Study of image motion compensation in spectral imaging system

2016 ◽  
Author(s):  
Zhijun Li ◽  
Xing Long Chen
Keyword(s):  
Motion Compensation ◽  
Imaging System ◽  
Spectral Imaging ◽  
Image Motion

scholarly journals Line of Sight and Image Motion Compensation for Step and Stare Imaging System

2020 ◽  
Vol 10 (20) ◽  
pp. 7119
Author(s):  
Jihong Xiu ◽  
Pu Huang ◽  
Jun Li ◽  
Hongwen Zhang ◽  
Youyi Li
Keyword(s):  
High Resolution ◽  
Motion Compensation ◽  
Imaging System ◽  
Control Flow ◽  
Image Motion ◽  
Line Of Sight ◽  
Pointing Accuracy ◽  
High Resolution Images ◽  
Pointing Control ◽  
And Control

In recent years, applications such as marine search and rescue, border patrol, etc. require electro-optical equipment to have both high resolution and precise geographic positioning abilities. The step and stare working based on a composite control system is a preferred solution. This paper proposed a step and stare system composed of two single-axis fast steering mirrors and a two-axis gimbal. The fast steering mirrors (FSMs) realize image motion compensation and the gimbal completes pointing control. The working principle and the working mode of the system are described first. According to the imaging optical path, the algorithm and control flow of the line of sight (LOS) and image motion compensation are developed. The proposed method is verified through ground imaging and flight tests. Under the condition of flight, the pointing accuracy of the target can be controlled within 15 m. The proposed algorithm can achieve effective motion compensation and get high-resolution images. This achieves high resolution and accurate LOS simultaneously.

scholarly journals Conceptual Design and Image Motion Compensation Rate Analysis of Two-Axis Fast Steering Mirror for Dynamic Scan and Stare Imaging System

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6441
Author(s):  
Jianjun Sun ◽  
Yalin Ding ◽  
Hongwen Zhang ◽  
Guoqin Yuan ◽  
Yuquan Zheng
Keyword(s):  
Motion Compensation ◽  
Imaging System ◽  
Flight Test ◽  
Transformation Method ◽  
Dynamic Imaging ◽  
Image Motion ◽  
Dual Band ◽  
Rate Equations ◽  
Rate Analysis ◽  
Dynamic Scan

In order to enable the aerial photoelectric equipment to realize wide-area reconnaissance and target surveillance at the same time, a dual-band dynamic scan and stare imaging system is proposed in this paper. The imaging system performs scanning and pointing through a two-axis gimbal, compensating the image motion caused by the aircraft and gimbal angular velocity and the aircraft liner velocity using two two-axis fast steering mirrors (FSMs). The composition and working principle of the dynamic scan and stare imaging system, the detailed scheme of the two-axis FSM and the image motion compensation (IMC) algorithm are introduced. Both the structure and the mirror of the FSM adopt aluminum alloys, and the flexible support structure is designed based on four cross-axis flexural hinges. The Root-Mean-Square (RMS) error of the mirror reaches 15.8 nm and the total weight of the FSM assembly is 510 g. The IMC rate equations of the two-axis FSM are established based on the coordinate transformation method. The effectiveness of the FSM and IMC algorithm is verified by the dynamic imaging test in the laboratory and flight test.

Efficient onboard image motion compensation for orbital inclination and eccentricity of geostationary weather satellites

2020 ◽  
Vol 234 (7) ◽  
pp. 1311-1325
Author(s):  
MP Ramachandran ◽  
MK Agarwal ◽  
DA Daniel
Keyword(s):  
Motion Compensation ◽  
Satellite Images ◽  
Software Tool ◽  
Image Motion ◽  
Wind Vector ◽  
Orbital Inclination ◽  
Scanning Mirror ◽  
The Earth ◽  
Detail Image ◽  
Geographical Locations

Image registration is important in geostationary weather satellites. Achieving consistent registration of the images with respect to the geographical locations on the Earth is here of interest. The consistency in the registration between the images is affected whenever the orbital inclination and eccentricity are not zero. The imaging payload has a two-axis scanning mirror to capture the Earth image. The above orbital effects together with scan mirror pointing direction are the factors that cause the misregistration. This paper presents an onboard algorithm that provides the scan compensation angles due to the above factors and achieves consistent registration. The compensation varies every second, which is the time taken for each scan. Hence it is preferred to have computations onboard than to have ground based bulk uplinks for the scan compensation. The paper presents an algorithm that is useful, say, when (i) the onboard computing capabilities are limited, (ii) the navigation accuracies are coarse and (iii) the image resampling is not preferred on the ground and the payload data are directly used for weather applications. The paper also discusses the tests that were carried on the onboard software in order to validate its performance in achieving the consistent registration before launch. This is done by using another independent software tool which is also described in detail. Image motion algorithm was invoked for a couple of days in INSAT 3DR. The atmospheric wind vector deduced directly from the satellite images is given at the end.

scholarly journals Analysis of Compound Stained Cervical Cell Images Using Multi-Spectral Imaging

2021 ◽  
Vol 11 (12) ◽  
pp. 5628
Author(s):  
Run Fang ◽  
Libo Zeng ◽  
Fan Yi
Keyword(s):  
Cervical Cancer ◽  
Mouse Liver ◽  
Imaging System ◽  
Color Image ◽  
Imaging Technique ◽  
Screening Method ◽  
Spectral Imaging ◽  
High Accuracy ◽  
Cervical Cell ◽  
Real World Applications

Multi-spectral imaging technique plays an important role in real-world applications such as medicine and medical detections. This paper proposes a cervical cancer cell screening method to simultaneously adopt TBS classification and DNA quantitative analysis for a single cell smear. Through using compound staining on a smear, the cytoplasm is stained by Papanicolauo and the nucleus is stained by Feulgen. The main evaluation parameter is the DNA content of the nucleus, not the subjective description of cell morphology, which is more objective than the TBS classification method and reduces the chances of missing a diagnosis due to subjective factors. Each nucleus has its own DI value and color image of the whole cell, which is convenient for doctors as it allows them to review and confirm the morphology of cells with a nucleus DI of over 2.5. Mouse liver smears and cervical cases are utilized as the measuring specimens to evaluate the performance of the microscope multi-spectral imaging system; illustrative results demonstrate that the proposed system qualifies, with high accuracy and reliability, and further presents wide application prospects in the early diagnosis of cervical cancer.

UAV based Multi-spectral Imaging System for Environmental Monitoring

2011 ◽  
Vol 78 (11) ◽  
pp. 503-507 ◽  
Author(s):  
Martin De Biasio ◽  
T. Arnold ◽  
R. Leitner
Keyword(s):  
Environmental Monitoring ◽  
Imaging System ◽  
Spectral Imaging

Research on filter selection method for broadband spectral imaging system based on ancient murals

2015 ◽  
Vol 41 (6) ◽  
pp. 585-595 ◽  
Author(s):  
Jinxing Liang ◽  
Xiaoxia Wan ◽  
Qiang Liu ◽  
Chan Li ◽  
Junfeng Li
Keyword(s):  
Imaging System ◽  
Spectral Imaging ◽  
Selection Method ◽  
Filter Selection

scholarly journals Miniature Compressive Ultra-spectral Imaging System Utilizing a Single Liquid Crystal Phase Retarder

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Isaac August ◽  
Yaniv Oiknine ◽  
Marwan AbuLeil ◽  
Ibrahim Abdulhalim ◽  
Adrian Stern
Keyword(s):  
Liquid Crystal ◽  
Imaging System ◽  
Spectral Imaging ◽  
Crystal Phase ◽  
Liquid Crystal Phase

Design of a Hyper-Spectral Imaging System for Gross Pathology of Pigmented Skin Lesions

2021 ◽  
Author(s):  
Eleni Aloupogianni ◽  
Masahiro Ishikawa ◽  
Takaya Ichimura ◽  
Atsushi Sasaki ◽  
Naoki Kobayashi ◽  
...  
Keyword(s):  
Imaging System ◽  
Spectral Imaging ◽  
Skin Lesions ◽  
Gross Pathology ◽  
Hyper Spectral ◽  
Hyper Spectral Imaging ◽  
Pigmented Skin Lesions
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