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Search Results: 1 - 10 of 366 matches for " Aura Conci "
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Fractal coding based on image local fractal dimension
Conci, Aura;Aquino, Felipe R.;
Computational & Applied Mathematics , 2005,
Abstract: fractal codification of images is based on self-similar and self-affine sets. the codification process consists of construction of an operator which will represent the image to be encoded. if a complicated picture can be represented by an operator then it will be transmitted or stored very efficiently. clearly, this has many applications on data compression. the great disadvantage of the automatic form of fractal compression is its encoding time. most of the time spent in construction of such operator is due on finding the best match between parts of the image to be encoded. however, since the conception of automatic fractal image compression, researches on improvement of the compression time are widespread. this work aims to provide a new idea for decrease the encoding time: a classification of image parts based on their local fractal dimension. the idea is implemented on two steps. first, a preprocessing analysis of the image identify the complexity of each image block computing its dimension. then, only parts within the same range of complexity are used for testing the better self-affine pairs, reducing the compression time. the performance of this proposition, is compared with others fractal image compression methods. the points considered are image fidelity, encoding time and amount of compression on the image file.
Fractal coding based on image local fractal dimension
Aura Conci,Felipe R. Aquino
Computational and Applied Mathematics , 2005,
Abstract: Fractal codification of images is based on self-similar and self-affine sets. The codification process consists of construction of an operator which will represent the image to be encoded. If a complicated picture can be represented by an operator then it will be transmitted or stored very efficiently. Clearly, this has many applications on data compression. The great disadvantage of the automatic form of fractal compression is its encoding time. Most of the time spent in construction of such operator is due on finding the best match between parts of the image to be encoded. However, since the conception of automatic fractal image compression, researches on improvement of the compression time are widespread. This work aims to provide a new idea for decrease the encoding time: a classification of image parts based on their local fractal dimension. The idea is implemented on two steps. First, a preprocessing analysis of the image identify the complexity of each image block computing its dimension. Then, only parts within the same range of complexity are used for testing the better self-affine pairs, reducing the compression time. The performance of this proposition, is compared with others fractal image compression methods. The points considered are image fidelity, encoding time and amount of compression on the image file.
Rational Convolution Roots of Isobaric Polynomials
Aura Conci,Huilan Li,Trueman MacHenry
Mathematics , 2014,
Abstract: In this paper, we exhibit two matrix representations of the rational roots of generalized Fibonacci polynomials (GFPs) under convolution product, in terms of determinants and permanents, respectively. The underlying root formulas for GFPs and for weighted isobaric polynomials (WIPs), which appeared in an earlier paper by MacHenry and Tudose, make use of two types of operators. These operators are derived from the generating functions for Stirling numbers of the first kind and second kind. Hence we call them Stirling operators. To construct matrix representations of the roots of GFPs, we use the Stirling operators of the first kind. We give explicit examples to show how the Stirling operators of the second kind appear in the low degree cases for the WIP-roots. As a consequence of the matrix construction, we have matrix representations of multiplicative arithmetic functions under the Dirichlet product into its divisible closure.
Investiga??o para detec??o automática de falhas têxteis
Proen?a, Claudia Belmiro;Conci, Aura;Segenreich, Solly A.;
Journal of the Brazilian Society of Mechanical Sciences , 1999, DOI: 10.1590/S0100-73861999000300011
Abstract: this work presents an application of fractal dimension (fd) and segmentation techniques to automated visual inspection. a system was developed for textile industries and aims at automatic failure detection. the textile industry environment presents particular characteristics in which usual morphological feature extraction cannot be used for visual quality control. basically, the implemented system compares data from digital images; the characteristics of these data depend on the method selected for analysis. two kinds of methods can be used: segmentation and fractal dimension. segmentation techniques were adapted and improved to detect variations of the textile images (indication of defect). the fractal dimension is based on a new efficient algorithm that calculates the image fractal dimension values throughout all range that is between two and three (2 £ fd £ 3). these techniques were compared by their efficiency, accuracy and applicability.
Investiga o para detec o automática de falhas têxteis
Proen?a Claudia Belmiro,Conci Aura,Segenreich Solly A.
Journal of the Brazilian Society of Mechanical Sciences , 1999,
Abstract: Este trabalho apresenta uma aplica o de Dimens o Fractal (DF) e técnicas de segmenta o de imagens na inspe o industrial automática. Foi desenvolvido um sistema para a indústria têxtil objetivando a detec o de defeitos. A indústria têxtil se particulariza por ter um tipo de produ o que torna inviável a utiliza o das técnicas de extra o de características morfológiocas, usualmente empregadas em sistemas de controle de qualidade baseados na vis o. Basicamente o sistema implementado compara dados obtidos de imagens digitalizadas, as características destes dados dependem do método selecionado. Dois tipos de métodos podem ser usados: métodos de segmenta o e dimens o fractal. Para implementa o no sistema, métodos de segmenta o conhecidos foram adaptados e aperfei oados visando a determina o de varia es em uma imagem do tecido (o que caracteriza a existência de uma falha). Na utiliza o da Dimens o Fractal como uma ferramenta para análise de imagens e controle de qualidade utiliza-se um algoritmo que calcula os valores de dimens o fractal de imagens em toda a regi o teoricamente admissível (2 <= DF <= 3). Os vários métodos foram comparados quanto a sua eficiência, precis o e aplicabilidade.
A study of the facial aging - a multidisciplinary approach
Leta Fabiana R.,Pamplona Djenane,Weber Hans I.,Conci Aura
Journal of the Brazilian Society of Mechanical Sciences , 2000,
Abstract: This paper describes a mathematical and graphical model for face aging. It considers the possibility of predicting the aging process by offering an initial quantification of this process as it applies to the face. It is concerned with physical measurements and a general law of time dependence. After measuring and normalizing a photograph of a person, one could predict, with a known amount of error, the appearance of that person at a different age. The technique described has served its purpose successfully, with a representative amount of patient data behaving sufficiently near the general aging curve of each parameter. That model uses a warping technique to emulate the aging changes on the face of women. Frequently the warping methods are based on the interpolation between images or general mathematical functions to calculate the pixel attributes. The implemented process considers the age features of selected parts of a face such as the face outline and the shape of the lips. These age features were obtained by measuring the facial regions of women that have been photographed throughout their lives. The present work is first concerned with discussing a methodology to define the aging parameters that can be measured, and second with representing the age effects graphically.
A study of the facial aging - a multidisciplinary approach
Leta, Fabiana R.;Pamplona, Djenane;Weber, Hans I.;Conci, Aura;Pitanguy, Ivo;
Journal of the Brazilian Society of Mechanical Sciences , 2000, DOI: 10.1590/S0100-73862000000300009
Abstract: this paper describes a mathematical and graphical model for face aging. it considers the possibility of predicting the aging process by offering an initial quantification of this process as it applies to the face. it is concerned with physical measurements and a general law of time dependence. after measuring and normalizing a photograph of a person, one could predict, with a known amount of error, the appearance of that person at a different age. the technique described has served its purpose successfully, with a representative amount of patient data behaving sufficiently near the general aging curve of each parameter. that model uses a warping technique to emulate the aging changes on the face of women. frequently the warping methods are based on the interpolation between images or general mathematical functions to calculate the pixel attributes. the implemented process considers the age features of selected parts of a face such as the face outline and the shape of the lips. these age features were obtained by measuring the facial regions of women that have been photographed throughout their lives. the present work is first concerned with discussing a methodology to define the aging parameters that can be measured, and second with representing the age effects graphically.
Detección de Posición Angular de Embarcaciones, utilizando Técnicas de Visión Computacional y Redes Neurales Artificiales
Mendes,Vilson B; Leta,Fabiana R; Conci,Aura; Gon?alves,Laercio B;
Información tecnológica , 2010, DOI: 10.4067/S0718-07642010000600018
Abstract: this paper presents a system for detecting angular position of targets, using feature extraction techniques in digital imaging and artificial neural networks. military ships images graphically generated by three-dimensional solid modeling software are used. several tests using artificial neural networks applied to the set of geometric features were performed. the results show the important contribution of recognition algorithms in determining the ship angular position, regardless of their distance from the observer. the results encourage future applications for tracking targets using infrared images.
Detección de Posición Angular de Embarcaciones, utilizando Técnicas de Visión Computacional y Redes Neurales Artificiales Target Angular Position Detection using Computer Vision Techniques and Artificial Neural Networks
Vilson B Mendes,Fabiana R Leta,Aura Conci,Laercio B Gon?alves
Información Tecnológica , 2010,
Abstract: Este trabajo presenta un sistema de detección de posición angular de buques, utilizando técnicas de extracción de características en imágenes digitales y redes neurales artificiales. Se utilizan imágenes de embarcaciones militares generadas gráficamente. Se realizaron diferentes pruebas usando redes neuronales artificiales aplicadas al conjunto de características geométricas. Los resultados de las pruebas comprueban la importante contribución de la utilización de algoritmos de reconocimiento en la determinación de posicionamiento angular de embarcaciones, independiente del alejamiento del observador. Los resultados favorecen aplicaciones futuras en el seguimiento de buques (tracking) utilizando imágenes infrarrojas. This paper presents a system for detecting angular position of targets, using feature extraction techniques in digital imaging and artificial neural networks. Military ships images graphically generated by three-dimensional solid modeling software are used. Several tests using artificial neural networks applied to the set of geometric features were performed. The results show the important contribution of recognition algorithms in determining the ship angular position, regardless of their distance from the observer. The results encourage future applications for tracking targets using infrared images.
Resultados percibidos obtenidos por las empresas asociados al uso de las prácticas de alta implicación (HIWP) (perceived results obtained by companies associated to the use of high involvement work practices)
Graziela Conci
WPOM : Working Papers on Operations Management , 2012, DOI: 10.4995/wpom.v3i1.1065
Abstract: El objetivo principal de este artículo es investigar las relaciones entre las prácticas de alta implicación (HIWP) y los resultados percibidos por los mandos de las empresas. En la investigación identificamos los metaanalisis y revisiones de literatura realizados en los últimos 25 a os. Aportamos una revisión de literatura de los artículos publicados en los a os no contenidos en las revisiones anteriores (del 2007 al 2011) y que analizan la asociación de los indicadores de productividad, satisfacción, calidad, competitividad o atención al cliente como resultados de la aplicación de las HIWP. Como principal conclusión podemos indicar que la adopción de las HIWP, en general, aporta resultados positivos a las organizaciones. (The main goal of this article is to investigate the relationships between high involvement work practices (HIWP) and the results perceived by managers of the companies using them. In the research we identify both the meta-analyses and the literature reviews done in the last 25 years. We present a revision of the literature of the articles published in the years not included in the previous revisions (from 2007 to 2011) and that analyze the association of productivity, satisfaction, quality, competitiveness or customer care indicators, as a result of the use of HIWP. As a main conclusion we can show that the adoption of HIWP, in general, contribute with positive results to the organizations).
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