http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Predictor Order and Error Distribution of MMAE Predictors for Lossless Image Coding
Hirokazu UENO,Yoshitaka MORIKAWA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper investigates the relation between an error distribution and a predictive order of minimum mean abusolute error predictors(MMAE predictors) designed for lossless coding of greyscale images. Design of MMAE predictors reduces to the linear programming problem. Let k is the number of coefficients in a predictor(predictor order), we imagine that predictor order k have a distribution shaping effect. Main purpose of this paper is to ensure that k have such an effect.
A Method for Distinguishing the Two Candidate Elliptic Curves in the Complex Multiplication Method
Yasuyuki Nogami,Mayumi Obara,Yoshitaka Morikawa 한국전자통신연구원 2006 ETRI Journal Vol.28 No.6
In this paper, we particularly deal with no Fp-rational two-torsion elliptic curves, where Fp is the prime field of the characteristic p. First we introduce a shift productbased polynomial transform. Then, we show that the parities of (#E − 1)/2 and (#E΄− 1)/2 are reciprocal to each other, where #E and #E΄ are the orders of the two candidate curves obtained at the last step of complex multiplication (CM)-based algorithm. Based on this property, we propose a method to check the parity by using the shift product-based polynomial transform. For a 160 bits prime number as the characteristic, the proposed method carries out the parity check 25 or more times faster than the conventional checking method when 4 divides the characteristic minus 1. Finally, this paper shows that the proposed method can make CM-based algorithm that looks up a table of precomputed class polynomials more than 10 percent faster.
Fast Reprojection using Tree-Structured Filter Bank from Cone Beam Projections
Hiroaki MORIMOTO,Kazuhiro UEDA,Yoshitaka MORIKAWA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper proposes a fast reprojection method using Tree-Structured Filter Bank from cone beam projection data and shows that we can calculate 4.6 times faster than the conventional interpolation method.
Basis Translation Matrix between Two Isomorphic Extension Fields via Optimal Normal Basis
Yasuyuki Nogami,Ryo Namba,Yoshitaka Morikawa 한국전자통신연구원 2008 ETRI Journal Vol.30 No.2
This paper proposes a method for generating a basis translation matrix between isomorphic extension fields. To generate a basis translation matrix, we need the equality correspondence of a basis between the isomorphic extension fields. Consider an extension field Fpm where p is characteristic. As a brute force method, when pm is small, we can check the equality correspondence by using the minimal polynomial of a basis element; however, when pm is large, it becomes too difficult. The proposed methods are based on the fact that Type I and Type II optimal normal bases (ONBs) can be easily identified in each isomorphic extension field. The proposed methods efficiently use Type I and Type II ONBs and can generate a pair of basis translation matrices within 15 ms on Pentium 4 (3.6 GHz) when mlog2 p = 160.