It's a classic method to encode the constant Os in the differentiate vectors, but this way can not accommodate the 1s and the 10s, and the alter and run-length code can accommodate it.
但是不能很好的适应差分向量中连续的1和10交替的情况，交替与连续长度码可以很好的解决这个问题。
In order to suit for our bit stream file format, we choose run-length coding method to encode the coefficients.
为了配合专用的文件格式，我们采用的熵编码方式是游程编码。
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