on the basis of the study of edge detection algorithms, a zone binary method is presented . the preprocessing methods of grating image are studied, and the 3d object surface data is reconstructed 在对模板图象进行处理时,在研究各种边缘检测算法的基础上提出了区域二值法的概念,用局部区域的阈值进行二值化,结合梯度算子实现被测物体边缘的自动识别。
the binary method, which combines the global method and local method, is discussed . furthermore, the skew detect based on run length-smoothing is explained in the paper . at the same time, the layout analysis based on components search is introduced 文中讨论在档案数字化过程中所涉及到的文档图像处理技术,重点介绍了全局二值化与局部二值化相结合的二值化方法,基于游长平滑处理的文档图像倾斜校正算法,以及基于组件搜索的文档图像版面分析。
montgomery multiplication algorithm is optimized for large-bit modular multiplication and vlsi implementation . it is combined with the r-l right to left binary method to achieve speed improvement . special efforts are focused on the problems with long-bit modular arithmetic 介绍了采用蒙哥马利模乘法算法和指数的从右到左的二进制方法,并根据大整数模乘法运算和vlsi实现的要求进行改进的rsa处理器,在提供高速rsa处理能力的同时,可抵抗某些定时分析攻击和功耗分析攻击。
operation layer is the basic core part in elliptic curve encryption system including how to calculate elliptic curve's stairs is a large prime or including a large prime gene to ensure elliptic curve to be safe elliptic curve; in this article safe elliptic curve is chosen by p1363 sae algorithm . besides, how to achieve fast point multiplication will influence the performance efficiency of the whole encryption system; in this article, for different situations, signed binary method and rolling window method are respectively applied to perform quick operation of elliptic curve's point multiplication 运算层是椭圆曲线密码体制实现的最基础、最核心的部分,包括如何来计算椭圆曲线的阶为大素数或含有一个大的素因子,以保证所选取的椭圆曲线为安全椭圆曲线,本文根据ieeep1363协议的sea算法实现了安全椭圆曲线的选取;另外如何实现标量乘的快速运算,将会影响整个密码系统的实现效率,本文根据不同情况对椭圆曲线的标量乘法分别采用了带符号的二进制法和滑动窗口法进行快速运算。