Invoice printing just has two-color printing, so invoice font image can be seen as binary image. To embed watermarks into invoice image, the pixels need to be flipped. The more huge the watermark is, the more the pixels need to be flipped. We proposed a new pixels flipping method in invoice image for huge watermarking capacity. The pixels flipping method includes one novel interpolation method ...

Both watermark structure and embedding strategy affect robustness of image watermarks. Where should watermarks be embedded in discrete cosing transform (DCT) domain in order for the invisible image watermarks to be robust? Though many papers in the literature agree that watermarks should be embedded in perceptually significant components, dc components are explicitly excluded from watermark emb...

We propose a watermarking algorithm for polygonal meshes based on the modification of the Laplacian coordinates. More specifically, we first compute the Laplacian coordinates (x,y,z) of the mesh vertices, then construct the histogram of the lengths of the (x,y,z) vectors, and finally, insert the watermark by altering the shape of that histogram. The watermark extraction is carried out blindly, ...

Digital video data distribution through the internet is becoming more common. Film trailers, video clips and even video footage from computer and video games are now seen as very powerful means to boost sales of the aforementioned products. These materials need to be protected to avoid copyright infringement issues. However, these materials are encoded at a low bit-rate to facilitate internet d...

Digital video data distribution through the Internet is becoming more common, and is now seen as a powerful marketing media by the entertainment industry. These materials need to be protected to avoid copyright infringement issues. However, they are encoded at a low bit-rate to facilitate Internet distribution and this poses a challenge to the watermarking operation. In this paper we present an...

In this paper we propose a robust watermarking algorithm for 3D mesh. The algorithm is based on spherical wavelet transform. Our basic idea is to decompose the original mesh into a series of details at different scales by using spherical wavelet transform; the watermark is then embedded into the different levels of details. The embedding process includes: global sphere parameterization, spheric...

Due to high speed computer networks, the use of digitally formatted data has increased many folds.The digital data can be duplicated and edited with great ease which has led to a need for effectivecopyright protection tools. Digital Watermarking is a technology of embedding watermark withintellectual property rights into images, videos, audios and other multimedia data by a certainalgorithm .Di...

Image watermarking is most often used to prove that an image belongs someone and make sure the same as was originally produced. The type of for detection originality tampering known authentication-type watermarking. In this paper, a blind semi-fragile authentication method introduced. Although main concern in paper authenticating image, proving ownership additionally implemented. considers two ...

ABTRACT We propose a robust quantization-based image watermarking scheme, called the gradient direction watermarking (GDWM).This is based on the uniform quantization of the direction of gradient vectors. In GDWM, the watermark bits are embedded by quantizing the angles of significant gradient vectors at multiple wavelet scales. The proposed scheme has the following advantages: 1)Increased invis...

Quadrature Carrier Multiplexing (QCM) allows simultaneous transmission of two message signals over the same bandwidth using quadrature carriers of the same frequency. This principle is used in this work to improve embedding capacity in digital image watermarking using wavelet transforms. Biorthogonal wavelet filters are used to design Hilbert transform (HT) pair and symmetric filter coefficient...