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New construction of codebooks based on the singular linear spaces over finite fields 认领 引用
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作者 LIU Xuemei ZONG Mengting +1 位作者 SHI Tong JIA Lihua 《纯粹数学与应用数学》 2025年第3期508-520,共13页
Codebooks are widely applied in code division multiple access communication systems.Based on the subspaces of singular linear spaces over the finite fields,two classes of new codebooks are constructed.Firstly,a kind o... Codebooks are widely applied in code division multiple access communication systems.Based on the subspaces of singular linear spaces over the finite fields,two classes of new codebooks are constructed.Firstly,a kind of binary codebooks are constructed by using the subspace of the singular linear space over the finite fields.According to the anzahl theorem,the parameters and the maximum correlation amplitude Imax(C)of the codebooks are calculated,and then given the conditions that the Imax(C)asymptotically reaches the Welch bound.On this basis,by mixing with Hadamard matrices,the number of columns are increased and obtain another class of new code,which further relaxes the conditions that the Imax(C)asymptotically reaches the Welch bound. 展开更多
关键词 codebooks singular linear spaces Welch bound Hadamard matrix
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A Review of Codebooks for CSI Feedback in 5G New Radio and Beyond 认领 引用
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作者 Qin Ziao Yin Haifan 《China Communications》 SCIE EI CSCD 2025年第2期112-127,共16页
Codebooks have been indispensable for wireless communication standard since the first release of the Long-Term Evolution in 2009.They offer an efficient way to acquire the channel state information(CSI)for multiple an... Codebooks have been indispensable for wireless communication standard since the first release of the Long-Term Evolution in 2009.They offer an efficient way to acquire the channel state information(CSI)for multiple antenna systems.Nowadays,a codebook is not limited to a set of pre-defined precoders,it refers to a CSI feedback framework,which is more and more sophisticated.In this paper,we review the codebooks in 5G New Radio(NR)standards.The codebook timeline and the evolution trend are shown.Each codebook is elaborated with its motivation,the corresponding feedback mechanism,and the format of the precoding matrix indicator.Some insights are given to help grasp the underlying reasons and intuitions of these codebooks.Finally,we point out some unresolved challenges of the codebooks for future evolution of the standards.In general,this paper provides a comprehensive review of the codebooks in 5G NR and aims to help researchers understand the CSI feedback schemes from a standard and industrial perspective. 展开更多
关键词 codebook CSI 5G NR frequency division duplex Multiple-Input Multiple-Output
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Angle-Based Beamforming in mmWave Massive MIMO Systems with Low Feedback Overhead Using Multi-Pattern Codebooks 认领 引用 被引量：1
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作者 Yuyan Zhao Yanan Liu +2 位作者 Gary Boudreau Akram Bin Sediq Xianbin Wang 《China Communications》 SCIE CSCD 2019年第9期18-30,共13页
The integration of millimeter-wave(mmWave)communications and massive multiple input multiple output(MIMO)techniques is a promising solution to dramatically increase the 5G network throughput.By using large antenna arr... The integration of millimeter-wave(mmWave)communications and massive multiple input multiple output(MIMO)techniques is a promising solution to dramatically increase the 5G network throughput.By using large antenna arrays,beamforming can be adopted to improve the 5G capacity by employing spatial domain resources.In a frequency division duplexing(FDD)based 5G mmWave MIMO system,beamforming operation requires timely downlink channel state information(CSI)feedback.However,the rapid channel variations caused by short wavelength of mmWave band,and the high-level feedback information required due to the large number of antennas in massive MIMO system lead to the significantly increased beamforming overhead.In this paper,by exploiting the higher angular stability of such channels,we propose an angle-based beamforming scheme to reduce the feedback frequency and the number of feedback bits.To facilitate this approach users are initially selected to reduce the intra-zone interference before beamforming.Besides,location related feedback,which is not affected by the number of antennas,is adopted to reduce overhead.The simulation results show that two proposed user selection algorithms can adapt to scenarios with diverse requirements,while the feedback overhead of proposed angle-based beamforming algorithm is sharply reduce compared with that of CSIbased beamforming algorithm. 展开更多
关键词 angle-based beamforming codebook feedback reduction user selection
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Towards an Efficient Hierarchical Codebooks for Content-Based Images Retrieval 认领 引用 被引量：1
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作者 Z.Elleuch K.Marzouki 《Journal of Electronic Science and Technology》 CAS 2014年第1期107-111,共5页
In space feature quantization, the most important problem is designing an efficient and compact codebook. The hierarchical clustering approach successfully solves the problem of quantifying the feature space in a larg... In space feature quantization, the most important problem is designing an efficient and compact codebook. The hierarchical clustering approach successfully solves the problem of quantifying the feature space in a large vocabulary size. In this paper we propose to use a tree structure of hierarchical self-organizing-map （H-SOM） with the depth length equal to two and a high size of branch factors （50, 100, 200, 400, and 500）. Moreover, an incremental learning process of H-SOM is used to overcome the problem of the curse of the dimensionafity of space. The method is evaluated on three public datasets. Results exceed the current state-of-art retrieval performance on Kentucky and Oxford5k dataset. However, it is with less performance on the Holidays dataset. The experiment results indicate that the proposed tree structure shows significant improvement with a large number of branch factors. 展开更多
关键词 Codebook content-based imageretrieval incremental learning self-organizing-map.
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Designing Hierarchical Codebooks with Weighted Hamming Distance for Robust UWB Multi-Service Indication 认领 引用
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作者 Zhifan Ye Yapeng Gao Liuguo Yin 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2026年第2期1248-1262,共15页
The rising demand for diverse service requirements under limited resources necessitates designing codeword indicators with variable distance metrics to exploit prior information,such as data rate,coding schemes,and Si... The rising demand for diverse service requirements under limited resources necessitates designing codeword indicators with variable distance metrics to exploit prior information,such as data rate,coding schemes,and Signal-to-Noise Ratio(SNR).Traditional codebook designs that maximize the minimum Hamming distance provide a global lower bound but often overlook the specific distance requirements of individual codewords.To address this limitation,the weighted Hamming distance metric is introduced,prioritizing codewords with varying distance attributes.Maximizing the weighted Hamming distance leads to the development of hierarchical codebooks,enabling the selection of codewords tailored to specific distance needs.Building on the classical Plotkin bound,an upper bound is derived,revealing trade-offs among the number of codewords,distance layers,and lengths.Optimal hierarchical codebooks are designed using a cyclotomy structure to maintain the desired Hamming distance properties and incorporate a heuristic algorithm to allow flexibility in codebook length and multi-layer attributes.In ultra-wideband multi-service scenarios,allocating higher-distance codewords to lower-SNR services enhances overall performance by matching codeword distances to service demands.Simulations demonstrate that,informed by deep learning-based SNR predictions,this approach reduces packet error rates and improves efficiency compared to existing IEEE 802.15.4z convolutional schemes and classical Hadamard codebooks. 展开更多
关键词 multi-service weighted hamming distance data indication hierarchical codebook IEEE 802.15.4z
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A Novel Progressive Edge Growth-Based Codebook Design for SCMA Systems 认领 引用
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作者 Lei Tuofeng Ni Shuyan +2 位作者 Luo Qu Chen Shimiao Xiao Pei 《China Communications》 SCIE EI CSCD 2025年第6期116-130,共15页
This paper proposes a class of novel progressive edge growth-based codebooks for downlink sparse code multiple access(SCMA)systems.In the first scheme,we propose to progressively design the codebooks of each resource ... This paper proposes a class of novel progressive edge growth-based codebooks for downlink sparse code multiple access(SCMA)systems.In the first scheme,we propose to progressively design the codebooks of each resource node(RN)instead of rotating a mother constellation(MC)as in the conventional SCMA works.In the other one,based on the MC,a multi-resources rotated codebooks are proposed to improve the performance of the superimposed constellations.The resultant codebooks are respectively referred to as the resource edge multidimensional codebooks(REMC)and the user edge multi-dimensional codebooks(UEMC).Additionally,we delve into the detailed design of the MC and the superimposed constellation.Then,we pay special attention to the application of the proposed schemes to challenging design cases,particularly for the high dimensional,high rate,and irregular codebooks,where the corresponding simplified schemes are proposed to reduce the complexity of codebook design.Finally,simulation results are presented to demonstrate the superiority of our progressive edge growth-based schemes.The numerical results indicate that the proposed codebooks significantly outperform the stateof-the-art codebooks.In addition,we also show that the proposed REMC codebooks outperform in the lower signal-to-noise ratio(SNR)regime,whereas the UEMC codebooks exhibit better performance at higher SNRs. 展开更多
关键词 codebook design resource edge multidimensional codebooks(REMC) sparse code multiple access(SCMA) symbol error performance user edge multi-dimensional codebooks(UEMC)
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Low-Complexity Codebook Design for SCMA-Assisted Indoor Visible Light Communication Systems 认领 引用
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作者 Wang Yuhao Xu Chuan +3 位作者 Yu Lisu Lyu Xinxin Chen Junyuan Wang Zhenghai 《China Communications》 SCIE EI CSCD 2025年第6期180-192,共13页
Sparse code multiple access(SCMA)is a non-orthogonal multiple access(NOMA)scheme based on joint modulation and spread spectrum coding.It is ideal for future communication networks with a massive number of nodes due to... Sparse code multiple access(SCMA)is a non-orthogonal multiple access(NOMA)scheme based on joint modulation and spread spectrum coding.It is ideal for future communication networks with a massive number of nodes due to its ability to handle user overload.Introducing SCMA into visible light communication(VLC)systems can improve the data transmission capability of the system.However,designing a suitable codebook becomes a challenging problem when addressing the demands of massive connectivity scenarios.Therefore,this paper proposes a low-complexity design method for high-overload codebooks based on the minimum bit error rate(BER)criterion.Firstly,this paper constructs a new codebook with parameters based on the symmetric mother codebook structure by allocating the codeword power so that the power of each user codebook is unbalanced;then,the BER performance in the visible light communication system is optimized to obtain specific parameters;finally,the successive interference cancellation(SIC)detection algorithm is used at the receiver side.Simulation results show that the method proposed in this paper can converge quickly by utilizing a relatively small number of detection iterations.This can simultaneously reduce the complexity of design and detection,outperforming existing design methods for massive SCMA codebooks. 展开更多
关键词 high overload low-complexity codebook design sparse code multiple access(SCMA) successive interference cancellation(SIC) visible light communication(VLC)
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Multiuser transmission scheme in millimeter-wave systems assisted by an RIS subarray 认领 引用
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作者 AI Junjie CHEN Weicong +3 位作者 LIU Jia CAI Xuefeng TANG Wankai JIN Shi 《Journal of Southeast University(English Edition)》 EI CAS 2025年第2期140-146,共7页
The deployment of reconfigurable intelligent surfaces(RISs)can enhance the coverage ability of millimeter wave(mmWave)communication systems.However,the typical strong line-of-sight(LoS)far-field propagation between a ... The deployment of reconfigurable intelligent surfaces(RISs)can enhance the coverage ability of millimeter wave(mmWave)communication systems.However,the typical strong line-of-sight(LoS)far-field propagation between a base station(BS)and an RIS reduces channel rank,thus affecting multiuser spatial multiplexing.To address this issue,we propose an RIS subarray-assisted mmWave mul-tiuser transmission scheme.To increase channel rank,RIS is divided into multiple subarrays with adjustable spacing,and the channel is modeled using a hybrid spherical-and planar-wave model.To minimize interuser interference,the RIS subarrays are deployed in the discrete Fourier transform(DFT)direction of the BS antenna array.To maximize signal efficiency,the BS precoder,the RIS reflection coefficients,and the user’s combiner are jointly designed.Numerical simulations were conducted to verify the effectiveness of the proposed RIS subarray deployment strategy and the performance of the wireless transmission scheme.In a four-user equipment(UE)communication scenario in the mmWave band,the effective rank of the BS-RIS channel approaches full rank,and the spectral efficiency of each UE is improved by at least 3 bit/(s·Hz). 展开更多
关键词 millimeter waves reconfigurable intelligent surface(RIS) discrete Fourier transform(DFT)codebook wireless communications
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Codebook Design and Beam Training for Extremely Large-Scale RIS:Far-Field or Near-Field? 认领 引用 被引量：27
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作者 Xiuhong Wei Linglong Dai +2 位作者 Yajun Zhao Guanghui Yu Xiangyang Duan 《China Communications》 SCIE CSCD 2022年第6期193-204,共12页
Reconfigurable intelligent surface(RIS)is more likely to develop into extremely large-scale RIS(XL-RIS)to efficiently boost the system capacity for future 6 G communications.Beam training is an effective way to acquir... Reconfigurable intelligent surface(RIS)is more likely to develop into extremely large-scale RIS(XL-RIS)to efficiently boost the system capacity for future 6 G communications.Beam training is an effective way to acquire channel state information(CSI)for XL-RIS.Existing beam training schemes rely on the far-field codebook.However,due to the large aperture of XL-RIS,the scatters are more likely to be in the near-field region of XL-RIS.The far-field codebook mismatches the near-field channel model.Thus,the existing far-field beam training scheme will cause severe performance loss in the XL-RIS assisted nearfield communications.To solve this problem,we propose the efficient near-field beam training schemes by designing the near-field codebook to match the nearfield channel model.Specifically,we firstly design the near-field codebook by considering the near-field cascaded array steering vector of XL-RIS.Then,the optimal codeword for XL-RIS is obtained by the exhausted training procedure.To reduce the beam training overhead,we further design a hierarchical nearfield codebook and propose the corresponding hierarchical near-field beam training scheme,where different levels of sub-codebooks are searched in turn with reduced codebook size.Simulation results show the proposed near-field beam training schemes outperform the existing far-field beam training scheme. 展开更多
关键词 extremely large-scale RIS near-field codebook design beam training
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一种基于主成分分析的Codebook背景建模算法 认领 引用 被引量：18
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作者 霍东海 杨丹 +1 位作者 张小洪 洪明坚 《自动化学报》 EI CAS CSCD 北大核心 2012年第4期591-600,共10页
混合高斯(Mixture of Gaussian,MOG)背景建模算法和Codebook背景建模算法被广泛应用于监控视频的运动目标检测问题,但混合高斯的球体模型通常假设RGB三个分量是独立的,Codebook的圆柱体模型假设背景像素值在圆柱体内均匀分布且背景亮度... 混合高斯(Mixture of Gaussian,MOG)背景建模算法和Codebook背景建模算法被广泛应用于监控视频的运动目标检测问题,但混合高斯的球体模型通常假设RGB三个分量是独立的,Codebook的圆柱体模型假设背景像素值在圆柱体内均匀分布且背景亮度值变化方向指向坐标原点,这些假设使得模型对背景的描述能力下降.本文提出了一种椭球体背景模型,该模型克服了混合高斯球体模型和Codebook圆柱体模型假设的局限性,同时利用主成分分析(Principal components analysis,PCA)方法来刻画椭球体背景模型,提出了一种基于主成分分析的Codebook背景建模算法.实验表明,本文算法不仅能够更准确地描述背景像素值在RGB空间中的分布特征,而且具有良好的鲁棒性. 展开更多
关键词 混合高斯模型 运动目标检测 Codebook算法 主成分分析
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一种改进的基于平均背景模型的运动目标检测算法 认领 引用 被引量：10
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作者 叶锋 范曼曼 +1 位作者 郑子华 尹鹏 《福建师范大学学报（自然科学版）》 CAS CSCD 北大核心 2011年第4期44-49,共6页
通过实验仿真分析探讨了基于背景差分法的两种运动目标检测算法(平均背景模型法和codebook模型法)的性能和存在问题,并在此基础上提出了一种改进的平均背景模型的算法.算法采用当前图像与背景相减后差分图像的灰度直方图进行阈值的选取... 通过实验仿真分析探讨了基于背景差分法的两种运动目标检测算法(平均背景模型法和codebook模型法)的性能和存在问题,并在此基础上提出了一种改进的平均背景模型的算法.算法采用当前图像与背景相减后差分图像的灰度直方图进行阈值的选取,同时引进新的背景更新方法,由分割得到的前景图像来控制背景更新的区域.实验结果表明,改进后的算法在与原算法使用相同的初始帧数的基础上,目标检测的完整性和有效性均有所提高,且能够适应背景缓慢变化的场景. 展开更多
关键词 目标检测 平均背景模型 codebook模型 阈值提取
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A CSI Acquisition Approach for mm Wave Massive MIMO 认领 引用 被引量：3
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作者 Shanzhi Chen Qiubin Gao +3 位作者 Runhua Chen Hui Li Shaohui Sun Zhengxuan Liu 《China Communications》 SCIE CSCD 2019年第9期1-14,共14页
Massive Multiple-Input Multiple-Output(MIMO)is considered as a key technology for 4G and 5G wireless communication systems to improve spectrum efficiency by supporting large number of concurrent users.In addition,for ... Massive Multiple-Input Multiple-Output(MIMO)is considered as a key technology for 4G and 5G wireless communication systems to improve spectrum efficiency by supporting large number of concurrent users.In addition,for the target frequency band of 5G system,mmWave band,massive MIMO is pivotal in compensating the high pathloss.In this paper,we investigate the channel state information(CSI)acquisition problem for mmWave massive MIMO.With hybrid analog-digital antenna architecture,how to derive the analog beamforming and digital beamforming is studied.An iterative analog beam acquisition approach is proposed to save system overhead and reduce beam searching complexity.Regarding the digital beamforming,a grouping based codebook is proposed to facilitate CSI feedback.The codebook is then extended to incorporate also analog beam acquisition.Furthermore,channel reciprocity is exploited to save CSI reporting overhead and a two-stage approach is proposed to fully utilize the channel reciprocity at both mobile station and base station side and accelerate the CSI acquisition procedure. 展开更多
关键词 codebook CSI acquisition hybrid beamforming
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Two-Codebook-Based Cooperative Precoding for TDD-CoMP in 5G Ultra-Dense Networks 认领 引用 被引量：1
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作者 GAO Tengshuang CHEN Ying +1 位作者 HAO Peng ZHANG Hongtao 《ZTE Communications》 2018年第2期32-36,共5页
In ultra-dense networks （UDN）, the local precoding scheme for time-division duplex coordinated multiple point transmission （TDD-CoMP） can have a good performance with no feedback by using reciprocity between uplin... In ultra-dense networks （UDN）, the local precoding scheme for time-division duplex coordinated multiple point transmission （TDD-CoMP） can have a good performance with no feedback by using reciprocity between uplink and dovallink. However, if channel is time-varying, the channel difference would cause codeword mismatch between transmitter and receiver, which leads to performance degradation. In this paper, a linear interpolation method is proposed for TDD-CoMP system to estimate the uplink channel at the receiver, which would reduce the channel difference caused by time delay and decrease the probability of codeword mismatch between both sides. Moreover, to mitigate severe inter-cell interference and increase the coverage and throughput of celledge users in UDN, a two-codebook scheme is used to strengthen cooperation between base stations （BSs）, which can outperform the global precoding scheme with less overhead. Simulations show that the proposed scheme can significantly improve the link performance compared to the global precoding scheme. 展开更多
关键词 ultra-dense networks coordinated multiple point transmission time-division duplex two codebooks cooperative precoding
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A New Codebook Design Scheme for Fast Beam Searching in Millimeter-Wave Communications 认领 引用 被引量：1
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作者 ZOU Weixia GUO Chao +2 位作者 DU Guanglong WANG Zhenyu GAO Ying 《China Communications》 SCIE CSCD 2014年第6期12-22,共11页
To overcome imperfection of exhaustive based beam searching scheme in IEEE 802.15.3c and IEEE 802.11 ad and accelerate the beam training process, combined with the fast beam searching algorithm previously proposed, th... To overcome imperfection of exhaustive based beam searching scheme in IEEE 802.15.3c and IEEE 802.11 ad and accelerate the beam training process, combined with the fast beam searching algorithm previously proposed, this paper proposed a beam codebook design scheme for phased array to not only satisfy the fast beam searching algorithm's demand, but also make good use of the advantage of the searching algorithm. The simulation results prove that the proposed scheme not only performs well on flexibility and searching time complexity, but also has high success ratio. 展开更多
关键词 wireless communication 60GHz phased array beam-forming beam searching beam codebook design
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基于Codebook的视频火焰识别算法 认领 引用 被引量：4
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作者 邵良杉 郭雅婵 《计算机应用》 CSCD 北大核心 2015年第5期1483-1487,共5页
为了提高视频火焰识别的准确度,提出了一种基于Codebook的火焰识别方法,创新地在YUV空间使用Codebook背景模型检测火焰区域,定期更新背景,综合火焰的动静态多特征进行火焰识别。首先,提取视频中的每一帧图像,利用原始图像中R、G、B三个... 为了提高视频火焰识别的准确度,提出了一种基于Codebook的火焰识别方法,创新地在YUV空间使用Codebook背景模型检测火焰区域,定期更新背景,综合火焰的动静态多特征进行火焰识别。首先,提取视频中的每一帧图像,利用原始图像中R、G、B三个分量间存在的线性关系作为颜色模型,初步提取火焰颜色区域;然后,为了利用YUV颜色空间的有利特性,将颜色空间从RGB转化到YUV,使用Codebook背景模型进行背景学习、背景差分,提取出具有火焰颜色的动态前景;最后,利用火焰面积变化率、区域重叠率、质心位移这3个特征来训练反向传播(BP)神经网络,通过训练好的神经网络判断视频图像是否存在火焰。选取相机位置以及方向固定的视频进行实验,所提算法在复杂的视频场景中的识别准确度达到96%以上。实验结果表明,所提算法有效提高识别的准确度,同时降低多种干扰物场景的误判率。 展开更多
关键词 视频 火焰 YUV颜色空间 Codebook背景模型 反向传播神经网络
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结合背景更新和亮度范围的改进Codebook模型算法 认领 引用 被引量：2
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作者 瞿中 辛宁 廖春梅 《计算机应用与软件》 CSCD 2016年第11期153-156,共4页
传统的Codebook背景模型算法是在RGB颜色空间下建立的,该算法计算复杂、分割质量不高且抗扰动能力较差。首先利用YUV颜色空间下亮度与色度分离的特性,建立Codebook背景模型,其次针对背景模型的亮度范围定义不合理的问题,采用码本中码字... 传统的Codebook背景模型算法是在RGB颜色空间下建立的,该算法计算复杂、分割质量不高且抗扰动能力较差。首先利用YUV颜色空间下亮度与色度分离的特性,建立Codebook背景模型,其次针对背景模型的亮度范围定义不合理的问题,采用码本中码字的Y分量均值重新定义亮度范围,最后在运动目标检测过程中使用双层码本与短时滑动窗口相结合的背景更新方法提高抗干扰能力。实验表明,改进算法的亮度范围能够随背景变化不断更新。与传统的Codebook背景模型算法相比,该算法能够有效更新背景,同时提高检测的准确性。 展开更多
关键词 Codebook模型 YUV空间 背景更新 亮度
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光照改变预测的自适应码本模型算法 认领 引用 被引量：2
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作者 安世全 廖春梅 瞿中 《计算机工程与设计》 北大核心 2017年第8期2194-2198,共5页
为解决传统的Codebook背景模型算法需设置的参数较多,存在光照变化自适应能力不足以及检测精度不高等问题,利用增加学习率的方法对背景模型进行自适应更新,使其适应不同的光照变化环境;对YUV颜色空间中的Codebook模型进行改进,减少经验... 为解决传统的Codebook背景模型算法需设置的参数较多,存在光照变化自适应能力不足以及检测精度不高等问题,利用增加学习率的方法对背景模型进行自适应更新,使其适应不同的光照变化环境;对YUV颜色空间中的Codebook模型进行改进,减少经验参数的设置;在双层Codebook模型基础上,通过增加光照改变预测机制,判断当前像素与码字平均Y分量差值和阈值的大小,使背景模型更加准确。实验结果表明,该算法在光照变化的复杂环境下具有较好的检测率。 展开更多
关键词 Codebook模型 YUV颜色空间 自适应 学习率 光照改变预测
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基于OpenCV的公交客流计数方法 认领 引用 被引量：3
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作者 张震 李进钢 《现代电子技术》 北大核心 2017年第2期16-20,共5页
公交车客流统计是计算机视觉领域的重要研究方向,然而由于阴影、光照变化等动态纹理因素的影响使得构建一个实时精确的客流统计算法变得较为困难。针对以上难题,提出一种基于OpenCV实现单目视觉下的客流统计方法。首先对取得的实时图像... 公交车客流统计是计算机视觉领域的重要研究方向,然而由于阴影、光照变化等动态纹理因素的影响使得构建一个实时精确的客流统计算法变得较为困难。针对以上难题,提出一种基于OpenCV实现单目视觉下的客流统计方法。首先对取得的实时图像进行预处理;然后运用Codebook和形态学滤波相结合的方法建立背景模型,消除动态纹理对前景的影响;最后采用改进的Hough变换提取乘客的头部区域,进行跟踪计数。实验结果表明,乘车环境中该方法的检测准确率达88.6%以上,可应用于实时的客流计数系统。 展开更多
关键词 客流计数 Codebook 背景模型 形态学滤波 霍夫变换
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Vehicle detection algorithm based on codebook and local binary patterns algorithms 认领 引用 被引量：1
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作者 许雪梅 周立超 +1 位作者 墨芹 郭巧云 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第2期593-600,共8页
Detecting the moving vehicles in jittering traffic scenes is a very difficult problem because of the complex environment.Only by the color features of the pixel or only by the texture features of image cannot establis... Detecting the moving vehicles in jittering traffic scenes is a very difficult problem because of the complex environment.Only by the color features of the pixel or only by the texture features of image cannot establish a suitable background model for the moving vehicles. In order to solve this problem, the Gaussian pyramid layered algorithm is proposed, combining with the advantages of the Codebook algorithm and the Local binary patterns(LBP) algorithm. Firstly, the image pyramid is established to eliminate the noises generated by the camera shake. Then, codebook model and LBP model are constructed on the low-resolution level and the high-resolution level of Gaussian pyramid, respectively. At last, the final test results are obtained through a set of operations according to the spatial relations of pixels. The experimental results show that this algorithm can not only eliminate the noises effectively, but also save the calculating time with high detection sensitivity and high detection accuracy. 展开更多
关键词 background modeling Gaussian pyramid Codebook Local binary patterns（LBP） moving vehicle detection
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基于局部结构分割的维吾尔文笔迹鉴别方法 认领 引用 被引量：1
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作者 尚赵伟 李建伟 +1 位作者 张太平 艾斯卡尔·艾木都拉 《计算机工程》 CAS CSCD 2012年第10期178-181,共4页
针对基于纹理分析的全局特征提取受文本组合或字符连接影响较大,导致特征提取不稳定的现象,以及现有局部特征提取方法存在的不足,提出一种基于局部结构分割构建Codebook的维吾尔文文本无关笔迹鉴别方法。该方法根据笔迹图像的像素值提... 针对基于纹理分析的全局特征提取受文本组合或字符连接影响较大,导致特征提取不稳定的现象,以及现有局部特征提取方法存在的不足,提出一种基于局部结构分割构建Codebook的维吾尔文文本无关笔迹鉴别方法。该方法根据笔迹图像的像素值提取维吾尔文笔迹样本中具有代表性的轮廓,生成描述书写者书写风格的Codebook并进行相似性度量,从而达到笔迹鉴别的目的。实验结果表明,该方法对于维吾尔文笔迹是一种简单、可行,具有较高识别率的笔迹鉴别方法。 展开更多
关键词 笔迹鉴别 维吾尔文笔迹 轮廓提取 轮廓细化 轮廓分割 Codebook构建
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