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In the Internet, the digital format of most contents has led to its increased piracy because of the ease of copying and sharing the digital contents. Moreover, the advent of new technologies such as ubiquitous computing seems to cause problems of piracy even more than before. Therefore, we guess it's going to be a more critical issue to control and manage rights of digital contents. In this paper,...
The fed-batch fermentation process is considerably difficult to control accurately owing to its inherent nonlinear and time variant dynamics. To overcome the problems, an observer-based constrained model predictive control is presented for controlling the substrate feeding in bioreactor. First, the modified observer is used for obtaining full state information. Next, from the full state information,...
In this paper, we propose a RB-SR-HARQ (selective repeat based on reliability) protocol on low density parity check codes, which exploits the estimated bits reliabilities at the output of a decoder to retransmit those unreliable bits. Our scheme improves system performance and minimizes retransmission sizes by only retransmitting those bits which are likely to be in error. We simulate RB-SR-HARQ protocol...
This paper presents a compression algorithm based on region of interest (ROI) of face to gain a high compressing ratio and to assure the quality of compressed result. First, the ROI including facial features is detected by the FC2VQ (feature correction two-stage vector quantization) algorithm. Then the mask of ROI is calculated. Finally the proposed algorithm is used to compress. The compression ratios...
Normal mesh is a new fundamental surface description, which is multiresolution mesh where each level can be written as a normal offset from a coarser version. In this paper, we present an algorithm to create normal subdivision triangulations approximating implicit surfaces. Our algorithm begins from a coarse base mesh created by a space-division based polygonization method for implicit surface, and...
Aiming for ellipse detection in complex environment, we propose a compound algorithm. In the scene image that we see everyday, there are usually many corner points and straight lines and it is not practical to use Randomized Hough Transform (RHT) to detect ellipse from such an image, for that the corner points and straight lines everywhere bring numerous noneffective samplings and accumulatings. Aiming...
This paper brings forward a multi-directions algorithm for image edge detection based on fuzzy mathematical morphology. In this algorithm, we integrate the multi-directions characteristic of structure elements and fuzzy image characteristic into mathematical morphology, and then use mathematical morphology to detect image edge. It is indicated from experiment that this algorithm has succeeded in edge...
The dimensionality of face image is high very much. It has a lot of difficulty in face recognition. In this paper, first, the concepts of polynomial fuzzy matching based on four rulers (two point rulers and two slope rulers) are introduced. It is not practical because all the slopes mf must be given at the beginning. It is presented that the fuzzy matching for a nonlinear function between input and...
In this paper, we present preliminary results of our ongoing networked virtual reality project by discussing the implementation and performance of a networked haptic game. In this game, online players feel like handling a real basketball since they are able to feel the sense of touch by using haptic interfaces. One of challenging issues in this implementation is haptic data transmission over the Internet...
Snake models are used more and more widely in applications of image analysis and computer vision. There are two challenging issues for the application of snake models: how to select the initial contour of the object automatically and how to obtain good convergence result. This paper introduces an improved approach for snake model that integrates with GHough transformation and dynamic programming algorithm...
The proliferation of computer devices and wireless networks allows users to access pattern information and collaborative edit graphics with others in ubiquitous environment. However, the limitation of display size and unreliable network of these embedded devices makes it hard for mobile users to browse grouped complicated pattern objects efficiently. We propose semantic group mapping that enable group...
In this paper, we propose a 10 kHz high definition haptic rendering which can display on real-time video-rate (60Hz) in general VR applications. Our proposal requires both fidelity and stability in the multi-rate system, which the frequency ratio approximates at 160 times. For satisfying two criteria, there are some problems to be resolved. In the view of getting only stability, we can use a virtual...
In this paper, we describe early results in the development of an alternative programming method which uses large, three-dimensional acrylic blocks to construct programming sequences. Computer-illiterate children can create a symbolic program to control a humanoid robot toy. We describe the physical design of the blocks, problems encountered, comments made by primary school participants, and make...
In collaborative virtual environment system, to render 3D models on Web based on a unified modeling kernel is a challenging issue. Previous technologies of Web 3D rendering mainly concentrate on the technology of visualization and interaction, and typically Web 3D models are rendered with surface model. In this paper, we develop a novel Web 3D viewer based on STEP/AP203 kernel, and the relation of...
This paper presents LensTree, a novel browsing and navigation tool for large hierarchical information structures. It enhances traditional indented lists by applying focus + context view to its design. LensTree dynamically changes the sizes of nodes to provide a focal area around the mouse pointer while keeping nodes in the peripheral area in smaller sizes as context. This enables it to display a larger...
This paper presents an omni-directional image generation algorithm on spherical coordinates by compensating vignetting and illumination effects. The algorithm generates an omni-directional image by transforming each planar image to the spherical image. In this paper, vignetting and illumination compensation methods are proposed for realistic and seamless omni-directional video systems. We can synthesize...
In the PCO (pest control operation) market, the intelligence spraying fog with truck-mounted machine is the most advanced method in its profession field currently. Facing with the characteristics of spray target and the require of operation apply, a methods of capturing target and control spray direction are proposed based on fuzzy theory in this paper. It is effectively solved the problem of environmental...
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