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Search Results: 1 - 10 of 94946 matches for " Chin-Sheng Chen "
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Template Matching using Statistical Model and Parametric Template for Multi-Template  [PDF]
Chin-Sheng Chen, Jian-Jhe Huang, Chien-Liang Huang
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.43B009
Abstract:

This paper represents a template matching using statistical model and parametric template for multi-template. This algorithm consists of two phases: training and matching phases. In the training phase, the statistical model created by principal component analysis method (PCA) can be used to synthesize multi-template. The advantage of PCA is to reduce the variances of multi-template. In the matching phase, the normalized cross correlation (NCC) is employed to find the candidates in inspection images. The relationship between image block and multi-template is built to use parametric template method. Results show that the proposed method is more efficient than the conventional template matching and parametric template. Furthermore, the proposed method is more robust than conventional template method.

Corner-Based Image Alignment using Pyramid Structure with Gradient Vector Similarity  [PDF]
Chin-Sheng Chen, Kang-Yi Peng, Chien-Liang Huang, Chun-Wei Yeh
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.43B020
Abstract:

This paper presents a corner-based image alignment algorithm based on the procedures of corner-based template matching and geometric parameter estimation. This algorithm consists of two stages: 1) training phase, and 2) matching phase. In the training phase, a corner detection algorithm is used to extract the corners. These corners are then used to build the pyramid images. In the matching phase, the corners are obtained using the same corner detection algorithm. The similarity measure is then determined by the differences of gradient vector between the corners obtained in the template image and the inspection image, respectively. A parabolic function is further applied to evaluate the geometric relationship between the template and the inspection images. Results show that the corner-based template matching outperforms the original edge-based template matching in efficiency, and both of them are robust against non-liner light changes. The accuracy and precision of the corner-based image alignment are competitive to that of edge-based image alignment under the same environment. In practice, the proposed algorithm demonstrates its precision, efficiency and robustness in image alignment for real world applications.

Computer Tomography and Ultrasonography Image Registration Based on the Cooperation of GPU and CPU  [PDF]
Ying-Chih Lin, Chien-Liang Huang, Chin-Sheng Chen, Wen-Chung Chang, Yu-Jen Chen, Chia-Yuan Liu
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.43B014
Abstract:

Image registration is wildly used in the biomedical image, but there are too many textures and noises in the biomedical image to get a precise image registration. In order to get the excellent registration performance, it needs more complex image processing, and it will spend expensive computation cost. For the real time issue, this paper proposes edge gradient direction image registration applied to Computer Tomography(CT) image and Ultrasonography (US) image based on the cooperation of Graphic Processor Unit (GPU) and Central Processor Unit (CPU). GPU can significantly reduce the computation time. First, the CT image slice is extracted from the CT volume by the region growing and the interpolation algorithm. Secondly, the image pre-processing is employed to reduce the image noises and enhance the image features. There are two kinds of the image pre-processing algorithms invoked in this paper: 1) median filtering and 2) anisotropic diffusion. Last but not least, the image edge gradient information is obtained by Canny operator, and the similarity measurement based on gradient direction is employed to evaluate the similarity between the CT and the US images. The experimental results show that the proposed architecture can distinctively improve the efficiency and are more suitably applied to the real world.

An Embedded Isolation Moat Structures with Wide Stopband and Low Parasitic Effect for Elimination Simultaneous Switching Noise
Chin-Sheng Chang;Mau-Phon Houng;Na-Fu Wang;Lih-Shan Chen
PIER Letters , 2009, DOI: 10.2528/PIERL08122305
Abstract: In this letter, we use two embedded isolation moats which have different size to obtain the wide stopband elimination performance. The proposed structure is realized by embedding the double isolation moats between power and ground planes. The suppression frequency range of the proposed structures is from 1.2 to 7.2 GHz and the peak noise improvement in time domain is 36%. Furthermore, the proposed structure uses two elimination cells to avoid the parasitic effect generated in the frequency range of several hundred MHz.
Commutation Relations for Double Tensors of Two Equivalent D Electrons
Chin-Sheng Wu
Physics , 2007,
Abstract: We apply the Clebsch-Gordan and Racah coefficients to calculate the double tensors for two equivalent d electrons. We also obtain the commutation relations for these double tensors and choose certain quantum numbers, which produce a subgroup. From the root vectors of the commutation relations, we identify them with Lie algebra B2. Once we have the correct Lie algebra, it is feasible to use the Wigner-Eckart theorem to find matrix elements for transition states among atomic spectra or nuclear shell models.
The Comparison between the Infinitesimal Operators for SU(3) and Boson Operators in Cartan-Weyl Basis
Chin-Sheng Wu
Physics , 2003,
Abstract: We present the detailed calculation of the infinitesimal operators and the boson operators for SU (3) in Cartan-Weyl basis. They have been used extensively as theoretical models for particle physics. We make a comparison between them, alongside with SL(3,c), which displays the concise appearance.
The Recurrence Relation of Irreducible Tensor Operators for O(4)
Chin-Sheng Wu
Physics , 2004,
Abstract: We derive the recurrence relation of irreducible tensor operator for O(4) in using the Wigner-Eckart theorem. The physical process like radiative transitions in atomic physics, nuclear transitions between excited nuclear states can be described by the matrix element of an irreducible tensor, which is expressible in terms of a sum of products of two factors, one is a symmetry-related geometric factor, the Clebsch-Gordan coefficients, and the other is a physical factor, the reduced matrix elements. The specific properties of the states enter the physical factor only. It is precisely this fact that makes the Wigner-Eckart theorem invaluable in physics. Often time one is interested in ratio of two transition matrix element where it is sufficient to regard only the Clebsch-Gordan coefficients. In this paper we first get the commutation relations of O(4), and then we choose one of these relations to operate on the certain eigenvectors. Finally we take summation over all possible eigenvectors and obtain rather the compact recurrence relation for irreducible tensor operators.
The Calculation of Clebsh-Gordan Coefficients for the Permutation Group by the Eigenfunction Method
Chin-Sheng wu
Mathematics , 2006,
Abstract: We use the eigenfunction method to calculate the Clebsh-Gordan coefficients for the permutation group . This method is well-established by Jin-Quan Chen. Here we elaborate the detailed procedures for the pedagogical purpose. Due to the nature of the symmetry, one may get the degeneracy from the solution of eigenfunctions for given one class operator. In order to remove the degeneracy we use extra class operators, which may be the subgroup class operator or even the state permutation operator. In doing so, a variety of eigenvalues come out. Every eigenfunction is therefore obtained, and basis vectors are completely found.
Improved Compact Broadband Bandpass Filter Using Branch Stubs Co-via Structure with Wide Stopband Characteristic
Wen-Jeng Lin;Chin-Sheng Chang;Jian-Yi Li;Ding-Bing Lin;Lih-Shan Chen;Mau-Phon Houng
PIER C , 2008,
Abstract: In this paper, a broadband bandpass filter (BPF) with superior spurious suppression over a wide frequency range at least up to 20 GHz at 20 dB has been designed. The proposed broadband bandpass filter has designed using quarter-wavelength short stubs alternating with branch stubs co-via structure, and inserting the bandstop filters to substitute for redundant connecting lines. Compare with some traditional co-via structure, this work by using the branch stubs to construct the co-via structure, not only reduce the size around 70% but also decrease the radiation loss due to some complex meander configurations occurring in the connecting lines. For the prototype broadband filter, center frequencies around 4 GHz were selected. The bandwidth of passband was between 1.95 GHz and 6.25 GHz, in which the insertion-loss amounts to around 1.5 dB. The suppression range of stopbandis between 8.2-20.3 GHz, in which the insertion-loss amounts to around 20 dB.
Controlling the Frequency of Simultaneous Switching Noise Suppression by Using Embedded Dielectric Resonators in High-Impedance Surface Structure
Chin-Sheng Chang;Jian-Yi Li;Wen-Jeng Lin;Mau-Phon Houng;Lih-Shan Chen;Ding-Bing Lin
PIER Letters , 2009, DOI: 10.2528/PIERL09082406
Abstract: This work presents a novel design for high-impedance surface (HIS) embedded dielectric resonator (DR) structures to efficiently control bandwidth of suppressing simultaneous switching noise (SSN) in high speed digital printed circuit boards (PCBs). The proposed structure is designed by periodically embedding high dielectric constant materials into the substrate between a continuous power plane and a middle patch. A conventional HIS structure has only one resonance frequency to produce stopband while the proposed structure has two resonances to widen the suppression bandwidth. The -30 dB stopband of the proposed structure is about two times wider than that of a conventional HIS structure. The excellent SSN suppression behavior was verified by measurements and simulations.
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