CN109297910A - A kind of polarization angle error calibration method of timesharing imaging polarization image - Google Patents
A kind of polarization angle error calibration method of timesharing imaging polarization image Download PDFInfo
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Abstract
A kind of polarization angle error calibration method of timesharing imaging polarization image disclosed by the invention, belongs to image procossing and test and measuring technical field.The present invention measures the polarizing film angular error of timesharing polarized imaging system to be corrected；Then, the polarization angle information of polarization image is calculated and corrected according to Malus' law and stokes parameter；Finally, completion is corrected polarization degree information according to Malus' law, stokes parameter and the polarization angle information corrected.The present invention can eliminate polarizing film angular error adverse effect caused by the polarization information of polarization image, reduce the measurement of degree of polarization and angle of polarization image and calculate error, improve the polarization information accuracy of timesharing polarized systems.
Description
Technical field
The present invention relates to based on timesharing imaging polarization image the bearing calibration of polarizing film angular error more particularly to a kind of needle
Polarization information correction is carried out to rotatory polarization piece angular error.
Background technique
Compared with intensity imaging, polarization image increases the dimension of target surface polarization information (as polarized on its basis
Degree, the angle of polarization), polarization characteristic can express the information abundant such as target surface state, material, and can weaken complicated back
The influence of scape and environment to image, in target identification, remote sensing, the fields such as bionics navigation are received significant attention.
It is different according to polarized imaging system structure, it is broadly divided into timesharing imaging and while two classes is imaged.Timesharing imaging is inclined
Vibrating system carries out polarization imaging to same target by different moments, is suitable for static target；Imaging polarization system passes through simultaneously
Single exposure and obtain target different polarization angular image, static target and moving target are all applicable in.It is inclined due to being imaged simultaneously
Vibrating system cost is high, and timesharing imaging system relative moderate, mostly uses timesharing polarized imaging system in research at present.
The key of timesharing polarized imaging system acquisition polarization image be polarizing film different angle to target be imaged into
And obtain polarization image.Generally taken in timesharing imaging system at this stage motor driven polarizing film rotate so that acquire respectively 0 °,
45 °, 90 °, the polarization image under 135 ° of this 4 direction polarization angles.However, during taking this method to acquire image
Since motor initial position does not return 0, under the influence of motor running accuracy etc., 4 polarization angles collected certainly will have with ideal value
Certain error, this brings larger impact to the accuracy for calculating polarization information.
In conclusion it is very heavy to be corrected process to the polarization angle error of acquisition for timesharing imaging polarization system
It wants, it is essential.How polarization angle error is corrected, is one urgently to be resolved to increase polarization information accuracy
Problem.
Summary of the invention
The present invention provides a kind of polarization angle error calibration method of timesharing imaging polarization image, it is intended to solve inclined to timesharing
Vibration imaging system is corrected because of the problem of the polarization information inaccuracy caused by polarization angle error, and it is inclined effectively to correct timesharing
Imaging system of shaking and its polarization image of acquisition, improve the precision of polarized systems and the accuracy of polarization information
The polarization angle error calibration method of a kind of timesharing imaging polarization image disclosed by the invention, firstly, measurement polarization
0 ° of system, 45 °, 90 °, 135 ° this 4 directions and theoretical value angular error Δ0、Δ45、Δ90、Δ135；Then, according to angle
Angle of polarization Information application stokes parameter in error and polarization image is corrected the angle of polarization；Finally schemed according to polarization
As stokes parameter is corrected polarization image degree of polarization.
A kind of polarization angle error calibration method of timesharing imaging polarization image disclosed by the invention, specifically includes and walks
It is rapid:
Step 1, it measures to not correcting polarized systems polarizing film angular error.
Specific steps are as follows:
Step 1.1, before light source being placed in polarized systems to be corrected, guarantee that light source is full of entire visual field；Adjust light source light
Intensity makes polarized systems gray value lower than maximum value；
Step 1.2, the polarizing film of Accurate Calibration angle is added in light source and polarized systems, by the angle of polarization of polarized systems
Degree adjust separately the polarizing film of calibration rotate respectively to 0 °, 45 °, 90 °, 135 ° extremely with -90 ° of the angle of its delustring, -45 °,
0 °, 45 °, and its error is counted, the error for obtaining 0 °, 45 °, 90 °, 135 ° this 4 directions is respectively Δ0、Δ45、Δ90、
Δ135.For the influence for reducing random error, the measurement of angular error is at least 4 times, is then averaged.
Step 2, polarization angle error correction polarization image is utilized.
Target and bias light can resolve into natural light and polarised light, indicate are as follows:
Itotal=Ip+Iup (1)
Wherein ItotalIndicate total light intensity, IpIndicate polarised light, IupIndicate non-polarized or natural light.
According to Malus' laws, polarized systems are calculated and are expressed as follows in the light intensity that each polarization angle obtains:
Wherein, I0、I45、I90、I135Polarizing film is respectively indicated in 0 °, 45 °, 90 °, 135 ° of obtained light intensity, polarised light with
Polarizing film polarization direction angle α.
The stokes parameter of polarization image can indicate are as follows:
Wherein I, Q, U, V respectively represent the intensity of polarization image, horizontal/vertical component ,+45 °/- 45 ° components and circle
Polarized component usually ignores circular component.
Step 2.1, the polarization angle error in polarization image is corrected, polarization angle equation indicates are as follows:
Wherein, the error angle of polarization is expressed as α ', the practical angle of polarization is expressed as α.
Bring Q, U component into equation, it is available to have error angle of polarization α ' and polarization angle error delta0、Δ45、Δ90、
Δ135And the relational expression of practical angle of polarization α can indicate are as follows:
Known Δ0、Δ45、Δ90、Δ135, α ', practical angle of polarization α can be solved.
Step 2.2, the degree of polarization error in polarization image is corrected, polarization degree equation indicates are as follows:
Wherein, error degree of polarization is expressed as β ', practical degree of polarization is expressed as β.
Bring I, Q, U component into equation, it is available to have error degree of polarization β ' and polarization angle error delta0、Δ45、Δ90、
Δ135, the relational expression of practical angle of polarization α and practical degree of polarization β can indicate are as follows:
Known Δ0、Δ45、Δ90、Δ135, β ', and angle of polarization α is solved according to step 1, practical degree of polarization β can be calculated.
The utility model has the advantages that
Timesharing polarized systems are corrected according to measured polarization angle error, effectively improve polarized systems acquisition
Polarization information precision at the same time can be to the degree of polarization as caused by polarizing film angular error, angle of polarization inaccuracy
It obtains polarization image to be corrected, improves the accuracy for having obtained polarization image polarization information.
Detailed description of the invention
Fig. 1 is the polarization angle error calibration method flow chart of timesharing imaging polarization image.
Fig. 2 is visible light polarization image polarization angle correction principle figure.
Fig. 3 is infrared polarization polarization angle correct schematic diagram.
Specific embodiment
To make the purpose of the present invention, method and beneficial effect clearer, combine specific implementation example to the present invention herein
It is further described.Example discussed below is the conveniently understanding to invention in order to elaborate the purpose of invention, method,
Any restriction effect is not played to it.Method provided by the invention can both use in visible light polarized systems, can also be red
It is used in outer polarized systems.
Technical solution of the present invention provides a kind of pair of timesharing polarized imaging system correction and corrects to polarization image has been obtained
Method, including the measurement to polarizing film angular error in polarized systems, to stokes parameter, degree of polarization in polarization image
And angle of polarization information correction.Compared to uncorrected polarized systems, joined using the Stokes that the method for the present invention is calculated
Amount, degree of polarization, polarization angle information are more accurate.
Embodiment 1:
The embodiment of the present invention 1 is corrected visible light polarized systems polarizing film angular error, and Experimental Establishment includes integral
Ball, the polarizing film of Accurate Calibration angle, visible light polarized systems to be corrected.Fig. 1 is visible light polarized systems polarizing film angle mistake
Poor schematic diagram.
Include: for the polarizing film angular error bearing calibration of visible light polarized systems, specific implementation step in the present embodiment 1
Step 1, polarized systems polarizing film angular error to be corrected is measured.
Specific steps are as follows:
Step 1.1, before integrating sphere being placed in polarized systems to be corrected, guarantee that integrating sphere generates light source full of entire view
?；Integrating sphere luminous intensity is adjusted, makes polarized systems gray value lower than maximum value；
Step 1.2, the polarizing film of Accurate Calibration angle is added in integrating sphere and polarized systems, by the polarization of polarized systems
Angle adjust separately the polarizing film of calibration is rotated respectively to 0 °, 45 °, 90 °, 135 ° to -90 ° of the angle of its delustring, -
45 °, 0 °, 45 °, and its error is counted, the error for obtaining 0 °, 45 °, 90 °, 135 ° this 4 directions is respectively Δ0、Δ45、Δ90、
Δ135.For the influence for reducing random error, angular error is repeated 4 times, is averaged.
Step 2, polarization angle error correction polarization image is utilized.Target and bias light can resolve into natural light and polarization
Light indicates are as follows:
Itotal=Ip+Iup (11)
Wherein ItotalIndicate total light intensity, IpIndicate polarised light, IupIndicate non-polarized or natural light.
According to Malus' laws, polarized systems are calculated and are expressed as follows in the light intensity that each polarization angle obtains:
Wherein, I0、I45、I90、I135Polarizing film is respectively indicated in 0 °, 45 °, 90 °, 135 ° of obtained light intensity, polarised light with
Polarizing film polarization direction angle α.
The stokes parameter of polarization image can indicate are as follows:
Wherein I, Q, U respectively represent the intensity of polarization image, horizontal/vertical component ,+45 °/- 45 ° components.
Step 2.1, the polarization angle error in polarization image is corrected, polarization angle equation indicates are as follows:
Wherein, the error angle of polarization is expressed as α ', the practical angle of polarization is expressed as α.
Bring Q, U component into equation, it is available to have error angle of polarization α ' and polarization angle error delta0、Δ45、Δ90、
Δ135And the relational expression of practical angle of polarization α can indicate are as follows:
Known Δ0、Δ45、Δ90、Δ135, α ', practical angle of polarization α can be solved.
Step 2.2, the degree of polarization error in polarization image is corrected, polarization degree equation indicates are as follows:
Wherein, error degree of polarization is expressed as β ', practical degree of polarization is expressed as β.
Bring I, Q, U component into equation, it is available to have error degree of polarization β ' and polarization angle error delta0、Δ45、Δ90、
Δ135, the relational expression of practical angle of polarization α and practical degree of polarization β can indicate are as follows:
Known Δ0、Δ45、Δ90、Δ135, β ', and angle of polarization α is solved according to step 1, practical degree of polarization can be calculated
β。
So far, it completes to correct visible light polarized systems polarizing film angular error.
Embodiment 2:
The embodiment of the present invention 2 is corrected infrared polarization system polarization piece angular error, and Experimental Establishment includes that face element is black
Body, the polarizing film of Accurate Calibration angle, infrared polarization system to be corrected.Fig. 2 is that infrared polarization system polarization piece angular error is former
Reason figure.
Include: for the polarizing film angular error bearing calibration of visible light polarized systems, specific implementation step in the present embodiment 2
Step 1, polarized systems polarizing film angular error to be corrected is measured.
Specific steps are as follows:
Step 1.1, before face element black matrix being placed in polarized systems to be corrected, guarantee face element black body radiation full of entire view
?；Blackbody temperature is adjusted, makes polarized systems gray value lower than maximum value；
Step 1.2, the polarizing film of Accurate Calibration angle is added in black matrix and polarized systems, by the angle of polarization of polarized systems
Degree adjust separately the polarizing film of calibration rotate respectively to 0 °, 45 °, 90 °, 135 ° extremely with -90 ° of the angle of its delustring, -45 °,
0 °, 45 °, and its error is counted, the error for obtaining 0 °, 45 °, 90 °, 135 ° this 4 directions is respectively Δ0、Δ45、Δ90、
Δ135.For the influence for reducing random error, angular error is repeated 4 times, is averaged.
Step 2, polarization angle error correction polarization image is utilized.Target and bias light can resolve into natural light and polarization
Light indicates are as follows:
Itotal=Ip+Iup (21)
Wherein ItotalIndicate total light intensity, IpIndicate polarised light, IupIndicate non-polarized or natural light.
According to Malus' laws, polarized systems are calculated and are expressed as follows in the light intensity that each polarization angle obtains:
Wherein, I0、I45、I90、I135Polarizing film is respectively indicated in 0 °, 45 °, 90 °, 135 ° of obtained light intensity, polarised light with
Polarizing film polarization direction angle α.
The stokes parameter of polarization image can indicate are as follows:
Wherein I, Q, U respectively represent the intensity of polarization image, horizontal/vertical component ,+45 °/- 45 ° components.
Step 2.1, polarized ir is carried out to the stokes parameter obtained using publication No. CN 106289542A method
System radiant correction；
Step 2,2, the polarization angle error in polarization image is corrected, polarization angle equation indicates are as follows:
Wherein, the error angle of polarization is expressed as α ', the practical angle of polarization is expressed as α.
Bring Q, U component into equation, it is available to have error angle of polarization α ' and polarization angle error delta0、Δ45、Δ90、
Δ135And the relational expression of practical angle of polarization α can indicate are as follows:
Known Δ0、Δ45、Δ90、Δ135, α ', practical angle of polarization α can be solved.
Step 2.3, the degree of polarization error in polarization image is corrected, polarization degree equation indicates are as follows:
Wherein, error degree of polarization is expressed as β ', practical degree of polarization is expressed as β.
Bring I, Q, U component into equation, it is available to have error degree of polarization β ' and polarization angle error delta0、Δ45、Δ90、
Δ135, the relational expression of practical angle of polarization α and practical degree of polarization β can indicate are as follows:
Known Δ0、Δ45、Δ90、Δ135, β ', and angle of polarization α is solved according to step 1, practical degree of polarization β can be calculated.
So far, it completes to correct infrared polarization system polarization piece angular error.
Claims (3)
1. a kind of polarization angle error calibration method of timesharing imaging polarization system, which comprises the following steps:
Step 1, the angular error Δ of 0 ° of polarized systems, 45 °, 90 °, 135 ° this 4 directions and theoretical value is measured0、Δ45、Δ90、
Δ135；
Step 2, the polarization angle information not corrected in polarization image obtained according to above-mentioned angular error and polarized systems, under
Formula solves practical angle of polarization α,
Wherein, α ' is to have the error angle of polarization；
Step 3, according to the polarization angle information in angular error and the polarization image corrected, practical degree of polarization β is solved using following formula,
Wherein, β ' is to have error degree of polarization.
2. a kind of polarization angle error calibration method of timesharing imaging polarization system as described in claim 1, which is characterized in that
The step 1 specifically,
Step 1.1, before light source being placed in polarized systems to be corrected, guarantee that light source is full of entire visual field, adjust the intensity of light source；
Step 1.2, the polarizing film of Accurate Calibration angle is added in light source and polarized systems, by the polarization angle of polarized systems point
Be not adjusted to 0 °, 45 °, 90 °, 135 °, the polarizing film of calibration is rotated respectively to -90 ° of the angle of its delustring, -45 °, 0 °,
45 °, and its error is counted, the error for obtaining 0 °, 45 °, 90 °, 135 ° this 4 directions is respectively Δ0、Δ45、Δ90、Δ135。
3. a kind of polarization angle error calibration method of timesharing imaging polarization system as claimed in claim 2, which is characterized in that
Angular error measures at least 4 times in the step 1, is then averaged.
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| CN112630156A (en) * | 2020-02-18 | 2021-04-09 | 合肥工业大学 | Preparation method of high-precision amplitude-division simultaneous polarization imaging system |
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