High-capacity reversible q-ry data hiding with location map-free capability

This paper proposes a high capacity and high quality image data hiding scheme based on a causal predictor, predictor error expansion and a local activity indicator. The utilization of the secret data from Galois field GF(q), q ≥ 2 allows to embed more than one bit per pixel in compliance with a high quality of stego image. Moreover, special conditions for location map-free embedding are derived. Experimental analysis demonstrates the effectiveness of the proposed approach in achieving the high embedding capacity along with the high image fidelity.