Moreover , the paper make research on the arithmetic disposal of image and data in the entire process from digital image to layer vector data of part , and improve it further and realize these arithmetic by soft 并且对从数字图象到零件的层矢量数据整个过程当中涉及到的图象和数据处理算法进行了研究，做出了进一步的改进，并用软件实现了这些算法。
The high frequency noises from analog video signal are quantified into digital image . such noises are needed to be weakened or eliminated because they will interfere in eigenvalue identify sequentially in track performance 模拟视频信号包含的高频随机噪声被量化到数字图象中,将影响特征识别进而影响跟踪性能,需要通过数字滤波的方法进行削弱和滤除。
In the field of digital image processing , image compression coding is always a hot and important topic . with the development of multimedia application , the requirement of compression is beyond the technology provided by jpeg standard 在数字图像处理领域，数字图象的压缩一直是个非常重要的课题，随著多媒体应用领域的激增，传统jpeg压缩技术已无法满足人们的要求。
Firstly , a natural number chaotic sequence is created with the key . then the image matrix is transformed with this chaotic sequence , using the magic cube transformation . the results indicate that the proposed algorithm can get a satisfying effect 提出了一种在小波域内的基于混沌序列的模运算数字图像加密解密算法和基于混沌序列的魔方变换数字图象加密解密算法。
The method of fractal image compression transfers a digital into a group of contract iterate function system ( ips ) model . encoding ifs ' s parameters achieves image compression . this method may gain higher compression ratio , as well as decoding rapidly 分形图象压缩方法是根据图象的自相似性，将一幅数字图象转化为一组收缩的迭代函数系统模型，通过对迭代函数系统参数编码达到图象压缩的目的。
Image encryption derives from the early classic encrypted theories . its purposes is to encrypt a color image . any scene and outline of the old image does n ' t exist in the encrypted image and the deencrypted image is the same as the old one 数字图象加密源于早期的经典加密理论，其目的是将一幅给定的图象按一定的变换规则在空域或频域将其变换为一幅杂乱无章的图象，从而隐藏其图象本身的真实信息。
Along with the rapid development and application of the digital camera , the collection and processing system based on the digital camera has obtained wide attention and application , which has higher resolution and cheaper cost than the traditional fashion of collection image 随着数码相机技术的迅速发展和应用，基于数码相机的数字图象采集处理系统以其凌驾于传统采集方式之上的高分辨率、低成本的优点而得到了广泛的关注及应用。
We discusses in detail the key technology involved in the realization of the system , such as : digital image compression technology , network streaming media technology , real - time transmission technology and etc . , and give a detail discuss of key technology - development and realization of the com component of the main function of the system according to method of com - based programming technology . we also expatiate the designing and implement of the system 本文讨论了系统实现过程中涉及的关键技术如：数字图象压缩技术、网络摘要流媒体技术、实时传输技术等，并且对于系统实现的方法?基于com组件化的程序设计方法进行了详细的讨论，阐述了采用com组件化实现系统的设计与实现。
It has important potential applications in copyright protection of digital media , secret communication and hidden annotation of host data . facing with this problems , aims of this paper will mainly focus on following aspects : 1 . combined with the logistic mapping in non - linearity dynamics system , an image - encrypting algorithm based on modular arithmetic in wavelet transform is designed 本文在前人工作的基础上，针对当前数字水印和图象加密的发展状况，完成了以下工作： 1 、从多媒体数据安全的角度，分析了多媒体信息的特点，深入研究和分析了数字图象加密技术。
1 . digital image scrambling digital image scrambling comes from the algorithms used by the classical cryptography in the early time . digital image is considered as a two dimension matrix , and when the permutation transform is executed , the digital image is disturbed and the way for protecting the digital image is obtained 本文所做的创新工作总结如下： 1数字图象置乱数字图象置乱起源于经典的密码学早期所使用的一些密码算法，把数字图象看成一个二维的矩阵，对这个矩阵进行排列变换，使数字图象变成一幅杂乱无章的图象，达到对图象进行扰乱的目的。
