中国科学院机构知识库网格系统: 检索

Orthogonal Doppler Frequency Modulation Over Doubly Selective Channels 期刊论文 OAI收割
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 2026, 卷号: 25, 页码: 7458-7475
作者: Zhang, Chong; Yuan, Jinhong; Zhou, Yiqing; Shi, Jinglin

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收藏 | 浏览/下载：1/0 | 提交时间：2026/05/25

Time-frequency analysis Doppler effect Delays OFDM modulation Wireless communication Symbols Frequency modulation Time-domain analysis Discrete Fourier transforms Signal resolution ODFM OFDM OTFS/ODDM multi-carrier modulation doubly selective channel 5G PDSCH

Image Retargetability 期刊论文 OAI收割
IEEE TRANSACTIONS ON MULTIMEDIA, 2020, 卷号: 22, 期号: 3, 页码: 641-654
作者: Tang, Fan; Dong, Weiming; Meng, Yiping; Ma, Chongyang; Wu, Fuzhang

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收藏 | 浏览/下载：76/0 | 提交时间：2020/06/02

Visualization Task analysis Distortion Measurement Image resolution Convolutional neural networks Semantics Image retargetability visual attributes multi-task learning deep convolutional neural network

城市空间格局多源遥感协同提取与特征分析 学位论文 OAI收割
北京: 中国科学院大学, 2019
作者: 李治

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收藏 | 浏览/下载：92/0 | 提交时间：2021/12/10

高空间分辨率遥感多源空间信息协同多特征提取城市空间格局分析 High-spatial-resolution Remote Sensing Multi-source Spatial Information Collaboration Multi-feature Extraction Urban Spatial Pattern Analysis

Quantitative analysis of vascular parameters for micro-CT imaging of vascular networks with multi-resolution 期刊论文 OAI收割
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 2016, 卷号: 54, 期号: 2-3, 页码: 511-524
作者: Zhao, Fengjun; Liang, Jimin; Chen, Xueli; Liu, Junting; Chen, Dongmei

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收藏 | 浏览/下载：65/0 | 提交时间：2016/10/20

Micro-computed Tomography Multi-resolution Quantitative Analysis Vascular Networks

A line mapping based automatic registration algorithm of infrared and visible images 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: Ai R(艾锐); Shi ZL(史泽林); Xu DJ(徐德江); Zhang CS(张程硕)

收藏 | 浏览/下载：72/0 | 提交时间：2013/12/26

There exist complex gray mapping relationships among infrared and visible images because of the different imaging mechanisms. The difficulty of infrared and visible image registration is to find a reasonable similarity definition. In this paper, we develop a novel image similarity called implicit linesegment similarity(ILS) and a registration algorithm of infrared and visible images based on ILS. Essentially, the algorithm achieves image registration by aligning the corresponding line segment features in two images. First, we extract line segment features and record their coordinate positions in one of the images, and map these line segments into the second image based on the geometric transformation model. Then we iteratively maximize the degree of similarity between the line segment features and correspondence regions in the second image to obtain the model parameters. The advantage of doing this is no need directly measuring the gray similarity between the two images. We adopt a multi-resolution analysis method to calculate the model parameters from coarse to fine on Gaussian scale space. The geometric transformation parameters are finally obtained by the improved Powell algorithm. Comparative experiments demonstrate that the proposed algorithm can effectively achieve the automatic registration for infrared and visible images, and under considerable accuracy it makes a more significant improvement on computational efficiency and anti-noise ability than previously proposed algorithms.

Improvement of urban land use and land cover classification approach in arid areas 会议论文 OAI收割
Proceedings of SPIE - The International Society for Optical Engineering, Image and Signal Processing for Remote Sensing XVI, Toulouse, France, 2010
Qian; Jing1; 2; Zhou; Qiming1; Chen; Xi2

收藏 | 浏览/下载：62/0 | 提交时间：2011/08/23

Arid regions - Image analysis - Image classification - Land use - Landforms - Maximum likelihood - Photography - Pixels - Remote sensing - Signal processing - Aerial Photographs - Arid area - Bare soils - Beijing-1 - Built-up areas - Classification approach - Classification results - Construction materials - Data sets - Discrete elements - Extraction accuracy - Field investigation - High resolution image - Land-cover types - Landsat ETM - Maximum likelihood classifications - Mixed pixel - Multi-sensor data - Object oriented - object-oriented classification method - Object-oriented processing - Spectral characteristics - Stony deserts - Urban areas - Urban change detection - Urban environments - Urban land use

Multi-scale digital terrain analysis and feature selection for digital soil mapping SCI/SSCI论文 OAI收割
2010
Behrens T.; Zhu A. X.; Schmidt K.; Scholten T.

收藏 | 浏览/下载：47/0 | 提交时间：2012/06/08

Multi-scale digital terrain analysis Feature selection Spatial data mining Digital soil mapping ANOVA Principal components analysis Random subsets Decision trees scale-dependent correlation random subspace method dem resolution fuzzy-logic map scale model landscapes areas silty size

Design of high-resolution fourier transform lens (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhang L.; Zhang L.

收藏 | 浏览/下载：59/0 | 提交时间：2013/03/25

With the development of optical information processing high-resolution Fourier transform lens has often been used in holographic data storage system spatial filtering and observation of particles. This paper studies the optical design method of high-resolution Fourier transform optical lenses system which could be used in particles observation and holographic data storage system. According to Fourier transform relation between object and its frequency plane and the theory of geometrical optics the system with working wavelength 532nm and resolution 3 m was designed based on ZEMAX. A multi-configuration method was adopted to optimize the system's lenses. In the optical system a diaphragm was placed at the system's spectrum plane and the system demanded a low vacuum to cut down the influences of atmosphere and other particles. The result of finite element analysis indicated that the influences of vacuum pumping to optics spacing and mirror surface shape very minor and the imaging quality not being affected. This system has many advantages such as simple structure good image quality and a high resolution of 3 m. So it has a wide application prospect and can be used both in holographic data storage system and particles observation.

Extraction of residential information from high-spatial resolution image integrated with upscaling methods and object multi-features - art. no. 678605 会议论文 OAI收割
Mippr 2007: Automatic Target Recognition and Image Analysis; and Multispectral Image Acquisition, Pts 1 and 2, Bellingham
Dong, Lixin; Wu, Bingfang

收藏 | 浏览/下载：32/0 | 提交时间：2014/12/07

upscaling methods object multi-features semi-variance analysis multi-resolution residential area TEXTURE METRICS SCALE SAR

多普勒分集和小波接收机 学位论文 OAI收割
工学博士, 中国科学院自动化研究所: 中国科学院研究生院, 2006
作者: 石广建

收藏 | 浏览/下载：49/0 | 提交时间：2015/09/02

双选择性信道多径分集多普勒分集小波分析小波接收机 doubly-selective channel multi-path diversity Doppler diversity Multi-resolution Analysis (MRA) framework wavelet receiver