发布求助
文献互助 智能选刊 最新文献

2012 Visual Communications and Image Processing最新文献

筛选
英文 中文
Enhanced moving object detection using tracking system for video surveillance purposes 增强移动目标检测使用跟踪系统的视频监控目的
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410776
A. Beaugendre, Chenyuan Zhang, Jiu Xu, S. Goto
{"title":"Enhanced moving object detection using tracking system for video surveillance purposes","authors":"A. Beaugendre, Chenyuan Zhang, Jiu Xu, S. Goto","doi":"10.1109/VCIP.2012.6410776","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410776","url":null,"abstract":"Foreground extraction and moving object detection are often used in human tracking systems. However those methods are not able to produce accurate results when objects are too close or when occlusions happen since the result is generally a single big blob which contains all the different objects. In this paper we propose a novel and efficient moving object detection enhancement method. Indeed, by using the results of the previous iteration tracking we are able to keep a correct number of moving objects by removing useless blobs and by splitting those which contain more than one tracker. The method can also speed up the tracking by creating a link between a tracker and a blob to avoid unnecessary processing in some situations.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122565149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Classification based on sparse representation and Euclidian distance 基于稀疏表示和欧氏距离的分类
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410815
Ali Julazadeh, M. Marsousi, J. Alirezaie
{"title":"Classification based on sparse representation and Euclidian distance","authors":"Ali Julazadeh, M. Marsousi, J. Alirezaie","doi":"10.1109/VCIP.2012.6410815","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410815","url":null,"abstract":"In this paper, A novel classification approach based on sparse representation framework is proposed. The method finds the minimum Euclidian distance between an input patch (pattern) and atoms (templates) of a learnt-base dictionary for different classes to perform the classification task. A mathematical approach is developed to map the sparse representation vector to Euclidian distances. We show that the highest coefficient of the sparse vector is not necessarily a suitable indicator to classify input patches, and it results in classification errors. The K-SVD dictionary learning method is utilized to separately create class specific sub-dictionaries. The proposed algorithm is compared with the conventional sparse representation classification (SRC) framework to evaluate its performance. Our experimental results demonstrate a higher accuracy with a lower computational time.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122714326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
QoE-aware resource allocation for scalable video transmission over multiuser MIMO-OFDM systems 多用户MIMO-OFDM系统中可扩展视频传输的qos感知资源分配
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410733
M. Li, Zhenzhong Chen, Yap-Peng Tan
{"title":"QoE-aware resource allocation for scalable video transmission over multiuser MIMO-OFDM systems","authors":"M. Li, Zhenzhong Chen, Yap-Peng Tan","doi":"10.1109/VCIP.2012.6410733","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410733","url":null,"abstract":"We investigate in this paper how to maximize multiuser Quality of Experience (QoE) when scalable videos are transmitted over Multiple-Input Multiple-Output (MIMO)-Orthogonal Frequency Division Multiplexing (OFDM) systems. We first study the QoE issues in Scalable Video Coding (SVC) adaptation by constructing a QoE assessment database. We derive the optimal scalability adaptation track for individual video and further summarize common scalability adaptation tracks for grouped videos. A rate-model is developed for SVC adaptation and is employed in designing an efficient resource allocation solution for SVC streaming over multiuser MIMO-OFDM systems. Specifically, time-frequency unit assignment, power allocation, and modulation selection are jointly optimized to maximize users' QoE. Experimental results show that the proposed QoE-aware scalability adaptation scheme significantly outperforms the conventional adaptation schemes, and the proposed QoE-aware resource allocation achieves better QoE performance when compared to existing resource allocation methods.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125137646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Gaze-Driven video streaming with saliency-based dual-stream switching 基于显著性的双流切换的注视驱动视频流
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410732
Yunlong Feng, Gene Cheung, Wai-tian Tan, Yusheng Ji
{"title":"Gaze-Driven video streaming with saliency-based dual-stream switching","authors":"Yunlong Feng, Gene Cheung, Wai-tian Tan, Yusheng Ji","doi":"10.1109/VCIP.2012.6410732","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410732","url":null,"abstract":"The ability of a person to perceive image details falls precipitously with larger angle away from his visual focus. At any given bitrate, perceived visual quality can be improved by employing region-of-interest (ROI) coding, where higher encoding quality is judiciously applied only to regions close to a viewer's focal point. Straight-forward matching of viewer's focal point with ROI coding using a live encoder, however, is computation-intensive. In this paper, we propose a system that supports ROI coding without the need of a live encoder. The system is based on dynamic switching between two pre-encoded streams of the same content: one at high quality (HQ), and the other at mixed quality (MQ), where quality of a spatial region depends on its pre-computed visual saliency values. Distributed source coding (DSC) frames are periodically inserted to facilitate switching. Using a Hidden Markov Model (HMM) to model a viewer's temporal gaze movement, MQ stream is pre-encoded based on ROI coding to minimize the expected streaming rate, while keeping the probability of a viewer observing low quality (LQ) spatial regions below an application-specific ϵ. At stream time, the viewer's gaze locations are collected and transmitted to server for intelligent stream switching. In particular, server employs MQ stream only if: i) viewer's tracked gaze location falls inside the high-saliency regions, and ii) the probability that a viewer's gaze point will soon move outside high-saliency regions, computed using tracked gaze data and updated saliency values, is below ϵ. Experiments showed that video streaming rate can be reduced by up to 44%, and subjective quality is noticeably better than a competing scheme at the same rate where the entire video is encoded using equal quantization.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129299556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Optimized rateless UEP codes for scalable video streaming 优化的无速率UEP代码可扩展的视频流
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410765
J. Zao, M. Hornansky, Pei-Lun Diao, Bo-Wei Wang, Chung-hsuan Wang, Li-Jen Chang
{"title":"Optimized rateless UEP codes for scalable video streaming","authors":"J. Zao, M. Hornansky, Pei-Lun Diao, Bo-Wei Wang, Chung-hsuan Wang, Li-Jen Chang","doi":"10.1109/VCIP.2012.6410765","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410765","url":null,"abstract":"Wireless video streaming often suffers from heavy and varying amount of packet loss. Short-length Luby Transform (SLLT) codes are often employed to offer necessary rateless or universal erasure protection. Nevertheless, a proficient method for finding the optimal degree distributions of SLLT codes is still missing although the asymptotic behaviors of infinite-length LT codes have long been deduced. In this paper, we propose a practical approach to find the optimal degree distributions of LT codes with arbitrary input block lengths. Our approach starts with a new fitness model for the LT codes based on three performance measurements: their coding overhead ε, decoding failure ratio r and failure probability p. We then employed the exponential natural evolution strategy (xNES) along with a suitable choice of initial degree distribution and a proper transformation between the genotypes and the phenotypes to search for the optimized degree distributions. The optimized SLLT codes designed using this approach far outperforms the ones obtained through asymptotic approximation. As an example application, we constructed a family of rateless convolutional UEP codes using these optimized SLLT codes as the rateless postcodes. These codes offer superb universal unequal erasure protection to wireless H.264/SVC broadcasting with only 16%-20% coding overhead. This design exercise, however, made clear the necessity of matching the rateless erasure correction capability of the SLLT postcode with the error-rate sensitive UEP capability of the convolutional precode. The effect of code matching was demonstrated clearly in the improvement of rate-distortion performance of video playback.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121312643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An adaptive covariance-based edge diffusion image enlargement method 基于协方差的自适应边缘扩散图像放大方法
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410843
Tao Fan, Haiwu Zhao, Guozhong Wang, Jianwen Chen, Feng Xu, J. Villasenor
{"title":"An adaptive covariance-based edge diffusion image enlargement method","authors":"Tao Fan, Haiwu Zhao, Guozhong Wang, Jianwen Chen, Feng Xu, J. Villasenor","doi":"10.1109/VCIP.2012.6410843","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410843","url":null,"abstract":"We discuss image or video enlargement methods aimed at computationally constrained environments. Traditional enlargement algorithms such as linear or cubic interpolation have been applied in many applications. However the performance of these approaches is limited by artifacts such as blurring and jagged edges. More sophisticated iterative and learning-based algorithms have been proposed to address these issues, but they typically involve very high computational complexity. We present an adaptive covariance-based edge diffusion (ACED) image enlargement method that offers both good performance and low complexity. Different from other edge-directed interpolation algorithms, the proposed method uses combination of a novel edge-directed judgment which can choose different spread templates adaptively to estimate local covariance coefficients and edge diffusion to reduce artifacts. Experimental results show that the proposed method gives performs well both in terms of subjective quality as well as objective measures.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131089256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Optimization of generalized LT codes for progressive image transfer 用于渐进图像传输的广义LT代码的优化
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410782
Suayb S. Arslan, P. Cosman, L. Milstein
{"title":"Optimization of generalized LT codes for progressive image transfer","authors":"Suayb S. Arslan, P. Cosman, L. Milstein","doi":"10.1109/VCIP.2012.6410782","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410782","url":null,"abstract":"Rateless codes allow a user to incrementally send additional redundancy, so they can be useful for heterogeneous and time-varying networks for which the choice of redundancy level in advance is difficult. Rateless codes are an attractive application layer forward error correction solution due to their flexibility and capacity-approaching performance. The original rateless codes were developed for the delivery of equally important information. In many multimedia applications, some data symbols are more important than others. Unequal error protection (UEP) designs are attractive solutions for such transmissions. However previous UEP rateless code designs were aimed for coarsely layered sources and might exhibit poor performance for fine-grained progressive coding. The main objective of this paper is to introduce a more generalized coding scheme, parameters of which can be tailored for progressive multimedia transmission. We present the optimization of a generalized rateless code using two different progressive source transmission protocols. Proposed coding scheme is shown to exhibit better unequal protection and recovery time properties than other published results.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132876314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Optimized tone mapping with perceptually uniform luminance values for backward-compatible high dynamic range video compression 为向后兼容的高动态范围视频压缩优化了具有感知均匀亮度值的色调映射
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410792
A. Koz, F. Dufaux
{"title":"Optimized tone mapping with perceptually uniform luminance values for backward-compatible high dynamic range video compression","authors":"A. Koz, F. Dufaux","doi":"10.1109/VCIP.2012.6410792","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410792","url":null,"abstract":"Backward compatibility for high dynamic range image and video compression forms one of the essential requirements in the transition phase from low dynamic range (LDR) displays to high dynamic range (HDR) displays. In a recent work [1], an optimized solution for tone mapping and inverse tone mapping of HDR images is achieved in terms of mean square error (MSE) of the logarithm of luminance values of HDR image pixels for backward-compatible compression. A disadvantage of this approach was to use non uniform luminance values according to Human perception for minimization, which causes quite non-natural over-illumination in the produced LDR images. In this paper, we propose to use perceptually uniform luminance values as an alternative for the optimization of tone mapping curve. The results indicate that the proposed approach gives better performance (0.5-1 dB gains) in terms of Perceptually Uniform Peak Signal to Noise Ratio (PU-PSNR) and produces more realistic LDR images.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133122646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
A wireless video surveillance system with an active camera 带有活动摄像头的无线视频监控系统
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410812
Yun Ye, S. Ci, Yanwei Liu, Dalei Wu, Haohong Wang, A. Katsaggelos
{"title":"A wireless video surveillance system with an active camera","authors":"Yun Ye, S. Ci, Yanwei Liu, Dalei Wu, Haohong Wang, A. Katsaggelos","doi":"10.1109/VCIP.2012.6410812","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410812","url":null,"abstract":"This paper introduced a camera surveillance system in wireless communications. The system contains three major modules, PTU (pan-tilt unit) camera control for surveillance video capture, cross-layer control for data compression and transmission, and error concealment for video quality enhancement. Our contribution is twofold. First, a system design for data collection and transmission over wireless networks is presented and is evaluated with physical surveillance equipments. The camera is capable of following the moving target according to the control information. The end-to-end distortion estimation in the delay constrained video coding process takes into account the dynamic channel condition and physical layer modulation and coding scheme (MCS) to determine optimal coding and transmission parameters. Second, multiple error concealment strategies, including interleaving, boundary match and video up-sampling, are applied utilizing the special property of the PTU camera motion.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127853693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Integrated camera and sensor networks: Algorithms, design, and applications 集成相机和传感器网络:算法、设计和应用
2012 Visual Communications and Image Processing Pub Date : 2012-11-01 DOI: 10.1109/VCIP.2012.6410854
Zhihai He
{"title":"Integrated camera and sensor networks: Algorithms, design, and applications","authors":"Zhihai He","doi":"10.1109/VCIP.2012.6410854","DOIUrl":"https://doi.org/10.1109/VCIP.2012.6410854","url":null,"abstract":"Recent technological advances in hardware miniaturization of sensors, low-power microprocessor design, and wireless ad hoc networking have enabled the deployment of large-scale wireless sensor networks. A wireless sensor network is a system of geographically distributed sensor nodes that communicate with each other over a dynamic and self-organizing wireless network. In a wireless video sensor network (WVSN), each sensor, equipped with video capture and processing capabilities, is tasked to capture digital video information about the target event or situation, and deliver the video data to the remote control unit for further information analysis and decision making.","PeriodicalId":103073,"journal":{"name":"2012 Visual Communications and Image Processing","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114962036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信