DCT算术编码在图象压缩中的应用

Application of DCT arithmetic coder in image compress

针对图像的压缩处理,分析了传统熵编码和算术编码的不同,指出算术编码效果更优的特点,进一步分析了算术编码的问题,提出了一种新的编码方式DCT编码,并将新的DCT算术编码和传统算术编码压缩做了一些比较,采用MATLAB软件调用图像wbarb对这两种方法做了一个简单的比较,得出DCT算术编码可以节约时间,提高效率,也可以使传输中的错误冗余减少,既便于传输,亦可以改善效果,同时DCT算术编码方式应用于图像压缩编码领域,基本可以无失真地压缩图像的结论.最后对算术编码的未来发展前景进行了展望,在时间复杂度和空间复杂度上,可以进一步研究,找到冗余度更低的算术编码方法压缩图像.

According to the compression of the image,this paper analyzes the difference of the traditional entropy coding and the arithmetic coding,points out the characteristics of arithmetic coding are better. It further analyzes the problem of the arithmetic coding,and proposes a new coding method,DCT code. The paper compares the DCT arithmetic coding and arithmetic coding,It uses MATLAB software for the image,wbarb,to do a simple comparison of the two methods. The DCT arithmetic coding can save time,improve efficiency,reduce the mistake redundant in the transmission,convenient transport,also can improve the effect. At the same time,DCT arithmetic coding method is also used in the field of the image coding. Basically,it can undistort image compression results. Finally,prospects for the future development of arithmetic coding is discussed. In the time and space complexity,further study is needed to find image compression coding methods of lower redundancy.