得出如下结论：DDN仍然是集团客户和对传输质量要求较高、信息量较大的客户的最佳选择。
I draw the following conclusion: DDN is still the best choice for group customers and the customers who require the service of large amounts of information and high transmitting quality.
先编码的位具有较大的信息量，反映了图像的轮廓，后编码的位反映了图像的细节。
The first coding bits have more information and reflect the image Outlines, the last coding bits reflect the image details.
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