lsb_recover.rar_lsb_recover_watermark lsb

%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 = input('Type the photo file name ', 's'); 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=256*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') %imwrite(watermark,file_name ,'bmp'); imwrite(watermark,'C:\Users\EHM\Documents\MATLAB\code\Spatial Domain\1 lsb simple\result\extracted_watermark.bmp','bmp');