Wavelet transform based watermark for digital images
نویسندگان
چکیده
منابع مشابه
A watermark for digital images
The growth of networked multimedia systems has magnified the need for image copyright protection. One approach used to address this problem is to add an invisible structure to an image that can be used to seal or mark it. These structures are known as digital watermarks. In this paper we describe two techniques for the invisible marking of images. We analyze the robustness of the watermarks wit...
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Robustness is the one of the essential properties of watermarking schemes. It is the ability to detect the watermark after attacks. A DWT-based semi-blind image watermarking scheme leaves out the low pass band, and embeds a pseudo random number (PRN) sequence (i.e., the watermark) in the other three bands into the coefficients that are higher than a given threshold T1. During watermark detectio...
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In this paper, a novel blind image watermark scheme is developed based on discrete wavelet transform (DWT). In order to make the watermark robust and transparent, the watermark is embedded in the average of wavelet blocks using the visual model based on the human visual system. Low-pass wavelet coefficients n least significant bits (LSBs) are adjusted in concert with the average. Simulation res...
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In this paper, an image-adaptive watermarking technique based upon a redundant wavelet transform is proposed. The redundant transform provides an overcomplete representation of the image which facilitates the identification of significant image features via a simple correlation operation across scales. Although the watermarking algorithm is image adaptive, it is not necessary for the original i...
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In this paper, we introduce a new multiresolution watermarking method for digital images. The method is based on the discrete wavelet transform (DWT). Pseudo-random codes are added to the large coe cients at the high and middle frequency bands of the DWT of an image. It is shown that this method is more robust to often proposed methods to some common image distortions, such as the wavelet trans...
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ژورنال
عنوان ژورنال: Optics Express
سال: 1998
ISSN: 1094-4087
DOI: 10.1364/oe.3.000497