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置乱均匀性的优度拟合统计分析 被引量:1

Image Scrambling Measurement Based on Chi-square Statistic
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摘要 借用数理统计中的方法,在"理想"置乱像素的随机变化和各像素灰度变化值相互独立的假设下,利用统计量评价合乎"理想"置换的程度.从某个小区域的像素灰度值的概率分布入手,提出基于2χ拟合优度统计量及其p值的置乱度评价方法,并对Arnold置乱、抽样置乱作出评价,实验结果表明,这种综合置乱度与人类感官知觉相符合,说明了该方法的有效性和实用性. A new measure of image scrambling degree based on the method of Chi square good of fitness hypothesis testing and pixel independent assumption is proposed.By testing the randomness of any specific region scrambled by the Arnold and Sampling transformation,experiments show that these Chi-square statistics and p-values have good consistency with the inspection result of human visual system.
出处 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2010年第6期778-781,共4页 Journal of Xiamen University:Natural Science
基金 国家自然科学基金资助项目(10226028) 福建省自然科学基金资助项目(20060220) 福建省教育厅A类科技项目(JA08216) 泉州市科技计划项目(2009Z53 2009Z54)
关键词 置乱程度 2χ拟合优度 评价 scrambling degree Chi-square good of fitness evaluation
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