针对一种抗JPEG编码的密写方法，可由图象分块特性定义一个块效应参数作为统计检验量，并设定阚值从而判断秘密信息是否存在。
A block-based parameter can be defined and a threshold value chosen to detect the blockiness introduced by an anti-JPEG steganographic embedding.
不能被调用或者实例化。可以用来判断实例是否为字符串或者字符编码。
It cannot be called or instantiated, but it can be used to test whether an object is an instance of or . isinstance(obj, basestring) is equivalent to isinstance(obj, (str, unicode)).
不能被调用或者实例化。可以用来判断实例是否为字符串或者字符编码。
It cannot be called or instantiated, but it can be used to test whether an object is an instance of or . isinstance(obj, basestring) is equivalent to isinstance(obj, (str, unicode)).
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