Reversible Image Watermarking Using Interpolation Technique

TLDR

Watermarking embeds information into digital media, and reversible schemes allow perfect restoration of the original image after data extraction. The study proposes a reversible watermarking scheme that uses interpolation to embed large covert payloads with imperceptible changes. The method embeds bits by adding to or leaving unchanged the interpolation error between the interpolated value and the original pixel. Experiments show that the scheme preserves high image quality while achieving greater payload capacity and higher fidelity than existing methods.

Abstract

Watermarking embeds information into a digital signal like audio, image, or video. Reversible image watermarking can restore the original image without any distortion after the hidden data is extracted. In this paper, we present a novel reversible watermarking scheme using an interpolation technique, which can embed a large amount of covert data into images with imperceptible modification. Different from previous watermarking schemes, we utilize the interpolation-error, the difference between interpolation value and corresponding pixel value, to embed bit ¿1¿ or ¿0¿ by expanding it additively or leaving it unchanged. Due to the slight modification of pixels, high image quality is preserved. Experimental results also demonstrate that the proposed scheme can provide greater payload capacity and higher image fidelity compared with other state-of-the-art schemes.