Digital image scrambling degree evaluation method based on region similarity
Huxiong Li · Jisuanji gongcheng yu sheji · 2012
Digital image scrambling degree is one of the most important aspects of evaluating digital image scrambling algorithm,it has significant effects on the research of digital watermark algorithm.A quantitative metric is proposed to objectively evaluate the quality of image scrambling degree.The scrambled image is divided into several blocks in order to obtain the several blocks feature matrix.After,we could get the image scrambling degree by calculating grey relation degree between the reference sequence which is obtained by the particular image block and the comparatives sequence which is constructed by the several blocks.The results of the experiment have suggested that the digital image scrambling degree evaluation method is the same as all of sorts image encrypting.The resulting digital image scrambling degree is accordant with visual subjective evaluation,it would not differ a lot for the sake of the changing of its former image as well.