数字编码图像加密毕业设计参考.docVIP

请慎重参考！！！ 本科毕业设计（论文） 算术编码的图像加密算法的设计和实现 学 生： 学 号： 指导教师： 专 业： 计算机学院 二OXX年月 Graduation Design (Thesis) of Chongqing University Design and Implementation of Image Encryption Algorithm Based on Arithmetic Coding Undergraduate: Supervisor: Major: June 2010  摘 要 随着计算机多媒体技术和网络通信技术的迅速发展，人们对多媒体信息的需求不断增长图像数据压缩编码技术己成为多媒体及通讯领域中的关键技术 关键词：数据压缩，整数型算术编码，自适应模型，图像加密，块交换 ABSTRACT With the rapid development of computer multimedia technology and network communication technology, the demand for multimedia information is growing. Moreover, because of the huge amount of multimedia information and information security needs, image data compression technology and digital image data encryption technology have been the key technologies in the field of multimedia and communications. This dissertation studies and implements a widely used method of data encoding, namely arithmetic coding. Besides, an image encryption algorithm based on arithmetic coding is also proposed. To address the accuracy of the calculation in arithmetic coding, this design implements integer arithmetic coding. According to the experimental results of fixed model and adaptive model, the calculation is drawn that the adaptive model has the optimal efficiency. In order to achieve efficient, real-time and secure transmission of image information, with the use of error-sensitive and statistical probability-sensitive feature of arithmetic coding, an encryption algorithm which can randomly permute the image information data block is summarized. Once the initial key is set, the key stream can be generated by the group of linear feedback shift registers. The partition and permutation of information data are determined by the key stream. The same key stream can be generated in the decryption algorithm with the same initial key, and the original data can be recovered. According to experimental data analyses, the algorithm does not have a negative impact on coding efficiency, at the same time the real-time transmis