Proceedings. International Conference on Computer Graphics, Imaging and Visualization, 2004. CGIV 2004.

26-29 July 2004

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Displaying Results 1 - 25 of 59
  • A unified framework for user-controlled simplification

    Publication Year: 2004, Page(s):221 - 226
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB) | HTML iconHTML

    Polygonal models are ubiquitous in every application of computer graphics but their real time manipulation and rendering in such interactive application environments as are sensitive to their sizes and complexity have become a threat. A whole family of automatic algorithms emerged during the last decade to help out this problem, but they reduce the complexity of the models uniformly without caring... View full abstract»

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  • Non-photorealistic outdoor scene rendering: techniques and application

    Publication Year: 2004, Page(s):215 - 220
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB) | HTML iconHTML

    Many researches in non-photorealistic rendering (NPR) have been done to investigate a variety of techniques to simulate the styles of hand-drawn artists. Many applications in industrial, architectural animated film production, technical design, and computer graphics designs have focused on rendering 3D models to depict non-photorealism. Most of them are based on rendering characters and object-bas... View full abstract»

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  • A framework for polysensometric multidimensional spatial visualization

    Publication Year: 2004, Page(s):159 - 164
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (277 KB) | HTML iconHTML

    Typically any single sensor instrument suffers from physical/observation constraints. This paper discusses a generalized framework, called polymorphic visual information fusion framework (PVIF) that can enable information from multiple sensors to be fused and compared to gain broader understanding of a target of observation in multidimensional space. An automated software system supporting compara... View full abstract»

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  • Efficient method for geometric attribute estimation

    Publication Year: 2004, Page(s):209 - 214
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (321 KB) | HTML iconHTML

    A new method is proposed to estimate the discrete geometric attributes, such as normal vector and curvature. The method contains two steps: points sampling and 4D Shepard interpolation. In the first step, we extract points from point cloud and estimate the attribute of the sampled points. During the second step, we interpolate a global 4D Shepard surface over these sampled points and compute the a... View full abstract»

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  • A comparison of noise removal techniques in songket motif images

    Publication Year: 2004, Page(s):139 - 143
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (829 KB) | HTML iconHTML

    Noise removal or noise suppression is important as the results of the noise removal task have a strong influence on the quality of the following image processing techniques. In this paper, three popular filters that is mean, median and adaptive filters are tested on 25 images of songket motifs. Different sizes of the filter kernels are also used as it plays a factor in producing the desired result... View full abstract»

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  • Face detection system based on feature-based chrominance colour information

    Publication Year: 2004, Page(s):153 - 158
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB) | HTML iconHTML

    This paper presents a novel face detection system based on feature-based chrominance colour information from an image containing one face in indoor environment with non-uniform background. The face detection algorithm is based on the adapted chain code (ACC), eye detection and modified golden ratio (MGR). ACC is proposed to obtain a face boundary. MGR attempts to extract part of a face that includ... View full abstract»

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  • Evaluating the visual manipulation with cellular automata-like algorithms

    Publication Year: 2004, Page(s):203 - 208
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB) | HTML iconHTML

    The Active Knowledge Studio group at the University of Aizu is studying, designing, and developing multimedia programming environments for various domains. One of the promising domains is the cellular automata where the global behavior of systems arises from the collective effect of many locally interacting, simple components. The cellular automata (CA) systems have a rich theoretical basis. They ... View full abstract»

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  • Towards G2 curve design with Timmer parametric cubic

    Publication Year: 2004, Page(s):109 - 114
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (350 KB) | HTML iconHTML

    There has been vast research in the area of computer aided geometric design in order to identify algorithms to design objects. Timmer parametric cubic or Timmer PC was introduced by Harry Timmer as a follow up to the legendary Bezier curves. However it was then not utilized as it does not satisfy convex hull property, CHP. Since then, there lack studies to explore the possible usages and discover ... View full abstract»

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  • Adaptive parameter selection for improved fuzzy image enhancement

    Publication Year: 2004, Page(s):131 - 136
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (603 KB) | HTML iconHTML

    Previously, an effective parameter controlled method for noise reduction and sharpening of images corrupted by Gaussian noise was presented. However, the same parameter value was used for the entire image resulting in excess smoothing or sharpening of image features. In this paper, we adapted that method for impulse noise reduction and propose an efficient means to obtain the parameter value adopt... View full abstract»

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  • An efficient method for human face recognition using wavelet transform and Zernike moments

    Publication Year: 2004, Page(s):65 - 69
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (282 KB) | HTML iconHTML

    This paper presents a method of combining wavelet transforms (WT) and Zernike moments (ZM) as a feature vector for face recognition. Wavelet transform, with its approximate decomposition is used to reduce the noise and produce a representation in the low frequency domain, and hence making the facial images insensitive to facial expression and small occlusion. The Zernike moments, on the other hand... View full abstract»

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  • On the design of optimal derivative filters for coherence-enhancing diffusion filtering

    Publication Year: 2004, Page(s):35 - 40
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2053 KB) | HTML iconHTML

    For strongly oriented anisotropic processes such as coherence-enhancing diffusion filtering, it is crucial to use numerical schemes with highly accurate directional behavior. It is not possible in a satisfactory way when discretizations are limited to 3 × 3 stencils. We can expand discretization stencils in the first-order derivative filters scheme (J. Weickert, 2002). In 2d or 3d images, th... View full abstract»

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  • Fingerprint matching based on directional image constructed using expanded Haar wavelet transform

    Publication Year: 2004, Page(s):149 - 152
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2445 KB) | HTML iconHTML

    A directional image for a fingerprint obtained from an expanded second stage Haar wavelet transform is presented. This directional image represent the orientation pattern that later on are used for fingerprint matching so that the real owner can be identified. To construct the directional image, we first perform a second stage Haar wavelet transform on a fingerprint. Due to the limitation of the H... View full abstract»

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  • Approximating subdivision for quadrilateral nets with 4-valence topology

    Publication Year: 2004, Page(s):9 - 14
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB) | HTML iconHTML

    In the paper, a new approximating subdivision scheme is presented for quadrilateral nets with 4-valence topology which generates the limit surface of C1 in the limit at the regular face and quasi-tangent plane continuous at the irregular region. The main advantage of the scheme comparing with other algorithms is limit surfaces generated by the scheme can hold the shape of initial contro... View full abstract»

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  • Extracting contour lines from scanned topographic maps

    Publication Year: 2004, Page(s):187 - 192
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB) | HTML iconHTML

    Contour lines are the main graphical element to characterize 3D terrain on 2D map sheets. The conversion of raster contour data to the corresponding vectors is still an interesting problem in the stage of research. In this paper, we suggest a contour extraction or simplification method, subsequently perform a fully automated, derivation of topographic map sheets containing simplified contour lines... View full abstract»

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  • Precomputed radiance transfer with spatially-varying lighting effects

    Publication Year: 2004, Page(s):101 - 108
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2857 KB) | HTML iconHTML

    We propose a new method to render physically-based globally illuminated scenes at interactive speed. Our method is based on precomputed radiance transfer (PRT) (Sloan et al., 2003). Although the shape of model does not change and its position is fixed, we can move any light source with arbitrary shape dynamically during rendering process. This enables a spatially-varying lighting effect which has ... View full abstract»

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  • Constrained C1 interpolation on rectangular grids

    Publication Year: 2004, Page(s):239 - 244
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB) | HTML iconHTML

    This paper is concerned with the range restricted interpolation of data on rectangular grids. The interpolant is constrained to lie on the same side of the constraint surface as the data. Sufficient non-negativity conditions on the Bezier ordinates are derived to ensure the non-negativity of a bicubic Bezier patch. The method modifies Bezier ordinates locally to fulfill the sufficient non-negativi... View full abstract»

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  • Food handling and packaging using computer vision and robot

    Publication Year: 2004, Page(s):177 - 182
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1621 KB) | HTML iconHTML

    Even though the use of robot vision system in manufacturing sectors is now a commonplace, however, the technology embodied in these devices is poorly matched to industrial needs of food processors. In particular, food processing imposes special demands upon machinery. For instance the vision sensor must be programmed to detect the position of single and isolated object as well as overlapping or oc... View full abstract»

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  • 3D object recognition using 2D moments and HMLP network

    Publication Year: 2004, Page(s):126 - 130
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (445 KB) | HTML iconHTML

    This paper proposes a method for recognition and classification of 3D objects using 2D moments and HMLP network. The 2D moments are calculated based on 2D intensity images taken from multiple cameras that have been arranged using multiple views technique. 2D moments are commonly used for 2D pattern recognition. However, the current study proves that with some adaptation to multiple views technique... View full abstract»

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  • Visual inventory inspection using optical character recognition

    Publication Year: 2004, Page(s):89 - 92
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (426 KB) | HTML iconHTML

    This paper presents a research on developing a visual inspection of character base image for automatic inventory control system by using an optical image processing method. Usually, bar code method has been used as an input device for inventory control system. However, data or information that included in a bar code may not sufficient for the purpose of inventory controlling. Therefore, for the pu... View full abstract»

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  • Framework for real time cloud rendering

    Publication Year: 2004, Page(s):56 - 61
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (389 KB) | HTML iconHTML

    Computer graphics (CG) is a key technology for producing visual contents. Currently computer generated imagery techniques are being developed and applied, particularly in the field of virtual reality applications, film production, training and flight simulators, to provide total composition of realistic computer graphic images. Clouds are an integral feature of the sky without them synthetic outdo... View full abstract»

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  • Generation of geometrical patterns based on coloured pixels using computer graphics

    Publication Year: 2004, Page(s):27 - 32
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (562 KB) | HTML iconHTML

    Graphic primitives were looked at as a base to create geometrical patterns. For the last few years, the authors have used computer graphics to generate, study and analyse a very large collection of geometrical patterns. The paper is based on this experience. First, a classification system was developed for the existing patterns based on graphic primitives. All patterns generated by this system hav... View full abstract»

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  • Fuzzy set in geometric modeling

    Publication Year: 2004, Page(s):227 - 232
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (250 KB) | HTML iconHTML

    Geometric modeling involving uncertainty of data is the major problem in CAGD. By using the theory of fuzzy set and its properties, the issues of uncertainty can be solved through the concept of fuzzy numbers. We apply fuzzy numbers as uncertainty data and defined a new kind of fuzzy control points. With this type of points we then introduced a fuzzy Bezier curve and fuzzy B-spline. By these defin... View full abstract»

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  • Imaged-based 3D face modeling

    Publication Year: 2004, Page(s):165 - 168
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB) | HTML iconHTML

    We present an image-based 3D face modeling algorithm. Different from traditional complex stereo vision procedure, our new method needs only two orthogonal images for fast 3D modeling without any camera calibration. The proposed method has two steps. Firstly according to MPEG-4 protocol for 3D face structure, we appoint and deform feature points by radial basis functions (RBF) in the input images c... View full abstract»

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  • Real-time facial expression recognition in the interactive game based on embedded hidden Markov model

    Publication Year: 2004, Page(s):144 - 148
    Cited by:  Papers (2)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB) | HTML iconHTML

    Combine the facial expression of the game player with the game role and the context can highly enhance the interaction and attractiveness of the interactive computer game. We propose a framework to real-time facial expression recognition in the interactive computer game environment. There are two main contributions of this work. First, an embedded HMM for face recognition as stated in A. V. Nefian... View full abstract»

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  • Generating G1 fonts using cubic ball functions with weight

    Publication Year: 2004, Page(s):115 - 119
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (486 KB) | HTML iconHTML

    This paper explores the construction method proposed by Said (1990), using basis functions which are derived from basis functions of Bezier and Bail. This method reduces to Bezier and Ball respectively by choosing suitable parameters (weight) for the Said case. The properties of the generated curves will be given in order to construct fonts which satisfy tangent plane continuity. Constructed curve... View full abstract»

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