In this paper, we propose an improved high capacity reversible watermarking scheme with capacity control. By introducing reversible contrast mapping (RCM) transform and difference expansion (DE) technique into our scheme, a compressed location map indicating watermarking locations is not needed. The proposed scheme explores important features of DE embedding and takes the advantage of RCM transform to embed a few indicative flags instead of the location map for DE embedding. It improves the distortion performance at low embedding bit-rate and solves the capacity control problem. The scheme can also achieve high capacity.
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