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检索条件"任意字段=21st Brazilian Symposium on Computer Graphics and Image Processing"

共 214 条记录，以下是121-130 订阅

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Identifying facial gestures to emulate a mouse: control application in a web browser 21

Identifying facial gestures to emulate a mouse: control appl...

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21st symposium on Signal processing, images and Artificial Vision (stSIVA)

作者： Mosquera, Hernando Loaiza, Humberto Nope, Sandra Restrepo, Andres Univ Valle Cali Valle Del Cauca Colombia

ISBN: (纸本)9781509037971

computer interfaces continue using mouse and keyboard, although the form of human interaction is based primarily on exchange of audiovisual messages generated by the voice and body gestures in general. Because of the importance of gestures in human communication and the possibility for people with limited mobility of the upper limbs, this research focuses on the development of an interface to emulate the mouse and keyboard through facial gestures and head movement. The system was developed to interact with a web browser by processing and analysis of images provided by a webcam. The interface allows typing for text searching, move the mouse, click by closing one eye, open and navigate between tabs, vertical scroll, zoom, back and leave. Tests show a moving speed of cursor 411 px/s and a write speed of 3.5 characters/s, correct activation of right and left clicks 94% and 92% respectively. Finally, the survey showed a high user satisfaction while browsing on Internet.

关键词： Internet navigation Face tracking Mouse emulation computer vision Human computer interaction Information and communications technology

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3D surface reconstruction of entomological specimens from uniform Multi-view image datasets 21

3D surface reconstruction of entomological specimens from un...

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21st symposium on Signal processing, images and Artificial Vision (stSIVA)

作者： Sosa, German D. Rodriguez, Sebastian Guaje, Javier Victorino, Jorge Mejia, Manuel Fuentes, Luz stella Ramirez, Angelica Franco, Hugo Univ Cent Bogota Colombia Univ Nacl Colombia Bogota Colombia Univ Jorge Tadeo Lozano Bogota Colombia

ISBN: (纸本)9781509037971

Modeling of 3D objects and scenes have become a common tool in different applied fields from simulationbased design in high-end engineering applications (aviation, civil structures, engine components, etc.) to entertainment (computer-based animation, video-game development, etc.). In Biology and related fields, 3D object modeling and reconstruction provide valuable tools to support the visualization, comparison and even morphometric analysis in both academical and applied tasks. Such computational tools, usually implemented as webbased virtual reality applications, significantly reduce the manipulation of fragile samples, preventing their damage and, even, their complete loss. On the other hand, they allow to take the morphological properties of physical specimens to the digital domain, giving support to common entomology tasks such as characterization, morphological taxonomy and teaching. This paper addresses the problem of producing reliable 3D point clouds from the surface of entomological specimens, based on a proved approach for multiview 3D reconstruction from high resolution pictures. Given the traditional issues of macro-photography for small sized objects (i.e. short depth of field, presence of subtle and complex structures, etc.), a pre-processing protocol, based on focus stacking, supported the generation of enhanced views obtained by an acquisition device specifically designed for this work. The proposed approach has been tested on a sample of six representative subjects from the Entomological Collection of the Centro de Biosistemas, Universidad Jorge Tadeo Lozano (Colombia). The resulting point clouds exhibit an overall good visual quality for the body structure the selected specimens, while file sizes are portable enough to support web based visualization.

关键词： Three dimensional computer graphics

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A methodology to handle social media posts in brazilian Portuguese for text mining applications 16

A methodology to handle social media posts in Brazilian Port...

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22nd brazilian symposium on Multimedia and the Web, WebMedia 2016

作者： Júnior, Milton stiilpen De Merschmann, Luiz Henrique C. Federal University of Ouro Preto Ouro Preto Brazil

ISBN: (纸本)9781450345125

Online Social Networks emerged at the beginning of 21st century and give us evidence that they are going to have a long life. Almost two-thirds of overall social media users affirm an everyday usage of a social media website and, therefore, the data volume across this platforms is huge. Natural language processing of social media texts is an attractive topic among researchers of this area. While there are many studies about natural language processing of social media texts for some languages (e.g., English), the researches for brazilian Portuguese language are still limited. Then, in this paper, a methodology is proposed to deal with peculiarities of the brazilian Portuguese language in informal, short and noisy texts, where the lack of context poses obstacles in text mining. The proposed methodology has been evaluated in two tasks (Text Categorization and Opinion Mining) and experiments showed that the preprocessing mechanisms included in this methodology were important to achieve better results. © 2016 ACM.

关键词： Social networking (online)

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Human features extraction by using anatomical and low level image descriptors from whole body images 21

Human features extraction by using anatomical and low level ...

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21st symposium on Signal processing, images and Artificial Vision (stSIVA)

作者： Munera, Nicolas Alvarez, Charlems Sastoque, Sebastian Iregui, Marcela Univ Mil Nueva Granada Acceder Res Grp Bogota Colombia

ISBN: (纸本)9781509037971

Interaction experience in multimedia systems can be improved by adding personalization. Current applications for building and animating characters to represent real users are typically based on pose and motion detection. For so doing, computer vision algorithms do not exploit the anatomical characteristics of the human body for improving their classification accuracy. This work presents an strategy that considers age-group, body shape and height estimation by using anatomical low level descriptors. The proposed strategy allows to differentiate children from adults, and under-weighted and normal body shaped from over-weighted individuals, based on a set of features extracted from full body images and a classification process based on Support Vector Machine (SVM). These classification models were evaluated using a 10-fold cross validation, obtaining an area under the ROC curve of 89 % and 92 % respectively for age-group and body shape. On the other hand, the height of a person was computed by using a reference image in a leave-one-out evaluation and, in comparison with the real one, an square error (MSE) of 17 cm was obtained.

关键词： Multimedia systems

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Localized X-Ray Compressive computer Tomography Reconstruction by Designing Measurement Matrix 21

Localized X-Ray Compressive Computer Tomography Reconstructi...

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21st symposium on Signal processing, images and Artificial Vision (stSIVA)

作者： Lopez, Lizeth Espitia, Oscar Arguello, Henry Univ Ind Santander Bucaramanga Santander Colombia

ISBN: (纸本)9781509037971

X-ray computed tomography (CT) is a noninvasive process for acquiring 3D images from the internal structure of an object. Traditionally, the number of samples needed to recover images from X-ray projections is due to the Nyquist criteria. Recently, a sampling protocol based on compressive sampling (CS) theory has been proposed for reducing the number of required samples. The compressive CT system measures coded projections by using coded apertures that can be adjusted to increase the quality of the retrieved information. In areas such as medicine, geology, and industry, there are applications where it is important the high resolution in only specific parts of the scene, and the additional information is ignored. The compressive CT system allows taking more compressive information of some part of the scene by designing the sensing matrix. This work formulates a localized reconstruction approach in compressive CT by downsampling the non-interest regions selectively and designing the coded apertures for ensuring a uniform sampling for the regions of interest. This process decreases the number of samples required to reconstruct all the data with a high resolution and to preserve a high quality only in the regions of interest. Simulation results, of real and synthetic data, show that the reconstruction algorithms based on CS theory allow the CT images reconstruction for selectively subsampled data and the regions of interest reconstructions have comparable quality to traditional results without selectivity.

关键词： Compressed sensing

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A Real-time webcam based Eye Ball Tracking System using MATLAB 21

A Real-time webcam based Eye Ball Tracking System using MATL...

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21st IEEE International symposium for Design and Technology in Electronic Packaging (SIITME)

作者： Mazhar, Osama Khan, Muhammad Ahmed Shah, Taimoor Ali Tehami, Sameed Univ Burgundy Comp Vis & Robot Burgundy France Tech Hsch Ingolstadt Elect Engn & Informat Technol Ingolstadt Germany NED Univ Engn & Technol Biomed Engn Karachi Pakistan

ISBN: (纸本)9781509003327

Eye Ball Tracking System is a device which is intended to assist patients that cannot perform any voluntary tasks related to daily life. Patients who only can control their eyes can still communicate with the real-world using the assistive devices like one proposed in this paper. This device provides a human computer interface in order to take decisions based on their eye movement. A real time data stream is captured via webcam that transfers data serially to MATLAB. Then a sequential image processing scheme segments the iris of the eye and calculates the centroid, thereby generating control signal with the help of a reference axis. The control signals are then used to manipulate the position of a motorized platform via USB-microcontroller interface.

关键词： eye tracking pupil detection real-time MATLAB image processing webcam

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Web of things gateway: A performance evaluation 15

Web of things gateway: A performance evaluation

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21st brazilian symposium on Multimedia and the Web, WebMedia 2015

作者： De Andrade, Nailton Almeida, Jeferson Costa, Ramon Andrade, Leandro Pinto, George Prazeres, Cássio Computer Science Department WISER: Web Internet and Intelligent Systems Research Lab Federal University of Bahia Salvador Bahia Brazil

ISBN: (纸本)9781450339599

The Web of Things is a proposal to make physical and connected devices available to be used as resources in the development of Web applications through the Web protocols and standards. On the one hand, the current Web has virtual content, which is accessed by client applications that are hosted on Web servers, but on the other hand, the physical devices are real objects that are geographically distributed and have several different ways of communication. As a result of these two before-mentioned characteristics, the physical devices would demand a larger number of Web servers. In this context, this work proposes that devices with limited memory capacity and processing power can be used as Web of Things gateways through Web protocols. Then, performance evaluation of such limited device is presented in this paper with two evaluation objectives: To evaluate the feasibility of a limited device as a Web of Things gateway;to establish the capacity of the gateway in management the access to the physical devices. © 2015 ACM.

关键词： Internet of things

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An Algorithm for the Automatic Detection of Abnormal Mitotic Figure towards the Automated Diagnosis of Melanoma 21

An Algorithm for the Automatic Detection of Abnormal Mitotic...

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21st International Congress on Modelling and Simulation (MODSIM) held jointly with the 23rd National Conference of the Australian-Society-for-Operations-Research / DstO led Defence Operations Research symposium (DORS

作者： Anvar, Amir Parsa Shi, Peng Lim, Cheng-Chew Univ Adelaide Sch Elect & Elect Engn Adelaide SA 5005 Australia

ISBN: (纸本)9780987214355

Histopathology is a recognised technique for the detection of melanoma, and is often referred to as the 'Gold standard' for the detection of this disease. However, its results can sometimes be rendered inconclusive, hence demanding the need for further, more advanced, forms of testing to be conducted (e.g., FISH testing and comparative genomic hybridisation (CGH)). In order to support pathologists with the detection of melanoma, an algorithm has been proposed for the detection of abnormal mitotic figure;a feature of melanoma that is a key indicator of malignancy. It is anticipated that this work can contribute towards research and development in the area of automated histopathological detection of melanoma. The proposed algorithm is described here as a flow diagram. It is currently undergoing further improvement, and it will then be implemented in computer code and tested.

关键词： Histopathology automated abnormal mitotic figure detection algorithm computerised image processing

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A real-time webcam based Eye Ball Tracking System using MATLAB

A real-time webcam based Eye Ball Tracking System using MATL...

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International symposium for Design and Technology of Electronics Packages (SIITME)

作者： Osama Mazhar Taimoor Ali Shah Muhammad Ahmed Khan Sameed Tehami Computer Vision and Robotics University of Burgundy Burgundy France Electrical Engineering & Information Technology Technische Hochschule Ingolstadt Ingolstadt Germany Biomedical Engineering NED University of Engineering & Technology Karachi Pakistan

关键词： image processing MATLAB Gaze tracking Webcams Microcontrollers Real-time systems computers

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Demo abstract: Taming many heterogeneous cores

Demo abstract: Taming many heterogeneous cores

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IEEE symposium on Real-Time and Embedded Technology and Applications

作者： Nils Asmussen Marcus Volp Benedikt Nothen Annett Ungethum Technische Universität Dresden Dresden Germany

Many-core systems are increasingly used in real-time settings to meet the performance requirements of advanced applications such as the classification and tracking of dynamic objects for autonomous driving [1] or the generation of safe trajectories through rough terrain [2]. Task sets of these applications are often mixtures of short running, low latency tasks, such as the various filtering steps required for signal or image processing, and long running tasks, such as route planning, which occupy their assigned core for extended periods of time. Short running tasks often follow a data flow programming paradigm and are organized into directed acyclic graphs (DAG) based on their input-/output-dependencies. Once these dependencies are met, they execute without further task interactions until they complete producing outputs for subsequent tasks. Long running tasks on the other hand interact frequently with other tasks, accessing data located in the memories of remote cores or interacting with operating-system services. This demonstrator shows how both types of applications can be integrated into a single many-core architecture.

关键词： computer architecture Real-time systems Trajectory Digital signal processing Kernel Hardware Mobile robots

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