CN103595998A - Device and method for testing colors of colored CCD chip - Google Patents

Abstract

The invention discloses a device for testing colors of a colored CCD chip. The device mainly solves the problem that an existing testing device can not accurately judge color quality of the colored CCD chip. The device comprises a xenon lamp light source, a monochrometer, an attenuator, an integrating sphere, a dark room, a Dewar bottle temperature control chamber, a drive control circuit and an upper computer. A colored CCD chip to be tested is placed in the Dewar bottle temperature control chamber and is connected with the drive control circuit. The monochrometer generates monochrome light and three-primary color light through irradiation of the xenon lamp light source and parameter adjustment, after the monochrome light and three-primary color light are converted to uniform face array light through the integrating sphere and the dark room, the light irradiates the colored CCD chip to be tested, and rgb brightness values of an image are obtained through the drive control circuit and the upper computer. The image is transferred to an L*a*b* space from an rgb space, and color quality of the colored CCD chip to be tested is judged according to the magnitude of the Euclidean distance between a point to be tested and a standard point in the L*a*b* space. The device has the advantages of being high in adaptability and stability, accurate in measurement of color brightness values, and capable of being used for quality selection of colored CCD chips.

Description

Color testing apparatus and the method for colored CCD chip

Technical field

The invention belongs to optical measurement field, be specifically related to color testing apparatus and the method for colored CCD chip, for the evaluation of colored CCD quality.

Background technology

Charge coupled device ccd is the semiconductor device growing up early 1970s, and its receiver surface optical radiation energy that reflect or that self launches records the surperficial visual information of object.CCD is as a kind of important optical detection device, and its various performance parameters has determined the performance of detection system to a great extent, therefore, when development detection system, need to select the CCD chip of suitable performance parameter.

CCD mainly several aspects application below at home at present.One, metering detects, and mainly comprises linear measure longimetry, thickness measure, level gauging.Two, optical Information Processing, comprises spectral energy analysis, image recognition, sign identification.Three, Automation of Manufacturing Process, comprises the vision for Automation of Welding weld joint tracking, industrial robot.In addition, domestic also have some experts to distribute and also obtained certain achievement in the temperature field that utilizes colored CCD to measure high temp objects, at present also at the experimental stage, but it has very large advantage to the two dimension of moving object or three-dimensional temperature field measurement, as the distribution of measurement temperature field in furnace etc.

In measuring system, colored CCD major function is the collection of settling signal, and ccd image sensor is originated as the signal of whole system, and its quality has directly determined performance and the precision of system.Colored CCD can resolve into wavelength incident light and be respectively 700nm, 546.1nm, the red, green, blue of 435.8nm, i.e. rgb image three-colo(u)r, by image pick-up card, be converted into digital picture, utilize image processing techniques to obtain the light intensity value of arbitrfary point under different wave length in digital picture.And the performance parameter index that colored CCD manufacturer provides is some basic operation parameters, as responsiveness, signal to noise ratio, dark current etc., and not mentioned color information, thereby cannot evaluate the quality of chromaticity in CCD imaging, inconvenience is used.

Summary of the invention

The object of the invention is to the vacancy for existing colored CCD chip testing technology, propose a kind of color testing apparatus and method of colored CCD chip, to realize, the RGB rgb brightness value of statement CCD color information quality is measured with rgb space to L ^*a ^*b ^*the conversion in space, is convenient to the selection to the up-to-standard colored CCD chip of color in use.

Technical scheme of the present invention is achieved in that

For achieving the above object, test macro of the present invention comprises: xenon source (1), monochromator (2), integrating sphere (4), darkroom (5) and Dewar bottle temperature controlled compartment (6), the input of the output of this integrating sphere (4) and darkroom (5) fixes, and the output of darkroom (5) and Dewar bottle temperature controlled compartment (6) front end fix; This xenon source (1) is positioned at the front end of monochromator (2), it is characterized in that:

Between the input of monochromator (2) and integrating sphere (4), be connected with attenuator (3), for generation of the primaries meeting in CIE standard with the corresponding intensity of known wavelength monochromatic light;

The rear end of Dewar bottle temperature controlled compartment (6) is connected with Drive and Control Circuit (7) and host computer (8) in turn, for generating the RGB rgb brightness value of colored CCD image that chip becomes;

Described Drive and Control Circuit (7) comprising:

CCD drive circuit, is used to colored CCD chip to be measured (9) that required driving sequential group and driving voltage is provided, and reads the analog signal of colored CCD chip to be measured (9);

Data acquisition circuit, for amplifying and gathering the analog signal that colored CCD chip (9) is read, is digital signal by its buffer memory, and sends to usb communication unit;

Usb communication unit, for connecting CCD drive circuit and host computer (8), realizes the two-way communication that host computer (8) transmits control command and receives colored CCD chip to be measured (9) outputting analog signal to CCD drive circuit.

For achieving the above object, method of testing of the present invention comprises:

(1) generate testing image rgb brightness value step:

(1a) with xenon source (1), irradiate monochromator (2), by host computer (8), monochromator (2) is carried out to setting parameter, making its output wavelength is the monochromatic light that λ, spectral resolution are 1nm, and λ is within the scope of 200nm～2500nm;

(1b) this monochromatic light is successively after attenuator (3) and integrating sphere (4), the monochromatic uniform surface battle array light of output radiation uniformity >98%;

(1c) by two ends, darkroom (5) respectively with the outlet and airtight connection of Dewar bottle temperature controlled compartment (6) of integrating sphere (4), make the monochromatic uniform surface battle array light of integrating sphere (4) output be transferred to Dewar bottle temperature controlled compartment (6);

(1d) colored CCD chip to be measured is placed in Dewar bottle temperature controlled compartment (6), Dewar bottle temperature controlled compartment (6) is set within the scope of working temperature-10～75 ℃ of colored CCD, and is evacuated after it is airtight;

(1e) colored CCD chip to be measured is connected with Drive and Control Circuit (7), after monochromatic uniform surface battle array light and colored CCD chip temperature to be measured are stable, by host computer (8), control colored CCD chip generating digital image to be measured, using it as testing image, and calculate the rgb brightness value of this testing image

rgb represents red, green, blue;

(2) generate standard picture rgb brightness value step:

(2a) with xenon source (1), irradiate monochromator (2), by host computer (8), monochromator (2) parameter is reset, output wavelength is that λ, spectral resolution are 1nm, and meet the rgb primaries of respective strengths in CIE standard, this rgb primaries passes through attenuator (3) and integrating sphere (4) successively, the rgb three primary colors uniform surface battle array light of output radiation uniformity >98%;

(2b) described rgb three primary colors uniform surface battle array light is transferred to Dewar bottle temperature controlled compartment (6) through darkroom (5), by host computer (8), control colored CCD chip matching generating digital image to be measured, using it as standard picture, calculate the rgb brightness value of this standard picture

(3) colored CCD chip chromaticity determining step to be measured:

(3a) by rgb spatial transformation, be L ^*a ^*b ^*space, makes the rgb brightness value of testing image be converted to L ^*a ^*b ^*tested point (L in space ₁ ^*, a ₁ ^*, b ₁ ^*), the rgb brightness value of standard picture

be converted to L ^*a ^*b ^*standard point (L in space ₂ ^*, a ₂ ^*, b ₂ ^*), wherein, L ^*the lightness that represents color, L ^*=0 indication black, L ^*=100 indication whites; a ^*represent the position of color between green and redness, a ^*for negative value indication green, a ^*for red on the occasion of indication; b ^*represent the position of color between blueness and yellow, b ^*for negative value indication blueness, b ^*for yellow on the occasion of indication;

(3b) at L ^*a ^*b ^*in space, calculate tested point (L ₁ ^*, a ₁ ^*, b ₁ ^*) and standard point (L ₂ ^*, a ₂ ^*, b ₂ ^*) Euclidean distance of point-to-point transmission: Δ E ^* _ab=[(L ₂ ^*-L ₁ ^*) ²+ (a ₂ ^*-a ₁ ^*) ²+ (b ₂ ^*-b ₁ ^*) ²] ^1/2;

(3c) with Euclidean distance Δ E ^* _absize represent testing image color and standard picture match colors degree, as Δ E ^* _abwhile approaching zero, testing image color mates substantially with standard picture color, and colored CCD chip quality to be measured is qualified; As Δ E ^* _abwhile being far longer than zero, testing image color and standard picture color error ratio are excessive, and colored CCD chip quality to be measured is defective.

Tool of the present invention has the following advantages:

1) the present invention utilizes Drive and Control Circuit to realize and drive control, data acquisition and usb communication colored CCD chip color measurements system, make this system can be applicable to different colored CCD chips, can measure different colored CCD chips, meet the demand of practical application;

2) the present invention utilizes host computer to carry out setting parameter to monochromator in the color measurements system of colored CCD chip, making it export different monochromatic light and primaries meets and measures requirement, and control colored CCD chip generating digital image, calculate the rgb brightness value of digital picture, be convenient to rgb spatial transformation to L ^*a ^*b ^*space;

3) the present invention utilizes L ^*a ^*b ^*in space, the size of the Euclidean distance of 2 of tested point and standard points represents testing image color and standard picture match colors degree, judge that accordingly whether colored CCD chip quality to be measured is qualified, be convenient in use the up-to-standard colored CCD chip of color be selected.

Accompanying drawing explanation

Fig. 1 is the color measurements system architecture diagram of colored CCD chip of the present invention;

Fig. 2 is the color measurements method flow diagram of colored CCD chip of the present invention.

Embodiment

Below with reference to accompanying drawing, the present invention is described in further detail.

With reference to Fig. 1, measuring system of the present invention comprises: xenon source 1, monochromator 2, attenuator 3, integrating sphere 4, darkroom 5, Dewar bottle temperature controlled compartment 6, Drive and Control Circuit 7 and host computer 8.Wherein: the spectral region of xenon source 1 is that 200nm～2500nm, power are 500 watts; The output spectrum resolution of monochromator 2 is 1nm and adjustable continuously; The resolution of attenuator 3 is not less than 1nm, and attenuation is at 1～20dB, and gamut is adjustable continuously; The diameter of integrating sphere 4 is 20 inches of diffuse reflection spheroids, and inlet diameter is 2 inches, and outlet diameter is 4 inches, and coating on inner surface is Spectralon, radiation uniformity >98%; Darkroom 5 is the wooden cavity of rectangle, and inside cavity scribbles lighttight black coating, and top is provided with lid that can be movable; The temperature controllability of Dewar bottle temperature controlled compartment 6 is good, and seal is good.Drive and Control Circuit 7, comprise CCD drive circuit 71, data acquisition circuit 72 and usb communication unit 73, CCD drive circuit provides driving voltage for CCD chip, control CCD chip calls over analog signal and amplifies and gather for data acquisition circuit, and buffer memory is to send to usb communication unit after digital signal; Host computer 8, comprises control module, digital imagery module and Digital Image Processing module.

Monochromator 2 is connected with attenuator 3; Integrating sphere 4 two ends are connected with darkroom 5 with attenuator 3 respectively; The output in darkroom 5 and Dewar bottle temperature controlled compartment 6 front ends fix; The rear end of Dewar bottle temperature controlled compartment 6 connects the input of Drive and Control Circuit 7, and the output of Drive and Control Circuit 7 connects host computer 8.The interior placement of Dewar bottle temperature controlled compartment 6 colored CCD chip 9 to be measured.

Described CCD drive circuit 71, for colored CCD chip 9 to be measured provides required driving sequential group and driving voltage, the analog signal of reading colored CCD chip 9 to be measured;

Described data acquisition circuit 72, comprises pre-amplification circuit, modulus conversion chip and FPGA data acquisition and buffer.The analog signal that pre-amplification circuit is read CCD drive circuit 71 is amplified, modulus conversion chip carries out analog-to-digital conversion to the analog signal collecting, the digital signal obtaining is exported to FPGA and carry out data acquisition and buffer memory, and digital signal is sent to usb communication unit 73;

Described usb communication unit 73, it is connected with host computer 8, realize the order of 8 pairs of CCD drive circuits 71 of host computer and data acquisition circuit 72 and control, and data acquisition circuit 72 is to host computer 8 transmission of digital signals.

Described control module 81, controls monochromatic light and the primaries of the different wave length that monochromator 2 output resolution ratios are 1nm, and controls the analog signal that host computer 8 receives colored CCD chip 9 outputs to be measured;

Described digital imagery module 82, is converted into the digital signal of data acquisition circuit 72 outputs according to communication protocol the brightness value of each image pixel, thereby shows generating digital image;

Described Digital Image Processing module 83, realizes rgb space to L ^*a ^*b ^*the conversion in space, the rgb brightness value corresponding conversion that is about to image is L ^*a ^*b ^*value, calculates L ^*a ^*b ^*the Euclidean distance of 2 of tested point and standard points in space, the size of this distance represents testing image color and standard picture match colors degree.

With reference to Fig. 2, the method that the present invention utilizes above-mentioned measurement mechanism to measure colored CCD chip, implementation step is as follows:

Step 1, generates testing image rgb brightness value.

(1a) with xenon source 1, irradiate monochromator 2, by 8 pairs of monochromators of host computer 2, carry out setting parameter, making its output wavelength is the monochromatic light that λ, spectral resolution are 1nm, and λ is adjustable within the scope of 200nm～2500nm, and this example is established λ=400nm;

(1b) monochromatic light of monochromator 2 outputs, through attenuator 3, after its luminous power is decayed, then carries out multiple reflections through integrating sphere 4, and output light radiation uniformity >98%, obtains monochromatic uniform surface battle array light;

(1c) for making monochromatic uniform surface battle array light not be subject to external environmental interference, the two ends in darkroom 5 are connected with Dewar bottle temperature controlled compartment 6 is airtight with the outlet of integrating sphere 4 respectively, make the monochromatic uniform surface battle array light of integrating sphere 4 outputs be transferred to Dewar bottle temperature controlled compartment 6 by darkroom 5;

(1d) colored CCD chip 9 to be measured is placed in Dewar bottle temperature controlled compartment 6, the temperature of Dewar bottle temperature controlled compartment 6 is set within the scope of-10～75 ℃, as the working temperature of colored CCD chip 9 to be measured, this example is set to 25 ℃ of room temperatures by Dewar bottle temperature controlled compartment 6, and is evacuated after it is airtight;

(1e) colored CCD chip 9 to be measured is connected with Drive and Control Circuit 7, the output of Drive and Control Circuit 7 connects host computer 8, after monochromatic uniform surface battle array light and colored CCD chip 9 temperature stabilizations to be measured, Drive and Control Circuit 7 provides required driving sequential group and driving voltage for colored CCD chip 9 to be measured, make colored CCD chip 9 outputting analog signals to be measured, host computer 8 is controlled the analog signal that Drive and Control Circuit 7 receives colored CCD chip 9 outputs to be measured, this analog passband signal is overdrived after control circuit 7 is converted to digital signal and is exported to host computer 8, host computer 8 is converted into this digital signal the brightness value of each image pixel, show generating digital image, using it as testing image, and calculate the RGB rgb brightness value of this testing image

Step 2, the rgb brightness value of generation standard picture.

(2a) with xenon source 1, irradiate monochromator 2, make the monochromatic light of its output wavelength λ=400nm, this monochromatic light is converted to the Red Green Blue light of respective strengths in CIE standard; Parameter by 8 pairs of monochromators 2 of host computer re-starts setting, and making its output wavelength is the red light of 700nm, the green light that wavelength is 546.1nm, and the blue light that wavelength is 435.8nm, this trichromatic spectral resolution is 1nm;

(2b) by Red Green Blue light process attenuator 3, after its luminous power is decayed, then carry out multiple reflections through integrating sphere 4, output light radiation uniformity >98%, obtains Red Green Blue uniform surface battle array light;

(2c) by described red, green, primary colors uniform surface battle array light is transferred to Dewar bottle temperature controlled compartment 6 through darkroom 5, Drive and Control Circuit 7 provides required driving sequential group and driving voltage for colored CCD chip 9 to be measured, make colored CCD chip 9 outputting analog signals to be measured, host computer 8 is controlled the analog signal that Drive and Control Circuit 7 receives colored CCD chip 9 outputs to be measured, this analog passband signal is overdrived after control circuit 7 is converted to digital signal and is exported to host computer 8, host computer 8 is converted into this digital signal the brightness value of each image pixel, show generating digital image, using it as standard picture, and calculate the rgb brightness value of this standard picture

Step 3, judges colored CCD chip chromaticity to be measured.

(3a) by rgb spatial transformation, be L ^*a ^*b ^*space, makes the rgb brightness value of testing image be converted to L ^*a ^*b ^*tested point (L in space ₁ ^*, a ₁ ^*, b ₁ ^*); Make the rgb brightness value of standard picture simultaneously

be converted to L ^*a ^*b ^*standard point (L in space ₂ ^*, a ₂ ^*, b ₂ ^*),

Wherein, L ^*the lightness that represents color, L ^*=0 indication black, L ^*=100 indication whites; a ^*represent the position of color between green and redness, a ^*for negative value indication green, a ^*for red on the occasion of indication; b ^*represent the position of color between blueness and yellow, b ^*for negative value indication blueness, b ^*for yellow on the occasion of indication;

(3b) at L ^*a ^*b ^*in space, calculate tested point (L ₁ ^*, a ₁ ^*, b ₁ ^*) and standard point (L ₂ ^*, a ₂ ^*, b ₂ ^*) Euclidean distance of point-to-point transmission: Δ E ^* _ab=[(L ₂ ^*-L ₁ ^*) ²+ (a ₂ ^*-a ₁ ^*) ²+ (b ₂ ^*-b ₁ ^*) ²] ^1/2, L wherein ₁ ^*the lightness that represents testing image color, L ₂ ^*the lightness that represents standard picture color, a ₁ ^*represent the position of testing image color between green and redness, a ₂ ^*represent the position of standard picture color between green and redness, b ₁ ^*represent the position of testing image color between blueness and yellow, b ₂ ^*represent the position of standard picture color between blueness and yellow.

(3c) with Euclidean distance Δ E ^* _absize judgement testing image color and the matching degree of standard picture color:

As Δ E ^* _abwhile approaching zero, testing image color mates substantially with standard picture color, and colored CCD chip quality to be measured is qualified;

As Δ E ^* _abwhile being far longer than zero, testing image color and standard picture color error ratio are excessive, and colored CCD chip quality to be measured is defective.

Described rgb space and L ^*a ^*b ^*the at present existing ripe prior art of space conversion, < < Sang Sheng light for example, the research of pearly luster degree and colorimetry method, Tianjin: University Of Tianjin, 2009,2 (2): 6～9 > >; < < colorimetry basis, by jeewah, according to CIE15:2004 " TECHNICAL REPORT COLORIMETRY ", write > > etc. and locate all to have correlative study, this example is mainly according to < < colorimetry basis, the space transfer process of writing > > according to CIE15:2004 " TECHNICAL REPORT COLORIMETRY " by jeewah is carried out, and it is summarized as follows:

The first step, in rgb space, represents CIE color matching with following colour equation:

C≡R(R)+G(G)+B(B)

Wherein, ≡ represents coupling, and C represents spectrum colour to be matched, and R, G, B represent tristimulus values, mate the required trichromatic amount of certain color, (R) represents (G) to represent green color by red color, (B) represents blue color;

Second step, establishes in equal-energy spectrum colour matching, and trichromatic intrinsic brilliance is

mating each wavelength is the quantity of the equal-energy spectrum look corresponding Red Green Blue of λ, is called color matching functions, is designated as

that is:

$\stackrel{\&OverBar;}{r}\left(\mathrm{\&lambda;}\right)={\stackrel{\&OverBar;}{r}}_0\left(\mathrm{\&lambda;}\right)/m*\left(R\right)$

$\stackrel{\&OverBar;}{g}\left(\mathrm{\&lambda;}\right)={\stackrel{\&OverBar;}{g}}_0\left(\mathrm{\&lambda;}\right)/m*\left(G\right),$

$\stackrel{\&OverBar;}{b}\left(\mathrm{\&lambda;}\right)={\stackrel{\&OverBar;}{b}}_0\left(\mathrm{\&lambda;}\right)/m*\left(B\right)$

Wherein, m represents the actual high-high brightness of equal-energy spectrum look, and * represents to multiply each other;

The 3rd step, mates equal-energy spectrum, obtains tristimulus values R, G, B is as follows:

$R=\mathrm{\&Sigma;}\stackrel{\&OverBar;}{r}\left(\mathrm{\&lambda;}\right),G=\mathrm{\&Sigma;}\stackrel{\&OverBar;}{g}\left(\mathrm{\&lambda;}\right),B=\mathrm{\&Sigma;}\stackrel{\&OverBar;}{b}\left(\mathrm{\&lambda;}\right);$

The 4th step, according in rgb space

there will be the negative value not meet actual situation, by rgb space

all become on the occasion of, take rgb space and be the CIE-XYZ color space of base configuration hypothesis, with X, Y, Z, represent to mate the tristimulus values of certain color, conversion formula is as follows:

$\stackrel{\&OverBar;}{x}\left(\mathrm{\&lambda;}\right)=2.768892\stackrel{\&OverBar;}{r}\left(\mathrm{\&lambda;}\right)+1.751748\stackrel{\&OverBar;}{g}\left(\mathrm{\&lambda;}\right)+1.130160\stackrel{\&OverBar;}{b}\left(\mathrm{\&lambda;}\right)$

$\stackrel{\&OverBar;}{y}\left(\mathrm{\&lambda;}\right)=1.000000\stackrel{\&OverBar;}{\mathrm{\&lambda;}}\left(\mathrm{\&lambda;}\right)+4.590700\stackrel{\&OverBar;}{g}\left(\mathrm{\&lambda;}\right)+0.060100\stackrel{\&OverBar;}{b}\left(\mathrm{\&lambda;}\right)$

$\stackrel{\&OverBar;}{z}\left(\mathrm{\&lambda;}\right)=0\stackrel{\&OverBar;}{r}\left(\mathrm{\&lambda;}\right)+0.056508\stackrel{\&OverBar;}{g}\left(\mathrm{\&lambda;}\right)+5.594292\stackrel{\&OverBar;}{b}\left(\mathrm{\&lambda;}\right)$

Wherein,

represent respectively red, green, blue color matching functions,

The relation of being released X, Y, Z and R, G, B by above conversion formula is as follows:

X＝2.768892R+1.751748G+1.130160B

Y＝1.000000R+4.590700G+0.060100B

Z＝0R+0.056508G+5.594292B；

The 5th step, is converted to the L in CIE standard by following formula by tristimulus values X, Y, Z ^*, a ^*, b ^*,

L ^*＝116f(Y/Y _n)-16

a ^*＝500[f(X/X _n)-f(Y/Y _n)]

b ^*＝200[f(Y/Y _n)-f(Z/Z _n)]

Wherein, L ^*the lightness that represents color, a ^*represent the position of color between green and redness, b ^*represent the position of color between blueness and yellow; X _n, Y _n, Z _ntristimulus values for standard light;

The 6th step, the tristimulus values X trying to achieve according to above step, Y, Z, by X, Y, Z and X _n, Y _n, Z _nratio try to achieve f (Y/Y _n), f (X/X _n), f (Z/Z _n) as follows:

If (X/X _n) > (24 * 116) ^1/3, f (X/X _n)=(X/X _n) ^1/3;

If (X/X _n)≤(24 * 116) ^1/3, f (X/X _n)=(841/108) (X/X _n)+16/116;

If (Y/Y _n) > (24 * 116) ^1/3, f (Y/Y _n)=(Y/Y _n) ^1/3;

If (Y/Y _n)≤(24 * 116) ^1/3, f (Y/Y _n)=(841/108) (Y/Y _n)+16/116;

If (Z/Z _n) > (24 * 116) ^1/3, f (Z/Z _n)=(Z/Z _n) ^1/3;

If (Z/Z _n)≤(24 * 116) ^1/3, f (Z/Z _n)=(841/108) (Z/Z _n)+16/116;

The 7th step, according to f (X/X _n), f (Y/Y _n), f (Z/Z _n) value, by X, Y, Z and L ^*, a ^*, b ^*change type try to achieve respectively L ^*, a ^*, b ^*value, by L ^*, a ^*, b ^*point (the L that value forms ^*, a ^*, b ^*) be required L ^*a ^*b ^*spatial point, realizes rgb space and L ^*a ^*b ^*the conversion in space.

Claims (6)

1. the colour measuring device of a colored CCD chip, comprise: xenon source (1), monochromator (2), integrating sphere (4), darkroom (5) and Dewar bottle temperature controlled compartment (6), the input of the output of this integrating sphere (4) and darkroom (5) fixes, and the output of darkroom (5) and Dewar bottle temperature controlled compartment (6) front end fix; This xenon source (1) is positioned at the front end of monochromator (2), it is characterized in that:

Between the input of monochromator (2) and integrating sphere (4), be connected with attenuator (3), for generation of the primaries meeting in CIE standard with the corresponding intensity of known wavelength monochromatic light;

The rear end of Dewar bottle temperature controlled compartment (6) is connected with Drive and Control Circuit (7) and host computer (8) in turn, for generating the RGB rgb brightness value of colored CCD image that chip becomes;

Described Drive and Control Circuit (7) comprising:

CCD drive circuit, is used to colored CCD chip to be measured (9) that required driving sequential group and driving voltage is provided, and reads the analog signal of colored CCD chip to be measured (9);

Data acquisition circuit, for amplifying and gathering the analog signal that colored CCD chip to be measured (9) is read, is digital signal by its buffer memory, and sends to usb communication unit;

Usb communication unit, for connecting CCD drive circuit and host computer (8), realizes the two-way communication that host computer (8) transmits control command and receives colored CCD chip to be measured (9) outputting analog signal to CCD drive circuit.

2. the colour measuring device of colored CCD chip according to claim 1, is characterized in that, CCD drive circuit comprises:

Tfi module, for providing colored CCD chip to be measured (9) imaging required driving sequential group;

Voltage module, for providing colored CCD chip to be measured (9) imaging required driving voltage;

Interface module, for connecting the input and output of colored CCD chip to be measured (9).

3. the colour measuring device of colored CCD chip according to claim 1, is characterized in that, data acquisition circuit comprises:

Pre-amplification circuit, for changing the photo-signal of colored CCD chip to be measured (9) output into voltage signal, and is transferred to analog-to-digital conversion module by the voltage signal after changing;

Analog-to-digital conversion module, carries out analog-to-digital conversion for the voltage signal that sampling is obtained, and the digital signal obtaining is also exported to FPGA data acquisition and cache module;

FPGA data acquisition and cache module, for gathering the read output signal of colored CCD chip to be measured (9), and according to sequential requirement, carry out row field synchronization to the signal collecting, and the signal collecting is buffered in module.

4. the colour measuring device of colored CCD chip according to claim 1, is characterized in that, host computer is provided with in (8):

Control module, for controlling monochromator, regulates its output wavelength and resolution, and controls the output signal that host computer (8) receives colored CCD chip to be measured (9);

Digital imagery module, for reading the output signal of colored CCD chip to be measured (9), and generating digital image;

Digital Image Processing module, for calculating the rgb brightness value of digital picture, and realizes rgb space to L ^*a ^*b ^*testing image and standard picture L after the conversion of space ^*a ^*b ^*the coupling of value, L ^*the lightness that represents color, a ^*represent the position of color between green and redness, b ^*represent the position of color between blueness and yellow.

5. the colour measuring device of colored CCD chip according to claim 4, is characterized in that, Digital Image Processing module comprises:

Brightness value generates submodule, for calculating the rgb brightness value of digital picture

Space conversion submodule, for being L by rgb spatial transformation ^*a ^*b ^*space is L by the rgb brightness value corresponding conversion of image ^*a ^*b ^*value;

Space matched sub-block, for the L of testing image after computer memory conversion ^*a ^*b ^*the L of value and standard picture ^*a ^*b ^*the difference of value, the matching result of judgement testing image.

6. a method of utilizing measurement device colored CCD chip color described in claim 1, comprising:

(1) generate testing image rgb brightness value step:

(1a) with xenon source (1), irradiate monochromator (2), by host computer (8), monochromator (2) is carried out to setting parameter, making its output wavelength is the monochromatic light that λ, spectral resolution are 1nm, and λ is within the scope of 200nm～2500nm;

(1b) this monochromatic light is successively after attenuator (3) and integrating sphere (4), the monochromatic uniform surface battle array light of output radiation uniformity >98%;

(1c) by two ends, darkroom (5) respectively with the outlet and airtight connection of Dewar bottle temperature controlled compartment (6) of integrating sphere (4), make the monochromatic uniform surface battle array light of integrating sphere (4) output be transferred to Dewar bottle temperature controlled compartment (6);

(1d) colored CCD chip to be measured (9) is placed in Dewar bottle temperature controlled compartment (6), Dewar bottle temperature controlled compartment (6) is set within the scope of working temperature-10～75 ℃ of colored CCD, and is evacuated after it is airtight;

(1e) colored CCD chip to be measured is connected with Drive and Control Circuit (7), after monochromatic uniform surface battle array light and colored CCD chip temperature to be measured are stable, by host computer (8), control colored CCD chip to be measured (9) generating digital image, using it as testing image, and calculate the rgb brightness value of this testing image

rgb represents red, green, blue;

(2) generate standard picture rgb brightness value step:

(2a) with xenon source (1), irradiate monochromator (2), by host computer (8), monochromator (2) parameter is reset, output wavelength is that λ, spectral resolution are 1nm, and meet the rgb primaries of respective strengths in CIE standard, this rgb primaries passes through attenuator (3) and integrating sphere (4) successively, the rgb three primary colors uniform surface battle array light of output radiation uniformity >98%;

(2b) described rgb three primary colors uniform surface battle array light is transferred to Dewar bottle temperature controlled compartment (6) through darkroom (5), by host computer (8), control colored CCD chip to be measured (9) matching generating digital image, using it as standard picture, calculate the rgb brightness value of this standard picture

(3) colored CCD chip chromaticity determining step to be measured:

(3a) by rgb spatial transformation, be L ^*a ^*b ^*space, makes the rgb brightness value of testing image be converted to L ^*a ^*b ^*tested point (L in space ₁ ^*, a ₁ ^*, b ₁ ^*), the rgb brightness value of standard picture

be converted to L ^*a ^*b ^*standard point (L in space ₂ ^*, a ₂ ^*, b ₂ ^*), wherein, L ^*the lightness that represents color, L ^*=0 indication black, L ^*=100 indication whites; a ^*represent the position of color between green and redness, a ^*for negative value indication green, a ^*for red on the occasion of indication; b ^*represent the position of color between blueness and yellow, b ^*for negative value indication blueness, b ^*for yellow on the occasion of indication;

(3b) at L ^*a ^*b ^*in space, calculate tested point (L ₁ ^*, a ₁ ^*, b ₁ ^*) and standard point (L ₂ ^*, a ₂ ^*, b ₂ ^*) Euclidean distance of point-to-point transmission: Δ E ^* _ab=[(L ₂ ^*-L ₁ ^*) ²+ (a ₂ ^*-a ₁ ^*) ²+ (b ₂ ^*-b ₁ ^*) ²] ^1/2;

(3c) with Euclidean distance Δ E ^* _absize represent testing image color and standard picture match colors degree, as Δ E ^* _abwhile approaching zero, testing image color mates substantially with standard picture color, and colored CCD chip quality to be measured is qualified; As Δ E ^* _abwhile being far longer than zero, testing image color and standard picture color error ratio are excessive, and colored CCD chip quality to be measured is defective.

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