数字水印-实验报告(共8页).doc

基于DCT变换域的水印嵌入和提取一、原始图像被随机攻击的源程序：% function random_damage()function random_damage()file_name = tt.jpg;oriwat_img = imread(file_name);% compute the sizeH = size(oriwat_img, 1);W = size(oriwat_img, 2);% 随机产生行、列，破坏row1 = unidrnd(512);row2 = unidrnd(512);column1 = unidrnd(512);column2 = unidrnd(512);if(row1 row2) temp = row1; row1 = row2; row2 = temp;endif(column1 column2) temp = column1; column1 = column2; column2 = temp;end