为了压缩数据，LZ 77算法使用对匹配数据的引用来取代数据部分。匹配数据已经通过编码器和解码器传递。
To compress data, the LZ77 algorithm replaces portions of the data with references to matching data that has already passed through both the encoder and the decoder.
如果开始出现的是 0 ，那么这个规则需要改变，但效果是一样的，因为编码器和解码器都遵循这一规则。
This rule can be inverted to store a 0 if the run begins with a 0 bit, but the effect is the same as long as both the encoder and the decoder of the inversion list agree on this detail.
随后，本文在PC机上采用VC编写了改进后的MPEG - 4视频编码器和解码器的软件，验证了对算法改进的可行性。
Later this paper implements the software of modified video encoder and decoder of MPEG-4 using VC on PC platform, which verifies feasibility of modified algorithms.
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