# 压缩损失，伪像，视觉质量

当压缩视频经过解压缩处理并呈现给用户时，压缩伪像（*compression artifacts*）是压缩视频中比较明显的失真现象。其它的压缩信号中也有可能会存在压缩伪像。这些失真是由所涉及的有损压缩技术引起的。压缩算法的目标之一是在最大化压缩量的同时最小化其信号失真。但是，根据压缩算法和压缩量级的不同，压缩的数据会具有不同程度的质量损失或引入伪像。有的质量评估算法可以区分那些主观影响很小的失真和用户难以接受的失真，并且可以采取措施来优化最终的视觉质量。


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