function rw = wm_extrJ此函数为提取过程输入：J为水印嵌入的图像；输出：rw为提取的水印一层小波分解LLLHHLHH = dwt2Jhaar;=======计算avr_LH======mn = sizeLH; avr_LH = 0;=======计算avr_HL======m0n0 = sizeHL; avr_HL = 0;判断嵌入的子带if avr_LH = avr_HL

function rw = wm_extr_type1(loca)

[mm,nn] = size(loca); index = 1; %取出2*2的块 for k = 1:2:mm-1 for kk = 1:2:nn-1 tem = loca(k:k+1,kk:kk+1); a11 = tem(1,1); a12 = tem(1,2); a21 = tem(2,1); a22 = tem(2,2); %-------a11+a21 >= a12+a22则水印为0，否则为1------- if a11 + a21 >= a12 + a22 rw(index) = 0; else rw(index) = 1; end index = index + 1; end
end end