  With the advancements in the field of digital image processing during the
last decade, digital image data hiding techniques such as watermarking,
Steganography have gained wide popularity. Digital image watermarking
techniques hide a small amount of data into a digital image which, later can be
retrieved using some specific retrieval algorithms to prove the copyright of a
piece of digital information whereas, Steganographic techniques are used to
hide a large amount of data secretly into some innocuous looking digital
medium. In this paper we are providing an up-to-date review of these data
hiding techniques.
