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图象压缩编码数据在进行传输时对信道的误码显得十分脆弱。本文针对这种情况提出了一种基于块变换和变长编码技术的压缩编码图象提高传输质量的误码控制信息恢复方法。其处理过程是：首先通过在编码码流中加入扩展同步码以将误码控制在一行之内，然后在解码端对发生差错的数据进行误码检测并采用差错信息恢复算法重建原始信息。该方法对编码器只需作很小的修改，所增加的信息冗余度很小，实验结果表明采用此方法后重建图象质量得到明显提高。
Image compression encoded data in the transmission of the channel error is very fragile. In view of this situation, this paper presents a method of recovering bit error control information based on block transform and variable length coding to improve the transmission quality. The processing is as follows: Firstly, by adding the extended synchronization code to the coded stream to control the error within one line, the error detection is carried out on the decoding side and the original information is reconstructed by using the error recovery algorithm. This method only needs to make small modification to the encoder, and the added information redundancy is very small. The experimental results show that the quality of the reconstructed image is obviously improved after using this method.