为什么数据只能压缩一次? [英] Why can data be compressed only once?
问题描述
因此,压缩过程将获取二进制数据 A
块,并输出较小二进制数据 B
。 B
的什么特征使其无法再次通过此过程?
So the compression process takes a chunk of binary data A
and outputs a smaller chunk of binary data B
. What characteristics of B
make it unable to go through this process again?
推荐答案
<数据有一种叫做熵的信息:每个新位给出的新信息量。例如, 10101010101010101010
的熵很低,因为您不需要下一点就知道接下来会发生什么。完美的压缩算法可以将熵压缩到最大,因此每一位都可以提供信息,因此无法删除,从而使大小最小。
Data has something called entropy: the amount of new information each new bit gives. For example, 10101010101010101010
has low entropy because you don't need the next bit to know what comes next. A perfect compression algorithm would compress to maximum entropy, so every bit gives information and so cannot be removed, making the size a minimum.
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