本文利用Mojette变换实现了一种图像多描述编码方法.Mojette变换是一种离散投影变换,它的各个投影之间是相互独立的,任一组的投影数据可以被另一组所替换.利用这个特性,我们可以方便地控制冗余度来构成多描述码流,并且构造出来的多描述码流不局限于二信道多描述系统,可以任意扩展到多个描述码流的系统.实验证明,这种多描述编码方法实现简单,并且能够获得较好的抗误码性能.
This paper describes a new kind of multiple description coding method for image using Mojette Transform. The so-called Mojette Transform is a discrete analog of Radon Transform, which is a projective transform. In virtue of the independence of the different projections, any portion of the coded image can be replaced by another one if transmission problems occur. Furthermore,using Mojette Transform we can easily control the redundancy and generate any number of descriptions not confined to two descriptions. Experimental results show that the proposed algorithm not only is simply implemented, but also has high performance for error-resilient image transmission.