DFT BASED INDIVIDUAL EXTRACTION OF STEGANOGRAPHIC COMPRESSION OF IMAGES

C. Rengarajaswamy

Abstract: A Novel scheme of Separable Extraction of concealed data and compressed image is proposed adopting a transform based compression over the encrypted data. Reversible data hiding is branched under Steganography. In this reversible data hiding the art of concealing a secret data over the cover image is practiced. More than that, the main ingredients that play the key role are encryption key and the data hiding key, the compression is performed in between the two processes i.e., encryption and data hiding, to create a spare space to accommodate the secret data. The main aim of this proposed scheme is to limit the distortion and to enhance a wide space for concealing of the secret data i.e., to increase the embedding rate. The compression here classified into lossy and lossless. Lossy compression best suits for image and audio (telephone conversation, etc.) whereas lossless compression needed in the text and videos. Hence to perform the lossless compression over a stegomized image and improve its secrecy, DFT is performed after Encryption

Keywords: DFT, Data Embedding, RDH, Separable RDH, Compression

DOI: https://doi.org/10.15623/ijret.2014.0302034