Image encryption derives from the early classic encrypted theories . its purposes is to encrypt a color image . any scene and outline of the old image does n ' t exist in the encrypted image and the deencrypted image is the same as the old one 数字图象加密源于早期的经典加密理论,其目的是将一幅给定的图象按一定的变换规则在空域或频域将其变换为一幅杂乱无章的图象,从而隐藏其图象本身的真实信息。
Dkow is capable of modeling and reasoning static domain knowledge , including domain structures , concepts and properties of the concepts , and the relations among concepts , etc . in order to apply the power of domain ontology to express the semantic information of web data , the author presents an algorithm named dtd generating from domain ontology ( dtdgdo ) that maps a given ontology to a document type definition ( dtd ) based on the transformation rules 作者提出了一种基于领域本体的web数据语义信息的表示方法,设计了dkow构建的形式化领域本体到相应dtd的生成算法dtdgdo 。作者在属性定义方面增强了现有ecfgs方法对dtd模型的定义,设计了生成算法dtdgdo的三类转换规则:重组规则、变换规则、基数规则。