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archana

need help

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Hi, This is Archana, an engineering student. I am working on a project in steganography using matlab. For the purpose of hiding the message in the bmp image. I am using the Least Significant Bit (LSB) technique. The problem I am facing is that for the message to be hidden I need to convert the pixel values of the cover image into binary values. I have a code obtained in one of the matlab websites which works fine when i just convert some text data into binary. But when i try to convert the pixel values into binary the program goes into an indefinite loop and never comes out of it. I am not able to debug this error. I am pasting the code below. I need a solution for this error. function [bindat, binmat] = readdata(filename); % Funfunction [bindat, binmat] = readdata(filename); % Purpose: Read in the data % filename must be a string % binmat is the resulting matrix of binary. binstream is used for user's % verification of bindat % bindat is the resulting stream of binary data % Initialize bindata bindata = []; % Open the file fid = fopen(filename,'rb'); % Scan the contents of the file. Scan in the contents as characters. charstream = fscanf(fid, '%c'); % Convert the stream to uint8 intstream = uint8(charstream); % Convert uint8 to binary binmat = dec2bin(intstream); % Convert binary matrix to binary stream [row,col] = size(binmat); for i=1:row for j=1:col bindata = [bindata binmat(row*(j-1) + i)]; end end bindat= bindata; % Close the file fclose(fid);

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This does not belong in the AI forum. I'm moving it to the General Programming forum, since it is general programming related (Matlab coding in this case).

Cheers,

Timkin

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