Difference Expansion Based Reversible Data Hiding Scheme for Watermarking

Abstract

Reversible Data Hiding is a lossless data embedding technique which embeds a message code into a digital image in a reversible method. Difference Expansion (DE) is used for reversible data embedding. In this paper, a DE based scheme is used to minimize the auxiliary information being embedded and to increase the length of the watermark. The concepts discussed in this paper are: Embedding, Extraction and Restoration of the embedded data with minimal distortion. The redundancy in the image has been explored to observe reversibility. PSNR, Watermark Length and Payload Capacity are the metrics used to analyze the performance. It was concluded that by using reversible data hiding, more data could be embedded with minimal loss in information compared to other methods.