中国科学院机构知识库网格系统: 检索

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	Integrating land surface conditions and transport networks to quantify the spatial accessibility of cities in China 期刊论文 OAI收割 JOURNAL OF MAPS, 2019, 页码: 7 作者: Chen, Wei; Liu, Weidong; Liu, Zhigao \| 收藏 \| 浏览/下载：137/0 \| 提交时间：2020/05/19 Accessibility travel time cost distance spatial structure China
	Integrating land surface conditions and transport networks to quantify the spatial accessibility of cities in China 期刊论文 OAI收割 JOURNAL OF MAPS, 2019, 页码: 7 作者: Chen, Wei; Liu, Weidong; Liu, Zhigao \| 收藏 \| 浏览/下载：19/0 \| 提交时间：2020/05/19 Accessibility travel time cost distance spatial structure China
	The dynamics of landscape-scale ecological connectivity based on least-cost model in Dongshan Island, China 期刊论文 OAI收割 Journal of Mountain Science, 2017, 卷号: 14, 期号: 2, 页码: 336-345 作者: WU Li-yun; HE Dong-jin; YOU Wei-bin; JI Zhi-rong; TAN Yong \| 收藏 \| 浏览/下载：15/0 \| 提交时间：2017/02/27 Cost-distance Model Dongshan Island Ecological Connectivity Spatio-temporal Dynamics
	A shape context based Hausdorff similarity measure in image matching 会议论文 OAI收割 5th International Symposium on Photoelectronic Detection and Imaging (ISPDI) - Infrared Imaging and Applications, Beijing, June 25-27, 2013 作者: Ma TL(马天磊); Liu YP(刘云鹏); Shi ZL(史泽林); Yin J(尹健) 收藏 \| 浏览/下载：36/0 \| 提交时间：2013/12/26 The traditional Hausdorff measure, which uses Euclidean distance metric (L2 norm) to define the distance between coordinates of any two points, has poor performance in the presence of the rotation and scale change although it is robust to the noise and occlusion. To address the problem, we define a novel similarity function including two parts in this paper. The first part is Hausdorff distance between shapes which is calculated by exploiting shape context that is rotation and scale invariant as the distance metric. The second part is the cost of matching between centroids. Unlike the traditional method, we use the centroid as reference point to obtain its shape context that embodies global information of the shape. Experiment results demonstrate that the function value between shapes is rotation and scale invariant and the matching accuracy of our algorithm is higher than that of previously proposed algorithm on the MEPG-7 database.
	The design of high speed image acquisition system over Gigabit Ethernet (EI CONFERENCE) 会议论文 OAI收割 2010 IEEE International Conference on Wireless Communications, Networking and Information Security, WCNIS 2010, June 25, 2010 - June 27, 2010, Beijing, China 作者: Zhang W.; He X.; Zhang W. 收藏 \| 浏览/下载：36/0 \| 提交时间：2013/03/25 The applications based on traditional digital cameras have been limited by distance cost and networking. Gigabit Ethernet is a data transmission standard based on the IEEE 802.3 protocol brings several benefits to image transmission. In this paper we compare the main features of Gigabit Ethernet and traditional digital camera interfaces. And we design a high speed image acquisition system which overcomes these application limitations by allowing cameras to send imaging data over Gigabit Ethernet. In this system we design a highly efficient bidirectional conversion device based on FPGA converts imaging data from a camera to IP packets based on UDP protocol and sends it to PCs over inexpensive Cat-5 copper LAN cable. At the PC the Cat-5 cable plugs into a standard Gigabit Ethernet NIC(network interface card) eliminating the need for a frame grabber. An communications application software is used to acquire the network data construct and display the image. A simple and efficient acknowledge and resend mechanism was used to guarantee packet delivery. The system architecture and the communication protocol are discussed in details the experiment and results are presented in this paper. 2010 IEEE.
	Optimal multiresolution dynamic models generation based on triangle importance (EI CONFERENCE) 会议论文 OAI收割 2nd International Conference on Image Analysis and Signal Processing, IASP'2010, April 12, 2010 - April 14, 2010, Xiamen, China 作者: Zhao J.; Zhang S. 收藏 \| 浏览/下载：20/0 \| 提交时间：2013/03/25 In this paper we propose an efficient method to generate optimal multiresolution dynamic models. By the method we define the triangle importance degree as a weight parameter to be embedded to the edge contraction cost so the new metric can not only measure distance error but also reflect geometric variation of local areas. A deformation degree weight is appended to the aggregated edge contraction cost for the whole animation thus sharp features on areas with large deformation can be preserved. In addition a process of mesh optimization and validity check can further alleviate the geometric distortion of the approximations. Our approach is efficient in operation easy for implementation and as a result high quality of dynamic approximations with well-preserved fine details can be generated at any given frame. 2010 IEEE.
	Ecologically based landscape pattern optimization in northwest of Beijing 期刊论文 OAI收割 JOURNAL OF GEOGRAPHICAL SCIENCES, 2009, 卷号: 19, 期号: 3, 页码: 359-372 Yue Depeng; Wang Jiping; Liu Yongbing; Zhang Xiaoli; Li Hailong; Wang Jie 收藏 \| 浏览/下载：21/0 \| 提交时间：2015/08/07 accumulative cost distance model landscape pattern optimization Beijing
	Multiresolution animated models generation based on deformation distance analysis (EI CONFERENCE) 会议论文 OAI收割 2009 International Conference on Computer Modeling and Simulation, ICCMS 2009, February 20, 2009 - February 22, 2009, Macau, China Shixue Z.; Enhua W. 收藏 \| 浏览/下载：61/0 \| 提交时间：2013/03/25 In computer graphics animated models have been widely used to represent time-varying data. Reducing the models complexly is a common way to overcome the rendering limitations. In this paper 2009 IEEE. we propose an efficient method for generating multiresolution animated models based on deformation distance analysis. Our method obtains different LOD models by performing iterative edge contraction operations. We use deformation distance to analysis the deformation degree of the triangle planes during the whole animation and define a deformation weight to be added to the aggregated edge contraction cost. Thus features in areas with large deformation can be preserved well. Besides we propose a mesh optimization method for dynamic model sequence which can efficiently improve the temporal coherence and reduce visual artifacts between adjacent frames. The results show our approach is efficient easy to implement and good quality animated approximations with well-preserved fine details can be generated at any given frame. copy
	Research and Improvement on Optimal Path Analysis Algorithm Based on Cost-Distance Grid 会议论文 OAI收割 Zhang X.; Cao G. F.; Zhang L. L.; Ieee 收藏 \| 浏览/下载：25/0 \| 提交时间：2012/06/30 optimal path Analysis cost-distance grid direction grid accumulative cost distance