gusucode.com > 数字水印算法实现(matlab程序包),包含有DCT水印嵌入算法源码程序 > watermark综述+代码/lsb_recover.m
%Name: Chris Shoemaker %Course: EER-280 - Digital Watermarking %Project: Least Significant Bit Substitution % Watermark Recovery clear all; % save start time start_time=cputime; % read in watermarked image file_name='lsb_watermarked.bmp'; %file_name='_lena_std_bw.bmp'; watermarked_image=imread(file_name); % determine size of watermarked image Mw=size(watermarked_image,1); %Height Nw=size(watermarked_image,2); %Width % use lsb of watermarked image to recover watermark for ii = 1:Mw for jj = 1:Nw watermark(ii,jj)=bitget(watermarked_image(ii,jj),1); end end % scale the recovered watermark watermark=2*double(watermark); % display processing time elapsed_time=cputime-start_time, % read in original watermark %file_name='_copyright_large.bmp'; %orig_watermark=imread(file_name); % scale and display recovered watermark figure(2) imshow(watermark,[]) title('Recovered Watermark')