Fatma El-Zahraa Abou-Chadi

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In this paper a simple and robust Contourlet-based image watermarking technique for copyright protection is presented. The main idea is to utilize the flexible representation of images provided by the Contourlet transform in designing a robust watermarking technique. The watermark is embedded into different bands to resist different kinds of signal(More)
In this paper, computed tomographic (CT) images were investigated to develop a computer-aided system to discriminate different lung abnormalities. These were done by analyzing Data recorded for healthy subjects and patients suffering from lung asthma and emphysema diseases were considered. The techniques for utilized feature extraction included statistical,(More)
Block Truncation Coding (BTC) is a fast moment preserving lossy image compression technique. This paper proposes a two-level compression scheme. In the first level of compression, the blocks are categorized into high-detail blocks and low-detail blocks. The high detail blocks are stored or transmitted in the form of a bit plane (16 bits), and two(More)
Digital watermarking is hiding the information inside a digital media. Its widely used in copyright protection of digital images. This paper presents a comparative study of digital watermarking techniques in frequency domain and explores the role of Discrete cosine transform DCT, Discrete wavelet transform DWT and Contourlet transform CT in generating(More)
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