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检索条件"任意字段=14th Brazilian Symposium on Computer Graphics and Image Processing"

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thoughts and emotion assimilation and detonation through VR for people with ASD 14

Thoughts and emotion assimilation and detonation through VR ...

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14th International symposium on Medical Information processing and Analysis

作者： Hernandez-Mosti, Juan P. Canete Alavez, Mariela Vaillard Martinez, Judith Reza Becerril, Diego Moya-Albor, Ernesto Brieva, Jorge Univ Panamer Fac Ingn Augusto Rodin 498 Mexico City 03920 DF Mexico Domus Inst Autismo AC Malaga 44 Mexico City 03920 DF Mexico

ISBN: (数字)9781510626065

ISBN: (纸本)9781510626065

this study proposes a new tool based on Virtual Reality (VR) as a complement in the treatment of people diagnosed with Autism Spectrum Disorder (ASD). VR tools have been stablished in last years as a new option in learning and practising new skills during the treatment. In this work, a VR application is developed simulating several environments corresponding to different types of emotions according to the Gestalt school of psychology. the VR application was tested in five male teenagers diagnosed with ASD of level one according to the DSM-5 during the therapy sessions. A qualitative evaluation of the VR application is carried out by the therapist during the session. It is observed and annotated which emotions have been detonated by the VR application giving to the therapist new information for the subsequent sessions.

关键词： Autism Spectrum Disorder computer graphics Virtual Reality thoughts Emotions

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Ray-Traced Reflections in Real-Time Using Heuristic Based Hybrid Rendering 13

Ray-Traced Reflections in Real-Time Using Heuristic Based Hy...

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13th brazilian symposium on computer Games and Digital Entertainment (SBGAMES)

作者： Andrade, Paulo Sabino, thales Clua, Esteban Pagliosa, Paulo Univ Fed Fluminense Inst Comp Medialab Niteroi RJ Brazil Pontificia Univ Catolica Estado Rio De Janeiro Tecgraf Rio De Janeiro Brazil Univ Fed Mato Grosso do Sul FACOM Campo Grande Brazil

ISBN: (纸本)9781479980659

Game engines typically use cube maps or screen space local reflections for simulating reflections effects at the real-time renderer pipeline. While these techniques work in many situations, they cannot deal well with reflections of reflections, reflections from covered spaces, reflections from elements outside the screen space or reflections from elements that change its shape or position in real-time. In this paper, we present a method capable of creating true real-time ray-traced reflections by using a heuristic based method and a hybrid renderer. Our solution maintain real-time frame rates by selecting, for each frame, the best reflexive surfaces to ray trace, based on the users point of view.

关键词： computer graphics ray-tracing parallel processing image generation

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Fluid simulation on surfaces in the GPU

Fluid simulation on surfaces in the GPU

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25th Conference on graphics, Patterns and images, SIBGRAPI 2012

作者： Carvalho, Leonardo Andrade, Maria Velho, Luiz IMPA Rio de Janeiro Brazil UFAL Maceió Brazil

ISBN: (纸本)9780769548296

In this paper we present a method to simulate fluids on smooth surfaces of arbitrary topology using a graphics processing unit (GPU). To do this we use the parametrization of Cat mull-Clark subdivision surfaces and obtain the metric information of the distortion caused by this parametrization, so we can calculate differential operators of functions defined on this surface. then the Navier-Stokes equations on surfaces are solved in the domain of parametrization of each patch. this process can be done in parallel for each point in the discretization of the surface, so the GPU implementation can heavily increase the velocity of computation. © 2012 IEEE.

关键词： graphics processing unit

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A boundary extraction approach based on multi-resolution methods and the T-snakes framework 13

A boundary extraction approach based on multi-resolution met...

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13th brazilian symposium on computer graphics and image processing, SIBGRAPI 2000

作者： Giraldi, Gilson A. Strauss, Edilberto Oliveira, Antonio A.F. Federal University of Rio de Janeiro Computer Graphics Laboratory COPPE Mail Box 68511 Rio de Janeiro RJCEP 21945-970 Brazil COPPE Mail Box 68511 Rio de Janeiro RJCEP 21945-970 Brazil

ISBN: (纸本)0769508782

In this paper we present a new approach which integrates the T-Snakes model and a multi-resolution method in a unified framework for segmentation and boundary extraction. In a first stage, a local scale property of the objects is used to define a triangulation of the image domain and a sampling (coarsest resolution) of the image field. the low resolution image is threshold to get a 0-1 field which is processed by a simple continuation method to generate polygonal curves whose interior contain the desired objects. If the polygonal curve envoi ves more than one object, then the resolution is increased in that region and the method will be applied again. this stage gives a rough approximation of the desired boundaries which will be improved by the T-Snakes to get the final result. We demonstrate the method for 2D medical imaging in the experimental results and indicate how it can be extended to 3D in the future works. © 2000 IEEE.

关键词： Medical imaging

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Reconstruction-diffusion: An improved maximum entropy reconstruction algorithm based on the robust anisotropic diffusion

Reconstruction-diffusion: An improved maximum entropy recons...

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SIBGRAPI 2005: 18th brazilian symposium on computer graphics and image processing - Conference Proceedings

作者： Bustos, Harold I. A. Hae, Yong Kim UFRN Universidade Federal do Rio Grande do Norte Dept. Eng. Computação e Automação Natal RN Brazil USP Universidade de São Paulo Escola Politecnica Dept. de Sistemas Eletrônicos São Paulo SP Brazil

ISBN: (纸本)0769523897

Maximum entropy (MENT) is a well-known image reconstruction algorithm. If only a small amount of acquisition data is available, this algorithm converges to a noisy and blurry image. We propose an improvement to this algorithm that consists on applying alternately the MENT reconstruction and the robust anisotropic diffusion (RAD). We have tested this idea for the reconstruction from full-angle parallel acquisition data, but the idea can be applied to any data acquisition scenario. the new technique has yielded surprisingly clear images with sharp edges even using extremely small amount of projection data. © 2005 IEEE.

关键词： image reconstruction

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Towards 3D reconstruction of endoscope images using shape from Shading 13

Towards 3D reconstruction of endoscope images using shape fr...

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13th brazilian symposium on computer graphics and image processing, SIBGRAPI 2000

作者： Forster, Carlos Henrique Quartucci Tozzi, Clésio L. Dept. of Computer Engineering and Industrial Automation - DCA School of Electrical and Computer Engineering - FEEC State University of Campinas - UNICAMP C.P. 6101 Campinas SP13083-970 Brazil

ISBN: (纸本)0769508782

the 3D Reconstruction problem from a single endoscope image of a smooth object is studied in the context of the Shape from Shading methods and considering a single light source at the camera projection center. Based on a curve expansion Shape from Shading algorithm, a spherical projection model for the endoscope camera and a dichromatic model for the surface reflectance, an approach to solve practical problems, namely the endoscope image distortion and the removal of the image specular reflection component, is presented. Results obtained from application of this approach to synthetic and real images are presented. © 2000 IEEE.

关键词： Endoscopy

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Reduction of interband correlation for landsat image compression

Reduction of interband correlation for landsat image compres...

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SIBGRAPI 2005: 18th brazilian symposium on computer graphics and image processing - Conference Proceedings

作者： Acevedo, Daniel G. Ruedin, Ana M. C. Departamento de Computatión Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires

ISBN: (纸本)0769523897

We present a lossless compressor for multispectral images that exploits interband correlations. Each band is divided into blocks, to which a wavelet transform is applied. the wavelet coefficients are predicted by means of a linear combination of coefficients belonging to the same orientation and spatial location. the prediction errors are then encoded with an entropy - based coder. Our original contributions are i) the inclusion, among the candidates for prediction, of coefficients of the same location from other spectral bands, ii) the calculation of weights tuned to the landscape being processed, iii) a fast block classification and a different band-ordering for each landscape. Our compressor reduces the size of an image to about a fourth of its original size. Our method is equivalent to LOCO-I, on 3 of the images tested it was superior. It is superior to other lossless compressors: WinZip, JPEG2000 and PNG. © 2005 IEEE.

关键词： image compression

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image data fusion using projection over the set of solutions of an underdetermined least squares problem 12

Image data fusion using projection over the set of solutions...

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12th brazilian symposium on computer graphics and lmage processing, SIBGRAPI 1999

作者： Zaniboni, G.T. Mascarenhas, N.D.A. Universidade Federal de São Carlos Departamento de Computação Caixa Postal 676 São Carlos SP13565-905 Brazil INPE Av. dos Astronautas 1758 CP 515 São José dos Campos SP12201-970 Brazil

ISBN: (纸本)0769504817

this paper presents a new image data fusion method that aims to combine images with different spatial and spectral resolutions. It is based on a projection onto the subspace of the set of solutions of an underdetermined least squares problem. the data fusion problem may also involve an interpolation process, when images with different spatial resolutions are used. In our case, this interpolation was performed by using a Bayesian approach, with or without spatial adaptation. As an example, the method is applied to SPOT images over Sao Jose dos Campos, SP, Brazil. © 1999 IEEE.

关键词： Interpolation

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Color image gradients for morphological segmentation 13

Color image gradients for morphological segmentation

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13th brazilian symposium on computer graphics and image processing, SIBGRAPI 2000

作者： Hirata, Roberto Flores, Franklin César Barrera, Junior Lotufo, Roberto A. Meyer, Fernand Instituto de Matemática e Estatística USP PO Box 66.281 São Paulo - SP05315-970 Brazil Faculty of Electrical and Computer Engineering UNICAMP PO Box 6101 Campinas - SP13081-970 Brazil Centre de Morphologie Mathématique École des Mines de Paris 35 rue St. Honore Fontainebleu77305 France

this paper proposes an approach for color segmentation which is an alternative to the search of a total order in the color space. Instead of looking for a total order, we look for a suitable metric that defines a colo... 详细信息

ISBN: (纸本)0769508782

关键词： Color

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Towards robotic cognition using deep neural network applied in a goalkeeper robot 14

Towards robotic cognition using deep neural network applied ...

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14th Latin American Robotics symposium and 5th brazilian symposium on Robotics, LARS-SBR 2017

作者： Da Silva, Isaac Jesus Vilao, Claudio O. Costa, Anna H.R. Bianchi, Reinaldo A.C. University Center FEI of Electrical Engineering and Computer Science Sao Bernardo Do Campo Sao Paulo Brazil Escola Politecnica da Universidade de Sao Paulo Sao Paulo Brazil

ISBN: (纸本)9781538609569

Developing a vision system combined with a decision system for a humanoid robot, capable of playing soccer in the RoboCup domain, has been proved to be a challenging task. the computational limitations imposed by a embedded computer inside the robot and special conditions, such as the use of colored objects, led teams to use techniques based on color segmentation for vision and conditional statements for decision. However, the current league trend is to insert the robots into more and more realistic environments. this will require the robot to, given an image provided by its camera, to abstract all the information it needs to make a decision regardless of the environment. Most robotic vision systems at RoboCup relies on traditional computer vision techniques: thresholding;windowing;segmentation;and classification that requires hours of labeling to training and testing. this paper proposes a system that does not require to locate objects coordinates in the image - a deep neural network will identify most important features resulting as an output that is a decision. Results show that Deep Neural Network (DNNs) enabled the system to be more simple, robust (with less parameters to be set by hand) and achieved a performance that is compatible with the dynamics of the humanoid robot soccer. this system was tested in a real robot and simulator. © 2017 IEEE.

关键词： Anthropomorphic robots

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