Abstract
Nowadays, Internet has become essential for living and running businesses smoothly; it has made things simpler like online transaction, online shopping, sharing images, videos, audios, messages on social media, uploading some important information on Google drives, etc. So the very first requirement is to secure and protect digital contents from any unauthorized access. Reversible Data Hiding (RDH) is one of the ways to provide security in digital content, through which useful information can be embedded in the digital content, and at the receiver’s end, the complete recovery of cover media as well as the embedded message is possible. In this digital era, digital images are most rapidly used for communication purposes; therefore, the security of digital images is in high demand. RDH in digital images has gained a lot of interest during the last few decades. This paper describes and investigates a systematic review on various RDH techniques for digital images, which can be broadly classified into five categories: Lossless Compression Based, Histogram Modification Based, Difference Expansion Based, Interpolation Based and Encrypted image Based techniques.
Keywords: Difference expansion, embedding capacity, encryption, histogram- modification, interpolation, lossless, predictionerror, reversible data hiding.
Graphical Abstract