CN101566504B - Method and device for measuring laser speckles - Google Patents
Method and device for measuring laser speckles Download PDFInfo
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- CN101566504B CN101566504B CN 200810105067 CN200810105067A CN101566504B CN 101566504 B CN101566504 B CN 101566504B CN 200810105067 CN200810105067 CN 200810105067 CN 200810105067 A CN200810105067 A CN 200810105067A CN 101566504 B CN101566504 B CN 101566504B
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Abstract
The invention relates to a device and a method for measuring laser speckles. The device comprises a signal receiving unit, a correcting unit and a computing unit. For a display system adopting multicolor laser, the device also comprises a color separator for separating mixed light formed by the multicolor laser lights according to wavelengths. The method corrects laser speckle images through response curves of the laser light with each wavelength by using a human eye and the signal receiving unit, and obtains measurement parameters of the speckles based on human eye response.
Description
Technical field
The present invention relates to metering field, be specifically related to a kind of metering method and device that is used for the laser speckle in laser display field.
Background technology
Laser speckle is prevalent in the optical imagery, it forms reason and is: because the coherence preferably of laser, when laser incides object surfaces, because its surface also is coarse with respect to optical maser wavelength, therefore the light wave of incident is divided into a plurality of relevant wavelets and reflects, and these relevant wavelets produce on the surface of human eye or detector interferes and form speckle image.
Exist by optical theory in the prior art and calculate the statistics radius of laser speckle and the method for contrast based on the light distribution in the speckle pattern, for example, published by Science Press in 1981, the red Supreme Being of J.C. writes, contrast (being equivalent to contrast) of " laser speckle and relevant phenomenon " middle speckle pattern of yellow translation such as carefree can use
Calculate, wherein σ
IBe the average variance of light intensity,＜I〉be average intensity.Calculate autocorrelation function G=＜I (x and describe in detail by light distribution in the interim article of " optics and photoelectric technology " the 6th volume the 1st " based on the measurement of the laser speckle statistics radius of autocorrelation function "
1, y
1) I (x
2, y
2), and calculate the method for adding up radius thus.
The light source that the laser display field is adopted is many primary colours laser instrument, the image of showing out to the projection of image receiving unit as the laser of coherent light, because the surface of image receiving unit also is coarse, therefore can produce laser speckle equally with respect to optical maser wavelength.In the demonstration field, speckle is that people do not want to see, and the degree of reflection laser speckle also to be reaction with human eye be as the criterion.In recent years, people were devoted to how to weaken this speckle always, judge what degree speckle is attenuated to actually, found a kind ofly to realize speckle accurately the method for metering is particularly important.Finish speckle measuring, at first to gather speckle image, people can expect going to achieve the above object with CCD naturally, and people also find to utilize colour splitting prism that the redgreenblue light in the image is separated, and receive (being 3-CCD) by CCD separately and help processing respectively three coloured light signals, and remedied traditional colored CCD to lose the deficiency that resolution is the collection of cost realization colour signal, as publication number is EP0959618, disclose a kind of imaging system in the european patent application of " multistage electronics moves image capture device and disposal system " by name, this system comprises prism, be used for light is divided into the color separation prism of three kinds of compositions of RGB.Also have similarly a lot of patents respectively the signal of CCD picked-up to be carried out various optimizations and rectification, make the image that finally obtains seem that color is gorgeous, contrast is high.But in the laser display field, the yardstick of laser speckle is standard with the human eye,
Therefore in the speckle measuring in laser display field, adopt above-mentioned CCD acquisition system of the prior art to be used for gathering speckle image and have following shortcoming:
There is an eye response curve in human eye to the response of the light of various wavelength, and 3-CCD imaging system of the prior art is not considered this point, and just pursue specification on the picture qualities such as colourity or brightness, can't truly reflect the response of human eye to speckle image.
Summary of the invention
Because the deficiencies in the prior art, the present invention proposes a kind ofly can accurately to measure, and can obtain measuring apparatus and method with the corresponding to laser speckle image of the response of human eye.
On the one hand, the invention provides a kind of laser speckle measuring apparatus, comprise
Signal receiving unit, the light distribution signal that is used to receive laser speckle and received laser speckle image is converted to laser speckle;
Correcting unit is used for the light distribution signal of described laser speckle is corrected;
Computing unit is used for the parameter according to the light distribution calculated signals sign laser speckle characteristic after correcting.
Above-mentioned laser speckle measuring apparatus, wherein, described laser speckle is formed by single wavelength laser, and described signal receiving unit is the CCD that comprises a plurality of pixels.
Above-mentioned laser speckle measuring apparatus, wherein, described laser speckle is formed by a plurality of wavelength lasers, and described measuring apparatus also comprises the color separation device, is used for the laser speckle of each wavelength is separated.
Above-mentioned laser speckle measuring apparatus, wherein, described signal receiving unit is a plurality of CCD that comprise a plurality of pixels, each CCD adapts to the laser speckle that receives the wavelength that described color separation device tells.
Above-mentioned laser speckle measuring apparatus,, described correcting unit is determined the compensation coefficient of each wavelength respectively to the response curve of the laser of wavelength that described CCD receives according to each CCD and human eye.
Above-mentioned laser speckle measuring apparatus, described correcting unit multiply by the received light intensity of each pixel of corresponding CCD respectively to realize the rectification to the light distribution signal with the compensation coefficient of each described wavelength.Above-mentioned laser speckle measuring apparatus, the parameter of wherein said sign laser speckle characteristic comprises speckle contrast.
Above-mentioned laser speckle measuring apparatus, the parameter of wherein said sign laser speckle characteristic also comprise the autocorrelation function that characterizes speckle statistics radius.
On the other hand, the invention provides a kind of laser speckle metering method, may further comprise the steps:
1) receives laser speckle and also convert received speckle image to speckle light distribution signal;
2) described speckle light distribution signal is corrected;
3) characterize the parameter of speckle characteristic according to the light distribution calculated signals after correcting.
Above-mentioned laser speckle metering method wherein also comprised before step 1):
1.0) laser speckle is carried out separation steps by different wave length.
Above-mentioned laser speckle metering method, wherein step 2) comprising:
2.1) element that receives speckle according to human eye and being used to determines the compensation coefficient of each wavelength laser speckle to the response curve of each wavelength;
2.2) intensity of each pixel in the laser speckle intensity distributions of each wavelength be multiply by compensation coefficient.
Above-mentioned laser speckle metering method, the wherein said element that is used to receive speckle is one or more CCD.
Above-mentioned laser speckle metering method, wherein the parameter of the sign laser speckle characteristic in the step 3) comprises speckle contrast.
Above-mentioned laser speckle metering method, wherein the parameter of the sign laser speckle characteristic in the step 3) comprises the autocorrelation function that characterizes speckle statistics radius.
Adopt technical scheme of the present invention, have following beneficial effect:
1, because the metering method of the laser speckle that is used for laser display among the present invention is separated into the speckle image corresponding with each wavelength with a white speckle image by its optical wavelength composition, and correction process is carried out in the response of the light of various wavelength respectively according to human eye, make that the speckle measuring that calculates is consistent with the eye response of human eye;
2, in the speckle measuring method of the present invention, speckle contrast and the autocorrelation function that characterizes speckle statistics radius are combined as final speckle measuring amount, contained the sensation of human eye more all sidedly, make the speckle measuring amount more comprehensively speckle image.
Description of drawings
Fig. 1 shows an embodiment who is used for the laser speckle measuring apparatus and the method for laser display system according to of the present invention.
Fig. 2 shows another embodiment that is used for the laser speckle measuring apparatus and the method for laser display system according to of the present invention.
Embodiment
Embodiment 1
Fig. 1 shows an embodiment who is used for the laser speckle measuring apparatus and the method for laser display system according to of the present invention, comprising: display plane 1, lens combination 2, signal receiving unit (being the black-white CCD 4 that comprises a plurality of pixels in an embodiment), correcting unit 5 and counter 6.Show the λ 1 laser speckle image that produces by the single wavelength light field on the display plane 1, lens combination 2 is used for making the laser speckle image to be imaged on the CCD4, CCD4 receives λ 1 laser speckle picture signal, and converting thereof into the electric signal that characterizes each pixel light intensity of CCD4, we are referred to as the light distribution signal among the present invention.Correcting unit 5 is used for receiving the light distribution signal of λ 1 laser speckle, and it is carried out rectification based on CCD4 response and human eye vision response, and counter 6 is used to receive the signal after the correction process and calculates the metered amount of measurement laser speckle.
Before the metering method of introducing speckle in detail, the formation of speckle is described at first.In the present embodiment, the laser of laser display apparatus output single wavelength, this laser radiation supposes that optical wavelength is λ 1 to display plane.Because the relative coarse of the coherence of same wavelength laser and display plane causes producing laser speckle,, below be called λ 1 laser speckle image so on display plane, can produce the laser speckle image corresponding with light wavelength lambda 1.
, comprise the steps: the method that laser speckle measures below with reference to description shown in Figure 1
Step 1: the 1 laser speckle image scioptics group of the λ on the display plane is imaged onto on the black-white CCD 4 for 2 groups, obtains the two-dimensional illumination intensity distribution signal.
Step 2: correcting unit receives the two-dimensional illumination intensity distribution signal of λ 1 laser speckle of black-white CCD 4 outputs, and carries out correction process, the two-dimensional illumination intensity distribution of the λ 1 laser speckle image after obtaining correcting.
Wherein correcting unit detailed process that the two-dimensional illumination intensity distribution of λ 1 laser speckle image is carried out correction process can adopt as follows:
Step 201:, determine that human eye is the susceptibility of the light field of λ 1 to wavelength, is assumed to be X1 according to the eye sensitivity curve (being that human eye is to the susceptibility of light and the corresponding relation of various optical wavelength) of human eye; By the response curve of CCD4, determine that CCD4 is the susceptibility of the light field of λ 1 to wavelength, is assumed to be Y1 to the light of various wavelength.
Step 202: correcting unit all is multiplied by compensation coefficient X1/Y1 with the light intensity of each pixel in the two-dimensional illumination intensity distribution.
λ 1 two-dimensional illumination intensity distribution signal after so just having obtained correcting.
Step 3: λ 1 light distribution after computing unit is corrected from the correcting unit reception, calculate the speckle contrast P after correcting
1, the method for calculating speckle contrast adopts method of the prior art.
Step 4: computing unit calculates the autocorrelation function G that the speckle after correcting is calculated in λ 1 light distribution that utilizes after correcting
1The method of calculating autocorrelation function is to carry out according to the computing method of autocorrelation function of the prior art.
Owing to disclosed the statistics radius that can calculate speckle by autocorrelation function in the prior art, therefore can be used for characterizing speckle statistics radius by autocorrelation function.
Like this, just obtained characterizing the variable (P of laser display apparatus speckle degree
1, G
1).
Fig. 2 shows according to a kind of embodiment that is used for the laser speckle measuring apparatus of laser display system of the present invention, comprising: display plane 1, lens combination 2, color separation device 3, a plurality of black-white CCD 4, correcting unit 5 and counter 6.Wherein display plane 1 be used for showing by λ 1 laser speckle image ... the white speckle image of a width of cloth that λ m laser speckle image is synthetic, m 〉=2.Lens combination 2 is used for making white speckle image to be imaged on the color separation device 3.Color separation device 3 be used for according to synthetic white multiple color light wavelength will a white speckle image be divided into λ 1 laser speckle image ... λ m laser speckle image, m black-white CCD 4 receive respectively λ 1 laser speckle image ... λ m laser speckle image, and obtain λ 1 light distribution signal ... λ m light distribution signal.Correcting unit 5 be used to receive λ 1 light distribution signal that CCD4 sends ... λ m light distribution signal, carry out after correction process obtains correcting λ 1 laser speckle image ... the light distribution signal after the rectification separately of λ m laser speckle image.Counter 6 is used to receive the light distribution signal after the rectification of each wavelength, and calculates the metered amount of weighing laser speckle.
Before the metering method of introducing speckle in detail, the formation of speckle is described at first.With reference to Fig. 2, a wherein white light by multiple color (being a plurality of wavelength) mixes white of laser display apparatus output to display plane, and promptly the light source of laser display apparatus comprises the laser instrument that produces multiple color laser respectively.Might as well suppose to have m kind color (m 〉=2), its optical wavelength be respectively λ 1 ... λ m.Because the coherence of same wavelength laser and display plane relative coarse causes producing laser speckle, so the light of corresponding each wavelength all can produce laser speckle image separately on display plane, below be called λ 1 laser speckle image ... the white speckle image of the finally synthetic width of cloth of λ m laser speckle image, these speckle images is presented on the display plane.
Below with reference to Fig. 2 the metering method that is used for the laser speckle of laser display apparatus of the present invention is described, its step comprises:
Step 1: white speckle image scioptics group 2 on the display plane is imaged onto on the color separation device 3.
Step 2: color separation device 3 is according to synthetic white multiple color light wavelength, with the picture of white speckle image be separated into λ 1 laser speckle image ... λ m laser speckle image, color separation device 3 can be a colour splitting prism etc.
Step 3: utilize m black-white CCD 4 receive respectively λ 1 laser speckle image ... λ m laser speckle image, obtain the two-dimensional illumination intensity distribution of each wavelength, hereinafter referred to as λ 1 light distribution signal ... λ m light distribution signal;
Step 4: λ 1 light distribution of m black-white CCD of correcting unit 5 receptions 4 outputs ... λ m light distribution, and carry out correction process, λ 1 light distribution after obtaining correcting ... λ m light distribution.
Wherein, 5 couples of λ of correcting unit, 1 laser speckle image ... the detailed process that the two-dimensional illumination intensity distribution separately of λ m laser speckle image is carried out correction process can adopt following step:
Step 401: according to the eye sensitivity curve (being that human eye is to the susceptibility of light and the corresponding relation of various optical wavelength) of human eye, determine human eye to wavelength be λ 1 ... the susceptibility of the light field of λ m, be assumed to be X1 ... Xm; By the response curve of CCD to the light of various wavelength, determine CCD to wavelength be λ 1 ... the susceptibility of the light field of λ m, be assumed to be Y1 ... Ym;
Step 402: correcting unit 5 all is multiplied by compensation coefficient X1/Y1 with the corresponding light intensity of each pixel in the light distribution of wavelength X 1, by that analogy, with wavelength X 2 ... each the pixel light intensity in the light distribution of λ m all be multiplied by separately compensation coefficient X2/Y2 ... Xm/Ym;
λ 1 light distribution signal after so just having obtained correcting ... λ m light distribution signal.
Step 5: the λ 1 light distribution signal after computing unit 6 is corrected from correcting unit 5 receptions ... λ m light distribution signal, the λ 1 light distribution signal after utilization is corrected respectively ... the speckle contrast P of each wavelength of λ m light distribution calculated signals after the rectification
1... P
mThe method of calculating speckle contrast adopts method of the prior art.
Step 6: the λ 1 light distribution signal after computing unit 6 utilizations are corrected ... the autocorrelation function G of the speckle of each wavelength of λ m light distribution calculated signals after the rectification
1... G
mThe method of calculating autocorrelation function is to carry out according to the definition of autocorrelation function of the prior art.
Owing to disclosed the statistics radius that can calculate speckle by autocorrelation function in the prior art, therefore can be used for characterizing speckle statistics radius by autocorrelation function.
Like this, just obtained characterizing the variable (P of laser display apparatus speckle degree
1, G
1) ... (P
m, G
m).
Should illustrate, among the present invention the statistics radius of laser speckle and contrast be calculated and to adopt any calculating speckle statistics radius commonly used in this area and the method for contrast.
Though, utilize CCD that speckle signals is received in the embodiments of the invention, in fact CCD is an example of speckle receiving element, can also adopt other signal receiving unit that comprises a plurality of pixels that speckle signals is received.
Although the present invention specifically describes with reference to top preferred embodiment, yet, it should be appreciated by those skilled in the art, the any modification on basis of the present invention, carried out or equal the replacement, the spirit and scope that do not break away from technical solution of the present invention all should be encompassed in the claim scope of the present invention.
Claims (11)
1. a laser speckle measuring apparatus comprises
Signal receiving unit, the light distribution signal that is used to receive laser speckle and received laser speckle image is converted to laser speckle; Described signal receiving unit comprises at least one CCD;
Correcting unit is used for the light distribution signal of described laser speckle is corrected; Wherein,
Described correcting unit is determined first susceptibility of human eye to the laser of a certain wavelength that any one CCD received among described at least one CCD according to the eye sensitivity curve of human eye, according to described CCD the response curve of the light of various wavelength is determined that any one CCD among described at least one CCD is to second susceptibility of the laser of the described a certain wavelength that received, as compensation coefficient, the light intensity of laser that described compensation coefficient be multiply by the received described a certain wavelength of each pixel of described any one CCD is to realize the rectification to the light distribution signal by the ratio of described first susceptibility and described second susceptibility;
Computing unit is used for the parameter according to the light distribution calculated signals sign laser speckle characteristic after correcting.
2. laser speckle measuring apparatus as claimed in claim 1, wherein, described laser speckle is formed by single wavelength laser, and described signal receiving unit is the CCD that comprises a plurality of pixels.
3. laser speckle measuring apparatus as claimed in claim 1, wherein, described laser speckle is formed by a plurality of wavelength lasers, and described measuring apparatus also comprises the color separation device, is used for the laser speckle of each wavelength is separated.
4. laser speckle measuring apparatus as claimed in claim 3, wherein, described signal receiving unit is a plurality of CCD that comprise a plurality of pixels, each CCD adapts to the laser speckle that receives the wavelength that described color separation device tells.
5. as the described laser speckle measuring apparatus of one of claim 1-4, the parameter of wherein said sign laser speckle characteristic comprises speckle contrast.
6. as the described laser speckle measuring apparatus of one of claim 1-4, the parameter of wherein said sign laser speckle characteristic also comprises the autocorrelation function that characterizes speckle statistics radius.
7. the method for laser speckle measuring apparatus metering laser speckle according to claim 1 may further comprise the steps:
1) receives laser speckle and also convert received speckle image to speckle light distribution signal;
2) described speckle light distribution signal is corrected; This step comprises: determine first susceptibility of human eye to the laser of a certain wavelength that any one CCD received among described at least one CCD according to the eye sensitivity curve of human eye, according to described CCD the response curve of the light of various wavelength is determined that any one CCD among described at least one CCD is to second susceptibility of the laser of the described a certain wavelength that received, as compensation coefficient, the light intensity of laser that described compensation coefficient be multiply by the received described a certain wavelength of each pixel of described any one CCD is to realize the rectification to the light distribution signal by the ratio of described first susceptibility and described second susceptibility;
3) characterize the parameter of speckle characteristic according to the light distribution calculated signals after correcting.
8. laser speckle metering method as claimed in claim 7 wherein also comprised before step 1): 1.0) laser speckle is carried out separation steps by different wave length.
9. as claim 7 or 8 described laser speckle metering methods, the wherein said element that is used to receive speckle is one or more CCD.
10. as claim 7 or 8 described laser speckle metering methods, wherein the parameter of the sign laser speckle characteristic in the step 3) comprises speckle contrast.
11. as claim 7 or 8 described laser speckle metering methods, wherein the parameter of the sign laser speckle characteristic in the step 3) comprises the autocorrelation function that characterizes speckle statistics radius.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384836B (en) * | 2010-09-01 | 2014-01-29 | 中国科学院光电研究院 | Laser multi-parameter real-time measuring device |
| IN2014DN03014A (en) * | 2011-09-26 | 2015-05-08 | Univ Johns Hopkins | |
| CN103673912A (en) * | 2013-12-07 | 2014-03-26 | 中国民航大学 | Image correcting system for deformation measurement of speckle correlation methods |
| CN103995364B (en) * | 2014-05-26 | 2016-11-23 | 中国科学技术大学 | The processing method and processing device of secondary color laser speckle image |
| CN107735015B (en) * | 2015-05-07 | 2021-09-10 | 史赛克欧洲运营有限公司 | Method and system for laser speckle imaging of tissue using a color image sensor |
| CN105203028B (en) * | 2015-10-10 | 2018-08-31 | 杭州中科极光科技有限公司 | The measuring system and measurement method of laser image speckle based on human eye feature |
| US10813597B2 (en) * | 2017-04-14 | 2020-10-27 | The Regents Of The University Of California | Non-invasive hemodynamic assessment via interrogation of biological tissue using a coherent light source |
| CN108007677B (en) * | 2017-12-27 | 2023-10-27 | 杭州远方光电信息股份有限公司 | Laser projection speckle measurement system |
| CN111795800B (en) * | 2020-06-03 | 2023-06-06 | 杭州三泰检测技术有限公司 | Visual speckle contrast measuring device and method |
| CN111766047B (en) * | 2020-06-03 | 2022-12-09 | 杭州三泰检测技术有限公司 | Laser display visual speckle detection device for simulating human eyes |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0392742B1 (en) * | 1989-04-10 | 1995-06-28 | Kowa Company Ltd. | Ophthalmological measurement method and apparatus |
| CN1696661A (en) * | 2004-05-12 | 2005-11-16 | 中国科学院长春光学精密机械与物理研究所 | Interferometry method of laser speckle, and equipment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0392742B1 (en) * | 1989-04-10 | 1995-06-28 | Kowa Company Ltd. | Ophthalmological measurement method and apparatus |
| CN1696661A (en) * | 2004-05-12 | 2005-11-16 | 中国科学院长春光学精密机械与物理研究所 | Interferometry method of laser speckle, and equipment |
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