Aimed at binaryzation,an algorithm is proposed,which is based on maximum image entropy of region.It incorporates three features,which are sharp change in part of image entropy's physicality,advantage of regional maximum based on overall changes,and the specific proportional distribution of gray between target and background.Image binaryzation is achieved,which uses ways of use ways of make a concrete analysis of concrete problems from complement's principle of part and overall.The algorithm is proved that i...