This paper describes a virtual endoscopic system designed for non-invasive bronchoscopy. This system uses computergraphics techniques to navigate inside the bronchial tree. Using these techniques, we can avoid invasi...
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This paper describes a virtual endoscopic system designed for non-invasive bronchoscopy. This system uses computergraphics techniques to navigate inside the bronchial tree. Using these techniques, we can avoid invasive procedures such as conventional bronchoscopy in those cases where biopsy is not required.
The paper presents our research in imageprocessing (filters used for edge detection, color transformation, and distortion correction) using artificial neural networks. We have developed a tool, Neuron Color, in order...
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The paper presents our research in imageprocessing (filters used for edge detection, color transformation, and distortion correction) using artificial neural networks. We have developed a tool, Neuron Color, in order to carry out these experiments and improving our adaptive methods.
This paper discusses an ongoing project for hand gesture recognition in computer vision systems. The proposed approach is based on the shape analysis tools introduced by R.M. Cesar Jr. and L. da F. Costa (1997). More ...
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This paper discusses an ongoing project for hand gesture recognition in computer vision systems. The proposed approach is based on the shape analysis tools introduced by R.M. Cesar Jr. and L. da F. Costa (1997). More specifically, the wavelet transform is used to generate features for the recognition of hand gestures based on contours.
This work describes PhotoPixJ 2.0, a system for integration and execution of digital imageprocessing algorithms. PhotoPixJ 2.0 is the migration of the Java 1.0 based PhotoPixJ to Java 2 platform. It provides a multi-...
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This work describes PhotoPixJ 2.0, a system for integration and execution of digital imageprocessing algorithms. PhotoPixJ 2.0 is the migration of the Java 1.0 based PhotoPixJ to Java 2 platform. It provides a multi-platform easy to use framework to implement image types, processing and formats. The system presents the application and the applet versions. The use of PhotoPixJ 2.0 enables a great productivity gain for DIP algorithms developers, in the implementation of not only algorithms but also non-essential functionality.
Because of their storage conditions, old movies may present different defect types of different shapes and sizes. We propose a method for old movie restoration using opening by surface which eliminates image informati...
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Because of their storage conditions, old movies may present different defect types of different shapes and sizes. We propose a method for old movie restoration using opening by surface which eliminates image information by area attribute, independent of the shape of its components.
The algorithm radial flow model can generate a 3D closed triangular mesh which fits an unregistered range image. Though complex meshes may be produced, they are restricted to be homeomorph to spheres. We present some ...
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The algorithm radial flow model can generate a 3D closed triangular mesh which fits an unregistered range image. Though complex meshes may be produced, they are restricted to be homeomorph to spheres. We present some ideas that may overcome this constraint.
Studies the advantages and disadvantages of fractal image compression (FlC) compared to wavelet transform compression (WTC). Our results indicate that there is an advantage in FIC for high compression ratios when we t...
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Studies the advantages and disadvantages of fractal image compression (FlC) compared to wavelet transform compression (WTC). Our results indicate that there is an advantage in FIC for high compression ratios when we take the image quality into account. Considering the compression speed we have a significant difference, which indicates that WTC is much faster than FIC.
The paper presents a simple and robust algorithm for estimating the local geometric properties of intersection curves, namely the tangent, normal, binormal, curvature and torsion vectors at any point. In addition, two...
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The paper presents a simple and robust algorithm for estimating the local geometric properties of intersection curves, namely the tangent, normal, binormal, curvature and torsion vectors at any point. In addition, two new marching directions that make use of these properties are given.
We introduce variable resolution 4-k meshes, a powerful structure for the representation of geometric objects at multiple levels of detail. It combines most properties of other related descriptions with several advant...
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We introduce variable resolution 4-k meshes, a powerful structure for the representation of geometric objects at multiple levels of detail. It combines most properties of other related descriptions with several advantages, such as more flexibility and greater expressive power. The main unique feature of the 4-k mesh structure lies in its variable resolution capability, which is crucial for adaptive computation. We also give an overview of the different methods for constructing the hierarchical 4-k mesh representation, as well as the basic algorithms necessary to incorporate it in modeling and graphics applications.
The paper describes the construction process of multiuser virtual environments, VE integrated with multimedia for the virtual teaching of embryology. The system is supported by the MPEG-4 standard and will be integrat...
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The paper describes the construction process of multiuser virtual environments, VE integrated with multimedia for the virtual teaching of embryology. The system is supported by the MPEG-4 standard and will be integrated, as experimentation environments, to a virtual course on embryology, which is being built and will be made available as part of the embryology course for medical students.
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