DCTyinxie.rar_DCT image matlab_DCTyinxie_dct 隐写_steganography_图像

function [ count, msg, result] = hidedctadv_3point( image, imagegoal, msg, key, alpha,MD) frr = fopen( msg, 'r'); [ msg, count] = fread( frr , 'ubit1'); fclose( frr) ; data0 = imread( image) ; data0 = double( data0)/255; data = data0(:,:, 1 ) ; T = dctmtx( 8) ; DCTrgb = blkproc( data, [ 8 8 ] , 'P1* x* P2 ', T, T') ; % 产生随机的块选择, 确定图像块的首地址 [ row, col] = size( DCTrgb) ; row = floor ( row/8) ; col = floor( col /8) ; % a = zeros( [ row col] ) ; % [ k1, k2] = randinterval( a, count, key) ; rand('seed',key); indk = randperm(row*col); indk = indk(1:128); [k1,k2] = ind2sub([row,col],indk); for i = 1:128 k1( 1, i) = ( k1 ( 1, i) - 1) * 8 + 1 ; k2( 1, i) = ( k2 ( 1, i) - 1) * 8 + 1 ; end % 信息嵌入 %temp = 0 ; %for i = 1:count % if xor(msg( i, 1), DCTrgb( k1( i) + 4, k2( i) + 1 ) > DCTrgb( k1( i) + 3, k2( i) + 2)) % temp = DCTrgb( k1( i) + 4, k2( i) + 1) ; % DCTrgb( k1( i) + 4, k2 ( i) + 1) = DCTrgb( k1( i) + 3 , k2( i) + 2) ; % DCTrgb( k1( i) + 3, k2 ( i) + 2) = temp; % end % % if DCTrgb( k1( i) + 4, k2( i) + 1 ) > DCTrgb( k1( i) + 3, k2( i) + 2) % DCTrgb( k1( i) + 3, k2 ( i) + 2) = DCTrgb( k1( i) + 3 , k2( i) + 2) - alpha; % 将原本小的系数调整得更小 % else % DCTrgb( k1 ( i) + 4, k2 ( i ) + 1 ) = DCTrgb ( k1 ( i) + 4, k2 ( i) + 1 ) -alpha; % end %end i=0; for j = 1:count i = i + 1; while 1 a(1) = DCTrgb(k1(i), k2(i) + 4); a(2) = DCTrgb(k1(i) + 2,k2(i) + 3); a(3) = DCTrgb(k1(i) + 5,k2(i) + 0); y = sort(a); if (y(3)-y(1)) > MD DCTrgb(k1(i) + 5,k2(i) + 0) = ( DCTrgb(k1(i), k2(i) + 4) + DCTrgb(k1(i) + 2,k2(i) + 3) )/2.000; i = i + 1; else break; end end if msg(j, 1) == 1 DCTrgb(k1(i) + 5,k2(i) + 0) = y(1) - alpha; else DCTrgb(k1(i) + 5,k2(i) + 0) = y(3) + alpha; end end % 信息写回保存 data = blkproc( DCTrgb, [ 8 8 ] , 'P1* x* P2 ', T', T) ; result = data0; result(:,:, 1) = data; imwrite( result, imagegoal) ;