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US08457426B1 Method and apparatus for compressing a document using pixel variation information 有权
使用像素变化信息压缩文档的方法和装置

Method and apparatus for compressing a document using pixel variation information
Abstract:
A method and apparatus for providing document compression. In some embodiments, the method includes converting a document into a grayscale image, for each gradient component of the grayscale image, creating a monochrome image region, determining pixel variation information for the monochrome image region, and selecting the monochrome image region for a binary mask if the pixel variation information satisfies dynamic threshold data and creating a compressed document using the binary mask.
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