Proceedings of the International Conference on Signal Processing and Multimedia Applications最新文献

Color face recognition: A multilinear-PCA approach combined with Hidden Markov Models 彩色人脸识别:一种结合隐马尔可夫模型的多线性pca方法

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003445501130119

D. Alexiadis, Dimitrios P. Glaroudis

引用次数: 3

Image denoising based on Laplace distribution with local parameters in Lapped Transform domain 基于拉普拉斯变换域局部参数的图像去噪

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003516900670072

V. K. Nath, A. Mahanta

{"title":"Image denoising based on Laplace distribution with local parameters in Lapped Transform domain","authors":"V. K. Nath, A. Mahanta","doi":"10.5220/0003516900670072","DOIUrl":"https://doi.org/10.5220/0003516900670072","url":null,"abstract":"In this paper, we present a new image denoising method based on statistical modeling of Lapped Transform (LT) coefficients. The lapped transform coefficients are first rearranged into wavelet like structure, then the rearranged coefficient subband statistics are modeled in a similar way like wavelet coefficients. We propose to model the rearranged LT coefficients in a subband using Laplace probability density function (pdf) with local variance. This simple distribution is well able to model the locality and the heavy tailed property of lapped transform coefficients. A maximum a posteriori (MAP) estimator using the Laplace probability density function (pdf) with local variance is used for the estimation of noise free lapped transform coefficients. Experimental results show that the proposed low complexity image denoising method outperforms several wavelet based image denoising techniques and also outperforms two existing LT based image denoising schemes. Our main contribution in this paper is to use the local Laplace prior for statistical modeling of LT coefficients and to use MAP estimation procedure with this proposed prior to restore the noisy image LT coefficients.","PeriodicalId":103791,"journal":{"name":"Proceedings of the International Conference on Signal Processing and Multimedia Applications","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126532421","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: 9

Context based watermarking of secure JPEG-LS images 基于上下文的安全JPEG-LS图像水印

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003446201610166

A. Subramanyam, S. Emmanuel

引用次数: 0

Stereo vision matching over single-channel color-based segmentation 基于单通道颜色分割的立体视觉匹配

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003473201260130

Pablo Revuelta, B. Ruíz-Mezcua, J. M. S. Peña, J. Thiran

{"title":"Stereo vision matching over single-channel color-based segmentation","authors":"Pablo Revuelta, B. Ruíz-Mezcua, J. M. S. Peña, J. Thiran","doi":"10.5220/0003473201260130","DOIUrl":"https://doi.org/10.5220/0003473201260130","url":null,"abstract":"Stereo vision is one of the most important passive methods to extract depth maps. Among them, there are several approaches with advantages and disadvantages. Computational load is especially important in both the block matching and graphical cues approaches. In a previous work, we proposed a region growing segmentation solution to the matching process. In that work, matching was carried out over statistical descriptors of the image regions, commonly referred to as characteristic vectors, whose number is, by definition, lower than the possible block matching possibilities. This first version was defined for gray scale images. Although efficient, the gray scale algorithm presented some important disadvantages, mostly related to the segmentation process. In this article, we present a pre-processing tool to compute gray scale images that maintains the relevant color information, preserving both the advantages of gray scale segmentation and those of color image processing. The results of this improved algorithm are shown and compared to those obtained by the gray scale segmentation and matching algorithm, demonstrating a significant improvement of the computed depth maps.","PeriodicalId":103791,"journal":{"name":"Proceedings of the International Conference on Signal Processing and Multimedia Applications","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132438649","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

AER spike-processing filter simulator: Implementation of an AER simulator based on cellular automata AER峰值处理滤波器模拟器:基于元胞自动机的AER模拟器的实现

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003525900910096

Manuel Rivas Pérez, A. Linares-Barranco, A. Jiménez-Fernandez, A. C. Balcells, G. Jiménez-Moreno

{"title":"AER spike-processing filter simulator: Implementation of an AER simulator based on cellular automata","authors":"Manuel Rivas Pérez, A. Linares-Barranco, A. Jiménez-Fernandez, A. C. Balcells, G. Jiménez-Moreno","doi":"10.5220/0003525900910096","DOIUrl":"https://doi.org/10.5220/0003525900910096","url":null,"abstract":"Spike-based systems are neuro-inspired circuits implementations traditionally used for sensory systems or sensor signal processing. Address-Event-Representation (AER) is a neuromorphic communication protocol for transferring asynchronous events between VLSI spike-based chips. These neuro-inspired implementations allow developing complex, multilayer, multichip neuromorphic systems and have been used to design sensor chips, such as retinas and cochlea, processing chips, e.g. filters, and learning chips. Furthermore, Cellular Automata (CA) is a bio-inspired processing model for problem solving. This approach divides the processing synchronous cells which change their states at the same time in order to get the solution. This paper presents a software simulator able to gather several spike-based elements into the same workspace in order to test a CA architecture based on AER before a hardware implementation. Furthermore this simulator produces VHDL for testing the AER-CA into the FPGA of the USB-AER AER-tool.","PeriodicalId":103791,"journal":{"name":"Proceedings of the International Conference on Signal Processing and Multimedia Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123012124","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

Optimal combination of low-level features for surveillance object retrieval 用于监视对象检索的底层特征的最佳组合

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003527101870192

Virginia Fernandez Arguedas, K. Chandramouli, Qianni Zhang, E. Izquierdo

引用次数: 1

Segmentation of touching Lanna characters 触摸兰纳字符的分割

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003511300470051

Sakkayaphop Pravesjit, A. Thammano

引用次数: 2

What are good CGS/MGS configurations for H.264 quality scalable coding? 什么是好的CGS/MGS配置为H.264质量可扩展编码?

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003608201040109

Shih-Hsuan Yang, Wei-Lune Tang

{"title":"What are good CGS/MGS configurations for H.264 quality scalable coding?","authors":"Shih-Hsuan Yang, Wei-Lune Tang","doi":"10.5220/0003608201040109","DOIUrl":"https://doi.org/10.5220/0003608201040109","url":null,"abstract":"Scalable video coding (SVC) encodes image sequences into a single bit stream that can be adapted to various network and terminal capabilities. The H.264/AVC standard includes three kinds of video scalability, spatial scalability, temporal scalability, and quality scalability. Among them, quality scalability refers to image sequences of the same spatio-temporal resolution but with different fidelity levels. Two options of quality scalability are adopted in H.264/AVC, namely CGS (coarse-grain quality scalable coding) and MGS (medium-grain quality scalability), and they may be used in combinations. A refinement layer in CGS is obtained by re-quantizing the (residual) texture signal with a smaller quantization step size (QP). Using the CGS alone, however, may incur notable PSNR penalty and high encoding complexity if numerous rate points are required. MGS partitions the transform coefficients of a CGS layer into several MGS sub-layers and distributes them in different NAL units. The use of MGS may increase the adaptation flexibility, improve the coding efficiency, and reduce the coding complexity. In this paper, we investigate the CGS/MGS configurations that lead to good performance. From extensive experiments using the JSVM (Joint Scalable Video Model), however, we find that MGS should be carefully employed. Although MGS always reduces the encoding complexity as compared to using CGS alone, its rate-distortion is unstable. While MGS typically provides better or comparable rate-distortion performance for the cases with eight rate points or more, some configurations may cause an unexpected PSNR drop with an increased bit rate. This anomaly is currently under investigation.","PeriodicalId":103791,"journal":{"name":"Proceedings of the International Conference on Signal Processing and Multimedia Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128549929","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: 1

Real-time face recognition with GPUs: A DCT-based face recognition system using graphics processing unit 基于图形处理器的实时人脸识别:一个基于dct的人脸识别系统

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003445601200125

D. Alexiadis, A. Papastergiou, A. Hatzigaidas

引用次数: 1

Four-phase re-speaker training system 四阶段复说训练系统

Proceedings of the International Conference on Signal Processing and Multimedia Applications Pub Date : 2011-07-18 DOI: 10.5220/0003604502170220

A. Pražák, Zdenek Loose, J. Psutka, V. Radová, L. Müller

引用次数: 6