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Software-only bus encoding techniques for an embedded system

Software-only bus encoding techniques for an embedded system

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Asia and South pacific Design Automation conference

作者： Wei-Chung Cheng Jian-Lin Liang M. Pedram Department of EE-Systems University of Southern California Los Angeles CA USA

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%.

关键词： Encoding Embedded system Image coding Microprocessors Liquid crystal devices Flash memory Mobile computing computer applications Application software Energy consumption

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Analysis of shape from shading algorithms for fast and realistic 3D face reconstruction APCCAS2002

Analysis of shape from shading algorithms for fast and reali...

引用

IEEE Asia-pacific conference on Circuits and Systems

作者： M.I. Fanany I. Kumazawa Computer Science Graduate School of Information Science and Engineering Tokyo Institute of Technology Tokyo Japan

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.

关键词： Algorithm design and analysis Shape Image reconstruction Solid modeling Layout Face detection Facial animation Rendering (computer graphics) Photometry computer vision

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Proceedings - 7th pacific conference on computer graphics and applications, pacific graphics 1999

Proceedings - 7th Pacific Conference on Computer Graphics an...

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7th pacific conference on computer graphics and applications, pacific graphics 1999

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.

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Proceedings. Seventh pacific conference on computer graphics and applications (Cat. ***00293)

Proceedings. Seventh Pacific Conference on Computer Graphics...

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pacific conference on computer graphics and applications

Presents the front cover of the proceedings record.

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Simulation of peeling using 3D-surface cellular automata 9

Simulation of peeling using 3D-surface cellular automata

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9th pacific conference on computer graphics and applications (pacific graphics 01)

作者： Gobron, S Chiba, N Iwate Software Ctr Morioka Iwate 0200045 Japan

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.

关键词： computer graphics cellular automaton 3DSCA peeling surface simulation multi-layer modeling natural phenomena

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Dataflow specification for system level synthesis of 3D graphics applications

Dataflow specification for system level synthesis of 3D grap...

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Asia and South pacific Design Automation conference (ASP-DAC 2001)

作者： Park, C Kim, S Ha, S Seoul Natl Univ Seoul 151742 South Korea

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.

关键词： Application software computer graphics computer science Digital signal processing Electronic mail Formal specifications Hardware Pipelines Power system modeling System-level design

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Animating human face under arbitrary illumination 9

Animating human face under arbitrary illumination

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9th pacific conference on computer graphics and applications, pacific graphics 2001

作者： Chen, Tong-Bo Yin, Bao-Cai Huang, Wan-Jun Kong, De-Hui College of Computer Science Beijing Polytechnic University Beijing100022 China

ISBN: (纸本)0769512275

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 light position. By developing a relighting tool, named LUXMASTER, we achieve the great freedom to change the illumination condition and get a variety of photorealistic novel renderings of the human face. Then we introduce morphing techniques to add the time dimension and produce a clip of facial animation with varying illumination and expression. In order to make the morphing work easy, we design an expressive, intuitive and efficient tool, called FLUIDMAN, which at the same time enables enormous possibility of visual effects. © 2001 IEEE.

关键词： computer graphics

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Modeling the structure of the sea anemone and the sea star using hierarchical implicit surfaces 9

Modeling the structure of the sea anemone and the sea star u...

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9th pacific conference on computer graphics and applications, pacific graphics 2001

作者： Liang, Xikun Nur, Mai Ali Wyvill, Brian Department of Computer Science University of Calgary 2500 University Dr. NW CalgaryT2N 1N4 Canada

ISBN: (纸本)0769512275

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 hierarchical implicit surfaces based on the BlobTree. The hierarchy provides both local refinement and global deformation. Local refinement allows the introduction of details on the base surface and global deformations change the overall shape of the model while maintaining the integrity of the surface details. Using a new implicit surface phyllotactic method, we obtain a visually pleasing arrangement of the sea anemone's tentacles. The hierarchical representation of the model provides an easy and efficient way for modeling the many different shape changes of sea anemones. © 2001 IEEE.

关键词： Deformation

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Fine timing: Curve and surface deformation by scaling derivatives 9

Fine timing: Curve and surface deformation by scaling deriva...

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9th pacific conference on computer graphics and applications, pacific graphics 2001

作者： Miura, Kenjiro T. Cheng, Fuhua Wang, Lazhu Shizuoka University Realistic Modeling Laboratory Hamamatsu Shizuoka Japan University of Kentucky Department of Computer Science LexingtonKY United States Raindrop Geomagic Inc. Research Triangle ParkNC United States

ISBN: (纸本)0769512275

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 the derivative is adjusted, the resulting curve or surface keeps the basic shape of the original profile and curvature distribution. Therefore, the new technique is especially suitable for last minute fine tuning of the design process. Other advantages include: (1) the fine tuning process is a real local method, it can be performed on any portion of a curve or a surface, not just on a set of segments or patches;(2) by allowing a user to drag a scalar function to directly adjust the curvature (and, consequently, fairness) of a curve or surface, the new technique makes the shape design process more intuitive and effective;(3) the new technique is suitable for precise shaping and deforming such as making the curvature of a specific portion twice as big. In many cases, it can achieve results that other methods such as FFD can not;(4) the fine tuning process can also be used for subdivision curves and surfaces. Related techniques and test results are included. © 2001 IEEE.

关键词： Deformation

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Direct reconstruction of displaced subdivision surface from unorganized points 9

Direct reconstruction of displaced subdivision surface from ...

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9th pacific conference on computer graphics and applications, pacific graphics 2001

作者： Jeong, Won Ki Kim, Chang Hun Max-Planck-Institut für Informatik Stuhlsatzenhausweg 85 Saarbrücken66123 Germany Dept. of Computer Science and Engineering Korea University 5-1 Anam-Dong Sungbuk-Gu Seoul Korea Republic of

ISBN: (纸本)0769512275

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 detailed mesh with a displacement map over a smooth domain surface. This mesh representation has several benefits - compact mesh size, piecewise regular connectivity - to overcome limitations of irregular mesh produced by ordinary mesh reconstruction scheme, but the original displaced subdivision surface generation algorithm needs an explicit polygonal mesh to be converted. Our approach is producing displaced subdivision surface directly from input points during the mesh reconstruction process. The main ideas of our algorithm are building initial coarse control mesh by the shrink-wrapping like projection and sampling fine surface detail from unorganized points along the each limit vertex normal without any connectivity information of given points. We employ an existing subdivision surface fitting scheme to generate a parametric domain surface, and suggest a surface detail sampling scheme that determines a valid sampling triangle which can be made with combinations of input points. We show several reconstruction examples and applications to show the validity of suggested sampling technique and benefits of the result like multiresolution modeling. © 2001 IEEE.

关键词： Mesh generation

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