CN102479005A - Method for correcting flat field of two-dimensional optical detection - Google Patents
Method for correcting flat field of two-dimensional optical detection Download PDFInfo
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- CN102479005A CN102479005A CN2010105724694A CN201010572469A CN102479005A CN 102479005 A CN102479005 A CN 102479005A CN 2010105724694 A CN2010105724694 A CN 2010105724694A CN 201010572469 A CN201010572469 A CN 201010572469A CN 102479005 A CN102479005 A CN 102479005A
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Abstract
The invention relates to a method for correcting a flat field of two-dimensional optical detection. A first optical filter is arranged between a CCD (Charge Coupled Device) and at least one reference illuminator. The reference illuminator is moved relative to the CCD, so as to utilize the CCD to capture a plurality of individual images and integrate a flat field message. Accordingly, a first light intensity correcting field profile is calculated, thereby obtaining a first light intensity correcting rate corresponding to each image coordinate in an image coordinate system of CCD. After a deviated projecting detection image of at least one to-be-detected illuminator is captured by the CCD, a corrected light intensity value corresponding to each image coordinate in the deviated projecting detection image is calculated according to the first light intensity correcting rate, so as to obtain a light intensity correcting detection image.
Description
Technical field
The present invention relates to a kind of bearing calibration of optical detection, relate in particular to the flat field correction method that a kind of two-dimension optical detects.
Background technology
In the two-dimension optical detection system, when same object to be measured position diverse location on plane to be measured, should detect identical testing result, just can keep the consistance of detection, and then accurately detect the flaw that object to be measured itself is had.Yet during actual detected, the consistance of detection but can receive factor affecting such as camera lens vignetting effect (Vignetting Effect), the sensitivity difference of charge-coupled device (CCD) different pixels, the unevenness of filter own and dust contamination, causes the error in the detection.
See also Fig. 1, it is the synoptic diagram that the two-dimension optical detection system detects.As shown in the figure, when carrying out optical detection, charge-coupled device (CCD) (Charge Coupled Device; C D) the LED a plurality of to be measured unit on 100 pairs one detection platform 200 300 captures a detected image with 300a.Wherein, LED to be measured unit 300 is the camera lenses that are right against CCD 100, and LED to be measured unit 300a then and have a field angle W between the camera lens of CCD1.
The cosine-fourth law that art is known under according to the present invention, the brightness value of the imaging of LED to be measured unit 300a can be along with the increases of field angle W, and reduce with the quadruplicate ratio of the cosine that is similar to field angle W.Change to say it, LED to be measured unit 300a camera lens from CCD 100 on detection platform 200 is far away more, and the brightness value of its imaging is more little.Therefore, in fact brightness value is identical even LED to be measured unit 300 is with LED to be measured unit 300a, and both imagings in detected image but can present otherness because of aforesaid law in brightness, and this is so-called gradual halation phenomena (Vignetting).
In addition, the sensitivity difference of CCD 100 inducing pixels, the unevenness of filter itself and the dirty unevenness that dark coil imaging caused that causes of dust all can influence detection accuracy and must be with it correction.
See also Fig. 2, it is in the prior art, the illustrative view of the flat field correction method that two-dimension optical detects.As shown in the figure; Influence all factors of optical detection accuracy in order to get rid of above-mentioned camera lens vignetting effect, sensitivity difference and unevenness etc.; The present practice is before CCD 100 captures this detected image to luminophor 300 to be measured with 300a with a predetermined capture condition, with this predetermined capture condition one uniform plane light source PA200 is captured a flat field correction image (Flat-Field Frame) earlier.So, after obtaining this detected image, can to revise various unevenness, obtain one and proofread and correct the back detected image with this detected image divided by this flat field correction image.Wherein, this predetermined capture condition comprises aperture, filter, focusing from the setting that reaches conditions such as aperture time.
When capturing this flat field correction image,,, can use the simulation of large-scale integration ball light source that this uniform plane light source PA200 is provided if during to the having relatively high expectations of uniformity coefficient because large-area uniform plane light source PA200 is difficult for obtaining.Yet large-scale integration ball price is rather stiff is high.More importantly; Detect often the LED cell matrix to be measured formed with a plurality of LED to be measured unit 300 and 300a in the practical application as detecting target; And the luminous field pattern of described LED cell matrix to be measured; With uniform plane light source PA200 or integrating sphere light source, all has suitable otherness and can't be fully corresponding.What is more, the LED to be measured unit 300 and the 300a of different encapsulation kenels, its luminous field pattern also is not quite similar, and the LED to be measured unit 300 that present flat field correction image also can't be directed against various encapsulation kenels one by one provides accurate flat field correction data with 300a.
In addition, optical detection bearing calibration of the prior art still has another disappearance.Under general encapsulation situation; With the white light LEDs is example; The light beam of LED to be measured unit 300 and the oblique ejaculation of 300a institute can be than the path length of passing through of the light beam of forward ejaculation in the path of passing through that LED to be measured unit 300a is inner, relatively the fluorescent powder total amount of process also more; Cause the LED to be measured unit in the detected image 300 and the chromatic value of 300a imaging to increase and increase, form detected image inhomogeneous on colourity along with rising angle.And optical detection bearing calibration of the prior art, and can't be with inhomogeneous correction the on the colourity.
The present invention promptly is directed against above-mentioned detected image because LED to be measured unit 300a departs from and just throws caused light intensity and the uneven problem of photochromism; Propose the flat field correction method that a kind of two-dimension optical detects, proofread and correct improvement to light intensity and the uneven problem of photochromism.
Summary of the invention
First purpose of the present invention is to solve in the prior art; To flat field correction image (Flat-Field Frame) that planar light source captured can't corresponding fully LED to be measured unit luminous field pattern, can't thoroughly proofread and correct departing from of LED to be measured unit and just throw the uneven problem of light intensity in the detected image and cause.
Second purpose of the present invention is to solve in the prior art; To the flat field correction image that planar light source captured; Can't reflect the uneven phenomenon of LED cell matrix colourity to be measured fully, just throw the uneven problem of colourity in the detected image and can't proofread and correct to depart from.
The means of technical solution problem of the present invention are to provide a kind of flat field correction method of two-dimension optical detection; Utilize CCD to capture the individual image of at least one reference illuminant, and should a plurality of individual image be integrated into a flat field information in a plurality of image coordinate of the image coordinate system of CCD.Wherein, reference illuminant can be one with reference to the LED unit or be provided with one the shielding a reference planes luminophor.
Then, calculate a light intensity through this flat field information and proofread and correct field pattern (Profile), use obtaining the pairing light intensity corrected rate of each image coordinate.Utilizing CCD to capture after departing from of at least one luminophor to be measured just throw detected image; Can be according to the pairing light intensity corrected rate of each image coordinate; Calculate this and depart from and just throw in the detected image each image coordinate pairing and proofread and correct the back light intensity value, use obtaining a light intensity correct detection image.Wherein, this luminophor to be measured is a LED to be measured unit or a flat luminous body to be measured.
In first application examples of the first embodiment of the present invention; Reference illuminant is one with reference to the LED unit; The flat field correction method that two-dimension optical of the present invention detects is for detecting in the flat field information with reference to the LED unit a plurality of bright spot peak value coordinates that should image coordinate system; And calculate with reference to the LED unit total luminance value that should a plurality of bright spot peak value coordinates, according to this with this flat field message interpolation and normalization (Normalization), calculate this light intensity and proofread and correct field pattern.
In second application examples of the first embodiment of the present invention; Reference illuminant is one with reference to the LED unit; The flat field correction method that two-dimension optical of the present invention detects is to make a plurality ofly one to be fastened relative to CCD in detection coordinates with reference to the LED cell matrix and to move with reference to what the LED unit formed; Utilizing CCD acquisition with reference to the matrix individual image of LED cell matrix in many image coordinate of CCD, and through these a plurality of matrix individual image calculate with reference in the LED cell matrix each with reference to the pairing flat field information in LED unit.Should a plurality of flat field information respectively computing be that a light intensity is proofreaied and correct field pattern, and should a plurality of light intensities proofread and correct field pattern average out to one main (Master) light intensities correction field patterns, use calculating pairing this light intensity corrected rate of each image coordinate.
In the second embodiment of the present invention, be that at least one first optical filter, at least one second optical filter and at least one the 3rd optical filter are set at CCD and between with reference to the LED unit in regular turn.Wherein, this first optical filter, this second optical filter and the 3rd optical filter, the tristimulus values of corresponding CIE color matching function (Color-Matching Functions) institute standard respectively.The each switching when one of being provided with in this a plurality of optical filters is to repeat aforementioned flow process to obtain one first flat field information, the second flat field information and the 3rd flat field information respectively, uses to obtain one second light intensity and proofread and correct field pattern and one the 3rd light intensity correction field pattern.Proofread and correct field pattern and the 3rd light intensity correction field pattern through second light intensity, can obtain the pairing one first light intensity corrected rate of each image coordinate, one second light intensity corrected rate and one the 3rd light intensity corrected rate.
According to the pairing first light intensity corrected rate of each image coordinate, the second light intensity corrected rate and the 3rd light intensity corrected rate; Can calculate respectively under each filter, this departs from and just throws the pairing one first light intensity corrected value of each image coordinate, one second light intensity corrected value and one the 3rd light intensity corrected value in the detected image.According to this first light intensity corrected value, this second light intensity corrected value and the 3rd light intensity corrected value, can calculate each image coordinate pairing and proofread and correct back photochromism value.Proofread and correct back light intensity value and should proofread and correct back photochromism value through this, can obtain one light intensity/photochromism correct detection image, will depart from the lump and just throw the light intensity and the photochromism inequality that are caused and proofread and correct simultaneously.
In prior art; Flat field correction image with the planar light source acquisition also can't be proofreaied and correct the uneven phenomenon of light intensity fully; And can't proofread and correct the problem of the uneven phenomenon of photochromism fully; The flat field correction method that two-dimension optical of the present invention detects is owing to capture a flat field information with reference illuminant, and light intensity value after the correction that this flat field information is calculated can be thoroughly just throwed in the detected image inequality of light intensity and photochromism and proofreaied and correct departing from.
Describe the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
Description of drawings
The synoptic diagram that Fig. 1 two-dimension optical detection system detects;
In Fig. 2 prior art, the illustrative view of the flat field correction method that two-dimension optical detects;
Among first embodiment and second embodiment of Fig. 3 preferred embodiment of the present invention, the illustrative view of the flat field correction method that two-dimension optical detects;
The synoptic diagram of the individual image of first application examples of first embodiment of Fig. 4 and Fig. 4 A preferred embodiment of the present invention;
The synoptic diagram of Fig. 5 flat field frame;
The one dimension synoptic diagram of Fig. 6 flat field information;
One dimension synoptic diagram after Fig. 6 A flat field message interpolation and the normalization;
In second application examples of Fig. 7 first embodiment of the invention, the illustrative view of the flat field correction method that two-dimension optical detects;
In second application examples of Fig. 8 first embodiment of the invention, the simple and easy process flow diagram of the flat field correction method that two-dimension optical detects; And
Among second embodiment of Fig. 9 and Fig. 9 A preferred embodiment of the present invention, the simple and easy process flow diagram of the flat field correction method that two-dimension optical detects.
Wherein, Reference numeral
Uniform plane light source PA200
CCD?100
With reference to LED cell matrix 10
With reference to LED unit 1
Image coordinate system ICS
Detection coordinates is TCS
First optical filter 2
The second optical filter 2a
The 3rd optical filter 2b
Field angle W
Peak value coordinate of bright spot X1, X2, X3, X4, X5
Light intensity value I1, I2, I3
Fixed point P1, P2, Pn
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and principle of work are done concrete description:
Please be earlier with reference to the narration of the flat field correction method that detects about present two-dimension optical in the prior art; And consult Fig. 1 and Fig. 2; It is respectively the synoptic diagram that the two-dimension optical detection system detects, and the illustrative view of the flat field correction method that two-dimension optical detects in the prior art.Described in prior art, the flat field correction method that present two-dimension optical detects, and thoroughly just throw caused light intensity and the uneven problem of photochromism because depart from the correct detection image.
The flat field correction method that the present invention provides a kind of two-dimension optical with novelty to detect can be at a charge-coupled device (CCD) (Charge Coupled Device; C D) 100 inductions are at least one is arranged at the luminophor to be measured of a detection platform 200 and obtains one and depart from and just throw after the detected image, departs to this and just throws in the detected image unevenness of light intensity and photochromism and proofread and correct.Wherein, described luminophor to be measured can be a light emitting diode to be measured (Light Emitting Diode; Hereinafter to be referred as LED) unit, perhaps a flat luminous body to be measured.This flat luminous body to be measured can be a planar light source or a flat-panel screens.Below be example to detect a plurality of LED to be measured unit 300 with 300a.
See also Fig. 3, it is among first embodiment of preferred embodiment of the present invention and second embodiment, the illustrative view of the flat field correction method that two-dimension optical detects.In order to solve the flat field correction image (Flat-Field Frame) that uniform plane light source PA200 is captured; Because the luminous field pattern of complete corresponding LED to be measured unit 300 and 300a matrix; Depart from the problem of just throwing detected image and cause thoroughly to proofread and correct, the present invention is directly at least one reference illuminant acquisition flat field correction image.
Wherein, described reference illuminant be one with reference to the LED unit or be provided with one the shielding a reference planes luminophor, the reference planes luminophor can be a flat-panel screens.To be example below with a situation with reference to the LED unit.
In first application examples of the first embodiment of the present invention; As shown in the figure; Be provided with one with reference to LED unit 1 on detection platform 200, with reference to LED unit 1 be and luminophor to be measured 300 and 300a same size and a best sample of any flaw of tool (Golden Sample) not.Then, move with reference among LED unit 1 and the CCD 100 any one, making with reference to LED unit 1 is to move relative to CCD 100 on the TCS in detection coordinates.In the present embodiment, be to move, and make it on detection platform 200, repeat to move, capture with reference to the individual image of LED unit 1 on a plurality of different ground relative position for CCD 100 with reference to LED unit 1.
Subsidiary one carries ground; When reference illuminant is the reference planes luminophor that is provided with shielding; Be to utilize shielding that the reference planes luminophor is modeled as a plurality of flat light emissions; And move any one among reference shielding (drawing) and the CCD 100, for the image of CCD 100 these a plurality of flat light emissions that do not interfere with each other of acquisition, obtain the individual image of reference planes luminophor on a plurality of differences ground relative position by this.
Then, see also Fig. 4 and Fig. 4 A, it is the synoptic diagram of individual image in first application examples of first embodiment of the invention.Shown in Fig. 4 and Fig. 4 A, in aforesaid these a plurality of individual image, be to lay respectively at different ground image coordinate among the image coordinate system ICS with reference to LED unit 1, these a plurality of image coordinate are respectively fixed point P1, fixed point P2 ... With fixed point Pn.Through integrating these a plurality of individual image, can obtain a flat field information.In other words, flat field information is at fixed point P1, fixed point P2 with reference to LED unit 1 ... The summation of the individual image of fixed point Pn.
Detect with reference to LED unit 1 at the LED of each relative position peak value (Peak) coordinate by this flat field information, and calculate, can calculate a light intensity according to this and proofread and correct field pattern (Profile) with reference to the total brightness of LED unit 1 at this relative position.
Flat field information can be shown in the synoptic diagram of the flat field frame that Fig. 5 showed, with the form demonstration of a flat field frame.Perhaps, shown in the synoptic diagram of the flat field information form that table one showed, with the form demonstration of a flat field information form (Table).Write down in the flat field information form with reference to LED unit 1 at each relative position fixed point P1, fixed point P2 ... Image coordinate and the intensity information of fixed point Pn.
Table one
| P1 | (x1，y1) | I?1 |
| P2 | (x2，y2) | I?2 |
| P3 | (x3，y3) | I?3 |
| . . . | . . . | . . . |
| Pn | (xn，yn) | I?n |
See also Fig. 6 in order to explain what is meant by peak value, it is the one dimension synoptic diagram of flat field information, is the A-A sectional drawing among Fig. 5 simultaneously.As shown in the figure, bright spot peak value coordinate is meant when light intensity value forms peak shape in the one dimension synoptic diagram, the coordinate that the place, summit of this peak shape is corresponding.On the other hand, bright spot peak value coordinate X1, X2 ... X5 promptly represents with reference to LED unit 1 on different ground during relative position, and its forward goes out the pairing image coordinate of luminous point.So; Principle based on gradual halation phenomena (Vignetting); The pairing light intensity value I3 of bright spot peak value coordinate X3 that is positioned at central authorities can be greater than the pairing light intensity value I2 of bright spot peak value coordinate X2, and the pairing light intensity value I2 of bright spot peak value coordinate X2 can be greater than the pairing light intensity value I1 of submarginal bright spot peak value coordinate X1.
Shown in Fig. 6 A,, can calculate a light intensity according to this and proofread and correct field pattern (Profile) this flat field message interpolation and normalization (Normalization).
Proofread and correct field pattern through light intensity, can know when being positioned at different ground relative position the degree with positive delivery system error, and then calculate the pairing light intensity corrected rate of each image coordinate with reference to LED unit 1.In the future, to the light intensity value that each image coordinate measured,, can obtain one and proofread and correct the back light intensity value as long as be multiplied by this light intensity corrected rate.
So; Formally detect; Utilize a plurality of luminophors 300 to be measured of CCD 100 acquisitions just to throw after the detected image with departing from of 300a; According to the pairing light intensity corrected rate of each image coordinate, can calculate this and depart from and just throw in the detected image each image coordinate pairing and proofread and correct the back light intensity value, use obtaining a light intensity correct detection image.
Please later consult Fig. 3.In second embodiment of preferred embodiment of the present invention, CCD 100 and with reference to a rotating disk (indicate) also is set between the LED unit 1 is provided with one first optical filter 2, one second optical filter 2a and one the 3rd optical filter 2b on the rotating disk.First optical filter 2, the second optical filter 2a and the 3rd optical filter 2b are respectively an X optical filter, a Y optical filter and a Z optical filter of the tristimulus values of corresponding CIE color matching function (Color-Matching Functions) institute standard.Wherein, The CIE color matching function is to be formulated 1931 Christian eras by International Commission on Illumination (International Commission of Illumination); Be according to standard observation person's (standard observer) human eye describe and with all colourities with three kinds of values X, Y and Z appear.
At first, make the X optical filter be arranged at CCD 100 and with reference between the LED unit 1.Then; Carry out the equal flow journey with first embodiment; Make with reference to LED unit 1 and move, and utilize CCD 100 acquisition, should a plurality of first other image integration being one first flat field information with reference to first individual image of LED unit 1 in a plurality of image coordinate relative to CCD 100; And utilize the first flat field information calculations to go out one first light intensity and proofread and correct field pattern, obtain the pairing one first light intensity corrected rate of each image coordinate according to this.
Next; Rotate rotating disk so that Y optical filter and Z optical filter are arranged at CCD 100 in regular turn and with reference between the LED unit 1; And repeat above-mentioned capture computing flow process; Use the one second flat field information of acquisition and one the 3rd flat field information, one second light intensity is proofreaied and correct field pattern and one the 3rd light intensity is proofreaied and correct field pattern to calculate.Proofread and correct field pattern and the 3rd light intensity correction field pattern through second light intensity, can obtain pairing one second light intensity corrected rate of each image coordinate and one the 3rd light intensity corrected rate.
In the practical application, for desirable X optical filter, Y optical filter or the Z optical filter of optical filter emulation with existing specification, may with in the corresponding X optical filters of a plurality of optical filters, Y optical filter and the Z optical filter one of at least.For example, two first optical filters 2 can be set at CCD 100 and on reference to the rotating disk between the LED unit 1.These two first optical filters 2 are the optical filter of different size, after obtaining one first flat field information respectively, can calculate one first light intensity corrected rate repeating above-mentioned capture computing flow process.In like manner, the second optical filter 2a or the 3rd optical filter 2b more than two can be set also,, calculate described second light intensity corrected rate and the 3rd light intensity corrected rate with a plurality of second flat field information or the 3rd flat field information.
According to the pairing first light intensity corrected rate of each image coordinate that is calculated through the X optical filter, can calculate this and depart from and just throw in the detected image, each image coordinate pairing is proofreaied and correct the back light intensity value, uses to obtain a light intensity correct detection image.
Simultaneously; According to the pairing first light intensity corrected rate of each image coordinate that is calculated through X optical filter, Y optical filter and Z optical filter, the second light intensity corrected rate and the 3rd light intensity corrected rate; Can calculate respectively under each filter, this departs from and just throws the pairing one first light intensity corrected value of each image coordinate, one second light intensity corrected value and one the 3rd light intensity corrected value in the detected image.According to the coloured light principle,, can calculate each image coordinate pairing and proofread and correct back photochromism value according to this first light intensity corrected value, this second light intensity corrected value and the 3rd light intensity corrected value.
Proofread and correct back light intensity value and should proofread and correct back photochromism value through this, can obtain one light intensity/photochromism correct detection image, will depart from the lump and just throw the light intensity and the photochromism inequality that are caused and proofread and correct simultaneously.
See also Fig. 7, it is in second application examples of first embodiment of the invention, the illustrative view of the flat field correction method that two-dimension optical detects.Because it is difficult that desirable best sample obtains, makes, in the practical application, can form one with reference to the target of LED cell matrix 10 by a plurality of a plurality of with reference to random sampling in the LED unit as capture.As shown in the figure, be on detection platform 200, to be provided with reference to LED cell matrix 10, and mobile CCD 100 with reference to one of in the LED cell matrix 10, so that be to move relative to CCD 100 on the TCS in detection coordinates with reference to LED cell matrix 10.
Acquisition is with reference to the matrix individual image of LED cell matrix 10 at the relative position of a plurality of and CCD 100, and each matrix individual image is in image coordinate system ICS, to be positioned at the different images coordinate.Then; Detect a plurality of bright spot peak value coordinates of each matrix individual image on this image coordinate system ICS; And to total luminance value that should a plurality of bright spot peak value coordinates; Calculate this with reference in the LED cell matrix 10 to utilize these a plurality of matrix individual image to integrate, each is with reference to the flat field information of LED unit 1.
Then, the computing flow process in first embodiment, through this with reference to each calculates a plurality of light intensities respectively and proofread and correct field patterns with reference to the flat field information of LED unit 1 in the LED cell matrix 10.Should a plurality of light intensities proofread and correct field pattern average out to one main (Master) light intensity correction field pattern, and proofread and correct field pattern, calculate pairing this light intensity corrected rate of each image coordinate through this main light intensity.Thus, because the capturing result of the reference LED unit 1 of comprehensive a plurality of random samplings, can be with the harmful effect that is caused with reference to the flaw error of LED unit 1 respectively, extremely minimum through on average eliminating.
Then; In order further to promote the technology that the present invention disclosed; The technology that below will be further first embodiment and second embodiment of preferred embodiment of the present invention be disclosed converges that to put in order be a simple and easy process flow diagram, remembers more easily so that in affiliated technical field, have common knowledge the knowledgeable.
See also Fig. 8, it is in second application examples of first embodiment of the invention, the simple and easy process flow diagram of the flat field correction method that two-dimension optical detects.As shown in the figure, at first, make a plurality of reference LED cell matrixs of being formed with reference to LED unit 1 10, be that the image coordinate system ICS relative to CCD 100 moves (S101) on the TCS in detection coordinates.Then; Utilize CCD 100 to capture this with reference to the matrix individual image of LED cell matrix 10 in a plurality of image coordinate; And detect a plurality of bright spot peak value coordinates of each matrix individual image on this image coordinate system ICS, and to light intensity value (S102) that should a plurality of bright spot peak value coordinates.
Utilize this a plurality of matrix individual image, can calculate with reference in the LED cell matrix 10 each with reference to the flat field information (S103) of LED unit 1.Through being somebody's turn to do with reference to each can calculate a plurality of light intensities and proofread and correct field pattern (S104) with reference to the flat field message interpolation and the normalization of LED unit 1 in the LED cell matrix 10.Should a plurality of light intensities proofread and correct field pattern average out to one main (Master) light intensity correction field pattern, and proofread and correct the pairing light intensity corrected rate (S105) of field pattern each image coordinate of acquisition through this main light intensity.
During formal the detection; Utilize a plurality of luminophors 300 to be measured of CCD 100 acquisitions to depart from and just throw detected image (S106) with one of 300a; And according to the pairing light intensity corrected rate of each image coordinate; Calculate this and depart from and just throw in the detected image each image coordinate pairing and proofread and correct the back light intensity value, use obtaining a light intensity correct detection image (S107).
See also Fig. 9 and Fig. 9 A, it is among second embodiment of preferred embodiment of the present invention, the simple and easy process flow diagram of the flat field correction method that two-dimension optical detects.As shown in the figure; In the present embodiment; At first, one first optical filter 2 (S201) is set between a CCD 100 and is with reference to LED unit 1, and to make with reference to LED unit 1 be that the image coordinate system ICS relative to CCD 100 moves on the TCS in detection coordinates; Utilizing CCD 100 acquisition, and should a plurality of first other image integration be one first flat field information (S202) with reference to first individual image of LED unit 1 in a plurality of image coordinate.Through this first flat field information, can calculate one first light intensity and proofread and correct field pattern, use obtaining the pairing one first light intensity corrected rate (S203) of each image coordinate.
Then; With CCD 100 and with reference to first optical filter 2 between the LED unit 1; Substituting is one second optical filter 2a (S204), repeats above-mentioned flow process then, and making with reference to LED unit 1 is to move relative to CCD 100 on the TCS in detection coordinates; Calculate one second flat field information with acquisition, and calculate one second light intensity correction field pattern to obtain the pairing one second light intensity corrected rate (S205) of each image coordinate through this second initial pictures.
Likewise, with CCD 100 and with reference to the second optical filter 2a between the LED unit 1, substituting once again is one the 3rd optical filter 2b (S206).Making with reference to LED unit 1 is to move relative to CCD100 on the TCS in detection coordinates; Calculate one the 3rd initial pictures with acquisition, and calculate one the 3rd light intensity correction field pattern to obtain pairing one the 3rd light intensity corrected rate (S207) of each image coordinate through the 3rd initial pictures.
During formal the detection, utilize CCD 100 to capture a plurality of luminophors to be measured 300 respectively and just throw detected image (S208) with 300a departing under each optical filter.According to the pairing first light intensity corrected rate of each image coordinate, the second light intensity corrected rate and the 3rd light intensity corrected rate, can calculate respectively to depart from and just throw in the detected image, each image coordinate pairing is proofreaied and correct back photochromism value.Through proofreading and correct back photochromism value and proofreading and correct the back light intensity value, can obtain one light intensity/photochromism correct detection image (S209).
In prior art; Flat field correction image with uniform plane light source PA200 acquisition also can't be proofreaied and correct the uneven phenomenon of light intensity fully; And can't proofread and correct the problem of the uneven phenomenon of photochromism fully; The flat field correction method that two-dimension optical of the present invention detects is because with reference to LED unit 1 acquisition one initial pictures, and light intensity value after the correction that this initial pictures calculated can be thoroughly just throwed in the detected image inequality of light intensity and photochromism and proofreaied and correct departing from.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (20)
1. the flat field correction method that detects of a two-dimension optical is in order to proofread and correct a charge-coupled device (CCD) (Charge Coupled Device; CCD) induction at least one be arranged at a detection platform luminophor to be measured obtained one departs from and just throw detected image; This CCD be provided with one have a plurality of image coordinate image coordinate system; This detection platform be provided with one have a plurality of detection coordinates detection coordinates system; It is characterized in that the flat field correction method that this two-dimension optical detects comprises following steps:
(a) utilize this CCD to capture the individual image of at least one reference illuminant, and should a plurality of individual image be integrated into a flat field information in a plurality of image coordinate;
(b) calculate a light intensity through this flat field information and proofread and correct field pattern (Profile), use obtaining the pairing light intensity corrected rate of each image coordinate;
(c) this that utilizes this luminophor to be measured of this CCD acquisition departs from and just throws detected image; And
(d) according to the pairing light intensity corrected rate of each image coordinate, calculate this and depart from and just throw in the detected image each image coordinate pairing and proofread and correct the back light intensity value, use obtaining a light intensity correct detection image.
2. the flat field correction method that two-dimension optical according to claim 1 detects; It is characterized in that; Step (b) also comprises a step (b1), detects in this flat field information a plurality of bright spot peak value coordinates that should image coordinate system, and to light intensity value that should a plurality of bright spot peak value coordinates; With this flat field message interpolation and normalization (Normalization), use calculating this light intensity correction field pattern according to this.
3. the flat field correction method that two-dimension optical according to claim 1 detects; It is characterized in that; This luminophor to be measured is a LED to be measured unit or a flat luminous body to be measured, and this CCD departs from and just throws detected image to obtain this for induction a plurality of described LED to be measured unit or described one flat luminous body to be measured.
4. the flat field correction method that two-dimension optical according to claim 1 detects is characterized in that, this reference illuminant is one with reference to the LED unit or be provided with a reference planes luminophor of a shielding.
5. the flat field correction method that two-dimension optical according to claim 4 detects; It is characterized in that; Step (a) also comprises a step (a1), this is fastened relative to this CCD in this detection coordinates with reference to the LED unit move, to capture this with reference to the individual image of LED unit in a plurality of image coordinate.
6. the flat field correction method that two-dimension optical according to claim 4 detects; It is characterized in that; Step (a) also comprises a step (a2); Make and a plurality ofly describedly one fastened relative to this CCD in this detection coordinates with reference to the LED cell matrix and to move, capturing this, and detect a plurality of bright spot peak value coordinates that each matrix individual image is fastened in this image coordinate with reference to the matrix individual image of LED cell matrix in a plurality of image coordinate with reference to what the LED unit formed; And to light intensity value that should a plurality of bright spot peak value coordinates, with utilize these a plurality of matrix individual image calculate this with reference in the LED cell matrix each with reference to the flat field information of LED unit.
7. the flat field correction method that two-dimension optical according to claim 6 detects is characterized in that step (a) also comprises a step (a3), through this with reference to each calculates a plurality of light intensities and proofread and correct field patterns with reference to the flat field information of LED unit in the LED cell matrix.
8. the flat field correction method that two-dimension optical according to claim 7 detects; It is characterized in that; Step (a) also comprises a step (a4); Should a plurality of light intensities proofread and correct field pattern average out to one main (Master) light intensity correction field pattern, and proofread and correct pairing this light intensity corrected value of field pattern each image coordinate of acquisition through this main light intensity.
9. the flat field correction method that detects of a two-dimension optical is in order to proofread and correct a charge-coupled device (CCD) (Charge Coupled Device; CCD) induction at least one be arranged at a detection platform luminophor to be measured obtained one departs from and just throw detected image; This CCD be provided with one have a plurality of image coordinate image coordinate system; This detection platform be provided with one have a plurality of detection coordinates detection coordinates system; It is characterized in that the flat field correction method that this two-dimension optical detects comprises following steps:
(a) at least one first optical filter is set between this CCD and at least one reference illuminant;
(b) utilize first individual image of this this reference illuminant of CCD acquisition, and should a plurality of first other image integration be one first flat field information in a plurality of image coordinate;
(c) calculate one first light intensity through this first flat field information and proofread and correct field pattern (Profile), use obtaining the pairing one first light intensity corrected value of each image coordinate;
(d) this that utilizes this luminophor to be measured of this CCD acquisition departs from and just throws detected image; And
(e) according to the pairing first light intensity corrected value of each image coordinate, calculate this and depart from and just throw in the detected image each image coordinate pairing and proofread and correct the back light intensity value, use obtaining a light intensity correct detection image.
10. the flat field correction method that two-dimension optical according to claim 9 detects; It is characterized in that; Step (c) also comprises a step (c1), detects this first flat field information to a plurality of first bright spot peak value coordinates that should image coordinate system, and to first light intensity value that should a plurality of first bright spot peak value coordinates; With this first flat field message interpolation and normalization (Normalization), use calculating this first light intensity correction field pattern according to this.
11. the flat field correction method that two-dimension optical according to claim 9 detects; It is characterized in that; Step (c) also comprises a step (c2); At least one second optical filter is set between this CCD and this reference illuminant, capturing the one second flat field information of this reference illuminant, and calculates one second light intensity through this second flat field information and proofread and correct field pattern to obtain the pairing one second light intensity corrected rate of each image coordinate in a plurality of image coordinate.
12. the flat field correction method that two-dimension optical according to claim 11 detects; It is characterized in that; Step (c) also comprises a step (c3); At least one the 3rd optical filter is set between this CCD and this reference illuminant, capturing the one three flat field information of this reference illuminant, and calculates one the 3rd light intensity through the 3rd flat field information and proofread and correct field pattern to obtain pairing one the 3rd light intensity corrected rate of each image coordinate in a plurality of image coordinate.
13. the flat field correction method that two-dimension optical according to claim 12 detects; It is characterized in that; Step (e) also comprises a step (e1); According to the pairing first light intensity corrected rate of each image coordinate, the second light intensity corrected rate and the 3rd light intensity corrected rate, calculate this and depart from and just throw in the detected image each image coordinate pairing and proofread and correct back photochromism value, with through this corrections back light intensity value and this correction afterwards the photochromism value obtain one light intensity/photochromism correct detection image.
14. the flat field correction method that two-dimension optical according to claim 13 detects; It is characterized in that; This at least one first optical filter, this at least one second optical filter and this at least one the 3rd optical filter; Difference a corresponding X optical filter, a Y optical filter and a Z optical filter, the tristimulus values in described this X optical filter, this Y optical filter and this Z optical filter corresponding CIE color matching function of difference (Color-Matching Functions).
15. the flat field correction method that two-dimension optical according to claim 9 detects; It is characterized in that; This luminophor to be measured is a LED to be measured unit or a flat luminous body to be measured; This CCD responds to a plurality of described LED to be measured unit or described one flat luminous body to be measured, departs from and just throws detected image to obtain this.
16. the flat field correction method that two-dimension optical according to claim 9 detects is characterized in that, this reference illuminant is one with reference to the LED unit or be provided with a reference planes luminophor of a shielding.
17. the flat field correction method that two-dimension optical according to claim 16 detects; It is characterized in that; Step (a) also comprises a step (a1), this is fastened relative to this CCD in this detection coordinates with reference to the LED unit move, to capture this with reference to the individual image of LED unit in a plurality of image coordinate.
18. the flat field correction method that two-dimension optical according to claim 16 detects; It is characterized in that; Step (b) also comprises a step (b1); Make and a plurality ofly describedly one fastened relative to this CCD in this detection coordinates with reference to the LED cell matrix and to move, capturing this, and detect a plurality of bright spot peak value coordinates that each first matrix individual image is fastened in this image coordinate with reference to the first matrix individual image of LED cell matrix in a plurality of image coordinate with reference to what the LED unit formed; And to light intensity value that should a plurality of bright spot peak value coordinates, with utilize these a plurality of first matrix individual image calculate this with reference in the LED cell matrix each with reference to the first flat field information of LED unit.
19. the flat field correction method that two-dimension optical according to claim 18 detects; It is characterized in that; Step (b) also comprises a step (b2), through this with reference to each calculates a plurality of first light intensities and proofread and correct field patterns with reference to the first flat field information of LED unit in the LED cell matrix.
20. the flat field correction method that two-dimension optical according to claim 19 detects; It is characterized in that; Step (b) also comprises a step (b3); Should a plurality of first light intensities proofread and correct field pattern average out to one first main (Master) light intensity correction field pattern, and proofread and correct pairing this first light intensity corrected rate of field pattern each image coordinate of acquisition through this first main light intensity.
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| US20210287397A1 (en) * | 2020-03-13 | 2021-09-16 | Cheng Mei Instrument Technology Co., Ltd. | Image calibration method for imaging system |
| TWI753554B (en) * | 2020-08-28 | 2022-01-21 | 致茂電子股份有限公司 | Method for automatically adjusting electronic equipment |
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