LSB WATERMARKING THESIS

Insurance companies, hospitals as well as patients might want to modify the medical images for a number of reasons. In order to facilitate sharing and remote handling of medical images, we propose techniques to solve the problem of copyright protection and content authentication using robust and fragile watermarking respectively. However, digital form of medical image can easily be manipulated through image processing softwares. Watermarking tech- nology can be categorized into robust, fragile and semi-fragile watermarking, each serving for different purposes. As a result, it keeps the distortion small between the marked and the original images.

The proposed method uses integer wavelet transform and companding technique which can embed and recover the secret information as well as can restore the image to its pristine state. However, digital form of medical image can easily be manipulated through image processing softwares. Show full item record. The system first enhances the embedding capacity of a CT scan image by isolating the actual lung parenchyma unlike classical watermarking techniques, which use logical square or ellipse for isolating region of interest ROI. In the first part of this dissertation, we design a fragile watermarking system for the exact authentication of medical images. Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Consequently, it reduces the associated overhead usually required in most of the reversible watermarking techniques. Robust watermarks are well suited for copyright protection because thesos stay intact with the image under various manipulations.

lsb watermarking thesis

In order to facilitate sharing and remote wateermarking of medical images, we propose techniques to solve the problem of copyright protection and content authentication using robust and fragile watermarking respectively. Please use this identifier to cite or link to this item: Secondly, we select the salient regions in the normalized image based on feature points detected by Harris corner detector.

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Digital Image Watermarking Using LSB Method – eTheses

lxb In third part of the dissertation, we investigate the complete reversible watermarking system. As a result, it keeps the distortion small between the marked and the original images. The proposed method uses integer wavelet transform and companding technique which can embed and recover the secret information as well as can restore the image to its pristine state.

Experimental results reveal that the watermadking system detects both legitimate and illegitimate distortions. The proposed system authenticates the computed tomography CT scan medical images of thorax area against different distortions.

Watermarking tech- nology can be categorized into robust, fragile and semi-fragile watermarking, each serving for different purposes.

Digital Image Watermarking Using LSB Method

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated. The method utilizes the spatial domain watermarking and least significant bit LSB replacement method for embedding the watermark.

lsb watermarking thesis

The scheme is completely blind, that it does not require the original image to detect the watermark. The objective of this dissertation is to investigate how to protect a medical images, detect tampered images and recover the thesjs image using the technique of Digital Watermarking.

In the second part of the dissertation, we investigate an approach of robust watermarking for protection of medical images which ensures the security of medical images against geomet- rical distortions.

We thus address the issue of tolerating affine transformations in medical images that is hardly be found in existing schemes of medical image watermarking.

However, digital form of medical image can easily be manipulated through image processing softwares.

lsb watermarking thesis

This paradigm gave birth to number of applications in healthcare industry like teleconsulting, telesurgery and watermaring. In the proposed method we firstly normalize the medical image using image moments in order to make it invariant against geometric transformations.

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The system first enhances the embedding capacity of a CT scan image by isolating the actual lung parenchyma unlike classical watermarking techniques, which use logical square or ellipse for isolating region of interest ROI. The method takes advantage of block based watermarking and iterative optimization of threshold for companding, which avoids histogram pre and post-processing.

Experimental results show that the proposed method outperforms the existing reversible data hiding schemes reported in the literature. Watermarking is performed in Discrete Cosine Transform DCT domain of salient regions by adapting block based embedding.

In the first part of this dissertation, we design a fragile watermarking system for the exact authentication of medical images. The tampered images may be used for illegal purposes. Insurance companies, hospitals as well as patients might want to modify the medical images for a number of reasons. Secondly it embeds watermark only in region of non interest RONIthus not compromising the diagnosis value of medical image.

Show full item record. One of the examples is in the area of medical applications, where traditional diagnosis is being thesid by e-diagnosis.

Welcome to Pakistan Research Repository Due to development of latest technologies in the areas of communication and computer networks, present businesses are moving to the digital world for effectiveness, convenience and security. All these applications require the exchange of thesls images in digital format from one geographical location to another throughout the globe via a cheap and fast network such as Internet.