DCT变换在图像压缩中的应用  

Application of DCT Transform in Image Compression

作　　者：武瑛[1] 

机构地区：[1]西安文理学院,陕西西安710065

出　　处：《计算机与现代化》2013年第4期103-106,共4页Computer and Modernization

摘　　要：在信息爆炸的当今社会,图像压缩技术是促进多媒体技术进一步发展的关键技术之一。离散余弦变换(DCT)由于在图像压缩编码方面的独有优势,被广泛推广和应用。本文介绍基于DCT变换的JPEG系统,并从数学角度分析一维DCT和二维DCT正反变换及其变换前后系数频带分布情况。利用Matlab仿真软件,对基于FFT的快速算法和DCT变换矩阵算法分别进行仿真,仿真结果表明,DCT变换在图像压缩中,具有实现简单、方法灵活、易于操作,图像压缩质量高等优点。In the age of information explosion nowadays, image compression is one of the key technologies to promote the further development of multimedia technology. Due to the unique advantage of discrete cosine transform （DCT） in image compression and coding, it is widely extended and applied. This paper describes a DCT-based JPEG system, and analyzes the distribution of one-dimensional DCT and two-dimensional DCT pros and cons before and after transformation coefficients band from a mathemati- cal point of view. And then using Matlab simulation software to simulate the fast-FFT algorithm and the DCT matrix transform al- gorithm, simulation results show that the DCT transform in image compression has the advantages of easy to implement and flexi- ble, easy to operate and high compression quality.

关 键 词：DCT变换 图像压缩 JPEG MATLAB 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]