本文提出了一种基于GTM(Graph Transformation Matching)和多分辨率B样条的医学图像配准方法.为了得到精确的特征点对,使用GTM算法去除血管树模型中的冗余点;然后使用多分辨率B样条函数对图像进行配准.肝脏MRI上的实验证明,本文提出的非刚性配准方法能够有效提取出特征点,并且达到了较好的配准精度.
Analyses the basic criteria of a secure hash algorithm for resisting the brute-force and cryptanalysis attacks.Studies the finite field operations and the structures of the strong symmetric block cipher,and the applications for compression function in secure hash algorithm.And on this basis designs a secure hash algorithm.According to structure of strong symmetric block cipher,designs the irreversible iterated compression function based on the operations of finite fields and bit,and uses the hash value of 256 bits in the algorithm.To 8-bit CPU platform of smart card,indicates the key points using for realizing algorithm efficiently.
为加快独立制造岛内部信息交流速度，缩短产品生产周期，提高企业经济效益，设计了一种独立制造岛内Nc机床控制系统。系统基于RS485总线，进行两级集散控制，采用物理层和数据链路层两层协议在DNCi机与NC机床之间进行通信，通过任务分配、实时调度完成零件加工任务的计划调度。实践证明，该控制系统成本低、操作简单、维护方便，真正实现了管控一体化。
Medical image registration plays an important role in the research of medical image processing field.This paper presents the recent algorithms of medical image registration,and summarized their fundamental principles and research.Finally,some prospects of possible research are given.
针对肝脏和肺部器官在图像配准中特征获取准确度有限性,本文提出了一种机器和人工结合提取特征点的医学图像非刚性配准方法。依据器官中血管形状形成的树状图,使用联合图算法对树状图初步配准后自动提取出特征点,与手工选择的具有解剖意义的点共同构成特征点集。以两幅图像间的互信息作为图像配准测度函数,以确定性退火算法迭代求解最优化配准变换函数。实验证明,该算法能匹配图像的整体结构信息和图像中感兴趣的生理解剖位置,具有很强的鲁棒性。
Based on the analysis of Mathematical model of permanent magnet synchronous motor(PMSM), the theory of maximum torque per ample control was introduced.Maximum torque per ampere control system and id=0 control system were established with MATLAB/ SIMULINK.Two control schemes were analyzed and compared according to simulation results,the advantage and disadvantage of maximum torque per ampere control scheme were given.
