Papers by Keyword: Fast Computation

Abstract: A new method is proposed for fast computation of Zernike moments. This method presents a recursive relation to compute the entire set of Zernike moments. The fast computation is achieved because it involves less addition and multiplication operations. The experimental results show that the proposed method for the fast computation of Zernike moments is much more efficient than existing fast methods in most cases

Abstract: The calculation speed is one of most dofficult problems for a computer-generated hologram of an object. This is due to the facts that both the pixel number of an object and that of the hologram are very large. In this paper we calculate the computer-generated hologram of an object by a difference method and translation symmetry. The main operation of the difference method is addition which is faster than multiplication and division. By translation symmetry of pixels of the object and holgram plane, we can void many repeating calculations. Thus oue method can speed up the computer-generated hologram of an objec. The computer simulation result proves that our method is effective.

Abstract: The distortion and the residual stress are the inevitable consequences of the welding and these may reduce the strength and the quality of the welded structures. To prevent the harmful influence of the welding distortion and the residual stress, their theoretical prediction is necessary. However the existing methods are mostly developed for the study of specimens in laboratories. Compared to the specimens, the structures manufactured in the industry are larger in size and more complex in geometry. For the theoretical prediction applicable to industrial structures, more powerful and practical methods are necessary. To achieve this goal, the authors developed a fast computational method for thermal elastic plastic analysis and an elastic finite element method using inherent deformation.