LSB_test.zip_LSB_LSB steganography_steganography_turbo code

% ............ Reading the user input (image/ Video)...............% [filename,pathname] = uigetfile({'*.jpeg;*.jpg;*.png;*.bmp'},'Enter the Image File'); watermark = imread(filename); figure, imshow(watermark); % Original Image [hgt wdt comp]=size(watermark); % Taking the dimensions of the Original image binary_image = dec2bin(watermark, 8); % Converting the Image pixels from Decimal to Binary [bin_hgt bin_wdt] = size(binary_image); % Taking the dimensions of the Binary image N=bin_hgt*bin_wdt; bits_watermark= reshape(binary_image', 1,N); % reshaping the binary image to a single bit stream Transmit_SIG= str2num(bits_watermark'); convocode = poly2trellis(3,[5 7]); watermark_convo=convenc(Transmit_SIG,convocode); % Applying the convolutional codes N2=length(watermark_convo); % % .............. Modulation..............% M=2; % Order of modulation Scheme Mod = modem.pskmod(M); Modulated_sig = modulate(Mod,watermark_convo); Modulated_sig_without = modulate(Mod,Transmit_SIG); i=1; %.............. Noise + Channel ..........% % n1 = 1/sqrt(2)*[randn(1,N2) + j*randn(1,N2)];% white gaussian noise % n1=n1'; % % % Y = watermark_convo + 10^(-1)*n1; Y = awgn(Modulated_sig,i); Y_without = awgn(Modulated_sig_without,i); %............. Demodulation .............% Dem= modem.pskdemod(M); Demodulated_sig = demodulate(Dem, Y); Demodulated_sig_without = demodulate(Dem, Y_without); decoded_watermark=vitdec(Demodulated_sig,convocode,35,'trunc','hard'); SIG_RECV_A= reshape(decoded_watermark',bin_wdt,bin_hgt); SIG_RECV_B= SIG_RECV_A'; SIG_RECV_C= reshape(Demodulated_sig_without,bin_wdt,bin_hgt); SIG_RECV_D= SIG_RECV_C'; Recvd_SIG_A= bin2dec(num2str(SIG_RECV_B)); reconstructed_watermark= reshape(Recvd_SIG_A, hgt, wdt, comp); Recvd_SIG_C= bin2dec(num2str(SIG_RECV_D)); reconstructed_watermark_without= reshape(Recvd_SIG_C, hgt, wdt, comp); % Final_recvd= unit8(Recvd_SIG_B(:,:,:)); Final_reconstructed_watermark= uint8(reconstructed_watermark(:,:,:)); Final_reconstructed_watermark_without= uint8(reconstructed_watermark_without(:,:,:)); % figure, imshow(Final_reconstructed_watermark); % psnr(watermark,Final_reconstructed_watermark) figure, imshow(Final_reconstructed_watermark_without); psnr(watermark,Final_reconstructed_watermark_without); peaksnr=psnr(watermark,Final_reconstructed_watermark_without); fprintf(' The Peak-SNR value is %0.4f\n', peaksnr); imwrite(Final_reconstructed_watermark_without, 'noiseimage.bmp'); % nErr1 = size(find([Transmit_SIG - decoded_watermark]),2); % % PSNR1=[35 52] % PSNR2=[12 13 16 43 49 55 60] % x=[3 6 9 12 15 18 21] % % x1=[3 6] % % % hold on % plot(x1,PSNR1); % plot(x1,PSNR2);