CN109443113A - Colored one camera polarization imaging method point of impact coordinate test method and system - Google Patents
Colored one camera polarization imaging method point of impact coordinate test method and system Download PDFInfo
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- CN109443113A CN109443113A CN201811272237.XA CN201811272237A CN109443113A CN 109443113 A CN109443113 A CN 109443113A CN 201811272237 A CN201811272237 A CN 201811272237A CN 109443113 A CN109443113 A CN 109443113A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B35/00—Testing or checking of ammunition
- F42B35/02—Gauging, sorting, trimming or shortening cartridges or missiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
Abstract
The invention discloses a kind of colored one camera polarization imaging method point of impact coordinate test methods, object reflected light is by two sides mirror plane mirror in validity test region, then the convergence of different colours reflected light is imaged in into colored area array cameras after polarization manipulation, according to color filter type and interpolation algorithm, red image and blue image are finally inversed by from blending image, it is equivalent to and red reflex light and blue reflected light is imaged respectively using two CCD cameras, it is as a result identical with double CCD intersection measuring principles.The present invention proposes polarization imaging method, while obtaining 0 °, 45 °, 90 ° and 135 ° of polarization image, to obtain degree of polarization and angle of polarization image to inhibit to interfere.The present invention proposes single color camera optical spectroscopy, active background illumination light splitting obtains red, blue dichromatism blending image, monochrome image is finally inversed by after resolving, monochromatic pulses active illumination technology can shorten the time for exposure, promote camera ability, improve camera amplitude-frequency and target velocity mismatches, the fuzzy and trailing phenomenon of appearance.
Description
Technical field
The present invention relates to conventional weapon point of impact coordinate measurement fields, specifically apply active pulsing light colour one camera
Polarization imaging measuring technique, specifically for a kind of colored one camera polarization imaging method point of impact coordinate test method.
Background technique
Point of impact detection technique has in weapon is studied, daily target practice is trained and has been widely used, and point of impact precision
Test is a very important link during weapon development, verification, detection etc., is research weapon-shooting precision, evaluation force
The key equipment of device system effectiveness.Often through artificial interpretation indication of shots in traditional point of impact detection, timeliness is low, accuracy
Influenced and be difficult to ensure by human factor and target sheet resolution ratio, be increasingly unable to satisfy the test of current weapon system and
The high request of military training.As sensor technology is fast-developing, for example, acoustoelectric sensor, the development of photoelectric sensor, so that
Present impact point detecting method to the automatic measurement direction development such as sound, light, electricity, wherein mainly have coil target, acoustic-electric positioning target,
The measuring system of a series of new such as light curtain target, CCD optical target, optical fiber code target.Photoelectricity test technology is as shooting range measurment skill
A part of art, such as sky, light curtain target photoelectric measurement technology have clearly compared with other weapon measuring technologies
Feature, such as non-contact, high-precision, real-time, automaticity are high, safety height etc., and make original some ginsengs being unable to measure
Number becomes possible now, measurement while having been realized in trajectory multiple parameters currently with photoelectric detecting technology.
Photoelectric detecting technology is that optical signalling is detected using electronic technology, then passes through photodetector device
Optical signalling (light flux variations) is transformed to electric signal, then further across hardware circuit amplification, signal processing to reach
Export the purpose of electric signal.The system of Photoelectric Detection includes the processor of signal, light-receiving device (light-sensitive element), light source, in reality
Light-sensitive element induction light source impinges upon the variation of luminous flux on detector in detection process, then turns luminous flux by photoelectric conversion
Become the variation of electric signal, the measurement to various amounts is finally realized by a series of Electric signal processing.This measurement method tool
There are high-timeliness, high-precision, non-cpntact measurement.When measuring bullet, bullet can cause light in light curtain to be believed by light curtain
Number variation, the speed of bullet or the coordinate of bullet incidence then can be reflected after converted processing, so with weapon skill
The development of art and military urgent need, the frequency of arm discharge bullet is higher and higher, measures bullet by photoelectric detecting technology
The advantages of target of ball, increasingly highlights, concern of the research by lot of domestic and foreign unit and company for this technology,
And liked deeply by weapons test industry testing crew.The country for photoelectric detecting technology measurement weapon performance research from 1985
Year starts, and there are Institutes Of Technology Of Nanjing, Northcentral University, Xi'an Technological University, armored force engineering university, Chinese soldier in main research institution
Device equips the units such as research institute.What photoelectric detecting technology was used to play point coordinate measurement is broadly divided into sky, light curtain target, CCD
Imaging method etc..
Xi'an Technological University is especially deep for the research of more light curtain sky screens, such as the LB-1 type day that the school develops
Curtain fire measuring system, XGK-05 type sky screen, four light curtain sky of XGK-06-4 type, and increase again on the basis of four light curtains
Add several light curtains, constitutes more light curtain sky screens such as more light curtain sky screen structures, such as six light curtains, it is oblique to solve trajectory
Penetrate, be addressed the four larger problems of light curtain sky measurement error, major product have XGK-05 type sky screen measuring system,
Four light curtain precision target of XGK-06-4 type, six light curtain precision target of XGK-2006 type etc..
Combination light curtain target generallys use laser or the mode of infrared light curtain combination constructs light-controlled switch system and played
Point coordinate measurement, as Institutes Of Technology Of Nanjing Yu Jiyan et al. in 2010 based on the mode for extracting the target moment, propose line and swash
The combination light curtain target of light reflection structure " Z " type, relative position worst error are 1mm；Northcentral University Zhang Jianping et al. proposes one
The point of impact coordinate test method of kind " N " type light curtain, ideal coordinates measuring accuracy can be better than ± 2.5mm；In addition, also by laser
Be shaped to triangle sector optical curtain, be combined into small area triangle light curtain or big triangle light curtain, as armored force engineering institute what
The large area cam combination light curtain of triumphant equality people research, solves the problems, such as the test of ultrahigh radio frequency barrage weapon vertical target dispersion,
Have the characteristics that light curtain area is big, precision is high, easy for installation.
CCD imaging method mainly by double CCD cross standing target measurement and list CCD retroreflector formula measurement two kinds, Northcentral University
Ceng Guang's space et al. proposes CCD imaging method the method that twin-line array CCD Convergent measurement founds target, after tested bullet coordinate measurement essence
It spends very ideal；Also there is research in Xi'an Technological University for double CCD measuring principles, such as CCD precision in XGK-CCD-1000 type room
Target, Xue Shulei et al. for CCD Intersection Measuring System initial alignment it is difficult the problems such as, propose it is a kind of based on measurement model from
Dynamic scaling method, measurement accuracy can reach 4mm, since double CCD cross vertical target there are some difficult to install, have researcher to propose
Single CCD retroreflector formula measurement method mainly has the Ma Weihong et al. of Northcentral University Huo Han etc. and Xi'an Technological University, proposes
Using 3 known coordinate points, the imaging position of real image and the virtual image is then utilized, the Each External parameter for calculating system obtains bullet
Ball target coordinate, improves measuring accuracy and efficiency.
Double CCD vertical target that crosses is exactly as shown in Fig. 5 a, Fig. 5 b, to place two in perpendicular according to human eye vision principle
A linear array CCD camera, the optical axis of two cameras meet at space certain point, a vertical photoelectric measurement target surface are constituted, with two cameras
Optical centre line is X-axis, using the axis perpendicular to line as Y-axis.When the bullet of high-speed flight by it is some on target surface when, bullet
Ball can form partial occlusion to bias light, respectively have a picture point to put in two CCD cameras with this corresponding, then by image
Adjustment method is handled to obtain bullet center image pixel coordinate, so by coordinate system conversion calculate bullet target position
Coordinate, thus pill impacting point coordinate can be found out by two CCD camera imaging points come.
As a kind of non-contact type photoelectricity measuring technology, double CCD cross vertical target structure it is simple, measurement accuracy and preceding several
Method compares accuracy measurement that is higher, therefore being capable of precise measurement bullet, is well suited for shooting range measurment, therefore for China target range
The raising of testing level and the development of new weapon have great importance.Two CCD of structural requirement but double CCD cameras cross
Visual field will be adjusted in approximately the same plane, this process is relatively difficult, be easy to cause to survey since vertical target structure deviation introduces error
Error is measured, and double camera equipment cost is higher.
Single CCD point of impact measuring technology.Deficiency present in vertical target is crossed for double CCD and restricts it in range test
Popularization, there is colleges and universities researcher to propose single CCD standing target measurement principle, as shown in fig. 6, the structure is by a line array CCD phase
Machine, pastes " L " type retroreflector film composition on a linear light source laser and target holder, laser line generator A by laser impinge upon it is former to
On reflectance coating, when there is bullet high speed to pass through, the light that can be emitted on reflectance coating is sheltered from, and is formed B point, can be used at this time
CCD receives other the most of light returned on retroreflector film, forms the projection B ' an of bullet on such CCD, and bullet
E itself can also be taken by CCD, be calculated as E '.Therefore two pictures received in target geometrical relationship and CCD are found using single CCD
Point coordinate can calculate bullet target coordinate.
Single CCD founds target method of testing compared with double CCD Convergence methods, does not need for two CCD to be placed in the same visual field, structure
Simpler, at low cost, installation and debugging are simpler, can quickly and accurately demarcate to the parameters of system.
That there are problems is as follows for the above method:
1, structure is complicated, installation and debugging are inconvenient for more light curtain combined methods；
2, current double camera Convergence method, since velocity of shot is fast (often greater than 1000m/s), double high speed cameras are at high cost and existing
There are cigarette, dirt interference, and image definition to be caused to decline for field test environment, measuring accuracy is influenced, (especially in running fire experiment, penetration
When experiment, the problem is particularly evident).In addition, double camera Convergence method needs, two viewing field of camera are coplanar, parameter is consistent, otherwise, will produce
Raw extra error；
3, existing one camera active light source retroreflector technical testing point of impact coordinate method, structure is simple, at low cost, but
It is that precision crosses high and can not equally inhibit cigarette, dirt interference problem not as good as double camera.
Summary of the invention
Object of the present invention is to propose a kind of colored one camera polarization imaging method point of impact coordinate test method, it is applied to conventional
Weapon point of impact coordinate measurement.
The present invention is achieved by the following technical scheme:
A kind of colour one camera polarization imaging method point of impact coordinate test method, includes the following steps:
Step 1: constituting point of impact test macro
Plane mirror I and plane mirror II, pulsed red light source and pulsed blue light source, Walla are arranged symmetrically positioned at target area two sides
This prism I and Wollaston prism II；The side to light of the Wollaston prism I is provided with 1/2 wave plate I, 1/2 wave plate
I fast axle with 0 ° of incident light angle；The side to light of the Wollaston prism II is provided with 1/2 wave plate II, 1/2 wave plate II
Fast axle with 22.5 ° of incident light angle；Positioned at the emergent light intersection of Wollaston prism I and Wollaston prism II arrangement point
Light prism, the feux rouges plane of incidence of the Amici prism is equipped with feux rouges narrow band filter slice, its blue light plane of incidence is filtered equipped with blue light narrowband
Wave plate；The outgoing light direction of the Amici prism is disposed with colored industrial camera.
Target area is located in the effective coverage being made of pulsed red light source and pulsed blue light source, and target is anti-in effective coverage
It penetrates light to turn back to form the independent optical paths that two-way forms an angle mutually by plane mirror I and the generation of plane mirror II optical path, optical path I is first
It first projects on 1/2 wave plate I, which is 0 °, and it is inclined along image planes to be divided into two bunch by wollaston prism I
Shake light, and a branch of angle of polarization is 0 °, a branch of angle of polarization is 90 °, is incident on Amici prism using feux rouges narrow band filter；Similarly；
Optical path II is projected first on 1/2 wave plate II, which is 22.5 °, by wollaston prism II along picture
Face is divided into two bunch polarised lights, and a branch of angle of polarization is 45 °, a branch of angle of polarization is 135 °, incident using blue light narrow band filter
To Amici prism；Four beam polarised lights converge at through Amici prism reflection and image in color camera.
In imaging process, pulsed red light source and pulsed blue light source and camera adjust light by outer touching source timing synchronization
At symmetrical red image, 45 ° and 135 ° of polarised light is schemed at symmetrical blue for 0 ° of road satisfaction and 90 ° of polarised lights
Picture.
Step 2: red, blue images are imaged in image ccd sensor by colored industrial camera, according to color filter type and
Interpolation algorithm is finally inversed by red image and blue image, specific as follows:
If the transmission direction of reflected light is the direction z, light wave electric field only has the component in the direction x, y, respectively E at this timexAnd Ey；
Then the Stokes of light wave fields is appropriate are as follows:
Wherein, I indicates radiation luminous intensity, and Q indicates the linearly polarized light intensity in horizontal direction, and U indicates the line on 45 ° of directions
Intensity of polarization light, V indicate circularly polarized light component, δ ExAnd EyBetween phase difference；
Dividing red, blue images can be obtained four width polarization images, and parsing obtains three components I, Q, U of Stokes,
Middle I component image is synthesis intensity image, and the different reflectivity for indicating target of I are different, and Q component image and U component image are
The intensity of linearly polarized light on target different directions, reflection is object edge information, at this time:
Q=I (0 °)-I (90 °)
U=I (45 °)-I (135 °)
The degree of polarization P and angle of polarization A of image are acquired according to above formula result:
What linear polarization degree P image and angle of polarization A image reflected is roughness, the texture information of target surface, according to bullet
With polarization of background information gap, the extraction of bullet edge is completed, i.e., according to color filter type and interpolation algorithm, from blending image
In be finally inversed by red image and blue image.
Step 3: picture point is respectively apart from optical center A for the same target point in red image and blue image1, A2
A pixel unit, l indicate the pixel spacing of CCD camera, and L indicates the distance between two CCD optical axises, α indicate CCD camera optical axis with
The angle of X-axis, f is the focal length of camera, according to the geometrical relationship between above-mentioned physical quantity, thus obtain point of impact coordinate (x ',
Y '):
The present invention is for solving the problems, such as following two:
Solve the problems, such as one: cigarette, dirt and the background stray light that the test of point of impact coordinate usually occurs in field experiment are done
It disturbs, and current imaging technique can not inhibit the generations such as cigarette, dirt, haze absorption and scattering effect, lead to brightness, the comparison of image
Degree and saturation degree the problem of declining, influencing measuring accuracy, the present invention propose polarization imaging method, at the same obtain 0 °, 45 °, 90 ° and
135 ° of polarization image improves measuring accuracy to obtain degree of polarization and angle of polarization image to inhibit to interfere.
Solve the problems, such as two: the double camera technical maturity that crosses is high compared with one camera retroreflector technology, but double camera technology
High-tech cost is brought, coplanar technology, binocular calibration technology are relatively cumbersome between camera.The present invention proposes the light splitting of single color camera
Method, active background illumination light splitting obtain red, blue dichromatism blending image, and monochrome image is finally inversed by after resolving, and monochromatic pulses are actively shone
Bright technology can shorten the time for exposure, promote camera ability, improve camera amplitude-frequency and target velocity mismatches, appearance is obscured and dragged
Tail phenomenon not only with the measuring accuracy of double camera Convergence method, and has taken into account testing cost, has reduced debugging difficulty.
The present invention has rational design, has good practical application and promotional value.
Detailed description of the invention
Fig. 1 shows colored one camera polarization imaging method point of impact coordinate test system schematic diagrames.
Fig. 2 indicates red monochromatic image.
Fig. 3 indicates blue monochromatic images.
Fig. 4 indicates system sequence relational graph.
Fig. 5 a indicates that double CCD cross schematic illustration.
Fig. 5 b indicates that double CCD cross vertical target schematic diagram.
Fig. 6 indicates that list CCD retroreflector founds target schematic diagram.
In figure: 1- plane mirror I, 2- plane mirror II, 3-1/2 wave plate I (0 ° of fast axle and incident light angle), 4-1/2 wave plate II
(22.5 ° of fast axle and incident light angle), 5- Wollaston prism I, 6- Wollaston prism II, 7- feux rouges narrow band filter, 8-
Blue light narrow band filter, 9- Amici prism, 10- colour industrial camera, 11- pulsed red light source, 12- pulsed blue light source；21-
0 ° of polarization image, 22-90 is as polarization image；31-45 ° of polarization image, 32-135 ° of polarization image；41- camera timing, 42- feux rouges
Light-pulse generator timing, 43- blue light light-pulse generator timing.
Specific embodiment
Specific embodiments of the present invention are described in detail with reference to the accompanying drawing.
A kind of colour one camera polarization imaging method point of impact coordinate test method, includes the following steps:
Step 1: constituting point of impact test macro
System principle is arranged symmetrically plane mirror I 1 and plane mirror II 2, pulsed red light as shown in Figure 1, being located at target area two sides
Source 11 and pulsed blue light source 12, Wollaston prism I 5 and Wollaston prism II 6；The side to light of Wollaston prism I 5 is set
It is equipped with the fast axle of 1/2 wave plate, I 3,1/2 wave plate I 3 and 0 ° of incident light angle；The side to light of Wollaston prism II 6 is provided with 1/2
The fast axle of II 4,1/2 wave plate II 4 of wave plate with 22.5 ° of incident light angle；Positioned at Wollaston prism I 5 and Wollaston prism II 6
Emergent light intersection arrange Amici prism 9, the feux rouges plane of incidence of Amici prism 9 is equipped with feux rouges narrow band filter slice 7, its blue light enters
Face is penetrated equipped with blue light narrow band filter slice 8；The outgoing light direction of Amici prism 9 is disposed with colored industrial camera 10.
Target area is located to be crossed in the effective coverage constituted by pulsed red light source 11 and pulsed blue light source 12, in effective district
In domain target reflecting light by mirror plane mirror I 1 and plane mirror II 2 occur optical path turn back to be formed two-way form an angle mutually it is only
Vertical optical path, optical path I are projected first on 1/2 wave plate I 3, which is 0 °, by Wollaston
(Wollaston) prism I 5 is divided into two bunch polarised lights along image planes, and a branch of angle of polarization is 0 °, a branch of angle of polarization is 90 °, then passes through
It crosses feux rouges narrow band filter 7 and is incident on Amici prism 9；Similarly；Optical path II is projected first on 1/2 wave plate II 4, the wave plate fast axle
Azimuth is 22.5 °, is divided into two bunch polarised lights, a branch of polarization along image planes by Wollaston (Wollaston) prism II 6
Angle is 45 °, a branch of angle of polarization is 135 °, is incident on Amici prism 9 using blue light narrow band filter 8；Four beam polarised lights are through dividing
The reflection of light prism 9, which converges at, images in color camera 10.
In imaging process, pulsed red light source and pulsed blue light source and camera adjust light by outer touching source timing synchronization
0 ° of road satisfaction and 90 ° of polarised lights are at symmetrical red image (as shown in Figure 2), and 45 ° and 135 ° of polarised light is at left and right pair
The blue image (as shown in Figure 3) of title.
Step 2: red, blue images are imaged in image ccd sensor by colored industrial camera, and original .Raw image is deposited
It is stored in computer.According to color filter type and interpolation algorithm, it is finally inversed by red image and blue image.Pulsed light source arteries and veins
Width is less than time for exposure, and red, blue-light source stringent synchronization, and when light-source brightness is higher, CCD completes electricity in light source pulse width time
Lotus accumulation, so that the trailing phenomenon as caused by the mismatch of image taking speed and target velocity is reduced, sequential relationship such as Fig. 4 institute
Show.
If the transmission direction of reflected light is the direction z, light wave electric field only has the component in the direction x, y, respectively E at this timexAnd Ey。
Then the Stokes of light wave fields can be described as in right amount:
Wherein, I indicates radiation luminous intensity, and Q indicates the linearly polarized light intensity in horizontal direction, and U indicates the line on 45 ° of directions
Intensity of polarization light, V indicate circularly polarized light component, generally take V=0, δ ExAnd EyBetween phase difference.
Dividing red, blue images can be obtained four width polarization images, and parsing obtains three components I, Q, U of Stokes,
Middle I component image is synthesis intensity image, and the different reflectivity for indicating target of I are different, and Q component image and U component image are
The intensity of linearly polarized light on target different directions, reflection is object edge information, and contrast is poor with visual effect, this
When:
Q=I (0 °)-I (90 °)
U=I (45 °)-I (135 °)
It can be in the hope of the degree of polarization P and angle of polarization A of image according to above formula result:
What linear polarization degree P image and angle of polarization A image reflected is the information such as roughness, the texture of target surface, according to bullet
Ball and polarization of background information gap, complete the extraction of bullet edge, to remove background interference.
Object reflected light, then will be different after polarization manipulation by two sides mirror plane mirror in validity test region
The convergence of color reflective light images in color camera, according to color filter type and interpolation algorithm, is finally inversed by from blending image red
Chromatic graph picture and blue image are equivalent to and red reflex light and blue reflected light are imaged respectively using two CCD cameras, as a result and double
CCD intersection measuring principle is identical.
Step 3: picture point is respectively apart from optical center A for the same target point in red image and blue image1, A2
A pixel unit, l indicate the pixel spacing of CCD camera, and L indicates the distance between two CCD optical axises, α indicate CCD camera optical axis with
The angle of X-axis, f is the focal length of camera, according to the geometrical relationship between above-mentioned physical quantity, thus obtain point of impact coordinate (x ',
Y '):
It should be pointed out that for the those skilled in the art of the art, without departing from the principle of the present invention,
Several improvement and application can also be made, these are improved and application is also considered as protection scope of the present invention.
Claims (2)
1. a kind of colour one camera polarization imaging method point of impact coordinate test method, characterized by the following steps:
Step 1: constituting point of impact test macro
Plane mirror I (1) and plane mirror II (2), pulsed red light source (11) and pulsed blue light are arranged symmetrically positioned at target area two sides
Source (12), Wollaston prism I (5) and Wollaston prism II (6)；The side to light of the Wollaston prism I (5) is provided with
1/2 wave plate I (3), the fast axle of 1/2 wave plate I (3) with 0 ° of incident light angle；The side to light of the Wollaston prism II (6)
Be provided with 1/2 wave plate II (4), the fast axle of 1/2 wave plate II (4) with 22.5 ° of incident light angle；Positioned at Wollaston prism I
(5) and the emergent light intersection of Wollaston prism II (6) arrangement Amici prism (9), the feux rouges of the Amici prism (9) are incident
Face is equipped with feux rouges narrow band filter slice (7), its blue light plane of incidence is equipped with blue light narrow band filter slice (8)；The Amici prism (9) goes out
Penetrate light direction arrangement chromatic colour industrial camera (10)；
Target area is located in the effective coverage being made of pulsed red light source (11) and pulsed blue light source (12), mesh in effective coverage
Mark reflected light occurs optical path by plane mirror I (1) and plane mirror II (2) and turns back to form the independent light that two-way forms an angle mutually
Road, optical path I are projected first on 1/2 wave plate I (3), the wave plate phase retardation be 0 °, by wollaston prism I (5) along
Image planes are divided into two bunch polarised lights, and a branch of angle of polarization is 0 °, a branch of angle of polarization is 90 °, enter using feux rouges narrow band filter (7)
It is mapped to Amici prism (9)；Similarly；Optical path II is projected first on 1/2 wave plate II (4), which is 22.5 °,
It is divided into two bunch polarised lights along image planes by wollaston prism II (6), a branch of angle of polarization is 45 °, a branch of angle of polarization is
135 °, Amici prism (9) are incident on using blue light narrow band filter (8)；Four beam polarised lights are reflected through Amici prism (9) to be assembled
In imaging in color camera (10)；
In imaging process, it is full to adjust optical path by outer touching source timing synchronization for pulsed red light source and pulsed blue light source and camera
0 ° of foot and 90 ° of polarised lights are at symmetrical red image, and 45 ° and 135 ° of polarised light is at symmetrical blue image；
Step 2: red, blue images are imaged in image ccd sensor by colored industrial camera, according to color filter type and interpolation
Algorithm is finally inversed by red image and blue image, specific as follows:
If the transmission direction of reflected light is the direction z, light wave electric field only has the component in the direction x, y, respectively E at this timexAnd Ey；Then light
The Stokes of wave field is appropriate are as follows:
Wherein, I indicates radiation luminous intensity, and Q indicates the linearly polarized light intensity in horizontal direction, and U indicates the linear polarization on 45 ° of directions
Luminous intensity, V indicate circularly polarized light component, δ ExAnd EyBetween phase difference；
Dividing red, blue images can be obtained four width polarization images, and parsing obtains three components I, Q, U of Stokes, and wherein I points
Spirogram seems synthesis intensity image, and the different reflectivity for indicating targets of I are different, Q component image and U component image be target not
The intensity of linearly polarized light on equidirectional, reflection is object edge information, at this time:
Q=I (0 °)-I (90 °)
U=I (45 °)-I (135 °)
The degree of polarization P and angle of polarization A of image are acquired according to above formula result:
What linear polarization degree P image and angle of polarization A image reflected is roughness, the texture information of target surface, according to bullet and back
Scape polarization information difference, completes the extraction of bullet edge, i.e., anti-from blending image according to color filter type and interpolation algorithm
Perform red image and blue image；
Step 3: picture point is respectively apart from optical center A for the same target point in red image and blue image1, A2A picture
Plain unit, l indicate the pixel spacing of CCD camera, and L indicates that the distance between two CCD optical axises, α indicate CCD camera optical axis and X-axis
Angle, f is the focal length of camera, according to the geometrical relationship between above-mentioned physical quantity, to obtain point of impact coordinate (x ', y '):
2. a kind of colour one camera polarization imaging method point of impact coordinate test system, it is characterised in that: it is symmetrical to be located at target area two sides
Plane of arrangement mirror I (1) and plane mirror II (2), pulsed red light source (11) and pulsed blue light source (12), Wollaston prism I
(5) and Wollaston prism II (6)；The side to light of the Wollaston prism I (5) is provided with 1/2 wave plate I (3), and described 1/2
The fast axle of wave plate I (3) with 0 ° of incident light angle；The side to light of the Wollaston prism II (6) is provided with 1/2 wave plate II (4),
The fast axle of 1/2 wave plate II (4) with 22.5 ° of incident light angle；Positioned at Wollaston prism I (5) and Wollaston prism II
(6) emergent light intersection arranges Amici prism (9), and the feux rouges plane of incidence of the Amici prism (9) is equipped with feux rouges narrow-band filtering
Piece (7), its blue light plane of incidence are equipped with blue light narrow band filter slice (8)；The outgoing light direction of the Amici prism (9) is disposed with colour
Industrial camera (10)；
Target area is located in the effective coverage being made of pulsed red light source (11) and pulsed blue light source (12), mesh in effective coverage
Mark reflected light occurs optical path by plane mirror I (1) and plane mirror II (2) and turns back to form the independent light that two-way forms an angle mutually
Road, optical path I are projected first on 1/2 wave plate I (3), the wave plate phase retardation be 0 °, by wollaston prism I (5) along
Image planes are divided into two bunch polarised lights, and a branch of angle of polarization is 0 °, a branch of angle of polarization is 90 °, enter using feux rouges narrow band filter (7)
It is mapped to Amici prism (9)；Similarly；Optical path II is projected first on 1/2 wave plate II (4), which is 22.5 °,
It is divided into two bunch polarised lights along image planes by wollaston prism II (6), a branch of angle of polarization is 45 °, a branch of angle of polarization is
135 °, Amici prism (9) are incident on using blue light narrow band filter (8)；
Four beam polarised lights converge at through Amici prism (9) reflection and image in color camera (10).
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Cited By (3)
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