Controposed to single description coding(SDC)

multiple description coding(MDC) for image is source coding in which several bit streams(descriptions) of original image are produced such that acceptable quality of the reconstructed image can be obtained from each description.The quality of reconstructed image only depends on the number of descriptions

the more descriptions

the higher quality of reconstructed image is obtained from combining these descriptions.MDC scheme is well suited to the channels which transmission conditions are very poor for image communication without channel coding

especially for networks and wireless channels.In this paper

the theoretical and practical techniques of MDC are exposed

the advances of MDC are described for these years.A MDC scheme of image based on EZW(Embedded Zerotree Wavelet) is presented.The simulation results show that this method is simple and efficient

and implements robust transmission of compressed image considering the compression efficiency.