中国科学院机构知识库网格系统: 检索

Localized Downscaling of Urban Land Surface Temperature-A Case Study in Beijing, China 期刊论文 OAI收割
REMOTE SENSING, 2022, 卷号: 14, 期号: 10, 页码: 16
作者: Li, Nana; Wu, Hua; Ouyang, Xiaoying

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收藏 | 浏览/下载：27/0 | 提交时间：2022/09/21

urban land surface temperature downscaling random forest building morphology optimal local-window size stepwise downscaling Beijing area

Localization or Globalization? Determination of the Optimal Regression Window for Disaggregation of Land Surface Temperature 期刊论文 OAI收割
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2017, 卷号: 55, 期号: 1, 页码: 477-490
作者: Gao, Lun; Zhan, Wenfeng; Huang, Fan; Quan, Jinling; Lu, Xiaoman

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收藏 | 浏览/下载：37/0 | 提交时间：2019/09/26

Disaggregation global regression strategy (GWS) land surface temperature (LST) local regression strategy (LWS) moving-window size (MWS) thermal remote sensing

Comparison of different “window-size” key phrase co-occurrence in Bibliometrics 会议论文 OAI收割
6th Annual Global TechMining Conference &21st International Conference on Science And Technology Indicators, Spain，Valencia Spain, 2016年9月13日-2016年9月16日
作者: Liu JH(刘建华); Alan Porter; Zhixiong Zhang; HongBo Shi; Li Qian

收藏 | 浏览/下载：32/0 | 提交时间：2017/06/27

co-occurrence matrix key phrase co-occurrence window size knowledge representation

Noncircularity Parameters and Their Potential Applications in UHR MMW SAR Data Sets 期刊论文 OAI收割
IEEE Geoscience and Remote Sensing Letters, 2016, 卷号: 13, 期号: 10, 页码: 1547-1551
作者: Wu, Wenjin; Li, Xinwu; Guo, Huadong; Ferro-Famil, Laurent; Zhang, Lu

收藏 | 浏览/下载：25/0 | 提交时间：2017/04/24

VARIABLE WINDOW SIZE CROWN DELINEATION ESTIMATING BIOMASS LIDAR DATA FOREST HEIGHT COMPONENTS INVENTORY MODELS SYSTEM

Neighborhood size and spatial scale in raster-based slope calculations SCI/SSCI论文 OAI收割
2012
Gao J.; Burt J. E.; Zhu A. X.

收藏 | 浏览/下载：26/0 | 提交时间：2014/12/25

neighborhood size spatial scale window size slope terrain analysis models

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.

Estimation algorithm of mobile OFDM CFOs based on step-size (EI CONFERENCE) 会议论文 OAI收割
2009 International Conference on Information Engineering and Computer Science, ICIECS 2009, December 19, 2009 - December 20, 2009, Wuhan, China
Lin L.; Qiao Y.-F.; Su W.-X.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

In order to maintain orthogonality among subcarriers for mobile OFDM a CFOs step-size estimation model is established to avoid severe performance degradation caused by ICI and algorithmic stability step-size parameter the error of CFOs estimate and etc are investigated. First after an averaging window algorithm is introduced the mathematic model of step-size estimation algorithm is obtained through step-size parameter and time-varying CFOs. Then based on the results of MATLAB simulation the determination of step-size parameter the advantages of step-size algorithm and precision are discussed. Finally time sequence plots of added CP interleaver and subcarrier modulation with VHDL are presented. Experimental results indicate that the maximum of CFOs errors is 0.00987 in 3 variance interval when mobile velocity is 400 km/h according with verdicted principle that in order for the ICI effects to be negligible the error of CFOs estimation must be accurate within 1-2% of the subcarrier spacing and programs can correctly implement on circuit board. 2009 IEEE.

DERIVATION OF GLACIER VELOCITY FROM SAR AND OPTICAL DATA WITH FEATURE TRACKING 会议论文 OAI收割
2009 Ieee International Geoscience and Remote Sensing Symposium, Vols 1-5, New York
Huang, Lei; Li, Zhen

收藏 | 浏览/下载：21/0 | 提交时间：2014/12/07

Glacier velocity featuring tracking window size cross correlation ALOS IMAGERY

Study on the fabrication of orange micro-LED arrays for display (EI CONFERENCE) 会议论文 OAI收割
ICO20: Display Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China
作者: Li J.; Wang W.; Wang W.; Zhao L.; Li J.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

Arrays of micro-sized LEDs which can be used as microdisplays have been demonstrated in recent years. In order to reduce the input and output connections to the arrays we employ a matrix addressable architecture in which all the pixels in each row are connected by a common metal line on the top of the window layer (top electrode) or at the base of substrate(bottom electrode). Decreasing the size of electrodes makes for minimizing the size of device. The optic and electric isolation and good ohmic contact are also helpful to obtain superior optical and electrical performance. We describe a procedure of fabrication of AlGalnP-based orange micro-LED by wet etching. The structure of devices is etched using both isotropic and anisotropic etchant. The pixel size is about 16um 20um and there are 1000 818 pixels in the light emitting chip whose diagonal is 1-in.

High-accuracy real-time automatic thresholding for centroid tracker (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Zhang Y.

收藏 | 浏览/下载：38/0 | 提交时间：2013/03/25

Many of the video image trackers today use the centroid as the tracking point. In engineering we can get several key pairs of peaks which can include the target and the background around it and use the method of Otsu to get intensity thresholds from them. According to the thresholds it give a great help for us to get a glancing size a target's centroid is computed from a binary image to reduce the processing time. Hence thresholding of gray level image to binary image is a decisive step in centroid tracking. How to choose the feat thresholds in clutter is still an intractability problem unsolved today. This paper introduces a high-accuracy real-time automatic thresholding method for centroid tracker. It works well for variety types of target tracking in clutter. The core of this method is to get the entire information contained in the histogram we can gain the binary image and get the centroid from it. To track the target so that we can compare the size of the object in the current frame with the former. If the change is little such as the number of the peaks the paper also suggests subjoining an eyeshot-window we consider the object has been tracked well. Otherwise their height just like our eyes focus on a target if the change is bigger than usual position and other properties in the histogram. Combine with this histogram analysis we will not miss it unless it is out of our eyeshot we should analyze the inflection in the histogram to find out what happened to the object. In general the impression will help us to extract the target in clutter and track it and we will wait its emergence since it has been covered. To obtain the impression what we have to do is turning the analysis into codes for the tracker to determine a feat threshold. The paper will show the steps in detail. The paper also discusses the hardware architecture which can meet the speed requirement. the paper offers a idea comes from the method of Snakes