Watermarking Techniques - A Study

From the decades the development in the internet technologies is increasing more widely in daily life media data as images, audios, videos etc. Due to its facile use the media data can be transmitted and copied also. Because of some legal issues media data should be protected against uncertified users and operations. To protect the exploit of the media data watermarking technique is used. This is the modern technology to secure the data by encrypting information inside some digital media and is used for copyright protection. This paper dealt with the theories existed from past to present that helps to understand the watermarking technique for protection of medical images. It is important to maintain the authenticity of patient information security system is to be required.