Most violations of digital image copyrights are the cropping of some parts of an image such as a human face to apply to other images without permission. Serious cropped watermarked images which have various shapes, sizes and locations are difficult to verify the copyright. This thesis proposes a digital image watermarking method in the spatial domain using the prediction method, the Weber ratio...

A good quality watermarking scheme should have maximum PSNR, ideally Correlation Factor equals to 1 and should have maximum watermark information hiding capacity. In this paper, a robust digital color image watermarking scheme based on ‘Discrete Wavelet Transform’ is implemented. The RGB color space is converted into YUV color space and then V component is selected for watermark embedding. The ...

Recently, the watermarking is an important technique to protect copyright, which allows authentic watermark to be hidden in multimedia such as digital image, video and audio. Watermarking has been developed to protect digital media illegal reproductions and modifications. Traditionally, watermarking require complex procedures to embed and to extract watermark, such as randomizing the watermark,...

A novel watermarking technique is proposed to embed a semi-watermark in digital images. Before embedding the watermark, a M-dimensional vector is extracted from the original data. Watermarking is achieved by modifying this vector to another particular vector according to the private keys and the watermark. A dual-key system is used to reduce the chance for the removal of watermark. The watermar...

We present a new DCT-based block max-min algorithm for digital watermark embedding in images. Our algorithm uses intra-block bordering upon pixels relations to generate the watermarked image. The features of our method to embed the watermark are: (1) the watermark is perceptually invisible; (2) low loss of relevant information of the original image; (3) the watermark can be read only by using a...

The major application for watermark is protecting intellectual property rights. In this paper, a watermark scheme with circulation, based on nonoverlapping discrete wavelet transform (DWT) and singular value decomposition (SVD), is presented. First, the original host image and watermark image are divided into nonoverlapping blocks, respectively and to the former DWT and SVD is applied. Second, ...

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...

This paper introduces a robust image watermark based on an invariant image feature vector. Normalized Zernike moments of an image are used as the vector. The watermark is generated by modifying the vector. Watermark signal is designed with Zernike moments. The signal is added to the cover image in the spatial domain after the reconstruction process. We extract the feature vector from the modifi...

The aim is to get large Capacity embedding watermark in Audio & to improve strength of audio watermarking technique to intelligent attacks and simple signal exploitation attacks in existing digital Audio watermarking, this paper presented a large capacity digital audio watermarking using 24 bit true colour image used as watermark. The image is decomposed into R, G, B Components & Arnold transfo...

In this paper, a new watermark algorithm that based on wavelet packet transform and hybrid filter is proposed for watermark of digital images, which include many high frequency components. The proposed watermark algorithm is used in the high frequency component of image and applies watermark to the overall subband that include the lowest frequency band. And the watermark is embedded on input im...