International Journal of Computer Applications (0975 – 8887) Volume 106 – No.11, November 2014 7 Review on Digital Video Watermarking Techniques Alka N. Potkar M.E. student (E&TC) Dr. D.Y. Patil SOE, Pune Saniya M. Ansari Asst. Prof (E&TC) Dr. D.Y. Patil SOE ,Pune ABSTRACT Electronic watermarking is a method whereby information can be imperceptibly embedded into electronic media, while ideally being robust against common signal manipulations and intentional attacks to remove the embedded watermark. This study evaluates the characteristics of uncompressed video watermarking techniques in terms of visual characteristics, computational complexity and robustness against attacks and signal manipulations. The foundations of video watermarking are reviewed, followed by a survey of existing video watermarking techniques. Representative techniques from different watermarking categories are identified, implemented and evaluated. General Terms Types of watermarking, Applications, Watermarking techniques, Attacks. Keywords Watermark; DWT; DCT 1. INTRODUCTION Video piracy has become an increasing problem particularly with the proliferation of media sharing through the advancement of Internet services and various storage technologies. Thus, research in copyright protection mechanisms, where one of which includes digital watermarking has been receiving an increasing interest from scientists especially in designing a seamless algorithm for effective implementation. Digital video watermarking involves embedding secret symbols known as watermarks within video data which can be used later for copyright detection purposes. There are three factors (robustness, security, perceptual fidelity) which are necessary for video watermarking system. The fast growth of internet and applications using digital multimedia technologies has put the accent on the need to provide copyright protection to multimedia data. A digital watermark can be described as a visible or preferably invisible identification code that is permanently embedded in the data. So it can remain present within the cover media after any decoding process. 2. TYPES OF DIGITAL WATERMARK Watermarks and watermarking techniques can be divided into various categories in various ways. The watermarks can be applied in spatial domain [3]. An alternative to spatial domain watermarking is frequency domain [3][9] watermarking. It has been pointed out that the frequency domain methods are more robust than the spatial domain techniques. Different types of watermarks are shown in the figure1. Figure 1: Types of watermarking techniques Watermarking techniques can be divided into four categories according to the type of document to be watermarked as follows. Watermarking techniques can be divided into four categories according to the type of document to be watermarked as follows.  Image Watermarking  Video Watermarking  Audio Watermarking  Text Watermarking According to the human perception, the digital watermarks can be dividing into three different types as follows.  Visible watermark  Invisible-Robust watermark  Invisible-Fragile watermark  Dual watermark Watermarking is the process of inserting secret information (watermark) into digital multimedia (images, audio and video) by taking into account the limitations of the human perception system. Digital watermarking is the process of embedding digital code into digital multimedia (images, audio and video Video Spatial domain Frequency domain Watermarking According to Working Domain According to Type of Document According to Human Perception According to Application Text Image Audio Invisible Visible Source Based Destination Based Robust Fragile Private Public Invertible Non- Invertible Quasi- Invertible Nonquasi- Invertible