Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004.最新文献

Real-valued pattern classification based on extended associative memory 基于扩展联想记忆的实值模式分类

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342608

Juan Humberto Sossa Azuela, Ricardo Barrón, R. Vázquez

引用次数: 16

Robust MPEG-2 SNR scalable coding using variable end-of-block 鲁棒MPEG-2信噪比可扩展编码使用可变结束块

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342600

R. Hasimoto-Beltrán, A. Khokhar

{"title":"Robust MPEG-2 SNR scalable coding using variable end-of-block","authors":"R. Hasimoto-Beltrán, A. Khokhar","doi":"10.1109/ENC.2004.1342600","DOIUrl":"https://doi.org/10.1109/ENC.2004.1342600","url":null,"abstract":"Signal-to-noise ratio (SNR) scalable coding over priority networks has been used as a robust mechanism to transmission errors, since the most important information (base layer) can be sent over an error free channel as in the case of ATM networks or over protected channel as in the case of IP networks. SNR scalability ensures a minimum video quality at the receiver end by sacrificing the least important information (enhancement layer) when losses occur. However, one disadvantage of scalable coding is its lower compression performance with respect to the one-layer encoding (/spl sim/10-15%, (D. Wilson and M. Ghanbari, 1999)). In this work, we propose an error resilient scheme for MPEG-2 SNR scalable video transmission that is compression efficient, in addition to providing scalable error resynchronization mechanism to enhancement layer that impedes the propagation of errors beyond the physically affected area in the bitstream. In order to provide robustness to errors during transmission, the proposed scheme uses triangular coding in the transform domain (R. Hasimoto-Beltran et al., 2000) and a modified variable end of block based on the number of bits per unit of block. Our scheme yields significantly better compression ratios compared to the MPEG-2 standard (3% to 6.7%) while at the same time improves considerably the quality of the received data (2-11 db) under different conditions of data losses.","PeriodicalId":103999,"journal":{"name":"Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004.","volume":"156 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128731980","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

Real-time embedded vision system development using AIBO Vision Workshop 2 基于AIBO视觉的实时嵌入式视觉系统开发

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342616

N. Lovell

{"title":"Real-time embedded vision system development using AIBO Vision Workshop 2","authors":"N. Lovell","doi":"10.1109/ENC.2004.1342616","DOIUrl":"https://doi.org/10.1109/ENC.2004.1342616","url":null,"abstract":"Development of visual processing components in embedded systems is a difficult task. The nature of embedded devices not only limits the processing power available to applications, but the limited I/O facilities also considerably hinder development. Several complexities emerge for testing, debugging, quality evaluation and profiling when developing on an embedded device. This means that vision processing algorithms are not only harder to design for embedded systems, but require more time to debug and test than would be the case on a general purpose computing device. However the increase in deployment of robotic systems has seen embedded vision development becoming increasingly necessary in many problem domains. AIBO Vision Workshop 2 (AVW2) is a utility that address these problems associated with vision processing development on embedded systems by providing a flexible, off-line, modularised vision pipeline. That is, AVW2 aids developers in this area as it provides an immersive environment where each step (module) can be flexibly placed in a user configured vision pipeline. The output can then be rigorously inspected and tested. The code of the embedded system is executed in the environment of the AVW2 tool allowing profiling (experimental evaluation of the time requirements of the code).","PeriodicalId":103999,"journal":{"name":"Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004.","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126703301","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

Central action selection using sensor fusion 使用传感器融合的中央动作选择

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342619

Fernando Montes-González, A. Marín-Hernández

引用次数: 11

Supporting structured, semi-structured and unstructured data in digital libraries 支持数字图书馆中的结构化、半结构化和非结构化数据

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342629

J. A. Sánchez, Carlos Proal, M. F. Maldonado-Naude

引用次数: 7

Sphere Juggler: fast context retrieval in support of working spheres 球体杂耍器:支持工作球体的快速上下文检索

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342628

Rodrigo Morteo, Víctor M. González, J. Favela, G. Mark

引用次数: 19

Feature selection for visual gesture recognition using hidden Markov models 基于隐马尔可夫模型的视觉手势识别特征选择

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342606

J.A. Montero, L. Sucar

{"title":"Feature selection for visual gesture recognition using hidden Markov models","authors":"J.A. Montero, L. Sucar","doi":"10.1109/ENC.2004.1342606","DOIUrl":"https://doi.org/10.1109/ENC.2004.1342606","url":null,"abstract":"Hidden Markov models have become the preferred technique for visual recognition of human gestures. However, the recognition rate depends on the set of visual features used, and also on the number of states of the hidden variable. It is difficult to determine a priori the optimal set of features and number of states. We analyse experimentally the use of different features for gesture recognition in an office environment. We considered a set of seven gestures that include interaction with other objects, such as writing, using the mouse, opening a drawer, etc. We use a single camera to detect and track the hand of the user based on adaptive colour histograms. From tracking the hand in a video sequence we obtain several features. The features considered include position and velocity in polar and Cartesian coordinates, and the trajectory represented as a chain code. Given that these features are continuous, we discretized them into a set of symbols using vector quantization. We then tested the recognition rate using HMMs with different: (i) number of discrete symbols; (ii) number of hidden states, (Hi) combination of features. The results show a high variation on the recognition rate depending on these parameters, from below 50% to more than 95%. The best performance (97%) was obtained by using the magnitude and orientation in polar coordinates, 64 discrete symbols and 10 states.","PeriodicalId":103999,"journal":{"name":"Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004.","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131518331","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: 19

Deterring password sharing: user authentication via fuzzy c-means clustering applied to keystroke biometric data 防止密码共享:通过应用于击键生物特征数据的模糊c均值聚类进行用户认证

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342604

S. Mandujano, Rogelio Soto

引用次数: 46

Similarity search in seismological signals 地震信号的相似性搜索

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342588

A. Angeles-Yreta, H. Solis-Estrella, V. Landassuri-Moreno, J. Figueroa-Nazuno

引用次数: 5

A fairness study of the adaptive RIO active queue management algorithm 自适应里约热内卢主动队列管理算法的公平性研究

Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004. Pub Date : 2004-09-20 DOI: 10.1109/ENC.2004.1342589

R. Cartas, J. Orozco, J. Incera, David Ros

{"title":"A fairness study of the adaptive RIO active queue management algorithm","authors":"R. Cartas, J. Orozco, J. Incera, David Ros","doi":"10.1109/ENC.2004.1342589","DOIUrl":"https://doi.org/10.1109/ENC.2004.1342589","url":null,"abstract":"Active queue management (AQM) mechanisms manage queue lengths by dropping packets when congestion is building up; end-systems can then react to such losses by reducing their packet rate, hence avoiding severe congestion. They are also very useful for the differentiated forwarding of packets in the DiffServ architecture. Many studies have shown that setting the parameters of an AQM algorithm may prove difficult and error-prone, and that the performance of AQM mechanisms is very sensitive to network conditions. The adaptive RIO mechanism (A-RIO) addresses both issues. It requires a single parameter, the desired queuing delay and adjusts its internal dynamics accordingly. A-RIO has been thoroughly evaluated in terms of delay response and network utilization but no study has been conducted in order to evaluate its behaviour in terms of fairness. By way of ns-2 simulations, This work examines A-RIO's ability to fairly share the network's resources (bandwidth) between the flows contending for those resources. Using Jain's fairness index as our performance metric, we compare the bandwidth distribution among flows obtained with A-RIO and with RIO.","PeriodicalId":103999,"journal":{"name":"Proceedings of the Fifth Mexican International Conference in Computer Science, 2004. ENC 2004.","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123401824","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