中国科学院机构知识库网格系统: 检索

Research on a Super-Sub-Arc Bivariate Relative Angle Thermal Deformation Testing Method without Pitch Angle Limitation 期刊论文 OAI收割
APPLIED SCIENCES-BASEL, 2023, 卷号: 13, 期号: 17
作者: Liu, Yang; Xue, Yaoke; Wang, Hu; Pan, Yue; Lin, Shangmin

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收藏 | 浏览/下载：77/0 | 提交时间：2023/10/08

not limited by pitch angle thermal deformation bivariate angle ultra-sub-arc position-sensitive device displacement coordinate analysis algorithm matrix comparison method integrated measurement equipment

Limited View Tomographic Reconstruction Using a Cascaded Residual Dense Spatial-Channel Attention Network With Projection Data Fidelity Layer 期刊论文 OAI收割
IEEE TRANSACTIONS ON MEDICAL IMAGING, 2021, 卷号: 40, 期号: 7, 页码: 1792-1804
作者: Zhou, Bo; Zhou, S. Kevin; Duncan, James S.; Liu, Chi

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收藏 | 浏览/下载：42/0 | 提交时间：2021/12/01

Tomographic reconstruction cascaded network projection data fidelity layer RedSCAN limited angle sparse view

A Joint Reconstruction and Segmentation Method for Limited-Angle X-Ray Tomography 期刊论文 OAI收割
IEEE ACCESS, 2018, 卷号: 6, 页码: 7780-7791
作者: Wei, L; Wei ZH(魏增辉); Liu BD(刘宝东); Wei, ZH; Liu, BD

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收藏 | 浏览/下载：31/0 | 提交时间：2019/09/24

Limited-angle Mumford-Shah PCMS discrete tomography prior knowledge

A joint reconstruction and segmentation method for limited-angle x-ray tomography 期刊论文 iSwitch采集
Ieee access, 2018, 卷号: 6, 页码: 7780-7791
作者: Wei, Zenghui; Liu, Baodong; Dong, Bin; Wei, Long

收藏 | 浏览/下载：62/0 | 提交时间：2019/04/23

Limited-angle Mumford-shah Pcms Discrete tomography Prior knowledge

LABTM control system based on FPGA (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan
作者: Wang Y.; Yu P.; Yu P.; Wang Y.; Wang Y.

收藏 | 浏览/下载：153/0 | 提交时间：2013/03/25

This paper presents the digital PI control method for design and simulation of a high precision limited angle brushless torque motor control system in Field Programmable Gate Array device (FPGA). The direct drive structures which are widely applied in many servo control fields. Matlab Xilinx System GeneratorR toolbox based on Fixed-Point Arithmetic is used to design the digital PI controller using DSP architecture plot the responses of the control system and generate the VHDL source code. The control system model consists of a digital PI a real LABTM and a real absolute Inductosyn encoder to rpm and position blocks. Through loading generated codes in process of the simulation that built by the digital discrete model it is verified that the rising time of current loop is only 1.2ms and rate loop is 8ms overshoot is rarely 4.2%. Finally the comprehensive positioning accuracy of system can reach up to 5 arc sec and the rate jitter achieves 5% with the 4 arc sec accuracy absolute Inductosyn. (2013) Trans Tech Publications Switzerland.

Image quality assessment based on complex representation of structure information (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electrical, Information Engineering and Mechatronics, EIEM 2011, December 23, 2011 - December 25, 2011, Jiaozuo, Henan, China
作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

Local variance and single pixel value are combined to describe image structure information using complex method in this paper in order to improve the consistency of objective image assessment result with that of subjective method. The effect of the detail structure information on the image quality was emphasized by this method accordingly. Singular value decomposition was performed on local variance distribution complex matrix. The angle between the singular value vectors of the reference image and the disturbed image was used to measure their structural similarity. Then the quality assessment process was achieved. Results from experiments show that the proposed method is better consistent with human visual system characteristics than MSE PSNR and SSIM. 2012 Springer-Verlag London Limited.

Optimization for limited angle tomography in medical image processing 期刊论文 OAI收割
pattern recognition, 2011, 卷号: 44, 期号: 10-11, 页码: 2427-2435
作者: Lu, Xiaoqiang; Sun, Yi; Yuan, Yuan

收藏 | 浏览/下载：17/0 | 提交时间：2011/09/30

Limited angle tomography Ill-posed inverse problem Total variation (TV)

Image reconstruction by an alternating minimisation 期刊论文 OAI收割
neurocomputing, 2011, 卷号: 74, 期号: 5, 页码: 661-670
作者: Lu, Xiaoqiang; Sun, Yi; Yuan, Yuan

收藏 | 浏览/下载：205/60 | 提交时间：2011/01/11

Limited angle tomography III-posed inverse problem Total variation (TV)

Effect of gimbal point displacement on optical axis pointing precision in an image seeker (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：39/0 | 提交时间：2013/03/25

A concentric glass spherical dome was usually chosen as the transparent window mounted in front of the optical lens in an image seeker. However optical ray had to change its direction when propagating through the dome due to refraction unless passing through the center of the dome which demanded gimbal point coincide with the center of the dome exactly. In fact gimbal point displacement could not be eliminating due to fabrication assembly and vibration therefore the optical axis pointing error generated. In this paper the effect of gimbal point displacement on optical axis pointing precision in an image seeker was analyzed and the theoretical expression of the optical axis pointing error was derived based on geometric optics and the error dynamics was explored by numerical. Take a visible light image seeker as a case the thickness of concentric glass spherical dome was 8mm and the inner radius was 72mm and the optical axis pointing errors varying dynamically with the look angle and the gimbal point displacement were shown in graph. When the gimbal displacement was 0.11mm the maximum optical axis pointing error was 0.054mrad that is equal to the instantaneous field of view (IFOV) corresponding to the camera system whose focal length was 120mm and pixel size was 6.5m. Furthermore with the gimbal displacement increasing the optical axis pointing error increased linearly. The analyzed results provided a theoretical basis for the displacement range which had to be limited strictly in the gimbal design process. 2011 IEEE.

Three-sample rotation vector algorithm with angular rate input (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
作者: Zhang Y.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

In order to research the attitude algorithm with angular rate input under the conical motion a optimal threesample rotation vector algorithm based on single-step Newton backward interpolation is proposed. Using the principle of limited rigid body rotation and the characteristic of angular rate input three-sample rotation vector algorithm is derivated. To minimum attitude errors three-sample rotation vector algorithm is optimized. Three angular rate extraction methods of singlestep entire sample recursion multi-step entire sample and singlestep Newton backward interpolation are proposed. Under the condition of conical motion with semi-cone angle 3 and angular frequency 2rad/s simulation is done. The simulation results show that single-step Newton backward interpolation is superior to the other two methods and its maximum error peak is 0.01 error drift rate is 0.036/h. Experiments in three-axis flying turntable with the same parameters are carried out and the results show that error drift rates of three-channels are less than those of traditional quaternion which are 13.53% 12.08% and 23.68% lower respectively. It also verified that the new algorithm can perform a high accuracy under the conical motion. 2011 IEEE.