AUTHORS: R. Shanthakumari, S. Malliga
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ABSTRACT: In this paper, a robust and efficient digital image watermarking algorithm using the Slant transform is proposed for the copyright protection of images. This algorithm can embed or hide an entire image or pattern as a watermark such as an Institution’s logo or trademark directly into the original image. In the existing method a visible/invisible watermarking process for embedding and extraction a digital watermark into/form an image is carried out in hadamard transform domain using scaling factor. It is calculated with the help of the underlying cover image. This method facilitates in preserving ownership rights of the owner. In the proposed system, an adaptive visible/invisible watermarking scheme is done to prevent the privacy and preserving copyright protection of digital data with good energy compaction using Slant transform based on the scaling factor of the image. The value of scaling factor depends on the control parameter. The control parameter can be adjusted to make the watermarking scheme as either visible or invisible. The performance of the proposed algorithm is evaluated using various attacks. Results show that this algorithm is very robust and can survive up to 60% of all attacks. These attacks were tested on a number of test images of size 512×512×8bit, embedded with a watermark image of size 256×256×8 bits. The simplicity of the slant transform also offers a significant advantage in shorter processing time and ease of implementation
KEYWORDS: Copyright Protection, Digital Watermarking, Images, Slant Transform
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