Calibration method for equivalent extinction ratio of polarized pixel in integrated micropolarizer array camera

2017 ◽  
Author(s):  
Bin Feng ◽  
Zelin Shi ◽  
Haizheng Liu ◽  
Yaohong Zhao ◽  
Jianting Liu
Keyword(s):  
Extinction Ratio ◽  
Calibration Method ◽  
Array Camera

Calibration Method for Linear Array Camera of Intersection Measurement System

2016 ◽  
Vol 45 (6) ◽  
pp. 612003 ◽  
Author(s):  
吴培 WU Pei ◽  
王延杰 WANG Yan-jie ◽  
孙宏海 SUN Hong-hai ◽  
姚志军 YAO Zhi-jun ◽  
武治国 WU Zhi-guo
Keyword(s):  
Measurement System ◽  
Linear Array ◽  
Calibration Method ◽  
Array Camera

scholarly journals Sensor Modeling and Calibration Method Based on Extinction Ratio Error for Camera-Based Polarization Navigation Sensor

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3779
Author(s):  
Haonan Ren ◽  
Jian Yang ◽  
Xin Liu ◽  
Panpan Huang ◽  
Lei Guo
Keyword(s):  
Extinction Ratio ◽  
Calibration Method ◽  
Degree Of Polarization ◽  
Model Parameters ◽  
Calibration Model ◽  
Ratio Error ◽  
Polarization Sensor ◽  
Orthogonal Channels ◽  
Sensor Modeling ◽  
Indoor And Outdoor

The performance of camera-based polarization sensors largely depends on the estimated model parameters obtained through calibration. Limited by manufacturing processes, the low extinction ratio and inconsistency of the polarizer can reduce the measurement accuracy of the sensor. To account for the challenges, one extinction ratio coefficient was introduced into the calibration model to unify the light intensity of two orthogonal channels. Since the introduced extinction ratio coefficient is associated with degree of polarization (DOP), a new calibration method considering both azimuth of polarization (AOP) error and DOP error for the bionic camera-based polarization sensor was proposed to improve the accuracy of the calibration model parameter estimation. To evaluate the performance of the proposed camera-based polarization calibration model using the new calibration method, both indoor and outdoor calibration experiments were carried out. It was found that the new calibration method for the proposed calibration model could achieve desirable performance in terms of stability and robustness of the calculated AOP and DOP values.

scholarly journals A METHOD FOR SELF-CALIBRATION IN SATELLITE WITH HIGH PRECISION OF SPACE LINEAR ARRAY CAMERA

2016 ◽  
Vol XLI-B1 ◽  
pp. 361-364
Author(s):  
Wei Liu ◽  
Fangming Qian ◽  
Yuzhe Miao ◽  
Rongjian Wang
Keyword(s):  
Real Time ◽  
Linear Array ◽  
Focal Length ◽  
Calibration Method ◽  
Geometric Parameters ◽  
Self Calibration ◽  
The Matrix ◽  
Array Camera ◽  
Ground Calibration ◽  
Matrix Array

At present, the on-orbit calibration of the geometric parameters of a space surveying camera is usually processed by data from a ground calibration field after capturing the images. The entire process is very complicated and lengthy and cannot monitor and calibrate the geometric parameters in real time. On the basis of a large number of on-orbit calibrations, we found that owing to the influence of many factors, e.g., weather, it is often difficult to capture images of the ground calibration field. Thus, regular calibration using field data cannot be ensured. This article proposes a real time self-calibration method for a space linear array camera on a satellite using the optical auto collimation principle. A collimating light source and small matrix array CCD devices are installed inside the load system of the satellite; these use the same light path as the linear array camera. We can extract the location changes of the cross marks in the matrix array CCD to determine the real-time variations in the focal length and angle parameters of the linear array camera. The on-orbit status of the camera is rapidly obtained using this method. On one hand, the camera’s change regulation can be mastered accurately and the camera’s attitude can be adjusted in a timely manner to ensure optimal photography; in contrast, self-calibration of the camera aboard the satellite can be realized quickly, which improves the efficiency and reliability of photogrammetric processing.

scholarly journals A METHOD FOR SELF-CALIBRATION IN SATELLITE WITH HIGH PRECISION OF SPACE LINEAR ARRAY CAMERA

2016 ◽  
Vol XLI-B1 ◽  
pp. 361-364 ◽  
Author(s):  
Wei Liu ◽  
Fangming Qian ◽  
Yuzhe Miao ◽  
Rongjian Wang
Keyword(s):  
Real Time ◽  
Linear Array ◽  
Focal Length ◽  
Calibration Method ◽  
Geometric Parameters ◽  
Self Calibration ◽  
The Matrix ◽  
Array Camera ◽  
Ground Calibration ◽  
Matrix Array

At present, the on-orbit calibration of the geometric parameters of a space surveying camera is usually processed by data from a ground calibration field after capturing the images. The entire process is very complicated and lengthy and cannot monitor and calibrate the geometric parameters in real time. On the basis of a large number of on-orbit calibrations, we found that owing to the influence of many factors, e.g., weather, it is often difficult to capture images of the ground calibration field. Thus, regular calibration using field data cannot be ensured. This article proposes a real time self-calibration method for a space linear array camera on a satellite using the optical auto collimation principle. A collimating light source and small matrix array CCD devices are installed inside the load system of the satellite; these use the same light path as the linear array camera. We can extract the location changes of the cross marks in the matrix array CCD to determine the real-time variations in the focal length and angle parameters of the linear array camera. The on-orbit status of the camera is rapidly obtained using this method. On one hand, the camera’s change regulation can be mastered accurately and the camera’s attitude can be adjusted in a timely manner to ensure optimal photography; in contrast, self-calibration of the camera aboard the satellite can be realized quickly, which improves the efficiency and reliability of photogrammetric processing.

Practical color calibration method for multi-projectors display

2009 ◽  
Vol 29 (4) ◽  
pp. 982-986
Author(s):  
Jun ZHANG ◽  
Bang-ping WANG ◽  
Cheng YI ◽  
Xiao-feng LI ◽  
Hui LI
Keyword(s):  
Calibration Method ◽  
Color Calibration

A Calibration Method for Mutual Coupling Across a Vector Sensor

2013 ◽  
Vol 34 (7) ◽  
pp. 1558-1561 ◽  
Author(s):  
Gui-bao Wang ◽  
Hai-hong Tao ◽  
Lan-mei Wang
Keyword(s):  
Mutual Coupling ◽  
Calibration Method ◽  
Vector Sensor

Kinematic Calibration Method of Robots Based on Distance Error

ROBOT ◽  
2013 ◽  
Vol 35 (5) ◽  
pp. 600 ◽  
Author(s):  
Wenbin GAO ◽  
Hongguang WANG ◽  
Yong JIANG ◽  
Xin'an PAN
Keyword(s):  
Calibration Method ◽  
Kinematic Calibration ◽  
Distance Error

An Online Calibration Method for Manipulator with Joint Clearance

ROBOT ◽  
2013 ◽  
Vol 35 (5) ◽  
pp. 521
Author(s):  
Feng WANG ◽  
Kai CHEN ◽  
Xiaoping CHEN
Keyword(s):  
Calibration Method ◽  
Joint Clearance ◽  
Online Calibration
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