this paper presents a novel image-based approach to render plausible soft shadows for complex dynamic scenes with rectangular light sources. the algorithm's performance is mostly independent of the scene complexit...
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ISBN:
(纸本)0769526861
this paper presents a novel image-based approach to render plausible soft shadows for complex dynamic scenes with rectangular light sources. the algorithm's performance is mostly independent of the scene complexity and the source's size. Occluders and receivers do not need to be separated and no knowledge about the scene representation is required, making the method easy to use. the main idea is to approximate the occlusion in the scene with pre-filtered occlusion textures. the visibility of the light source at a point in space is estimated by accumulating the occlusion caused by each texture, using a novel formula based on probabilities.
this paper describes the current state of research and development of a system for the partial automation of quantitative Funduscopy. imageprocessing techniques are used to segment the optic disk and estimate the par...
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ISBN:
(纸本)076951846X
this paper describes the current state of research and development of a system for the partial automation of quantitative Funduscopy. imageprocessing techniques are used to segment the optic disk and estimate the parameters of the circumference associated with it. the global objective is to facilitate the diagnosis of pathologies like Systemic Arterial Hypertension and Diabetes Mellitus.
In this work, we introduce a new scheme to extract hierarchical isocontours from regular and irregular 2D sampled data and to encode it at single rate or progressively. A dynamic tessellation is used to represent and ...
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In this work, we introduce a new scheme to extract hierarchical isocontours from regular and irregular 2D sampled data and to encode it at single rate or progressively. A dynamic tessellation is used to represent and adapt the 2D data to the isocontour. this adaptation induces a controlled multi-resolution representation of the isocontour. this representation can then be encoded while controlling the geometry and topology of the decoded isocontour. the resulting algorithms form an efficient and flexible isocontour extraction and compression scheme. (c) 2006 Elsevier Ltd. All rights reserved.
In imageprocessing, one of the most efficient techniques for image segmentation is entropy-based thresholding. In this work it was applied a generalized entropy formalism that represents a recent development in stati...
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ISBN:
(纸本)076951846X
In imageprocessing, one of the most efficient techniques for image segmentation is entropy-based thresholding. In this work it was applied a generalized entropy formalism that represents a recent development in statistical mechanics. We propose, for the first time, an imagethresholding method using a nonextensive entropy regarding the presence of nonadditive information content in some image classes. Preliminary results are shown.
Region-based approaches to cel painting typically use shape similarity and topology relations between regions of consecutive animation frames. this paper presents a new colorization algorithm based on topological diff...
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ISBN:
(纸本)0769526861
Region-based approaches to cel painting typically use shape similarity and topology relations between regions of consecutive animation frames. this paper presents a new colorization algorithm based on topological differences defined over a hierarchical graph of adjacent regions, which allows an almost full automatic colorization process. Also this paper discusses other attributes that improve the solution of the image association problem.
this paper reports some issues involved in the construction of an interactive, interoperable application, whose primary purpose is to be used as a virtual mockup. this graphic tool was tailored for machine vision appl...
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ISBN:
(纸本)0769520324
this paper reports some issues involved in the construction of an interactive, interoperable application, whose primary purpose is to be used as a virtual mockup. this graphic tool was tailored for machine vision application prototyping, to cope with metrological settings of large part assemblies. Some relevant aspects of designing interactive 3D applications will be discussed, including an account of some modem graphics libraries, particularly Java 3D. the achieved results, including some interesting byproducts of this work, to be publicly distributed soon, are also presented.
this paper presents a preliminary laboratory study which analyzed an oil spill experiment from the interaction of resultant digital images and analytical techniques, as quantifying oil slick growth into two orthogonal...
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ISBN:
(纸本)076951846X
this paper presents a preliminary laboratory study which analyzed an oil spill experiment from the interaction of resultant digital images and analytical techniques, as quantifying oil slick growth into two orthogonal directions.
Deformable models are a powerful tool in bothcomputergraphics and computer vision. the description and implementation of the deformations have to be simultaneously flexible and powerful, otherwise the technique may ...
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ISBN:
(纸本)0769522270
Deformable models are a powerful tool in bothcomputergraphics and computer vision. the description and implementation of the deformations have to be simultaneously flexible and powerful, otherwise the technique may not satisfy the requirements of all the distinct applications. In this paper we introduce a new method for deformable model specification: deformable fields. Deformable fields are conceptually simple, lead to an easy implementation, and are suitable for adaptive models. We apply our new technique to describe an adaptive deformable face, and compare three different adaptation strategies. Additionally, we show how our technique is suitable to describe different individuals.
this work presents an architecture for real-time visualization, which is able to render a set of 3D objects by using the CPU idle time. the objects being rendered are sent to the graphics pipeline as relief impostors....
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ISBN:
(纸本)0769522270
this work presents an architecture for real-time visualization, which is able to render a set of 3D objects by using the CPU idle time. the objects being rendered are sent to the graphics pipeline as relief impostors. their depth maps are used to apply 3D image-warping operations in order to prolong the life cycle of the synthesized images. While an image is within the graphics pipeline the CPU idle time is used to generate additional necessary images. Withthis method, it is possible to render images with special illumination models and effects that are impossible or unsuitable to be implemented withthe shaders of the available graphics cards.
Medical image registration is a difficult problem. Not only a registration algorithm needs to capture both large and small scale image deformations, it also has to deal with global and local image intensity variations...
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ISBN:
(纸本)9780769529967
Medical image registration is a difficult problem. Not only a registration algorithm needs to capture both large and small scale image deformations, it also has to deal with global and local image intensity variations. In this paper we describe a new multiresolution elastic image registration method that challenges these difficulties in image registration. To capture large and small scale image deformations, we use both global and local affine transformation algorithms. To address global and local image intensity variations, we apply an image intensity standardization algorithm to correct image intensity variations. this transforms image intensities into a standard intensity scale, which allows highly accurate registration of medical images.
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