中国科学院机构知识库网格系统: 检索

Correlation Filter Tracking Algorithm Based on Filter Space Constraint and Object Re-Detection 会议论文 OAI收割
Dalian, China, 2023 - 7 - 27
作者: Tian, Yan; Ren, Sixi; Xu, Zhaohui; Zhang, Yongkang

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收藏 | 浏览/下载：8/0 | 提交时间：2023/11/23

object tracking correlation filtering boundary effect object re-detection

Applications of differential barometric altimeter in ground cellular communication positioning network 期刊论文 OAI收割
IET SCIENCE MEASUREMENT & TECHNOLOGY, 2020, 卷号: 14, 期号: 3, 页码: 322-331
作者: Hu, Zhengqun; Zhang, Lirong; Ji, Yuanfa

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收藏 | 浏览/下载：25/0 | 提交时间：2021/12/06

cellular radio height measurement measurement errors Global Positioning System altimeters barometers least squares approximations Kalman filters surface fitting spread spectrum communication compensation matrix algebra GPS signal message structure power spectrum spread spectrum ranging signal fitting parameters least-square solution calibration compensation system noise variance matrix measurement noise variance matrix multibase station correction height information correction calculation DBA system systematic performance differential barometric altimeter ground cellular communication positioning network measurement datum distribution altitude positioning error Global Positioning System differential barometric altimetry system systematic implementation level continuous altitude measurement precise altitude measurement DBA systematic implementation aspect two dimensional curved surface fitting function sensor measurement correction filtering effect Kalman filter measuring station multiBSs navigation fusion

Trend Analysis of Relationship between Primary Productivity, Precipitation and Temperature in Inner Mongolia 期刊论文 OAI收割
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION, 2018, 卷号: 7, 期号: 6
作者: Chen, Tianyang; Xie, Yichun; Liu, Chao; Bai, Yongfei; Zhang, Anbing

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收藏 | 浏览/下载：29/0 | 提交时间：2022/02/25

Inner Mongolia vegetation growth climate change partial effect EMD filtering redundancy analysis

基于性状的黄土高原草地生物多样性与生态系统功能 学位论文 OAI收割
博士, 北京: 中国科学院研究生院, 2015
作者: 朱火星

收藏 | 浏览/下载：41/0 | 提交时间：2016/08/16

群落构建，生物多样性-生态系统功能，植物功能性状，响应-影响框架，生境过滤。生态位分化，生物量比假设，多样性假设, community assembly, biodiversity-ecosystem functioning, trait-based approach, habitat filtering, niche differentiation, response-effect framework

All-solid-state high beam quality 1053nm nd: Glass amplifier at repetition frequency (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Optical, Electronic Materials and Applications 2012, OEMA 2012, May 25, 2012 - May 26, 2012, Chongqing, China
作者: Qiu J.; Yu J.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

A laser amplifier of LD pumping Nd: glass with a high beam quality and stability which amplifies nanosecond laser pulse has been developed in this paper. The device adopts the major technology of "LD pumping multi pass amplification together". Beam transmission is designed with the technology of "inhibition of diffraction effect active control and spatial filtering". (2012) Trans Tech Publications Switzerland.

Adaptive Wiener filtering with Gaussian fitted point spread function in image restoration (EI CONFERENCE) 会议论文 OAI收割
2011 IEEE 2nd International Conference on Software Engineering and Service Science, ICSESS 2011, July 15, 2011 - July 17, 2011, Beijing, China
作者: Yang L.; Zhang X.; Zhang X.; Zhang X.; Yang L.

收藏 | 浏览/下载：44/0 | 提交时间：2013/03/25

In the imaging process of the space remote sensing camera there was degradation phenomenon in the acquired images. In order to reduce the image blur caused by the degradation the remote sensing images were restored to give prominence to the characteristic objects in the images. First the frequency-domain notch filter was adopted to remove strip noises in the images. Then using the ground characters with the knife-edge shape in the images the point spread function of the imaging system was estimated. In order to improve the accuracy the estimated point spread function was corrected with Gaussian fitting method. Finally the images were restored using the adaptive Wiener filtering with the fitted point spread function. Experimental results of the real remote sensing images showed that almost all strip noises in the images were eliminated. After the denoised images were restored its variance and its gray mean gradient increased also its laplacian gradient increased. Restoration with Gaussian fitted point spread function is beneficial to interpreting and analyzing the remote sensing images. After restoration the blur phenomenon of the images is reduced. The characters are highlighted and the visual effect of the images is clearer. 2011 IEEE.

Research on image restoration of Roll-Swing imaging seeker (EI CONFERENCE) 会议论文 OAI收割
3rd IEEE International Conference on Advanced Computer Control, ICACC 2011, January 18, 2011 - January 20, 2011, Harbin, China
作者: Zhang H.; Zhang H.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

To achieve a correct image receiving for Roll-Swing imaging seeker the mechanism and imaging process is analyzed. The causes of image rotation are discussed. The influence of the frame encoders' precision on imaging de-rotation quality is analyzed. The Roll-Swing imaging seeker is designed for high-speed aerocraft thus the received images are greatly degraded due to atmospheric turbulence. A new method of image restoration is proposed for turbulence-degraded images in this paper. The method is to get point spread function (PSF) based on the estimation of optical transfer function (OTF) according to the optical system design simulation. Finally to obtain the restored image constrained least squares filtering is used with the known PSF. The experiment results indicate that the new restoration method has a favorable effect to satisfy requirement of the automatic target recognition. 2011 IEEE.

Driving and image enhancement for CCD sensing image system (EI CONFERENCE) 会议论文 OAI收割
2010 3rd IEEE International Conference on Computer Science and Information Technology, ICCSIT 2010, July 9, 2010 - July 11, 2010, Chengdu, China
Zhang M.; Ren J.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

The paper designs a driving circuit of high sensitive wide dynamic for CCD sensing imaging system which adopts a Dalsa-made high resolution full-frame 33-mega pixels area CCD FTF5066M. Field Programmable Gate Array (FPGA) is used as the main device to accomplish the timing design of the circuits and power driver control of the sensor. By using the Correlated Double Sampling (CDS) technique the video noise is reduced and the SNR of the system is increased. The output rate of the imaging system designed with integrated chip can reach to 1.3 frames per second through bi-channel output. We use the histogram specification to adjust the brightness of the captured image. And then use the median filtering to suppress the noise. The traditional gray mean gradient (GMG) and the objective evaluation method based on Human Visual System (HVS) used to verify the effect of image enhancement. 2010 IEEE.

Restoration of moving blurred image based on TMS320C6416 (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu W.

收藏 | 浏览/下载：41/0 | 提交时间：2013/03/25

To absolve image blur caused by camera's high speed fixed-point DSP TMS320C6416 and wiener filtering algorithm are adopted to stabilize image. On the premise that cameras have uniform motion restoration model for moving blurred image was researched the principle of Wiener filtering is explained the key technologies of moving blurred image restoration with TMS320C6416 are introduced: how to complete FFT calculation of 32bit and how to exert DMA function of DSP to enhance processing speed ring effect and ghost effect in restored image are explained and how the parameter of wiener filter affects ring effect and ghost effect is discussed in addition to this other reasons of ring effect and ghost effect are analyzed detailed. Experiments shows that One TMS320C6416 chip can restore seven frames per second there is great hope to realize real-time restoration if adopting multi-DSP or the FFT completion by hardware.

Realization of electron image stabilization based on TMS320C6416 (EI CONFERENCE) 会议论文 OAI收割
Proceedings of the Sixth IEEE CPMT Conference on High Density Microsystem Design and Packaging and Component Failure Analysis, HDP'04, June 30, 2004 - July 3, 2004, Shanghai, China
作者: Yao Z.-J.; Liu W.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

To absolve image blur of high speed camera ringing effect and edge effect are analyzed fixed-point DSP TMS320C6416 and wiener filtering algorithm are adopted. Degeneration model for moving blur is researched the principle of Wiener filtering is explained: how complete FFT of 32bit and how to exert DMA function of DSP to enhance processing speed and the test results are presented. 2004 IEEE.