基于DCT的图像压缩编码算法及其MATLAB实现【毕业论文+文献综述+开题报告】.doc

（2011 届） 毕业设计 题 目：基于DCT的图像压缩编码算法及其 MATLAB实现 姓　　名：　　 　　 　　　　　 专　　业：　　 电子信息工程 　　　 班　　级：　　　基于DCT的图像压缩编码算法及其MATLAB实现 摘 要 在当今社会中随着信息技术的迅速发展，图像压缩技术扮演着越来越重要的角色，对其也有着更高的要求。基于此在众多图像压缩标准中选择了DCT离散余弦变换对该技术进行研究， 在本次研究中主要介绍了JPEG压缩编码的实现过程及方法，并具体说明了DCT变换和量化等各项模块的方法、原理及在数学上的推导过程，分析这几项在图像压缩上的功能。接着用通过对各种软件的比较，选取了MATLAB进行仿真。图象经过不同的压缩之后，能够满足不同的场合不同的节制码率下要求不同的图象质量的实际需要。用MATLAB做仿真测试，要领简略并且偏差小，大大提高了图象压缩的效率和精度。 实验结果表明基于DCT 变换的JPEG 图像压缩方法简单、方便,在确保拥有较高压缩比的同时又能确保有较高的图像质量，通过使用MATLAB所得出的仿真结果很好的反映了DCT的编码算法原理。 关键词：JPEG图像压缩；DCT；MATLAB；图像处理工具箱 Dct-based image compression algorithm and MATLAB Implmentation Abstract In todays society along with the rapid development of information technology, image compression technology plays a more and more important role in its, also has higher requirements. Based on this in many image compression standard chose DCT discrete cosine transform of using the technology research, In this study mainly introduced the JPEG compression coding the realization and methods, and specifying the DCT transformation, wavelet transform and quantitative methods of the module in mathematics, the principle and the derivation process, analyzes this several in the image compression functioning.Then use through various software comparison, selected the MATLAB simulation.Image after different compression after, can satisfy the different occasions different temperance yards rates require different image quality practical needs.MATLAB do simulation test, bringing brief and deviation small, greatly improving the image compression efficiency and precision. Experimental results show that dct-based transform JPEG image compression method is simple and convenient, ensure a higher compression ratio also ensures a higher image quality, through the use of MATLAB simulation results of gains from the well reflect the DCT encoding algorithm principle. Keywords: JPEG image compression；DCT；MATLAB；Image Processing Toolbox 目录 摘 要 III A