Extensive experiments show that the highest accuracies of evaluating weights are correspondingly 93 . 90 % and 87 . 27 % about color images and grayscale images , which improves the precision and the efficiency of the image reassembly 对标准图像进行实验的结果表明,所提出的三种方法对彩色图像碎片权重计算正确率最高可以达到93 . 90 ，对灰度图像碎片权重计算正确率最高可以达到87 . 27 ，对重组效率有一定的提高。
Secondly , the author plans and completes a network ids which adopt the protocol analysis and pattern match method . ip fragment reassembly and tcp stream assembling is analyzed and completed , decoding the http request which coding by the unicode to the ascii 作者分析和实现对网络数据包的捕获、对ip协议解码和tcp协议解码，正确的实现了ip分片重组和tcp流还原，将unicode编码的http请求解码为ascii编码。
Three different methods were proposed based on a k - vertex disjoint graph technique which was applied to the reassembly of image fragments : similar coefficient matching ( scm ) , volatility gradient matching ( vgm ) and prediction pixel matching ( ppm ) , to evaluate the candidate weights between any fragments 针对目前最优重组算法中的关键技术- -邻近权重选派技术，提出三种计算方法：相似系数匹配（ scm ） 、波动梯度匹配（ vgm ）和预测像素匹配（ ppm ） 。
Also , to achieving stability , internal speedup is needed . compared to fixed length switch , by supporting variable length packet switch , there is no need for segmentation and reassembly circuits , and no speedup is necessary to support sar . this dissertation first studies variable length packet switch in unbuffered crossbar 另外,变长交换不需要在数据交换前和交换后进行分割和组合操作,因此在入端口处不需要一个额外的切割模块,而在出端口处则不需要一个额外的组合定长信元的模块,节省了存储器资源以及信元重排序的规模。
Computer - aided paper fragments reassembly is a novel and typical application in the field of computer vision and pattern recognition , which is completed through scanning and image extraction techniques to obtain the shape , color and other information . then the paper fragments are reconstructed based on computer processing 碎纸自动拼接技术是图像处理与模式识别领域中的一个较新但是很典型的应用,它是通过扫描和图像提取技术获取一组碎纸片的形状、颜色等信息,然后利用计算机进行相应的处理从而实现对这些碎纸片的全自动或半自动拼接还原。
The research work can be organized in the following aspects . 1 ) according to the theories of image pre - processing , the paper researches into the approach of image segmentation and edge detection and adopts the approach of color image segmentation and level set to image pre - processing based on automatic reassembly of paper fragments . it has a good result . 2 ) the paper introduced a novel shape - matching algorithm based on automatic reassembly of paper fragments 主要工作有以下几个方面: 1 )依据图像预处理理论研究了图像分割,边界提取等方法,在碎纸自动拼接的预处理中,采用了彩色图像分割和水平集图像分割方法,实验效果良好。 2 )在碎纸自动拼接复原中,提出了一种新的形状匹配算法。
In the detection of protocol analysis model , we mainly studied the fragment reassembly of ip packet on the bases study of tcp / ip protocol . in the detection of pattern match model , we analyzed several kinds of pattern match algorithms such as : kmp , bm , bmh and multiple pattern match algorithms ( wang 2002 ) 在基于协议分析的检测方法中，从tcp / ip协议族的层次结构出发，主要分析了ip包的分片重组技术；在基于模式匹配的检测方法中，主要分析了多种模式匹配算法： kmp 、 bm 、 bm的改进算法以及多模式匹配算法。
Secondly , the paper describe the principle of atm network , and the function of ' sar " ( segmentation and reassembly ) and the format of packet aal5 , and introduce the basic idea of ipoa , and the design project and implementing of the control chip . later , the paper introduce the logic function and operational principle of packet buffer control chip and prove the feasibity and correctness of the arithmetic . at last the paper introduce crc - 32 arithmetic based on look up and implement it with hardware 接着详细论述了核心路由器atm网络实现的原理，包括“ sar ” ( segmentationandreassembly )功能和aal5报文的格式， ipoa基本思想，以及控制芯片的设计方案和实现途径等。然后又论述报文缓存区控制芯片的工作原理和逻辑功能等，并对算法的可行性，正确性等进行论证。最后介绍了一种基于查表的crc - 32算法的原理及其硬件实现。
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