الفهرس 
CHAPTER 1 : Survey of digital forgery.Only 14 pages are availabe for public view
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Abstract
Today manipulation of multimedia (digital images or videos) has become
easy due to powerful computers, advanced photo-editing software packages and
high resolution capturing devices. Verifying the integrity of images and detecting
traces of tampering without requiring extra prior knowledge of the image content
or any embedded watermarks is an important research field.
This dissertation aimed to detect the forgery in images to achieve the integrity in
digital images. We introduce two techniques to detect the tampering in digital
images as follows:
- Investigating several techniques based on different types of Polar
Harmonic Transforms (PHTs in order to evaluate the effect of transform
domains in the quality of tampering detection. The good performance is
in favor of Polar Sine Transform (PST)-based tamper detection method.
- A hybrid robust technique for digital watermarking algorithm based on
Singular Value Decomposition (SVD), integer discrete cosine
transforms (Integer DCT) and chaotic 2-dimensional system is
proposed. Experiments conducted show that the embedded
watermarking image survives most of the common image processing
attacks and geometric distortions as noise addition, JPEG compression,
histogram equalization, scaling, filtering, rotation (rotating 90º, 180 º,
and 270 º), etc.