value for each color component after the white balance correction; R%, g%, b% are each color component ratio, are used for calibration process and the measuring process of method for measuring color, adopt the color component ratio to replace the advantage of color component itself to be that measured value is not subjected to the influence of environmental light intensity and optical path length.
The flow process of electronics Lovibond colorimetry method of the present invention comprises two processes:
(1) calibration process: purpose is to set up Lovibond standard color chips at the corresponding relation of color component ratio coordinate system;
Step 1.1: select coordinate system, select r%-g% color component ratio coordinate system, perhaps r%-b% color component ratio coordinate system, perhaps b%-g% color component ratio coordinate system is wherein a kind of, be designated as the x%-y% coordinate system, satisfy x%, y% ∈ { r%, g%, b%}, and x%, the y% difference;
Step 1.2: measure all Lovibond reddish yellow color chips combinations, elder generation is the red color chips (value LR ∈ [0,79]) of Lovibond fixedly, the yellow color chips (value LY ∈ [0,79]) of Lovibond is gone in stack successively then, records that all Lovibonds are red, erotic film combination (LR, LY) (x%, y%) coordinate figure;
Step 1.3: measure all Lovibond reddish blue sheet combinations, elder generation is the red color chips (value LR ∈ [0,79]) of Lovibond fixedly, the blue color chips (value LB ∈ [0,49]) of Lovibond is gone in stack successively then, records red, the blue sheet combination of all Lovibonds (LR, LB) (x%, y%) coordinate figure;
Step 1.4: measure all Lovibond champac color chips combinations, elder generation is the yellow color chips (value LY ∈ [0,79]) of Lovibond fixedly, the blue color chips (value LB ∈ [0,49]) of Lovibond is gone in stack successively then, records all Lovibond Huangs, blue sheet combination (LY, LB) (x%, y%) coordinate figure;
Step 1.5: preserve coordinate figure, the combination of Lovibond standard color chips (x%, y%) coordinate figure deposits microprocessor or its tape storage in;
Calibration process is regularly carried out according to detecting instrument standard verification and relevant industries standard.
(2) measuring process: purpose is to measure each color component of sample, and is scaled the Lovibond value;
Step 2.1: measure each color component of sample;
Step 2.2: white balance correction;
Step 2.3: calculate the color component ratio: P (r%
Sample, g%
Sample, b%
Sample) point;
Step 2.4: select coordinate system, select the x%-y% color component ratio coordinate system identical with calibration process;
Step 2.5: find out adjacent four net points, in the x%-y% coordinate system, find out and surround four net point A(x% that P is ordered
A, y%
A), B (x%
B, y%
B), C (x%
C, y%
C) and D(x%
D, y%
D), respectively corresponding four Lovibond standard color chips combined value LA (the L α of these four net points
A, L β
A), LB (L α
B, L β
B), LC (L α
C, L β
C) and LD (L α
D, L β
D), label L α wherein, L β ∈ { LR, LY, LB}, and L α, L β difference;
Step 2.6: interpolation is estimated the Lovibond value, adopts interpolation algorithm to calculate the corresponding Lovibond combined value of P point
Wherein
With
Be the Lovibond estimated value;
Step 2.7: determine the 3rd Lovibond value.
In sum, the significant technique effect of the present invention is: electronization, robotization Lovibond detect, and only need a colour examining just can obtain the result, and detection speed is fast; Obtain the result with classical Lovibond method and have good correlativity; Compact conformation, cost are low, good reproducibility, stable performance, are the renewal substitute products of classical Lovibond detector, have broad application prospects.In addition, the present invention compares with classical Lovibond method, also have the good advantage of measurement result uniqueness, avoided effectively having improved objectivity and the science of Lovibond method for measuring color effectively because artificial vision's error causes the shortcoming that has a plurality of Lovibond measurement results.
Description of drawings
Fig. 1 is the system construction drawing of electronics Lovibond detection system of the present invention;
Fig. 2 is the color sensor functional schematic of electronics Lovibond detection system of the present invention;
Fig. 3 is the white balance process synoptic diagram of electronics Lovibond detection system of the present invention;
Fig. 4 is the process flow diagram of electronics Lovibond colorimetry method of the present invention;
Fig. 5 is the Lovibond standard color chips color component ratio coordinate diagram of electronics Lovibond colorimetry method of the present invention;
Fig. 6 is the interpolation synoptic diagram of electronics Lovibond colorimetry method of the present invention.
Embodiment
With reference to the accompanying drawings, describe the present invention below.
As shown in Figure 1, electronics Lovibond detection system of the present invention is made up of led light source (100), color sensor (101), cuvette (102), microprocessor (104), light source constant-current controller (105), Switching Power Supply (106), display (107), button (108), mini-printer (109).
Testing sample (103) is placed in the cuvette (102), cuvette (102) is between led light source (100) and color sensor (101), the light that led light source (100) sends sees through testing sample (103) and arrives color sensor (101), led light source (100), cuvette (102) and color sensor (101) have constituted measurement light path (110), influence for fear of surround lighting, measuring light path (110) is the darkroom when detecting, a kind of method for optimizing is to be enclosed in the light tight space measuring light path (110), and inwall covers the not reflective flannelette of one deck black.
Color sensor (101) is gathered the red, green, blue component value of testing sample (103), is sent to microprocessor (104) and handles, and is scaled the Lovibond value; The colorama able to programme that the preferred chip of color sensor (101) is TAOS (Texas Advanced Optoelectronic Solutions) company is to frequency converter TCS230 chip; The preferred chip of microprocessor (104) is 8051 single-chip microcomputer STC12C5A60S2 of macrocrystalline company.
Display (107) shows the Lovibond value of measurement result, and preferred version is three groups of three charactrons; The operation of button (108) control electronics Lovibond detection system of the present invention comprises three touch key-presss: start measurement, printing, white balance; Under the suitable situation of cost, also can adopt more friendly man-machine interface, but for example not only can show but also the touch-screen of touch-screen input is used for realizing showing and keypress function.
Information such as mini-printer (109) printout measurement result, Measuring Time, sample number into spectrum also can be connected to external printer output by the printer line, perhaps output to network printer output by network connection.
Switching Power Supply (106) provides the galvanic current source for electronics Lovibond detection system of the present invention, guarantee the electric current and voltage output that light source constant-current controller (105) is stable, and light source constant-current controller (105) provides stable constant-current supply output for led light source (100); Preferred constant-current driven chip PT4115, it is the step-down constant current source of a continuous electric inducing current conduction mode, can drive tens watts led light source (100).
Adopt light source constant-current controller (105) enhancing to the control of the luminous degree of stability of led light source (100); to improve the colour examining accuracy; it is one of the technology of the present invention feature; on this basis, adopting other any light sources such as incandescent lamp, Halogen lamp LED to substitute technology that led light sources (100) do changes and all should think and fall into protection scope of the present invention.
As shown in Figure 2, the color sensor of electronics Lovibond detection system of the present invention is the red green blue tricolor color sensor, and the colorama able to programme of preferred TAOS (Texas Advanced Optoelectronic Solutions) company is to the conversion chip TCS230 of frequency.
The sensitive piece of TCS230 chip (200) anthropomorphic dummy's eyes retina cell, each photosensitive unit (201) have respectively one redly filter plate (202), with green filter plate (203), band blue color filtered sheet (204) with not with the silicon photoelectric diode of filter plate (205), totally 16 groups of photosensitive units (201), optical filter (202) only allows ruddiness to pass through redly, be with green filter plate (203) only to allow green glow to pass through, band blue color filtered sheet (204) only allows blue light to pass through, and is not with filter plate (205) to allow all light to pass through.The even cross-distribution of these filter plates reduces incident light radiation unevenness to greatest extent, improves the degree of accuracy of color measuring.
Can not change the tone of color with filter plate (205), just influence the bright-dark degree of color.When light source is radiated on the object, arrive color sensor by reflected by objects or transmission, the different filter plates by gating TCS230 detect its red, green, blue component respectively, by being the light intensity linear transformation frequency signal, quantize the red, green, blue value, can obtain the color of object.
Because existing three primary colors color model is numerous; except RGB color model of the present invention; be outside the RGB color model; common also has: three primary colors color model such as YUV, YIQ, CMYK, YCbCr, XYZ, LCH, LAB, UCS, UVW; these models can be realized conversion mutually with the RGB color model; the art personnel adopt other color model and corresponding color sensor to realize the Lovibond color measuring; can't change entity of the present invention in fact, all should think to fall into protection scope of the present invention.
As shown in Figure 3, the white balance process is used for the measured deviation of each color component of balance color sensor (303).Theoretically, white is to be mixed by equivalent redness, green and blueness, but in fact, three primary colors and not exclusively equal in the white.No matter at the weather of sunny, haze or under LED, tungsten lamp, the white object that human eye is seen still is white, and this is because human eye can carry out self-adaptation, but color sensor (303) does not have this adaptive functions.
In order to press close to people's vision standard, color sensor (303) before using, module restarts, changes under the situation such as light source and carry out white balance, the adjustment color-ratio, concrete grammar is as follows:
The test tube (302) of sky is placed on color sensor (303) top, a white light source (301) is placed in empty test tube (302) top, making incident light can pass test tube shines on the color sensor (303), gating redness, green and blue electric-wave filter successively, record three kinds of color component value, calculate each color component ratio as correction factor according to following formula:
R, G, B are respectively red, green, blue color component measured value, Ratio in the formula
R, Ratio
G, Ratio
BBe respectively red, green, the blue-correction factor.Color measuring trimming process as a result is: color measuring (304), and white balance correction (305) obtains to proofread and correct back color (306), and formula is as follows:
R in the formula
Measured value, G
Measured value, B
Measured valueSurvey measurements for each component behind each color measuring; R
After the correction, G
After the correction, B
After the correctionNumerical value for each component after proofreading and correct.Numerical value after the RGB color is proofreaied and correct to Lovibond color conversion employing.
As shown in Figure 4, electronics Lovibond colorimetry method of the present invention carries out the RGB color space based on the color component ratio and converts to the Lovibond color space.Color component ratio computing formula is as follows:
R in the formula
After the correction, G
After the correction, B
After the correctionNumerical value for each color component after the white balance correction; R%, g%, b% are each color component ratio, are used for calibration process and the measuring process of method for measuring color, adopt the color component ratio to replace the advantage of color component itself to be that measured value is not subjected to the influence of environmental light intensity and optical path length.
The flow process of electronics Lovibond colorimetry method comprises two processes:
(1) calibration process, purpose are to set up Lovibond standard color chips at the corresponding relation of color component ratio coordinate system;
Step 1.1: select coordinate system (401), select r%-g% color component ratio coordinate system, perhaps r%-b% color component ratio coordinate system, perhaps b%-g% color component ratio coordinate system is wherein a kind of, is designated as the x%-y% coordinate system, satisfy x%, y% ∈ { r%, g%, b%}, and x%, the y% difference;
Step 1.2: measure all Lovibond reddish yellow color chips combinations (402), elder generation is red color chips (the value LR ∈ [0 of Lovibond fixedly, 79]), yellow color chips (the value LY ∈ [0 of Lovibond is gone in stack successively then, 79]), with reddish yellow record that all Lovibonds are red, erotic film combination (LR, LY) (x%, y%) coordinate figure;
Step 1.3: measure all Lovibond reddish blue sheet combinations (403), elder generation is red color chips (the value LR ∈ [0 of Lovibond fixedly, 79]), blue color chips (the value LB ∈ [0 of Lovibond is gone in stack successively then, 49]), record red, the blue sheet combination of all Lovibonds (LR, LB) (x%, y%) coordinate figure;
Step 1.4: measure all Lovibond champac color chips combinations (404), elder generation is yellow color chips (the value LY ∈ [0 of Lovibond fixedly, 79]), blue color chips (the value LB ∈ [0 of Lovibond is gone in stack successively then, 49]), record all Lovibond Huangs, the combination of blue sheet (LY, LB) (x%, y%) coordinate figure;
Step 1.5: preserve coordinate figure (405), the combination of Lovibond standard color chips (x%, y%) coordinate figure deposits microprocessor or its tape storage in;
Calibration process is regularly carried out according to detecting instrument standard verification and relevant industries standard.
(2) measuring process: purpose is to measure each color component of sample, and is scaled Lovibond color chips reading value;
Step 2.1: measure each color component of sample (406);
Step 2.2: white balance correction (407);
Step 2.3: calculate color component ratio (408): P (r%
Sample, g%
Sample, b%
Sample) point;
Step 2.4: select coordinate system (409), select the x%-y% color component ratio coordinate system identical with calibration process;
Step 2.5: find out adjacent four net points (410), in the x%-y% coordinate system, find out and surround four net point A (x% that P is ordered
A, y%
A), B (x%
B, y%
B), C (x%
C, y%
C) and D (x%
D, y%
D), respectively corresponding four Lovibond standard color chips combined value LA (the L α of these four net points
A, L β
A), LB (L α
B, L β
B), LC (L α
C, L β
C) and LD (L α
D, L β
D), label L α wherein, L β ∈ { LR, LY, LB}, and L α, L β difference;
Step 2.6: interpolation is estimated Lovibond value (411), adopts interpolation algorithm to calculate the corresponding Lovibond combined value of P point
Wherein
With
Be the Lovibond estimated value;
Step 2.7: determine the 3rd Lovibond value (412).
As shown in Figure 5, Lovibond standard color chips r%-g% color component ratio coordinate diagram, horizontal ordinate is red component ratio r%, ordinate is green component ratio g%, divides three zones: Lovibond champac color chips combination region (501), Lovibond reddish yellow color chips combination region (502), Lovibond reddish blue sheet combination region (503).
Yellow line (504) such as champac combination region is in the calibration process step 1.4 among the figure, and certain is the yellow value of Lovibond fixedly, and the curve of measuring and drawing during change Lovibond blue valve; Blue lines (505) such as champac combination region then are certain fixedly Lovibond blue valve, and change the curve of measuring and drawing when Lovibond is yellow to be worth.
Red line (506) such as reddish yellow combination region is in the calibration process step 1.2 among the figure, and certain is the Lovibond red value fixedly, and the curve of measuring and drawing during the yellow value of change Lovibond; Yellow lines (507) such as reddish yellow combination region then are certain fixedly yellow value of Lovibond, and measure during change Lovibond red value and the curve of drafting.
Blue line (508) such as red blue combination region is in the calibration process step 1.3 among the figure, and certain is the Lovibond blue valve fixedly, and the curve of measuring and drawing during change Lovibond red value; Red lines such as red blue combination region (509) then are certain fixedly Lovibond red value, and the curve of measuring and drawing during change Lovibond blue valve.
As shown in Figure 6, in the measuring process, record each color component ratio P point (605) of sample, find four the grid A points (601), B point (602), C point (603) and the D point (604) that surround P point (605).
These four net points are respectively the measurement results of four Lovibond standard color chips combined values in the calibration process, and must belong to respectively red lines such as certain two, etc. yellow line; Or etc. red line, etc. blue line; Or etc. yellow line, etc. the intersection point of blue line.
Claims (2)
1. electronics Lovibond detection system is used color sensor, and the LED stabilized light source carries out color measuring, it is characterized in that:
Formed by led light source, color sensor, cuvette, microprocessor, light source constant-current controller, Switching Power Supply, display, button, mini-printer;
Cuvette is between led light source and color sensor, testing sample is placed in the cuvette, the light that led light source sends sees through testing sample and arrives color sensor, led light source, cuvette and color sensor have constituted the measurement light path, for fear of the influence of surround lighting, measuring light path is the darkroom when detecting;
Color sensor is gathered the red, green, blue component value of testing sample, is sent to microprocessor and handles, and display shows the Lovibond value of measurement result, by the operation of key control detection system, mini-printer printout measurement result;
Switching Power Supply provides the galvanic current source for detection system, guarantee the electric current and voltage output that the light source constant-current controller is stable, and the light source constant-current controller provides stable constant-current supply output for led light source; Adopt the enhancing of light source constant-current controller to the control of the luminous degree of stability of led light source, to strengthen luminous degree of stability, improve the colour examining accuracy;
Used color sensor is the red green blue tricolor color sensor, from redly, the light of green, blue color filtered sheet gating different colours, record the RGB color component value; Color sensor before using, module restarts, changes under the situation such as light source and carry out white balance, the adjustment color-ratio, concrete grammar is as follows:
The test tube of sky is placed on the color sensor top, a white light source is placed in empty test tube top, making incident light can pass test tube shines on the color sensor, gating redness, green and blue electric-wave filter successively, record three kinds of color component value, calculate each color component correction factor according to following formula:
R, G, B are respectively red, green, blue color component measured value, Ratio in the formula
R, Ratio
G, Ratio
BBe respectively red, green, the blue-correction factor, color measuring updating formula as a result is:
R in the formula
Measured value, G
Measured value, B
Measured valueMeasured value for each color component behind each color measuring; R
After the correction, G
After the correction, B
After the correctionBe each color component value after proofreading and correct, the RGB color converts to adopt to the Lovibond color and proofreaies and correct back numerical value.
2. electronics Lovibond colorimetry method is characterized in that:
Carry out the RGB color based on the color component ratio and convert to the Lovibond color, color component ratio computing formula is as follows:
R in the formula
After the correction, G
After the correction, B
After the correctionNumerical value for each color component after the white balance correction; R%, g%, b% are each color component ratio, are used for calibration process and the measuring process of method for measuring color, adopt the color component ratio to replace the advantage of color component itself to be that measured value is not subjected to the influence of environmental light intensity and optical path length;
Comprise two processes:
(1) calibration process: purpose is to set up Lovibond standard color chips at the corresponding relation of color component ratio coordinate system;
Step 1.1: select coordinate system, select r%-g% color component ratio coordinate system, perhaps r%-b% color component ratio coordinate system, perhaps b%-g% color component ratio coordinate system is wherein a kind of, be designated as the x%-y% coordinate system, satisfy x%, y% ∈ { r%, g%, b%}, and x%, the y% difference;
Step 1.2: measure all Lovibond reddish yellow color chips combinations, elder generation is the red color chips (value LR ∈ [0,79]) of Lovibond fixedly, the yellow color chips (value LY ∈ [0,79]) of Lovibond is gone in stack successively then, records that all Lovibonds are red, erotic film combination (LR, LY) (x%, y%) coordinate figure;
Step 1.3: measure the combination of all Lovibond reddish blue sheets, earlier the fixing red color chips of Lovibond (value LR ∈ " 0,79]); the blue color chips (value LB ∈ [0,49]) of Lovibond is gone in stack successively then, record red, the blue sheet of all Lovibonds make up (LR; LB) (x%, y%) coordinate figure;
Step 1.4: measure all Lovibond champac color chips combinations, elder generation is the yellow color chips (value LY ∈ [0,79]) of Lovibond fixedly, the blue color chips (value LB ∈ [0,49]) of Lovibond is gone in stack successively then, records all Lovibond Huangs, blue sheet combination (LY, LB) (x%, y%) coordinate figure;
Step 1.5: preserve coordinate figure, the combination of Lovibond standard color chips (c%, y%) coordinate figure deposits microprocessor or its tape storage in;
Calibration process is regularly carried out according to detecting instrument standard verification and relevant industries standard;
(2) measuring process: purpose is to measure each color component of sample, and is scaled the Lovibond value;
Step 2.1: measure each color component of sample;
Step 2.2: white balance correction;
Step 2.3: calculate the color component ratio: P (r%
Sample, g%
Sample, b%
Sample) point;
Step 2.4: select coordinate system, select the x%-y% color component ratio coordinate system identical with calibration process;
Step 2.5: find out adjacent four net points, in the x%-y% coordinate system, find out and surround four net point A (x% that P is ordered
A, y%
A), B (x%
B, y%
B), C (x%
C, y%
C) and D (x%
D, y%
D), respectively corresponding four Lovibond standard color chips combined value LA (the L α of these four net points
A, L β
A), LB (L α
B, L β
B), LC (L α
C, L β
C) and LD (L α
D, L β
D), label L α wherein, L β ∈ { LR, LY, LB}, and L α, L β difference;
Step 2.6: interpolation is estimated the Lovibond value, adopts interpolation algorithm to calculate the corresponding Lovibond combined value of P point
Wherein
With
Be the Lovibond estimated value;
Step 2.7: determine the 3rd Lovibond value.
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