Yang Yang

University of Science and Technology, Beijing, Peping, Beijing, China

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Publications (7)0 Total impact

  • K. Berthe, Jing Yun Hua, Yang Yang
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    ABSTRACT: Fractal image compression has received much attention from the research community because of some desirable properties like resolution independence, fast decoding and very competitive rate-distortion curve. Though progress has been made in fractal compression, the long encoding times still remain the main drawback of this technique, which result from the need for performing a large number of range-domain matches. The total encoding time is the sum of the time required to perform each match. The reduction of the encoding time leads to minimization of the formula ||r - (sd + o1)||<sub>2</sub><sup>2</sup>, where s, o are respectively the luminance and contrast of the domain block d, and r is the range block. Several methods have been proposed in order to speed-up fractal image coding. An efficiency fuzzy algorithm based on fuzzy comparison of the feature distance between each range and domain block has been provided to speed-up the encoding time, without degradation of the image quality. The proposed method has been compared to the general fractal coding method for testing its efficiency.
    TENCON '02. Proceedings. 2002 IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering; 11/2002
  • K. Berthe, Yang Yang
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    ABSTRACT: The problem of many current investigations in mathematical imaging is to find the optimal representation to perform specific enhancements by extracting the relevant information contained in an empirical signal. After a review of some classical method, the edge extraction and image transform is presented using the development of multiwavelets theory. The method is based on the ideas involving scale-space filtering in the field of human vision and on other developments in the theory of multiwavelets. In the end three descriptive parameters are determined for each pixel in the image from which a modulus maxima line is found. These three edge-parameters make it possible to select edges according to the largest distance: at which they are still visible, their strength, and their sharpness. An implementation on images is also discussed
    Info-tech and Info-net, 2001. Proceedings. ICII 2001 - Beijing. 2001 International Conferences on; 02/2001
  • K. Berthe, Yang Yang
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    ABSTRACT: The Internet is a global collection of autonomously administered packet-switched networks that use the TCP/IP protocols to form a single virtual network allowing every part to communicate with any other. Internet nodes have unique addresses called IP addresses. An IP address contains location information, which is used by the IP to route the datagrams. As a result it is not possible to incorporate mobile nodes into the Internet. Because of this, a major modification to IP has been developed and standardized. This modification referred to as Mobile IP, enables mobile nodes to be connected to the Internet. This paper provides an overview of this modification. An intelligent network (IN) with Mobile IP for military tasks, which are predominantly radio-based and "on the move" with minimal fixed infrastructure, is also presented
    Info-tech and Info-net, 2001. Proceedings. ICII 2001 - Beijing. 2001 International Conferences on; 02/2001
  • K. Berthe, Yang Yang
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    ABSTRACT: Recent developments in pulse-coupled neural networks (PCNN) techniques provide is efficiency in edge and target extraction. The detection of targets is facilitated by PCNN multiscale image factorization. But noise is still the enemy of PCNN. An efficient new pulse-coupled neural networks technique has been proposed by combining with wavelet theory. The new pulse-couple neuron network (PCNNW) is based on multiresolution decomposition for extracting the features of interest in the images by eliminating the noise. On the other hand the wavelet coefficients provide supplemental discrimination and lead to characteristic sets of numbers useful in identifying image factors of interest. The efficiency of the new method has been attested through some test images
    Info-tech and Info-net, 2001. Proceedings. ICII 2001 - Beijing. 2001 International Conferences on; 02/2001
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    Kya Berthe, Yang Yang
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    ABSTRACT: Nowadays video communication is still a challenge for multimedia communication. They are mainly three important exigencies that are strongly been demanded in multimedia communication: the efficient compression of the video stream (good resilience) to minimize the memory occupation; the progressiveness, which is requested by the tremendous market of the world wide web, and resolution independence, which is a key requirement for desktop publishing. In this paper, to satisfy these three requirements, a dynamic compression method is proposed. The new approach is based on traditional Discrete Cosine transformation (DCT), fractal, and Wavelet Trellis-Code Quantization (TCQ) method. The high compression and the resolution independency are assured using Hybrid Fractal-Wavelet method, and the TCQ the progressiveness in transmission, by quantize the residual error in the encoding. The efficiency of our method has been proved comparing to the common Fractal-Wavelet method.
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    Kya Berthe, Yang Yang
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    ABSTRACT: Detecting interesting region from pictures is important in order to reduce the computational complexity associated with such time-consuming processes as image analysis, and recognition extraction. We introduce a method for noise image segmentation based Pulse-Coupled Neural Networks (PCNN) techniques and Gabor filter theory (1). Using the multi-scale factorization properties of PCNN, An image segmentation algorithm aims to assign a class label to each pixel of an image based on the properties of the pixel and its relationship with its neighbors. The Gabor filter is particularly well suited for noise images and images which containing singularities (edges and ridges), it provides a good classifier for distinguishing between textures. The efficiency of the simulation result show that the propose hybrid "PCNN and Gabor Filter (PCNNGF)" is a good tools for noise image extraction.
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    Kya Abraham Berthe, Yang Yang
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    ABSTRACT: Education is always a matter of great debate. Research undertaking in education employs a wide variety of methodologies, which can be divided into two methodologies: the sequential methodology and the concurrent methodology (1). There can never be any really adequate substitute for direct hands-on learning as in lab experiments. However, the rapid development of the Internet, wireless network and multimedia based on motion video, allows us to anticipate virtual places and to access support learning communities at anytime and anywhere. This can do a great deal to accelerate the remaining portions of the learning process. This paper tries to unify sequential and concurrent methodology for Africa engineering teaching, by examining their advantages and their drawbacks, and a mixed methodology model is presented using the above recent developments which one appropriate to the teaching of