Digital image watermarking have been developed widely in recent years. One of the most important applications of digital image watermarking is medical applications. Image watermarking can be used in medical images for several purposes. It’s used to protect the patient’s information from unauthorized people. In addition, it can be used for authentication if the patient lost his/her image. Moreov...

Digital watermarking is the processing of combined information into a digital signal. A watermark is a secondary image, which is overlaid on the host image, and provides a means of protecting the image. In order to provide high quality watermarked image, the watermarked image should be imperceptible. This paper presents different techniques of digital image watermarking based on spatial & frequ...

With the increasing use of internet and major development in technology, transmission of digital media is being affected by a large number of illegal interventions. As a valuable solution to this, watermarking provides a secure way for channelizing the digital media (image, audio or video). Digital Watermarking is a method of embedding data (watermark) into a host image without degrading its or...

The digital revolution in digital image processing has made it possible to create, manipulate and transmit digital images in a simple and fast manner. The adverse affect of this is that the same image processing techniques can be used by hackers to tamper with any image and use it illegally. This has made digital image safety and integrity the top prioritized issue in today’s information explos...

This paper presents a method for blind digital watermarking of color images. The proposed scheme performs a decorrelation of the RGB color bands of the image to be watermarked using a Karhunen– Loève transform (KLT), then marks the coefficients of the KLT of the first band obtained. The novelty of the method resides in the fact that the KLT basis images used for the transforms are not related t...

Recently it was shown that, in some situations, blind watermarking can perform as well as watermarking schemes with the host signal available to the decoder. In this paper, blind watermarking of colored Gaussian host signals in the presence of filtering and additive Gaussian noise attacks is discussed. Three suboptimal but practical schemes are compared with a scheme where the host signal is av...

Abstract Nowadays, multimedia security is a major issue. Images, video, audio, and text files lose credibility in most times, because they face several attacks related to illegal distribution, duplication, manipulation of the information conveyed by them. Digital watermarking an important tool for protecting digital content. This paper introduces efficient hybrid image scheme. It consists two s...

One of the most important practical problems of blind Digital Watermarking is the resistance against desynchronization attacks, one of which is the Stirmark random bending attack in the case of image watermarking. Recently, new blind digital watermarking schemes have been proposed which do not suffer from host-signal interference. One of these quantization based watermarking scheme is the Scala...

With the tremendous expansion of the Internet and multimedia technologies in the recent past, digital media is being manipulated more frequently. Digital watermarking technologies are one of the best solutions for authentication and copyright protection of digital data. In this paper, we applied our lossless image authentication technique on different datasets, random images and also on differe...

In this paper a wavelet-based logo watermarking scheme is presented. The logo watermark is embedded into all sub-blocks of the LLn sub-band of the transformed host image, using quantization technique. Extracted logos from all sub-blocks are merged to make the extracted watermark from distorted watermarked image. Knowing the quantization step-size, dimensions of logo and the level of wavelet tra...