Publication: Rekabentuk satu teknik teraair berasaskan “wavelet” Untuk tujuan pengesahan dan pemulihan imej.
Date
2006-05
Authors
Chia, Chung Kwang
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Abstract
The Internet technology and image processing technique have become more and more advance. Since the distribution of multimedia content such as digital images across the internet has become easier, the image may be tampered and published by an illegal user. Thus, it is difficult to determine whether an image is authentic or not. In this dissertation, a watermarking technique for image authentication and recovery isproposed. In this scheme, image-content-related features are first extracted and embedded as a watermark into the wavelet domain of the image. In features extraction process, the image is first divided into non-overlapping and equal-sized block. Then for each block, the average of pixel intensities is calculated and the results will be used as the image features. Then, extracted watermark is used to detect whether the image was tampered or not. If the image has been modified, the watermark will be used to restore the tampered parts. The watermarking scheme can support both color and grayscale images. The experimental results indicated that the proposed algorithm is able to detect tampering on image as well as recovering the tampered parts.