The paper proposes a method for tamper proofing digital images using the technique of digital watermarking. Many a times the published images are subject to tampering to an extent that the facts conveyed in the original image are distorted. The mechanism presented here describes a method for detecting the regions in image that were subject to illegal modifications. The method also can detect th...

Digital watermarking has been proposed to increase the digital data security, confidentiality and integrity. Satellite image watermarking is a special category of image watermarking in the sense that the images have special requirements. Particularly, watermarked satellite images should not differ perceptually from the original counterparts, because the purpose of taking the image must not be v...

Digital Watermarking is not a new name in the technology world but there are many new issues arise related with watermark. This paper surveys recent advances in watermarking techniques in digital images. The aim of digital watermarking is hidden information added into content of multimedia. In this paper, DCT technique is used and when size of image is increase then also increases PSNR without ...

The rapid growth of digital multimedia technologies brings tremendous attention to the field of digital watermarking. The owner or the distributor of the digital images can insert unique watermark into copies for different customers or receivers, which will be helpful to identify the source of illegal copies. Watermarking embeds a secret message into a cover multimedia data. In media watermarki...

In today’s life need of security is require in digital media due to the extensive use of digital media applications, multimedia security and copyright protection has gained tremendous importance. Digital watermarking is technology used for various applications. In field of digital media like copyright protection, Authentication etc. A lot of techniques are available for protecting the copyright...

Digital images are very easy to manipulate, store, publish and secondary creation this juggle will lead to serious consequence in some applications such as military image, medical image. So, integrity of digital image must be authenticated. Tools that help us establish the authenticity and integrity of digital media are thus essential and can prove vital whenever questions are raised about the ...

Digital watermarking is a technique for inserting ownership information to the digital data to prove the authenticity. A digital watermarking is perceptually invisible to prevent obstruction of the original image. It is also used for tamper proofing, broadcast monitoring, covert communication etc. In this paper, a wavelet-based watermarking approach for hiding watermark image in color host imag...

Digital image authentication is an essential attribute for protecting digital image from piracy and copyright violator. Anti-piracy, digital watermarking, and ownership verification are some mechanisms evolving over the years for achieving digital image authentication. Cryptographic primitives, such as hash function, digital signature, and message authentication codes are being used in several ...

A digital image watermarking algorithm based on fast curvelet transform is proposed. Firstly, the carrier image is decomposed by fast curvelet transform, and, the watermarking image is scrambled by Arnold transform. Secondly, the binary watermarking image is embedded into the medium frequency coefficients according to the human visual characteristics and curvelet coefficients. Experiment result...

The pivotal purpose of this paper is to introduce a scheme for watermarking of digital images in which one can embed some secret text in an encrypted manner and a secret image more than once in the host image, starting from different pixel positions based on the key. All this can be done without violating any of the desirable properties of the standard watermarking algorithms. The key plays a p...