Image Processing Digital Techniques
Mostrando 13-24 de 86 artigos, teses e dissertações.
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13. Sistema de alto desempenho para compressão sem perdas de imagens mamográficas
The usage of mammographic image databases in digital form and the practice of telemedicine require to store and to transmit large amounts of data. The image digitization from a single mammographic exam with appropriate resolution can take up to 120MB of space in disk, which becomes even more critical when considering the large number of exams per day on a cl
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/04/2010
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14. Study of morphology of ceramic foams / Estudo da morfologia de espumas cerâmicas
In this work will present the results obtained with quantification of parameters by means of histomorphometry techniques of ceramic foam samples. This quantification was done by means of two-dimensional image analysis techniques from image processing. The images analyzed in this work were obtained by scanning the faces of the samples using a conventional sca
Publicado em: 2010
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15. Uma proposta de estimação de movimento para o codificador de vídeo Dirac / A proposal of motion estimation for Dirac video codec
The main purpose of this work is to design a new algorithm which enhance motion estimation in Dirac video codec. Motion estimation is a critical stage in video coding, in which most of the processing lies. Dirac codec, recently released, is based on techniques different from the usually employed (as in MPEG-based codecs). Dirac video codec aims at achieving
Publicado em: 2010
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16. Classifiers and machine learning techniques for image processing and computer vision / Classificadores e aprendizado em processamento de imagens e visão computacional
In this work, we propose the use of classifiers and machine learning techniques to extract useful information from data sets (e.g., images) to solve important problems in Image Processing and Computer Vision. We are particularly interested in: two and multi-class image categorization, hidden messages detection, discrimination among natural and forged images,
Publicado em: 2009
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17. Desenvolvimento de descritores de imagens para reconhecimento de padrões de plantas invasoras (folhas largas e folhas estreitas)
In Brazil, the development of tools for weeds recognition, capable of aiding risk detection and decision making on the fieldwork is still embryonic. This masters thesis presents the development of a pattern recognition system that recognizes weeds and gives the occupation percentage of wide and narrow leaves in an agricultural production system, with digital
Publicado em: 2009
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18. GeraÃÃo e avaliaÃÃo de artefatos em vÃdeo digital / Generation and evaluation of artifacts in digital video
Este trabalho teve como objetivo o estudo e a criaÃÃo controlada de artefatos em vÃdeo digital e a sua mensuraÃÃo com o emprego de mÃtricas objetivas. Foram criados artefatos do tipo ruÃdo branco gaussiano, sal e pimenta, borramento, blocagem e travamento. Para avaliaÃÃo de seu impacto no vÃdeo digital foram utilizadas as mÃtricas MSE (Mean Square
Publicado em: 2009
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19. Experimental methodology for the obtaining of the hydrodynamic parameters of VSNT JAHU II, based in digital image processing. / Metodologia experimental para obtenção dos parâmetros hidrodinâmicos do VSNT JAHU II, baseado em processamento digital de imagens.
Unmanned underwater vehicles they have been used continually by the planet in spite of the difficulties of your operation, both for scientific observation, but also for monitoring of engineering works. The positions of these vehicles are controlled, in general, which makes manually they work long and tiring to their pilots. An alternative that simplifies thi
Publicado em: 2009
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20. Impacto da utilização de tecnicas de lifting explorando diferença entre ferramentas interpretada e compilada na velocidade computacional da codificação wavelet de imagens estaticas / Impact of using lifting techniques to explore the differences between interpreted and compiled tools in the computational speed of wavelet static image coding
The field of analysis and compression of images has been received special attention of the scientific community because of including in the main systems of digital TV, satellite communications and mobile communications. In this context, the Discrete Transform Wavelet (TWD) arise how a powerful tool and its many advantages allowed your insertion in important
Publicado em: 2009
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21. Mistura de cores: uma nova abordagem para processamento de cores e sua aplicação na segmentação de imagens / Colors mixture: a new approach for color processing and its application in image segmentation
Inspired on the techniques used by painters to overlap layers of various hues of paint to create oil paintings, and also on observations of the distribution of cones in human retina for the interpretation of these colors, this thesis proposes an image processing technique based on color mixing. This is a static color quantization method that expresses the mi
Publicado em: 2009
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22. Segmentação de tumores de encéfalo em imagens por ressonância magnética baseada em informações texturais. / Brain tumor segmentation in magnetic resonance images based on texture information.
Magnetic resonance images are essential in the diagnosing and treatment of brain tumors due to its high amount of anatomic details. The task of segmenting brain tumor regions in these images makes more exact quantitative analysis feasible, allowing a better tracking of the evolution/regression of the disease. Nevertheless, the execution of such task is burde
Publicado em: 2009
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23. Unsupervised methods of classifying remotely sensed imges using Kohonen self-organizing maps / Metodos de classificação não-supervisionada de imagens de sensoriamento remoto usando mapas auto-organizaveis de Kohonen
This thesis proposes new methods of unsupervised classification for remotely sensed images which particularly exploit the characteristics and properties of the Kohonen Self-Organizing Map (SOM). The key point is to execute the clustering process through a set of prototypes of SOM instead of analyzing directly the original patterns of the image. This strategy
Publicado em: 2009
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24. Reconhecimento de objetos em imagens digitais utilizando otimizaÃÃo por enxame de partÃculas / Object recognition in digital images using particle swarm optimization
The automatic recognition of objects aims to extract the visual information by computional devices. One way of addressing the problem of object recognition is through the technique of Template Matching viewed as a problem of global optimization. The objective is to determine the position of an object in an image, its rotation angle and the scale factor used.
Publicado em: 2009