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浏览/检索结果: 共14条，第1-10条 帮助

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Machine Learning-based Identification of Contaminated Images in Light Curve Data Preprocessing 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2024, 卷号: 24, 期号: 4
作者:  Li H(李徽);  Li RW(李荣旺);  Shu P(舒鹏);  Li YQ(李语强)
  |  收藏  |  浏览/下载：26/0  |  提交时间：2024/05/06
Resource-based cities: Spatial structure and evolutionary identification based on nighttime light images 期刊论文  OAI收割
FRONTIERS IN EARTH SCIENCE, 2022, 卷号: 10, 页码: 16
作者:  Lu, Shuo;  Zhang, Wenzhong;  Li, Jiaming;  Wang, Shaohua
  |  收藏  |  浏览/下载：40/0  |  提交时间：2022/11/09
Resource-based cities: Spatial structure and evolutionary identification based on nighttime light images 期刊论文  OAI收割
FRONTIERS IN EARTH SCIENCE, 2022, 卷号: 10, 页码: 16
作者:  Lu, Shuo;  Zhang, Wenzhong;  Li, Jiaming;  Wang, Shaohua
  |  收藏  |  浏览/下载：19/0  |  提交时间：2022/11/09
A 4F optical diffuser system with spatial light modulators for image data augmentation 期刊论文  OAI收割
Optics Communications, 2021, 卷号: 488
作者:  Li, Baopeng;  Ersoy, Okan K.;  Ma, Caiwen;  Pan, Zhibin;  Wen, Wansha
  |  收藏  |  浏览/下载：42/0  |  提交时间：2021/03/09
CameraLink image data fiber transmission technology based on MAX9259/MAX9260 期刊论文  OAI收割
Chinese Optics, 2018, 卷号: 11, 期号: 6, 页码: 1017-1023
作者:  Chen, Yang-Jun;  Wu, Zhi-Yong
  |  收藏  |  浏览/下载：35/0  |  提交时间：2019/09/17
Deblurring for spatial and temporal varying motion with optical computing 期刊论文  OAI收割
optical engineering, 2016, 卷号: 55, 期号: 5
作者:  Xiao, Xiao;  Xue, Dongfeng;  Hui, Zhao
收藏  |  浏览/下载：219/0  |  提交时间：2016/10/13
Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Gu S.; Yan Y.; Xu K.; Jin G.
收藏  |  浏览/下载：47/0  |  提交时间：2013/03/25
With the development of aerospace remote sensing technology  the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures  the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera  the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera  the compensation method of image motion to space camera is researched. First  the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second  the system adopts 80C31 as controller of drift angle  and adopts stepping motor for actuators  and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced  and it achieve the closed-loop control of the drift angle position. At the last  this paper analyses the transmission precision of the mechanism. Through the experiment  we measured the actual precision of the image motion compensation mechanism  and compared with the theoretical analysis. There are two major contributions in this paper. First  the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism  it will bring adverse effects for the precision and stiffness of mechanism. For this problem  This paper designed a image motion compensation that have some advantages such as small size  light weight at the same time  high precision  stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second  the traditional mechanism control need to corrected  fitting and iterative for the control formula of mechanism. Only in this way  we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting  It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5  -4  -3  -2  -1  0  +1  +2  +3  +4  +4 as the expectation value of the imaginary drift angle  we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'  and it can achieve the high-precision image motion compensation. 2011 SPIE.  
High-performance illumination system design with new light source of LD array for laser projection display 期刊论文  OAI收割
proceedings of spie- the international society for optical engineering, Proceedings of SPIE- The International Society for Optical Engineering, 2011, 2011, 卷号: 8335, 8335, 页码: 83350f, 83350F
作者:  Dong, Hui;  Zhang, Yunfang;  Li, Hui;  Duan, Jingyuan;  Shi, Ancun
  |  收藏  |  浏览/下载：180/0  |  提交时间：2012/06/14
Gimbal displacement error analysis on an electro-optical seeker (EI CONFERENCE) 会议论文  OAI收割
Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China
作者:  Zhang X.;  Zhang X.;  Zhang X.
收藏  |  浏览/下载：32/0  |  提交时间：2013/03/25
It is essential to analyze the gimbal displacement errors for a seeker due to the importance for cueing of targets and tracking for the final approach. Otherwise  for a seeker electro-driven with a concentric glass dome  the large errors will decrease the picking  pointing  and tracking precision rooted from the displacement errors existing between the rotation center of the optical system and the gimbal. And the gimbaled camera system displacement errors are never eliminated but reduced due to the geometric errors consists of geometric tolerances of gimbal structure  manufacture  installation and vibration coming from working environment. In this paper  the gimbal displacement errors in an electro-optically stabilized platform resulting from geometric errors and environment errors were analyzed and shown in detail. The mathematical modal of the gimbal displacement errors created based on multi-body dynamics demonstrated the connection between the gimbal displacement errors and the stabilized platform. Taking a visible light image seeker as a case  the diameter is 120mm  and the geometric tolerances came from the values of primary design and the vibration data came from the environmental vibration test on the pitch-yaw seeker  and at the same time  the errors resulting from installation were considered too. Based on calculating  the maximum gimbal displacement error will reach to 0.2mm for pitching angle smaller than 40 and yawing angle smaller than 60. However  the critical parts have been found out according to the probability theory and the reliability analysis successfully used in the paper  and finally  the maximum gimbal displacement error reduced to 0.1mm  which is acceptable corresponding to the picking  pointing and tracking precision for an optical imaging seeker. 2010 Copyright SPIE - The International Society for Optical Engineering.  
Development and radiance calibration of three-waveband camera (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photonics and Optoelectronics, SOPO 2010, June 19, 2010 - June 21, 2010, Chengdu, China
作者:  Wang J.;  Liu Y.;  Liu Y.;  Sun Q.;  Liu Y.
收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25
An imaging system with three-waveband sharing one lens and an area CCD was developed. By rotating different filters into the beam path  the required waveband was selected. The optical system which can image in ultraviolet  visible and near infrared region was designed and the signal collecting system was integrated. The optical design and system integration have some advantages such as low cost  small size and light in weight. To obtain a high imaging quality  the radiation calibration is carried out in order to establish the relation between the average grey level of output image and the input radiance from the integrating sphere. According to the calibration data in experiments  the radiation dynamic range and the best working point of the system are determined. The experiment result shows that the dynamic range of the image system is maximal when the exposure time is 8ms in ultraviolet  0.5ms in visible and 0.125ms in near infrared region. 2010 IEEE.