Watermark

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Watermark

An image in a piece of paper that may be seen more clearly when it is held up to light. This is used in printing some money and passports to prevent counterfeiting. For example, if one holds a $20 American bill up to light, one would see a watermark of Andrew Jackson's face.
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References in periodicals archive ?
Section 2 presents the proposed watermarking method that consists of watermark embedding and decoding.
Our proposed watermarking method foucus on two stages: embedding and detection.
Bhat, "A Simple Robust Digital Image Watermarking against Salt and Pepper Noise using Repetition Codes," International Journal on Signal & Image Processing, vol.
Arya, "A survey of frequency and wavelet domain digital watermarking techniques," International Journal of Scientific & Engineering Research, vol.
Figure 3(a) shows the original host MRI image of size 348x314 for watermarking. The chaotic maps used are the logistic map given in (1) with initial conditions x(0) = 0.25, r = 3.58 and x(0) = 0.56, r = 3.57 respectively at embedding side and chaotic watermark pattern of size 55x55 is considered for experiment.
This is another figure of merit of the digital image watermarking. It is a measure of perceptual level of the watermarked image.
The proposed watermarking scheme effectively embeds both the watermarks into original image and then extracts both the watermarks from the watermarked image.
In [25], Hasan and Hassan proposed a robust self-embedding watermarking scheme for self-correction and a fragile watermarking scheme for sensitive authentication.
The digital watermarking algorithms based on the type of host medium are divided into image watermarking, video watermarking, audio watermarking and text watermarking [21].
Though using SVDs gives satisfactory results in respect of robustness, but it is inefficient to provide security (the property of a watermarking scheme to nullify the chances of watermark extraction completely, is referred as security [2, 7]).
Both watermark insertion techniques and watermarking protocols determine the security level that a web system can achieve in implementing the copyright protection of digital content.
The LSB watermark is considered the simplest form of watermarking schemes.