A VQ-DCT Scheme for Grayscale Image Watermarking
نویسندگان
چکیده
منابع مشابه
A VQ-DCT Scheme for Grayscale Image Watermarking
In this paper, a hybrid watermarking scheme, that employs both DCT and VQ, has been presented. The authors have proposed a modification of the conventional LBG algorithm in this paper for designing the codebook to be used subsequently for compressing the image employing VQ. The watermark/logo is embedded in the constructed codebook after suitable DCT operations. The compression and reconstructi...
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A predictive image compression scheme that combines the advantages of vector quantization and moment preserving block truncation coding is introduced in this paper. To exploit the similarities among neighboring image blocks, the block prediction technique is employed in this scheme. If a similar compressed image block can be found in the neighborhood of current processing block, it is taken to ...
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In this paper a wavelet-based logo watermarking scheme is presented. The logo watermark is embedded into all sub-blocks of the LLn sub-band of the transformed host image, using quantization technique. Extracted logos from all sub-blocks are merged to make the extracted watermark from distorted watermarked image. Knowing the quantization step-size, dimensions of logo and the level of wavelet tra...
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In this paper a wavelet-based logo watermarking scheme is presented. The logo watermark is embedded into all sub-blocks of the LLn sub-band of the transformed host image, using quantization technique. Extracted logos from all sub-blocks are merged to make the extracted watermark from distorted watermarked image. Knowing the quantization step-size, dimensions of logo and the level of wavelet tra...
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The need for displaying one‘s own multimedia content on the internet is increasing day by day. With the exponential growth of internet and high speed networks operating through out the world it’s a challenging task to protect copyright of an individual’s creation. Digital watermarking provides a viable solution to protect copyright and authenticate the ownership of an intellectual property. In ...
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ژورنال
عنوان ژورنال: International Journal of Computer Applications
سال: 2010
ISSN: 0975-8887
DOI: 10.5120/642-898