CN109297910B - Polarization angle error correction method for time-sharing imaging polarization image - Google Patents

Polarization angle error correction method for time-sharing imaging polarization image Download PDF

Info

Publication number
CN109297910B
CN109297910B CN201811116998.6A CN201811116998A CN109297910B CN 109297910 B CN109297910 B CN 109297910B CN 201811116998 A CN201811116998 A CN 201811116998A CN 109297910 B CN109297910 B CN 109297910B
Authority
CN
China
Prior art keywords
polarization
degrees
angle
image
degree
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811116998.6A
Other languages
Chinese (zh)
Other versions
CN109297910A (en
Inventor
宫剑
刘亮
何友金
仇荣超
孙超
修炳楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Naval Aeronautical University
Original Assignee
Naval Aeronautical University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Naval Aeronautical University filed Critical Naval Aeronautical University
Priority to CN201811116998.6A priority Critical patent/CN109297910B/en
Publication of CN109297910A publication Critical patent/CN109297910A/en
Application granted granted Critical
Publication of CN109297910B publication Critical patent/CN109297910B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/21—Polarisation-affecting properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • G01N21/274—Calibration, base line adjustment, drift correction

Landscapes

  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention discloses a polarization angle error correction method of a time-sharing imaging polarization image, and belongs to the technical field of image processing and test measurement. The method measures the polarizer angle error of the time-sharing polarization imaging system to be corrected; then, calculating and correcting the polarization angle information of the polarization image according to the Malus law and the Stokes parameters; and finally, according to the Malus law, the Stokes parameter and the corrected polarization angle information, the information of the polarization degree is corrected. The method can eliminate the adverse effect of the angle error of the polaroid on the polarization information of the polarization image, reduce the measurement and calculation errors of the polarization degree and the polarization angle image, and improve the polarization information accuracy of the time-sharing polarization system.

Description

Polarization angle error correction method for time-sharing imaging polarization image
Technical Field
The invention relates to a polarizer angle error correction method based on time-sharing imaging polarization images, in particular to a method for correcting polarization information aiming at rotating polarizer angle errors.
Background
Compared with intensity imaging, the polarization image increases the dimensionality (such as polarization degree and polarization angle) of the polarization information of the surface of the target on the basis of the intensity imaging, the polarization characteristics can express rich information such as the surface state and material of the target, the influence of a complex background and environment on the image can be weakened, and the polarization image is widely concerned in the fields of target identification, remote sensing, bionics navigation and the like.
According to the structure difference of the polarization imaging system, the polarization imaging system is mainly divided into time-sharing imaging and simultaneous imaging. The time-sharing imaging polarization system performs polarization imaging on the same target at different moments and is suitable for a static target; meanwhile, the imaging polarization system obtains images of different polarization angles of the target through one-time exposure, and is suitable for both static targets and moving targets. Because the cost of the simultaneous imaging polarization system is high, and the time-sharing imaging system is relatively low, the time-sharing polarization imaging system is mostly adopted in the current research.
The key of the time-sharing polarization imaging system for acquiring the polarization image is that the polarizing film images the target at different angles to obtain the polarization image. In the current stage of time-sharing imaging system, a motor is generally adopted to drive a polarizer to rotate so as to respectively acquire polarization images under 4 polarization angles of 0 degree, 45 degrees, 90 degrees and 135 degrees. However, in the process of acquiring an image by adopting the method, because the initial position of the motor does not return to 0, under the influence of the rotation precision of the motor and the like, a certain error is generated between the acquired 4 polarization angles and an ideal value, which brings great influence on the accuracy of calculating polarization information.
In summary, for the time-sharing imaging polarization system, it is important to perform a correction process on the obtained polarization angle error, and it is not necessary to perform the correction process. How to correct the polarization angle error to increase the accuracy of the polarization information is an urgent problem to be solved.
Disclosure of Invention
The invention provides a polarization angle error correction method of a time-sharing polarization imaging image, which aims to correct the problem of inaccurate polarization information of a time-sharing polarization imaging system caused by polarization angle error, effectively correct the time-sharing polarization imaging system and a polarization image acquired by the time-sharing polarization imaging system, and improve the precision of the polarization system and the accuracy of polarization information
The invention discloses a polarization angle error correction method of a time-sharing imaging polarization image, which comprises the steps of firstly measuring angle errors delta of 4 directions of 0 degree, 45 degrees, 90 degrees and 135 degrees of a polarization system and theoretical values0、Δ45、Δ90、Δ135(ii) a Then, correcting the polarization angle by applying a Stokes parameter according to the angle error and the polarization angle information in the polarization image; and finally, correcting the polarization degree of the polarization image according to the Stokes parameters of the polarization image.
The invention discloses a polarization angle error correction method of a time-sharing imaging polarization image, which specifically comprises the following steps:
step 1, measuring the angle error of the polaroid of the uncorrected polarization system.
The method comprises the following specific steps:
step 1.1, placing a light source in front of a polarization system to be corrected to ensure that the light source is full of the whole field of view; adjusting the light intensity of the light source to enable the gray value of the polarization system to be lower than the maximum value;
step 1.2, polarizing plates with accurately calibrated angles are added into a light source and a polarization system, the polarization angles of the polarization system are respectively adjusted to 0 degree, 45 degrees, 90 degrees and 135 degrees, the calibrated polarizing plates are respectively rotated to-90 degrees, -45 degrees, 0 degrees and 45 degrees of extinction angles of the polarizing plates, errors of the polarizing plates are counted, and the errors in 4 directions of 0 degree, 45 degrees, 90 degrees and 135 degrees are respectively delta0、Δ45、Δ90、Δ135. To reduce the effect of random errors, the angular error is measured at least 4 times and then averaged.
And 2, correcting the polarization image by using the polarization angle error.
The target and background light can be decomposed into natural light and polarized light, and is expressed as:
Itotal＝Ip+Iup (1)
wherein ItotalRepresents the total light intensity, IpRepresenting polarized light, IupRepresenting unpolarized or natural light.
According to the Malus law, the light intensity obtained by the polarization system at each polarization angle is calculated and expressed as follows:
Figure BDA0001810848470000011
Figure BDA0001810848470000021
Figure BDA0001810848470000022
Figure BDA0001810848470000023
wherein, I0、I45、I90、I135Respectively representing the light intensities of the polaroid at 0 degrees, 45 degrees, 90 degrees and 135 degrees, and the included angle alpha between the polarized light and the polarization direction of the polaroid.
The stokes parameter of a polarization image can be expressed as:
Figure BDA0001810848470000024
where I, Q, U, V represents the intensity of the polarized image, the horizontal/vertical component, + 45/45 components, and the circularly polarized component, respectively, which is generally ignored.
Step 2.1, correcting the polarization angle error in the polarization image, and expressing an image polarization angle equation as follows:
Figure BDA0001810848470000025
where the erroneous polarization angle is denoted as α' and the actual polarization angle is denoted as α.
By substituting Q, U components into the equation, the polarization angle α' with error and the polarization angle error Δ can be obtained0、Δ45、Δ90、Δ135And the actual polarization angle α can be expressed as:
Figure BDA0001810848470000026
known as0、Δ45、Δ90、Δ135α', the actual polarization angle α can be solved.
Step 2.2, correcting the polarization degree error in the polarization image, wherein an image polarization degree equation is expressed as:
Figure BDA0001810848470000027
here, the polarization degree with error is represented as β', and the actual polarization degree is represented as β.
The I, Q, U component is substituted into the equation to obtain the polarization degree with error beta' and the polarization angle error delta0、Δ45、Δ90、Δ135The relation between the actual polarization angle α and the actual polarization degree β can be expressed as:
Figure BDA0001810848470000028
known as0、Δ45、Δ90、Δ135Beta' and the polarization angle alpha is obtained according to the solution in the step 1, and the actual polarization degree beta can be obtained through calculation.
Has the advantages that:
the time-sharing polarization system is corrected according to the measured polarization angle error, the polarization information accuracy obtained by the polarization system is effectively improved, meanwhile, the acquired polarization image with inaccurate polarization degree and polarization angle caused by the angle error of the polarizing plate can be corrected, and the accuracy of the polarization information of the acquired polarization image is improved.
Drawings
FIG. 1 is a flow chart of a method for polarization angle error correction of time-sharing imaging polarization images.
Fig. 2 is a schematic diagram of a polarization angle correction of a visible light polarization image.
Fig. 3 is a schematic diagram of polarization angle correction of an infrared polarization image.
Detailed Description
In order to make the objects, methods and advantages of the present invention more apparent, the invention is further described herein with reference to specific embodiments. The following examples are set forth to illustrate the objects and methods of the invention in detail for the purpose of understanding the invention, and are not to be construed as limiting the invention in any way. The method provided by the invention can be used in a visible light polarization system and an infrared polarization system.
The technical scheme of the invention provides a method for correcting a time-division polarization imaging system and correcting an acquired polarization image, which comprises the steps of measuring the angle error of a polarization plate in the polarization system and correcting Stokes parameters, polarization degree and polarization angle information in the polarization image. Compared with an uncorrected polarization system, the Stokes parameter, the polarization degree and the polarization angle information calculated by the method are more accurate.
Example 1:
the embodiment 1 of the invention corrects the angle error of the polaroid of the visible light polarization system, and the experimental facility comprises an integrating sphere, a polaroid for accurately calibrating the angle and the visible light polarization system to be corrected. FIG. 1 is a schematic diagram of the angle error of a polarizer of a visible light polarization system.
For the method for correcting the angle error of the polarizer of the visible light polarization system in this embodiment 1, the specific implementation steps include:
step 1, measuring the angle error of a polaroid of a polarization system to be corrected.
The method comprises the following specific steps:
step 1.1, placing an integrating sphere in front of a polarization system to be corrected, and ensuring that a light source generated by the integrating sphere is full of the whole view field; adjusting the light intensity of the integrating sphere to enable the gray value of the polarization system to be lower than the maximum value;
step 1.2, polarizing plates with accurately calibrated angles are added into an integrating sphere and a polarization system, the polarization angles of the polarization system are respectively adjusted to 0 degree, 45 degrees, 90 degrees and 135 degrees, the calibrated polarizing plates are respectively rotated to-90 degrees, -45 degrees, 0 degrees and 45 degrees of extinction angles of the polarizing plates, errors of the calibrated polarizing plates are counted, and the errors in 4 directions of 0 degree, 45 degrees, 90 degrees and 135 degrees are respectively delta0、Δ45、Δ90、Δ135. To reduce the effect of random errors, the angle error is repeated 4 times and the average is taken.
And 2, correcting the polarization image by using the polarization angle error. The target and background light can be decomposed into natural light and polarized light, and is expressed as:
Itotal＝Ip+Iup (11)
wherein ItotalRepresents the total light intensity, IpRepresenting polarized light, IupRepresenting unpolarized or natural light.
According to the Malus law, the light intensity obtained by the polarization system at each polarization angle is calculated and expressed as follows:
Figure BDA0001810848470000031
Figure BDA0001810848470000032
Figure BDA0001810848470000033
Figure BDA0001810848470000034
wherein, I0、I45、I90、I135Respectively representing the light intensities of the polarizing plate at 0 degrees, 45 degrees, 90 degrees and 135 degrees, and the included angle alpha between the polarized light and the polarization direction of the polarizing plate.
The stokes parameter of a polarization image can be expressed as:
Figure BDA0001810848470000041
where I, Q, U represent the intensity, horizontal/vertical component, + 45/45 component, respectively, of the polarized image.
Step 2.1, correcting the polarization angle error in the polarization image, and expressing an image polarization angle equation as follows:
Figure BDA0001810848470000042
where the erroneous polarization angle is denoted as α' and the actual polarization angle is denoted as α.
By substituting Q, U components into the equation, the polarization angle α' with error and the polarization angle error Δ can be obtained0、Δ45、Δ90、Δ135And the actual polarization angle α can be expressed as:
Figure BDA0001810848470000043
known as0、Δ45、Δ90、Δ135α', the actual polarization angle α can be solved.
Step 2.2, correcting the polarization degree error in the polarization image, wherein an image polarization degree equation is expressed as:
Figure BDA0001810848470000044
here, the polarization degree with error is represented as β', and the actual polarization degree is represented as β.
The I, Q, U component is substituted into the equation to obtain the polarization degree with error beta' and the polarization angle error delta0、Δ45、Δ90、Δ135The relation between the actual polarization angle α and the actual polarization degree β can be expressed as:
Figure BDA0001810848470000045
known as0、Δ45、Δ90、Δ135Beta' and obtaining the polarization angle alpha according to the solution of the step 1, and can be calculatedThe actual degree of polarization β is calculated.
Thus, the correction of the angle error of the polarizer of the visible light polarization system is completed.
Example 2:
in the embodiment 2 of the invention, the angle error of the polaroid of the infrared polarization system is corrected, and the experimental facility comprises a surface element black body, the polaroid for accurately calibrating the angle and the infrared polarization system to be corrected. FIG. 2 is a schematic diagram of an angle error of a polarizing plate of an infrared polarization system.
For the method for correcting the angle error of the polarizer of the visible light polarization system in this embodiment 2, the specific implementation steps include:
step 1, measuring the angle error of a polaroid of a polarization system to be corrected.
The method comprises the following specific steps:
step 1.1, placing a surface element black body in front of a polarization system to be corrected, and ensuring that the surface element black body is radiated to fill the whole view field; adjusting the temperature of the black body to enable the gray value of the polarization system to be lower than the maximum value;
step 1.2, polarizing plates with accurately calibrated angles are added into the black body and the polarization system, the polarization angles of the polarization system are respectively adjusted to 0 degree, 45 degrees, 90 degrees and 135 degrees, the calibrated polarizing plates are respectively rotated to-90 degrees, -45 degrees, 0 degrees and 45 degrees of the extinction angles, and the errors are counted to obtain errors in 4 directions of 0 degree, 45 degrees, 90 degrees and 135 degrees, wherein the errors are delta respectively0、Δ45、Δ90、Δ135. To reduce the effect of random errors, the angle error is repeated 4 times and the average is taken.
And 2, correcting the polarization image by using the polarization angle error. The target and background light can be decomposed into natural light and polarized light, and is expressed as:
Itotal＝Ip+Iup (21)
wherein ItotalRepresents the total light intensity, IpRepresenting polarized light, IupRepresenting unpolarized or natural light.
According to the Malus law, the light intensity obtained by the polarization system at each polarization angle is calculated and expressed as follows:
Figure BDA0001810848470000051
Figure BDA0001810848470000052
Figure BDA0001810848470000053
Figure BDA0001810848470000054
wherein, I0、I45、I90、I135Respectively representing the light intensities of the polarizing plate at 0 degrees, 45 degrees, 90 degrees and 135 degrees, and the included angle alpha between the polarized light and the polarization direction of the polarizing plate.
The stokes parameter of a polarization image can be expressed as:
Figure BDA0001810848470000055
where I, Q, U represent the intensity, horizontal/vertical component, + 45/45 component, respectively, of the polarized image.
Step 2.1, performing polarized infrared system radiation correction on the acquired Stokes parameters by applying a method with a publication number of CN 106289542A;
step 2,2, correcting the polarization angle error in the polarization image, and expressing an image polarization angle equation as follows:
Figure BDA0001810848470000056
where the erroneous polarization angle is denoted as α' and the actual polarization angle is denoted as α.
The Q, U component is substituted into the equation to obtain the polarization angle alpha' with error and the polarization angle errorΔ0、Δ45、Δ90、Δ135And the actual polarization angle α can be expressed as:
Figure BDA0001810848470000057
known as0、Δ45、Δ90、Δ135α', the actual polarization angle α can be solved.
Step 2.3, correcting the polarization degree error in the polarization image, wherein an image polarization degree equation is expressed as:
Figure BDA0001810848470000058
here, the polarization degree with error is represented as β', and the actual polarization degree is represented as β.
The I, Q, U component is substituted into the equation to obtain the polarization degree with error beta' and the polarization angle error delta0、Δ45、Δ90、Δ135The relation between the actual polarization angle α and the actual polarization degree β can be expressed as:
Figure BDA0001810848470000061
known as0、Δ45、Δ90、Δ135Beta' and the polarization angle alpha is obtained according to the solution in the step 1, and the actual polarization degree beta can be obtained through calculation.
And finishing the correction of the angle error of the polaroid of the infrared polarization system.

Claims (2)

1. A polarization angle error correction method of a time-sharing imaging polarization system is characterized by comprising the following steps:
step 1, measuring angle errors delta of 4 directions of 0 degree, 45 degrees, 90 degrees and 135 degrees of a polarization system and theoretical values0、Δ45、Δ90、Δ135；
Step 2, according to the angle error and the polarization angle information in the uncorrected polarization image obtained by the polarization system, the following formula is applied to solve the actual polarization angle alpha,
Figure FDA0002899129360000011
wherein α' is the polarization angle with error;
step 3, according to the angle error and the polarization angle information in the corrected polarization image, the following formula is applied to solve the actual polarization degree beta,
Figure FDA0002899129360000012
wherein β' is the degree of polarization with error;
the step 1 specifically comprises the following steps:
step 1.1, placing a light source in front of a polarization system to be corrected, ensuring that the light source is full of the whole field of view, and adjusting the intensity of the light source;
step 1.2, polarizing plates with accurately calibrated angles are added into a light source and a polarization system, the polarization angles of the polarization system are respectively adjusted to 0 degree, 45 degrees, 90 degrees and 135 degrees, the calibrated polarizing plates are respectively rotated to-90 degrees, -45 degrees, 0 degrees and 45 degrees of extinction angles of the polarizing plates, errors of the polarizing plates are counted, and the errors in 4 directions of 0 degree, 45 degrees, 90 degrees and 135 degrees are respectively delta0、Δ45、Δ90、Δ135。
2. The method for correcting polarization angle error of time-sharing imaging polarization system of claim 1, wherein the angle error in step 1 is measured at least 4 times and then averaged.
CN201811116998.6A 2018-09-25 2018-09-25 Polarization angle error correction method for time-sharing imaging polarization image Active CN109297910B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811116998.6A CN109297910B (en) 2018-09-25 2018-09-25 Polarization angle error correction method for time-sharing imaging polarization image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811116998.6A CN109297910B (en) 2018-09-25 2018-09-25 Polarization angle error correction method for time-sharing imaging polarization image

Publications (2)

Publication Number Publication Date
CN109297910A CN109297910A (en) 2019-02-01
CN109297910B true CN109297910B (en) 2021-05-18

Family

ID=65164240

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811116998.6A Active CN109297910B (en) 2018-09-25 2018-09-25 Polarization angle error correction method for time-sharing imaging polarization image

Country Status (1)

Country Link
CN (1) CN109297910B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112630156B (en) * 2020-02-18 2023-06-16 合肥工业大学 Preparation method of high-precision amplitude-division simultaneous polarization imaging system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101893659A (en) * 2009-05-19 2010-11-24 清华大学 Method and device for detecting polarization direction of electromagnetic wave
CN103411890A (en) * 2013-07-18 2013-11-27 华中科技大学 Rotating compensator type ellipsometer system error assessment and elimination method thereof
CN104048922A (en) * 2014-06-26 2014-09-17 北京理工大学 Method for measuring polarization degree and polarization angle of fluorescence spectrum
CN104833425A (en) * 2015-04-24 2015-08-12 北京理工大学 Combination method of polarizer angles in polarization imaging system
CN105698819A (en) * 2016-01-18 2016-06-22 中国人民解放军国防科学技术大学 Calibration method for multi-camera polarized light sensor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1826605A1 (en) * 2006-02-24 2007-08-29 Semiconductor Energy Laboratory Co., Ltd. Display device
CN101666626B (en) * 2008-09-03 2012-02-29 睿励科学仪器（上海）有限公司 Method for ellipsometry and device thereof
US9717444B2 (en) * 2012-08-02 2017-08-01 Mark Bosin Optical polarization shift measuring system
CN105300523B (en) * 2015-10-09 2017-06-27 北京航空航天大学 A kind of polarization calibrating method of light field polarized imaging system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101893659A (en) * 2009-05-19 2010-11-24 清华大学 Method and device for detecting polarization direction of electromagnetic wave
CN103411890A (en) * 2013-07-18 2013-11-27 华中科技大学 Rotating compensator type ellipsometer system error assessment and elimination method thereof
CN104048922A (en) * 2014-06-26 2014-09-17 北京理工大学 Method for measuring polarization degree and polarization angle of fluorescence spectrum
CN104833425A (en) * 2015-04-24 2015-08-12 北京理工大学 Combination method of polarizer angles in polarization imaging system
CN105698819A (en) * 2016-01-18 2016-06-22 中国人民解放军国防科学技术大学 Calibration method for multi-camera polarized light sensor

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
TECHNIQUES FOR MEASUREMEN OF SPIN-1/2 AND SPIN-1 POLARIZATION ANALYZING TENSORS;GERALD G. OHLSEN et al;《NUCLEAR INSTRUMENTS AND METHODS》;19731231;第41-49页 *
The Dependence of Sea-Surface Microwave Emission on Wind Speed, Frequency, Incidence Angle, and Polarzation over the Frequency Range from 1 to 40 GHz;YASUNORI SASAKI et al;《IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING》;19870331;第GE-25卷(第2期);第138-146页 *
基于双Wollaston棱镜的偏振测量系统的精度分析;陈立刚 等;《激光技术》;20081031;第32卷(第5期);第1756-1761页 *
高量级光衰减时对线偏振片组衰光系数的研究;黄翀 等;《物理学报》;20100331;第59卷(第3期);第468-470页 *

Also Published As

Publication number Publication date
CN109297910A (en) 2019-02-01

Similar Documents

Publication Publication Date Title
CN109655079B (en) Method for measuring coordinate system from star sensor to prism coordinate system
CN104729537B (en) A kind of in-orbit real-time compensation method of star sensor low frequency aberration
CN110793430B (en) Absolute electrical angle detection method, system and computer readable storage medium
US20080120056A1 (en) Angular velocity calibration method
WO2016112829A1 (en) Direct-reading gauge capable of eliminating magnetic interference of adjacent rotary wheel
CN103528694A (en) Method for measuring temperature of target object by using thermal infrared imager
CN111595462B (en) Infrared imaging temperature measurement system calibration method and device, computing equipment and storage medium
US10132654B2 (en) Error compensation in an angle sensor
CN107633533B (en) High-precision circular mark point center positioning method and device under large-distortion lens
US11015958B2 (en) Initialization method and initialization device
CN109297910B (en) Polarization angle error correction method for time-sharing imaging polarization image
WO2022104816A1 (en) Temperature compensation method and system for thermal camera
CN106705860B (en) A kind of laser distance measurement method
CN109798921A (en) Calibration method in a kind of star sensor elements of interior orientation room
CN103591973A (en) Nonlinear least square tri-axial vector sensor high-precision correction method
CN110793542A (en) Area array optical remote sensing satellite in-orbit geometric calibration method based on generalized probe element pointing angle
CN112686961A (en) Method and device for correcting calibration parameters of depth camera
CN104504197A (en) Archimedes spiral planar thread measurement model and eccentric parameter correction method
CN114018416A (en) Thermal infrared camera radiation calibration method and system
CN107240077B (en) Visual measurement method based on elliptic conformation deviation iterative correction
CN109064517B (en) Optical axis perpendicularity adjusting method and device
CN110674888B (en) Head posture recognition method based on data fusion
CN109655080B (en) On-orbit calibration method for digital sun sensor
US8219348B2 (en) Method for calibrating and/or correcting a display device having a needle, the needle being able to move in rotation about an axis of rotation
US20200300788A1 (en) Method for measuring fiber orientation degree, fiber orientation degree measurement apparatus, and control computer program for fiber orientation degree measurement apparatus

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant