CN109120920A - A kind of correction system of the polarization camera based on pixel delineation - Google Patents
A kind of correction system of the polarization camera based on pixel delineation Download PDFInfo
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- CN109120920A CN109120920A CN201811058236.5A CN201811058236A CN109120920A CN 109120920 A CN109120920 A CN 109120920A CN 201811058236 A CN201811058236 A CN 201811058236A CN 109120920 A CN109120920 A CN 109120920A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/80—Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
Abstract
The invention discloses a kind of correction systems of polarization camera based on pixel delineation.The correction system includes: polarization camera Calibration system and polarization camera calibration system.After instrument matrix calibration mathematical model of the polarization camera Calibration system by the polarization camera for establishing pixel delineation, is calibrated using least square method test, obtain scaling parameter；The polarization camera calibration system is according to the resulting scaling parameter of the polarization camera Calibration system and passes through the real-time output calibration image of correcting algorithm.Correction system disclosed by the invention has the advantages that the output precision of images is higher.
Description
Technical field
The present invention relates to technical field of photoelectric detection, in particular to the correction system of a kind of polarization camera based on pixel delineation
System.
Background technique
The core devices of polarization camera polarize the every of camera by the light splitting effect of the grating for metallic aluminium nanometer grating
The pixel group of a 2*2 can measure three linear polarization components of light vector, that is, S0 component, S1 component and S2 component.
The period of micro-nano wire grating is only 140nm or so, therefore causes light transmission shaft transmitance and uniformity is generally omited
Inferior and conventional polarizers.The too small diffraction effect for also resulting in light and passing through nanometer grating of screen periods simultaneously, when micro-nano grating
With detector there are when certain distance, directional light will become the diverging light of certain angle due to diffraction effect to cause adjacent picture
The crosstalk effect of member is to greatly reduce the extinction ratio of linear polarization camera.The inhomogeneities of the reduction of extinction ratio and transmitance with subtract
Small characteristic will be greatly reduced the precision of polarimetry.Therefore, the correction system for being directed to the linear polarization camera of pixel delineation is outstanding
It is important.
Summary of the invention
The present invention is directed to overcome defect of the existing technology, the invention adopts the following technical scheme:
It is described to be carved based on pixel the embodiment of the invention provides a kind of correction system of polarization camera based on pixel delineation
The correction system of polarization camera drawn includes:
Polarize camera Calibration system, the instrument for polarizing camera that the polarization camera Calibration system is delineated by establishing pixel
After matrix calibrates mathematical model, is calibrated using least square method test, obtain scaling parameter；
Camera calibration system is polarized, the polarization camera calibration system is resulting fixed according to the polarization camera Calibration system
It marks parameter and passes through the real-time output calibration image of correcting algorithm.
In some embodiments, the polarization camera Calibration system includes:
Calibrate optical path and hardware device and calibration control device；
The calibration optical path and hardware device include: calibration optical path, polarizing film Rotation Controllers and host computer；
The calibration control device connects the polarizing film Rotation Controllers and host computer；
The calibration optical path includes: light source, polarizing film, long thin parallel light pipe and polarization camera；The light of the light source passes through
Polarizing film with the polarizing film Rotation Controllers becomes the controllable linearly polarized light of light vector parameter, then by described elongated
Become directional light after parallel light tube and is incident in the polarization camera；
The host computer is connected to the polarization camera calibration system.
The calibration control device controls the polarizing film Rotation Controllers and the polarization camera, completes the polarization phase
The pre- calibration of machine and accurate calibration, then obtain scaling parameter.
In some embodiments, the calibration optical path further include: diaphragm and cylinder,
The light of the light source first passes around the diaphragm and becomes to be similar to after point light source by cylinder limitation light hair
Angle is dissipated, the ranges of incidence angles of polarizing film is met.
In some embodiments, the light source is integrating sphere.
In some embodiments, the instrument matrix calibration mathematical model is ideal instrument matrix calibration mathematical model.
In some embodiments, digital gain of the polarization camera in calibration process is 0 and the time for exposure is constant, together
Shi Suoshu polarizes the response of camera within linear zone.
In some embodiments, the calibration control device controls the angle of the polarizing film rotation with scheduled angular accuracy
Degree controls the picture of the polarization predetermined number of camera continuous sampling for fixed after the polarizing film is rotated to predetermined position
Mark, and instrument calibration matrix is calculated according to scaling algorithm.
In some embodiments, the calibration control device includes:
Camera parameter adjustment and display module, camera image acquisition module, computing module；
The camera image acquisition module, for carrying out Image Acquisition；
The camera parameter adjustment and display module set the exposure value of the polarization camera according to initial beam intensity, then
The polarizing film is controlled by the polarizing film Rotation Controllers and rotates to set angle, to the camera image acquisition module
The image of acquisition carries out the analysis of the gray value of image, when the gray value of described image exceeds the dynamic range of camera, carries out
Alarm, and adjust the exposure value of the polarization camera and restart the pre- calibration process of a new round until not having in whole flow process
There is the case where gray value exceeds linear zone；
The computing module obtains calibration ginseng for calculating the image of the acquisition during accurate calibration
Number.
In some embodiments, the polarization camera calibration system includes: main control chip, storage chip, receive chip and
Transmitting chip；
The main control chip is used for according to the resulting scaling parameter of the polarization camera Calibration system and passes through correcting algorithm
It is calculated；
The storage chip is for storing correction coefficient；
The reception chip, for receiving scaling parameter；
The transmitting chip is used for output calibration image.
In some embodiments, the main control chip is FPGA, and the storage chip is SRAM, and the reception chip is
Cameralink physical layer receives chip, and the transmitting chip is cameralink physical layer transmitting chip.
Technical effect of the invention: the correction system of the polarization camera disclosed by the invention based on pixel delineation, from polarization
Optical transmission principles are started with, first by establish pixel delineation polarization camera instrument matrix calibrate mathematical model after, using most
Small square law test is calibrated, and is obtained scaling parameter, is provided the scaling parameter of each pixel group, can correct pixel group simultaneously
The heterogeneity of S0, S1 and S2 component；Meanwhile the present invention, equipped with polarization camera calibration system, scaling parameter is input to polarization phase
After machine correction system, the image of camera is polarized into crossing after the system compensation of polarization camera calibration the i.e. higher polarization figure of output accuracy
Picture.
Detailed description of the invention
Fig. 1 is the schematic illustration of polarization camera Calibration system according to an embodiment of the invention；
Fig. 2 is the polarization camera Calibration system hardware schematic diagram according to one embodiment of the invention；
Fig. 3 is polarization camera Calibration system and device schematic diagram；
Fig. 4 is polarization camera calibration system hardware composition block diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and specific implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain this hair
It is bright, but not to limit the present invention.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Term explains part:
FPGA:Field-Programmable Gate Array, field programmable gate array；
SRAM:Static Random-Access Memory, static random access memory；
Pixel delineation polarization camera has the characteristics that small in size, low in energy consumption, environmental reliability is high, is widely used in remote sensing
Polarization imaging field.The core devices of pixel delineation polarization camera are micro-nano wire grating, polarization characteristic and traditional polarization
Piece has larger difference.Therefore need to carry out the fine adjustment of camera polarization characteristic using polarization camera calibration system.
Referring to figs. 1 to shown in Fig. 4, the present invention provides a kind of correction systems of polarization camera based on pixel delineation.
The correction system of the polarization camera based on pixel delineation includes: polarization camera Calibration system 110 and polarization phase
Machine corrects system.
The polarization camera Calibration system 110 calibrates mathematics by establishing the instrument matrix of the polarization camera 6 of pixel delineation
After model, is calibrated using least square method test, obtain scaling parameter；
The polarization camera calibration system is according to the resulting scaling parameter of the polarization camera Calibration system 110 and passes through school
The real-time output calibration image of normal operation method.
In some embodiments, the polarization camera Calibration system 110 includes:
Calibrate optical path and hardware device 1110 and calibration control device 1120；
The calibration optical path and hardware device 1110 include: calibration optical path 1111, polarizing film Rotation Controllers 1112 and on
Position machine 1113；
The calibration control device 1120 connects the polarizing film Rotation Controllers 1112 and host computer 1113；
The calibration optical path 1111 includes: light source 1, polarizing film 4, long thin parallel light pipe 5 and polarization camera 6；The light source 1
Light pass through and become the controllable linearly polarized light of light vector parameter with the polarizing film 4 of the polarizing film Rotation Controllers 1112, and
Become directional light after the long thin parallel light pipe 5 afterwards and is incident in the polarization camera 6；
The host computer 1113 is connected to the polarization camera calibration system.The host computer 1113 is used for synchronously control institute
State polarization camera and the polarizing film Rotation Controllers 1112.
The calibration control device 1120 controls the polarizing film Rotation Controllers 1112 and the polarization camera 6, completes
The pre- calibration and accurate calibration of the polarization camera 6, then obtain scaling parameter.
In some embodiments, the calibration optical path 1111 further include: diaphragm 2 and cylinder 3, the light of the light source 1 is first
Divergence of beam angle is limited by the cylinder 3 after the diaphragm 2 becomes to be similar to point light source 1, meets the incidence of polarizing film 4
Angular region.
In some embodiments, the light source 1 is integrating sphere.
In some embodiments, the instrument matrix calibration mathematical model is ideal instrument matrix calibration mathematical model.
In some embodiments, digital gain of the polarization camera 6 in calibration process is 0 and the time for exposure is constant,
The response of the polarization camera 6 is within linear zone simultaneously.
In some embodiments, the calibration control device 1120 controls the polarizing film 4 with scheduled angular accuracy and revolves
The angle turned controls the figure of the polarization predetermined number of 6 continuous sampling of camera behind the polarizing film 4 rotation to predetermined position
Piece calculates instrument calibration matrix according to scaling algorithm for calibrating.
In some embodiments, the calibration control device 1120 includes:
Camera parameter adjustment and display module 1122, camera image acquisition module 1121, computing module 1123；
The camera image acquisition module 1121, for carrying out Image Acquisition；
The camera parameter adjustment and display module 1122 set the exposure value of the polarization camera 6 according to initial beam intensity,
The polarizing film 4 is then controlled by the polarizing film Rotation Controllers 1112 and rotates to set angle, to the camera figure
The image acquired as acquisition module 1121 carries out the analysis of the gray value of image, when the gray value of described image is beyond the dynamic of camera
When state range, alarm, and adjust it is described polarization camera 6 exposure value and restart a new round pre- calibration process until
Do not occur the case where gray value is beyond linear zone in whole flow process；
The computing module 1123, for calculating the image of the acquisition, being determined during accurate calibration
Mark parameter.
In some embodiments, the polarization camera calibration system includes: main control chip, storage chip, receive chip and
Transmitting chip；
The main control chip is used to be calculated according to the resulting scaling parameter of the polarization camera Calibration system 110 with by correction
Method is calculated；
The storage chip is for storing correction coefficient；
The reception chip, for receiving scaling parameter；
The transmitting chip is used for output calibration image.
In some embodiments, the main control chip is FPGA, and the storage chip is SRAM, and the reception chip is
Cameralink physical layer receives chip, and the transmitting chip is cameralink physical layer transmitting chip.
Below with reference to specific embodiment to it is provided by the invention based on pixel delineation polarization camera correction system into
Row detailed description.
Embodiment 1:
Referring to figs. 1 to the specific of the correction system for shown in Fig. 4, being the polarization camera provided by the invention based on pixel delineation
Embodiment.
In an embodiment of the invention, the calibration optical path 1111 includes: light source 1, polarizing film 4, long thin parallel light pipe 5
And polarization camera 6；The light of the light source 1 passes through the polarizing film 4 with the polarizing film Rotation Controllers 1112 and becomes light vector
The controllable linearly polarized light of parameter then becomes directional light after the long thin parallel light pipe 5 and is incident in the polarization camera 6.
As shown in Fig. 2, entire calibration process carries out in darkroom.The light source is integrating sphere.The light of integrating sphere first passes around the change of diaphragm 2
Divergence of beam angle is limited at the cylinder 3 being similar to after point light source 1 by delustring, meets the ranges of incidence angles of polarizing film 4.Light warp
It crosses with precision rotation control system, that is, the polarizing film Rotation Controllers 1112, so that polarizing film 4 becomes light vector parameter
Controllable linearly polarized light.Then become directional light after system parallel light tube and is incident in polarization camera 6.
Wherein, the light intensity before polarizing film 4 need to be measured using radiometer.
Calibrating control device 1120 includes camera image acquisition module 1121, polarizing film Rotation Controllers 1112 and calculating mould
Block 1123, as shown in Figure 3.Wherein mainly setting polarizes camera in calibration process for camera parameter adjustment and display module 1122
Parameter and monitoring calibration data.Polarization camera 6 needs to guarantee that digital gain is 0 and the time for exposure is constant in calibration process, simultaneously
The response of camera must also be met within linear zone.
The operating mode of calibration control device 1120 is divided into three kinds, specifically includes: under pre- calibration, accurate calibration and parameter
It carries.In advance be targeted at calibration optical path 1111 build after, by camera parameter adjustment and display module 1122 first according to initial beam intensity
Camera exposure value is set, polarizing film 4 is then controlled by polarizing film Rotation Controllers 1112 and is rotated, every time 45 ° of rotation.It rotates to
It after set angle, is acquired by camera image acquisition module 1121, by camera parameter adjustment and display module after acquisition
1122 are responsible for the gray value of analysis image, after gray value exceeds the dynamic range of camera, camera parameter adjustment and display module
1122 will alarm, and then adjust camera exposure value and restart the pre- calibration process of a new round until without going out in whole flow process
The case where existing gray value exceeds linear zone.
During accurate calibration, by 1112 rotatory polarization piece 4 of polarizing film Rotation Controllers, 1 degree a total of 360 is rotated every time
Group experiment condition, after rotating to set angle, is acquired, each continuous acquisition 100 by camera image acquisition module 1121
Picture.Calibration control device 1120 is transferred to calibration matrix calculating process later, and the principle process of calculating is as follows:
Wherein, light source 1 is integrating sphere, and output face inhomogeneities is 1% below uniformly to divide polarized light source 1.Its output light
Stokes vector it is as shown in Equation 1, wherein S0ingFor the light intensity before polarizing film 4.
Since polarization camera 6 is only capable of measuring linear polarization amount, scaling unit is the polarizing film 4 that can accurately rotate.Its line
It is as shown in Equation 2 to polarize Muller matrix M.
Wherein, ε is the transmitance of 4 light transmission shaft of polarizing film, and η is the transmitance of light blocking axis, due to testing selected polarization
4 transmitance of piece is greater than 95%, and extinction ratio is greater than 5000:1, therefore can ignore above-mentioned two, and simplification of a formula is as shown in Equation 3.
SDIt is light source 1 by the Stokes vector of the emergent light of scaling unit, as shown in Equation 4.
SD=M*S (4)
The nanometer grating is one group per adjacent 4 pixels, the nanometer polarizing film 4 of different angle is delineated respectively, due to inclined
Vibration camera 6 is image camera, change of the main measurement with polarization state in piece image.Therefore, each for the same camera
4 delineation angles in pixel group are fixed, though not needing the strict difinition angle occurrence is how many, the selection of value
Also it will affect the precision of detection.Since the ccd detector after nanometer grating only measures the light intensity item in Stokes light vector, because
This obtains the instrument matrix M of every component parser according to formula 3PIt can be written as form as shown in Equation 5.
Wherein,For the light transmission shaft transmitance of first pixel of upper right,For the transmission of first pixel light blocking axis of upper right
Rate, θ ruFor the angle of micro- polarizing film 4 of first pixel of upper right, other symbol meanings can and so on.The instrument matrix and fixed
Matrix S composed by the light intensity that every group of detector receives during markcWith scaling unit emergent light SDRelationship it is as shown in Equation 6.
Wherein, IruFor the light intensity in every pixel group upper right corner, IluFor the light intensity in every pixel group upper right corner, other symbols are successively
Analogize, pinv indicates pseudoinverse.Wherein scaling unit emergent light SCFor known quantity, detector light intensity group matrix S can be surveyedCIt also is known
Amount, the instrument matrix of each pixel group of polarization analysis device can be found out with formula 6.But during actual tests, optical device is considered
The reasons such as rigging error, the undesirable property of camera nonlinearity, polarizing film 4,4 angle of polarizing film and product in scaling unit
Bulb separation light intensity is non-ideal value, and there is also certain non-linear for the light intensity of detector.So available by repeatedly measurement
Most approach the instrument matrix of the polarization analysis device of ideal value.
Using most basic linear multiple measurement approximatioss, the principle of Matrix least square method, matrix equation
When wherein making noise v minimumValue should be as shown in Equation 7
Corresponding above-mentioned linear least square, instrument M hereinpIt can regard the unknown number in original equation asL is corresponding
In the light intensity matrix S of the detector pixel group of n times experimentcaex, coefficient matrix B corresponds to the scaling unit output that n times test
The Stokes vector matrix S of lightDex, then formula 8 is obtained according to Matrix least square method is theoretical, as follows.
MP=Scaex*(SDex)T*pinv(SDex*(SDex)T) (8)
After completing parameter calculating, control device is transferred to parameter downloading process, will calculate resulting parameter matrix by serial ports
Under be loaded in polarization camera calibration system in.
The main control chip for polarizing camera calibration system is FPGA, and wherein SDRAM is used for the obtained school of store calibration system
Positive coefficient, hardware composition block diagram are as shown in Figure 4.There are two types of operating modes for box, when downloading operating mode, by host computer 1113
Resulting Pixel-level correction matrix will be calculated, SDRAM is written by the control of FPGA via serial ports.Real time correction mode, FPGA connect
Receive the image data that cameralink physical chip decodes.It is carried out in real time with the correction data in SDRAM according to algorithm
Matrix multiple operation, pattern of rows and columns that resulting data are proposed according to algorithm are transmitted by physical layer transmitting chip.Partially
The algorithm principle for camera calibration system of shaking is as follows:
The target light for being incident on polarization camera 6 is Sin, it is M by instrument matrixpPolarization camera 6 in the big picture dot of detector
Formed light intensity ScaJust like 9 relationship of formula.
It is directed to incident optical arrays Sin, can find out respectively intensity image S0, the degree of polarization image DOLP of optical arrays with
Polarize phase angle image AOLP.Calculation formula is as shown in Equation 10.
Wherein, θ is the microarray angle before pixel.By formula 10 it is found that carrying out the calibration of instrument matrix for each microimage member
Afterwards, light transmission shaft transmitance q, the angle of light blocking axis transmitance p and each 4 array of micro- polarizing film can be found out by instrument matrix
Degree, then finds out optical arrays SinStokes vector.But since there are trigonometric functions in practical calculating, so that computation complexity
It is higher.
Therefore the present invention proposes ideal instrument matrix Wideal, it is assumed that 4 array of micro- polarizing film before detector polarizes and divides
Parser is ideal diagonal 4 array of polarizing film in 90 °, and angular distribution is started with 0 °, 45 °.Its expression formula is as shown in Equation 11.
Wherein, Sideal_anIndicate optical arrays SinThe azimuthal light intensity of different polarization after desired polarization analyzer, obtains
Desired light powerful formation column S outideal_anFurther according to WidealDistribution can find out optical arrays SinCorrected degree of polarization image with
Polarize phase angle image.
It is based on polarizing camera made of conventional polarizers in the prior art, only with one group of correction system on the target surface of entire camera
Number is corrected, and does not consider the heterogeneity of micro-nano wire grating.And it considers heteropical correction system and only uses uniformly
Integrating sphere direct irradiation polarization camera be corrected, the correcting mode is only to correcting micro-nano wiregrating relative to S0 component not
Uniformity, correction is not two remaining.
The present invention starts with from polarization optical transmission principles, has initially set up the polarization camera instrument matrix scalar number of pixel delineation
Model is learned, is then calibrated using least square method test, is provided the scaling parameter of each pixel group, pixel can be corrected simultaneously
The heterogeneity of group S0, S1 and S2 component.Meanwhile the present invention, equipped with polarization camera calibration system, scaling parameter is input to polarization
After camera calibration system, the image of camera is polarized into crossing after the system compensation of polarization camera calibration the i.e. higher polarization figure of output accuracy
Picture.
Those skilled in the art should further appreciate that, describe in conjunction with the embodiments described herein
Each exemplary unit and algorithm steps, can be realized with the combination of electronic hardware, computer installation or the two, in order to clear
Illustrate to Chu the interchangeability of hardware and device, generally describes each exemplary group according to function in the above description
At and step.These functions are executed in a manner of hardware or device actually, specific application and design depending on technical solution
Constraint condition.Professional technician can use different methods to achieve the described function each specific application, but
It is that such implementation should not be considered as beyond the scope of the present invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
The above described specific embodiments of the present invention are not intended to limit the scope of the present invention..Any basis
Any other various changes and modifications made by technical concept of the invention should be included in the guarantor of the claims in the present invention
It protects in range.
Claims (10)
1. it is a kind of based on pixel delineation polarization camera correction system characterized by comprising polarization camera Calibration system and
Polarize camera calibration system；
After instrument matrix calibration mathematical model of the polarization camera Calibration system by the polarization camera for establishing pixel delineation, adopt
It is calibrated with least square method test, obtains scaling parameter；
The polarization camera calibration system is according to the resulting scaling parameter of the polarization camera Calibration system and passes through correcting algorithm
Real-time output calibration image.
2. the correction system of the polarization camera according to claim 1 based on pixel delineation, which is characterized in that the polarization
Camera Calibration system includes: calibration optical path and hardware device and calibration control device；
The calibration optical path and hardware device include: calibration optical path, polarizing film Rotation Controllers and host computer；
The calibration control device connects the polarizing film Rotation Controllers and host computer；
The calibration optical path includes: light source, polarizing film, long thin parallel light pipe and polarization camera；The light of the light source is by having
The polarizing film of the polarizing film Rotation Controllers becomes the controllable linearly polarized light of light vector parameter, then passes through the long thin parallel
Become directional light after light pipe and is incident in the polarization camera；
The host computer is connected to the polarization camera calibration system；
The calibration control device controls the polarizing film Rotation Controllers and the polarization camera, completes the polarization camera
Pre- calibration and accurate calibration, then obtain scaling parameter.
3. the correction system of the polarization camera according to claim 2 based on pixel delineation, which is characterized in that the calibration
Optical path further include: diaphragm and cylinder, the light of the light source first pass around the diaphragm and becomes to be similar to after point light source by described
Cylinder limits divergence of beam angle, meets the ranges of incidence angles of polarizing film.
4. the correction system of the polarization camera according to claim 2 or 3 based on pixel delineation, which is characterized in that described
Light source is integrating sphere.
5. the correction system of the polarization camera according to claim 1 based on pixel delineation, which is characterized in that the instrument
Matrix calibration mathematical model is ideal instrument matrix calibration mathematical model.
6. the correction system of the polarization camera according to claim 2 based on pixel delineation, which is characterized in that the polarization
Digital gain of the camera in calibration process is 0 and the time for exposure is constant, while the response of the polarization camera is linear
Within area.
7. the correction system of the polarization camera according to claim 2 based on pixel delineation, which is characterized in that the calibration
Control device controls the angle of the polarizing film rotation with scheduled angular accuracy, when the polarizing film is rotated to predetermined position
Afterwards, the picture of the polarization predetermined number of camera continuous sampling is controlled for calibrating, and instrument is calculated according to scaling algorithm and is determined
Mark matrix.
8. the correction system of the polarization camera according to claim 2 based on pixel delineation, which is characterized in that the calibration
Control device includes: camera parameter adjustment and display module, camera image acquisition module, computing module；
The camera image acquisition module, for carrying out Image Acquisition；
The camera parameter adjustment and display module set the exposure value of the polarization camera according to initial beam intensity, then pass through
The polarizing film Rotation Controllers controls the polarizing film and rotates to set angle, acquires to the camera image acquisition module
Image carry out image gray value analysis, when the gray value of described image exceed camera dynamic range when, alarm,
And it adjusts the exposure value of the polarization camera and restarts the pre- calibration process of a new round until not occurring in whole flow process
Gray value exceeds the case where linear zone；
The computing module, for calculating the image of the acquisition, obtaining scaling parameter during accurate calibration.
9. the correction system of the polarization camera according to claim 2 based on pixel delineation, which is characterized in that the polarization
Camera calibration system includes: main control chip, and storage chip receives chip and transmitting chip；
The main control chip is used to be carried out according to the resulting scaling parameter of the polarization camera Calibration system with by correcting algorithm
It calculates；
The storage chip is for storing correction coefficient；
The reception chip, for receiving scaling parameter；
The transmitting chip is used for output calibration image.
10. the correction system of the polarization camera according to claim 9 based on pixel delineation, which is characterized in that the master
Control chip is FPGA, and the storage chip is SRAM, and the reception chip is that cameralink physical layer receives chip, the hair
Core shooting piece is cameralink physical layer transmitting chip.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112492300A (en) * | 2020-11-26 | 2021-03-12 | 长春理工大学 | Polarization spectrum camera detector and detection method |
| CN115031843A (en) * | 2022-08-10 | 2022-09-09 | 中国人民解放军海军工程大学 | Correction method based on polarization camera uniformity correction device |
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| CN112492300B (en) * | 2020-11-26 | 2023-07-25 | 长春理工大学 | Polarization spectrum camera detector and detection method |
| CN115031843A (en) * | 2022-08-10 | 2022-09-09 | 中国人民解放军海军工程大学 | Correction method based on polarization camera uniformity correction device |
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