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14th IEEE International Symposium on Computational Intelligence and Informatics, CINTI 2013

作者： Siles, Ing. Francisco PRIS-lab: Pattern Recognition and Intelligent Systems Laboratory School of Electrical Engineering Universidad de Costa Rica San José Costa Rica

ISBN: (纸本)9781479901975

This paper presents a new dissimilarity measure for the detection of dynamic overlays in football games from TV broadcasting. The detection of the dynamic overlays is used for finding the replays in the input video, that are to be removed for further processing. The replays' detection and removal is part of the first module of the system ACE-Football for the automated interpretation of association football games, which is being developed at the pris-lab. Positive results of experiments conducted on several games of the latest FIFA's World Cup are presented. © 2013 IEEE.

关键词： Sports

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Deceived bilateral filter for improving the classification of football players from TV broadcast 3

Deceived bilateral filter for improving the classification o...

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3rd IEEE International Work-Conference on Bioinspired Intelligence, IWOBI 2014

作者： Ramírez, Saúl Calderón Canales, Francisco Siles PRIS-LAB: Pattern Recognition and Intelligent Systems Laboratory School of Electrical Engineering Faculty of Engineering Universidad de Costa Rica San José Costa Rica

ISBN: (纸本)9781479961740

This paper presents a novel image abstraction tech- nique, the deceived bilateral filter (DBF). The DBF combines border sharpening with simplification of homogeneous regions to achieve moderate de-blurring and colour emphasis. The aim of the DBF is to remove noise of colour and shape descriptors (histograms and contours) of the blobs corresponding to football players. The experiment implemented for this paper consists in an unsupervised histogram based classification of the blobs based on the team of the football players aiming to evaluate histogram denoising. The results show an average classification success rate improvement of 11%. © 2014 IEEE.

关键词： Image enhancement

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Teleoperation of a Humanoid Robot Using an Optical Motion Capture System

Teleoperation of a Humanoid Robot Using an Optical Motion Ca...

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2018 IEEE International Work Conference on Bioinspired Intelligence, IWOBI 2018

作者： Nunez, L. Dajles, D. Siles, F. Department of Electrical Engineering School of Engineering Universidad de Costa Rica PRIS-Lab: Pattern Recognition and Intelligent Systems Laboratory San Jose Costa Rica

ISBN: (纸本)9781538675069

Given the resemblance between the human body and that of a humanoid robot, a very intuitive control system might use motion capture;the system would track the motion of different key joints along the body of the human operator and the robot should mimic the action. To mimic the human's actions, a structure that supports and solves the issues related to motion tracking, human-robot figure relation, motion stability, and other issues is needed. This project consist of the development of a teleoperation system, which would allow a NAO humanoid robot to behave as a human motion imitator, using an optical motion capture system. © 2018 IEEE.

关键词： Remote control

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Goniometry-based Glitch-Correction Algorithm for Optical Motion Capture Data

Goniometry-based Glitch-Correction Algorithm for Optical Mot...

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2018 IEEE International Work Conference on Bioinspired Intelligence, IWOBI 2018

作者： Castresana, M. Siles, F. Department of Electrical Engineering School of Engineering Universidad de Costa Rica PRIS-Lab: Pattern Recognition and Intelligent Systems San José Costa Rica

ISBN: (纸本)9781538675069

Nowadays , motion capture technology is used in productions of all levels in 3D Animation. The concept on which this technology is based on, consists of the elaboration of 3D models from numerical data taken by a set of sensors (for example infrared cameras) interpreted by a software. The problem with this technology is that the processing of data generated by these sensors is not always accurate, causing loss of positional data which results in errors called glitches, that produce corrupted 3D models. In this work, a goniometry-based algorithm to detect, locate and correct the glitches generated from optical motion capture data is presented. Based on the classification of angular measures of the articular physiology in humans, a pattern recognition approach was used to construct the algorithm. The proposed algorithm produces average F1-scores of 0.956 using synthetical data, and produces natural results in most of the cases for real data. © 2018 IEEE.

关键词： pattern recognition

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M-Phase Feature Extraction Algorithm for Phenotype Classification from Cancer Brightfield Microscopy

M-Phase Feature Extraction Algorithm for Phenotype Classific...

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2018 IEEE International Work Conference on Bioinspired Intelligence, IWOBI 2018

作者： Mora-Zuniga, A. Quiros-Barrantes, Steve Siles, F. Department of Electrical Engineering School of Engineering PRIS-Lab: Pattern Recognition and Intelligent Systems Laboratory Costa Rica School of Microbiology Universidad de Costa Rica San Jose Costa Rica

ISBN: (纸本)9781538675069

In this paper a workflow to extract cell features from brightfield microscopy image sequences is proposed. An event driven approach, combined with a forward and backward tracking limited by the cell's circularity was proven enough to extract relevant features that can be used to classify the cells into four phenotypes related to chemosensitivity studies: cell cycle arrest, apoptotic, damage proliferation and cells that have repaired their DNA damage. An average F1-Score greater than 0.7 was achieved in the detection and follow up of the events on images that present characteristics that impede the use of classic image segmentation and methods. © 2018 IEEE.

关键词： Cells

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Complexity Research of Massively Microblogging Based on Human Behaviors

Complexity Research of Massively Microblogging Based on Huma...

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International Workshop on Database Technology and Applications

作者： Shulong Kang Chuang Zhang Zhiqing Lin Xueming Shi He Ma Pattern Recognition & Intelligent Systems Laboratory (PRIS) Beijing University of Posts and Telecommunications Beijing China

Microblogging is one of the most popular on-line social services by which people can share information and communicate with others. In the paper, it is proved that in a microblogging's social network, there exists small-world, scale-free and high clustering coefficient characteristics, which are three main properties of complex network. It means that microblogging's social network is a complex network. Besides, it is verified that the number of microblogs and the frequency of posting microblogs follow power-law distributions, which is an evidence that shows human dynamics are non-Poissonian. The related geographical property analysis of microblogging's social network illustrates the reason of users' geographical distribution.

关键词： Social network services Humans Complex networks Internet Crawlers Web pages Mobile handsets

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Temporal Segmentation of Association Football from TV Broadcasting

Temporal Segmentation of Association Football from TV Broadc...

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IEEE International Conference on intelligent Engineering systems

作者： Francisco Siles PRIS-LAB: Pattern Recognition and Intelligent Systems Laboratory School of Electrical Engineering Faculty of Engineering Universidad de Costa Rica

ISBN: (纸本)9781479908271

This paper presents the first module of our system ACE for the automated interpretation of association football games. This module is in charge of the temporal segmentation of the input broadcasting TV video into scenes. The temporal segmentation is based on a new devised dissimilarity measure using the Bhattacharyya distance of the hue and local spatial variance histograms, to incorporate chromatic and structural properties of the images. Great results of extended experiments conducted on the last FIFA's World Cup are presented.

关键词： television broadcasting Footballs segmentation Segmentation color tones Structural properties

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Gait Planning and Motion Control Based on Vrep Simulation for Quadruped Robot 5

Gait Planning and Motion Control Based on Vrep Simulation fo...

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5th World Robot Conference Symposium on Advanced Robotics and Automation, WRC SARA 2023

作者： Zhou, Linqi Chen, Zhihua Liu, Jun Liu, Zhi Chen, Yumeng Zhang, Liting Nanchang Hangkong University Key Laboratory of Jiangxi Province for Image Processing and Pattern Recognition Moe Key Lab of Nondestructive Testing Technology Nanchang330063 China Beijing Institute of Technology State Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing100081 China

ISBN: (纸本)9798350307320

Gait planning of quadruped robots plays an important role in achieving less walking, including dynamic and static gait. In this article, a static and dynamic gait control method based on center of gravity stability margin is proposed. Firstly, the robot model and kinematics modeling are introduced. Secondly, the robot's foot static and dynamic gait were planned and the foot trajectory was designed. Finally, two types of gait of the robot were simulated using Vrep simulation software, and the differences in stability and speed between the coordinated gait with speed and stability in the static and dynamic gait of a 12 degree of freedom robot were analyzed, verifying the effectiveness of the gait control method proposed in this paper. © 2023 IEEE.

关键词： Robot programming

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MiSiM:Microstructured Fibers' Simulator

MiSiM:Microstructured Fibers' Simulator

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Latin American Electron Devices Conference (LAEDC)

作者： Paola Montero-Sánchez Ricardo Román-Brenes F. Siles Jaime Cascante-Vindas LAFTLA: Laboratorio de Fotónica y Tecnología Láser Aplicada Universidad de Costa Rica San José Costa Rica PRIS-Lab: Pattern Recognition and Intelligent Systems Laboratory Universidad de Costa Rica San José Costa Rica

ISBN: (数字)9781728110448

ISBN: (纸本)9781728110455

In this work we present MISIM: a free and open software tool for the simulation of microstructured fibers, that can be used for the calculation of their dispersion profiles, for its design and posterior manufacturing. The software is based on the numerical model of Saitoh and Koshiba, and it is able to simulate chromatic dispersion, effective index and group index for a given spectral range. MISIM generates output text files as well as line charts of the simulated parameters. As far as we known, it is the only open and free software with a GUI that can visualize its output directly. For the validation of the tool, results from MISIM were compared with those reported in the literature using different methods to calculate their profiles, obtaining, for example effective indexes within one standard deviation of those reported. Even smaller errors (2.61%) were obtained for the chromatic dispersion using our proposed tool.

关键词： Software Indexes Chromatic dispersion Mathematical model Tools Graphical user interfaces

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Analysis of Key Factors in Heat Demand Prediction with Neural Networks

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Energy Procedia 2017年 105卷 2965-2970页

作者： Jiyang Xie Hailong Li Zhanyu Ma Qie Sun Fredrik Wallin Zhongwei Si Jun Guo Pattern Recognition and Intelligent Systems Lab. Beijing University of Posts and Telecommunications China School of Business Society and Engineering Mälardalen University Sweden Institute of Thermal Science and Technology Shandong University China Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications China

The development of heat metering has promoted the development of statistic models for the prediction of heat demand, due to the large amount of available data, or big data. Weather data have been commonly used as input in such statistic models. In order to understand the impacts of direct solar radiance and wind speed on the model performance comprehensively, a model based on Elman neural networks (ENN) was adopted, of which the results can help heat producers to optimize their production and thus mitigate costs. Compared with the measured heat demand, the introduction of wind speed and direct solar radiation has opposite impacts on the performance of ENN and the inclusion of wind speed can improve the prediction accuracy of ENN. However, ENN cannot benefit from the introduction of both wind speed and direct solar radiation simultaneously.

关键词： District heating data processing prediction heat demand CHP plant

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