ndungen(M,N,0.1);[fca1,ch1,cv1,cd1]=dwt2(im3,'bior3.7');fca2=(fca1-(1-tt)*e)/tt;im4=idwt2(fca2,ch1,cv1,cd1,'bior3.7');figure(6);imshow(uint8(im4),[]);title('解密图像小波重构');%置乱后图像的均值figure(7);subplot(221)imhist(uint8(im1));title('初始图像的直方图');subplot(222)imhist(uint8(fca1));title('ca1系数加密之后的直方图');....subplot(223)imhist(uint8(im3));title('加密之后的直方图');subplot(224)imhist(uint8(im4));title('解密之后的直方图');ssy=sum(sum(im3));%置乱后图像的均值uy=ssy/(M*N);vy=sum(sum((im3-uy)^2));ssx=sum(sum(im1));%原图像的均值ux=ssx/(M*N);vx=sum(sum((im1-ux)^2));Variancey=vy/uy;%置乱后图像的方差Variancex=vx/ux;%原图像的方差%置乱度DDD=Variancey/Variancex;etime(clock,t0)五.运行结果及分析总结1.运行结果:....灰度化处理图像近似低频水平分量低频垂直分量高频分量加密....灰度图像小波重构加密图像小波重构....解密图像小波重构020004000初始图像的直方图010020005001000c a1系数加密之后的直方图010020002000400060008000加密之后的直方图0100200020004000解密之后的直方图0100200
全文预览
