Image compression is the application of data compression in digital images. Image compression can be lossy or lossless. This document attempts to implement basic JPEG compression using only basic MATLAB functions. In this work, lossy compression techniques have been used, where data loss can not affect the clarity of the image in this area. Image compression solves the problem of reducing the amount of data needed to represent a digital image. It is also used to reduce redundancy which is no more than avoiding duplic ....etc

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SUMMARY:
In this article, we strive to present a general introduction of steganography, or concealment, as sometimes just is not known. Then we turn to data hiding in images. In considering these data hiding techniques, we have in mind, Bender's technical characteristics, such as data loss, the cover should be minimized and hidden data should be made as immune as possible attack data manipulation cover. Steganography in images really come of age with the invention of fast, powerful computers. The software is easily available from the Internet a ....etc

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i have needed dwt and dct based image watermarking code using matlab for my academic purpose. please help me and how can i collect this code ....etc

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matlab code for copy move forgery detection using dct

%L = imread('images/lena3.jpg');
L = imread('images/Toronto2_F.png');
L=rgb2gray(L);
figure(1);
imshow(L);

b=256; % block size used to look for duplicates
b1=sqrt(b);
Nn = 5; % how many close rows to check
Nd = 15; %Threashold
Nc=26; % Truncate PCA at this length
Nt=26;

% calculate the total size of the image
n = numel(L);

b2 = sqrt(n)-sqrt(b)+1;
% calculate Nb
Nb= power((sqrt(n)-sqrt(b)+1),2);

% the matix of Nc plus the position
M=zeros(Nb, Nc);
% temp index array
Mi = zeros(Nb, 2); ....etc

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