Microprocessors with built-in Liquid Crystal Device (LCD) controllers and equipped with Flash memory are common in mobile computing applications. In the first part of the paper, a software-only encoding technique is p...
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ISBN:
(纸本)0769514413
Microprocessors with built-in Liquid Crystal Device (LCD) controllers and equipped with Flash memory are common in mobile computing applications. In the first part of the paper, a software-only encoding technique is proposed to reduce the power consumption of the processor-memory bus when displaying an image on the LCD. Based on the translation mechanism of the LCD controller, our approach is to start with the palette as a coding table for the pixel buffer and then reassign the codes according to the image characteristics. Experimental results prove the efficacy of this approach; power reduction reaches 29% for text-based and 17% for graphics-based images. In the second part of the paper, another software-only encoding technique is presented to reduce the transitions on the processor CompactFlash bus. The device driver in Linux operating system is modified to perform Bus-Invert encoding when the data is read from or written to a Compact Flash file system. With minimal software overhead, the transitions on the bus are reduced by up to 25%.
The aim of this paper is to attain a fast and realistic 3D face reconstruction, when only a limited set of images taken from multiple views, is available. Instead of relying merely on 2D images as suggested by image-b...
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The aim of this paper is to attain a fast and realistic 3D face reconstruction, when only a limited set of images taken from multiple views, is available. Instead of relying merely on 2D images as suggested by image-based modeling approaches, we investigate several shape-from-shading (SFS) techniques, which have been studied extensively in computer vision research. This is because we believe that a nearly complete set of images required by image-based modeling techniques is rarely available in real world applications. In this paper, we investigate the effectiveness of three different SFS algorithms to provide partial 3D shapes of the face to be reconstructed. Each algorithm is selected from three different classes of SFS technique, i.e., linear, propagation, and minimization approaches. The reconstruction process is performed by our novel neural network learning scheme, which is able to successively refine the polygon vertices parameter of an initial 3D shape, based on depth maps of several calibrated images. To evaluate the reconstruction result based on those SFS techniques, we measure average vertex-error and pixel-error compared to actual 3D data obtained by 3D scanner device. We also compared these result with those obtained by using only 2D images. In addition, we also measure total computational time needed in the reconstruction process.
The proceedings contain 33 papers. The topics discussed include: creating a precise panorama from panned video sequence images;automatic camera placement for image-based modeling;automatic creation of object hierarchi...
ISBN:
(纸本)0769502938
The proceedings contain 33 papers. The topics discussed include: creating a precise panorama from panned video sequence images;automatic camera placement for image-based modeling;automatic creation of object hierarchies for radiosity clustering;a speech driven talking head system based on a single face image;motion generator approach to translating human motion from video to animation;output sensitive extraction of silhouettes from polygonal geometry;exact computation of 4-D convex hulls with perturbation and acceleration;a scan line algorithm for rendering curved tubular objects;opportunities for subdivision-based multiresolution modeling;and wavelet based 3D compression with fast random access for very large volume data.
This paper describes a method for modeling the natural peeling phenomenon over any 3D surface. Using crack input data-precomputed with a semi-physical solution-this method allows simulating peeling on any type of tria...
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ISBN:
(纸本)0769512275
This paper describes a method for modeling the natural peeling phenomenon over any 3D surface. Using crack input data-precomputed with a semi-physical solution-this method allows simulating peeling on any type of triangulated 3D object. Our model's main advantage is that it proposes an method that is intuitive enough to make it easy to understand and convenient to apply, user controllable, and easily extensible-especially to simultaneous natural phenomena We first introduce the general development of peeling over various materials. Then, we present how to define groups of peeling, how to determine a realistic and natural peeling order and how to simulate the rendering of two types of special peelings. Finally, a set of graphical results concludes the paper presenting a series of direct peeling and curling patterns using classical paintings or plastic-paintings simulated materials.
3D graphics is becoming an important application area together with multimedia applications. The dynamic behavior of 3D graphics application brings new challenges for system level specification and synthesis methodolo...
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ISBN:
(纸本)0780366336
3D graphics is becoming an important application area together with multimedia applications. The dynamic behavior of 3D graphics application brings new challenges for system level specification and synthesis methodologies. Although existing dataflow models are successfully used for DSP system design, they are not sufficient to deal with 3D graphics algorithms since they lack in global state management and dynamic behavior handling, In this paper, we propose an extended synchronous piggybacked dataflow model with dynamic constructs for representing 3D graphics algorithm. We also present implementation techniques for software and hardware synthesis from the specification. With a simple 3D graphics pipeline, we show the novelty and usefulness of the proposed specification model.
In this paper, we present a method to animate human face under arbitrary lighting condition. We first acquire the reflectance models of a human face in various expressions by employing a robot to precisely control lig...
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This paper presents a new method for modeling the structure of sea anemones and sea stars. Two specific invertebrates, the sea anemone, Stomphia coccinea and the sea star, Dermasterias imbricata were modeled using hie...
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A deformation-based fine tuning technique for parametric curves and surfaces is presented. A curve or surface is deformed by scaling its derivative, instead of manipulating its control points. Since only the norm of t...
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In this paper we propose a new mesh reconstruction algorithm that produces a displaced subdivision mesh directly from unorganized points. The displaced subdivision surface is a new mesh representation that defines a d...
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