Capacity control of reversible watermarking by two-thresholds embedding: Further results

Abstract

The classical threshold control of difference expansion reversible watermarking does not ensure a fine tuning of the embedding capacity and the simple partial embedding can introduce artifacts. The newly proposed two-thresholds embedding capacity control splits the image into two parts and marks them with consecutive threshold values. Intermediate capacity values between the ones provided by the thresholds are obtained by varying the ratio between the two parts. The method ensures a fine control of the capacity without introducing artifacts. This paper proposes a lower distortion version of the two-thresholds embedding reversible watermarking scheme. Experimental results are provided.