Reversible data hiding for high dynamic range images using two-dimensional prediction-error histogram of the second time prediction

摘要

High dynamic range (HDR) images have become a wide-spread data format in multimedia communication due to its great expressiveness. In this paper, we present an efficient prediction-error histogram (PEH) based reversible data hiding (RDH) method for HDR images. To better exploit the correlation among encoded channels, a novel RDH scheme based on two-dimensional PEH of the second time prediction is designed. Firstly, the prediction-errors are calculated considering the encoding format of HDR images. Secondly, those pixels located in the complex regions are predicted for the second time by referring to the other channels. Thirdly, the two-dimensional PEH is generated to further optimize the embedding performance and maximize the embedding capacity (EC). Finally, an adaptive embedding strategy based on the two-dimensional PEH is employed to reduce the embedding distortion. With the second time prediction and the two-dimensional PEH strategy, our proposed method can greatly exploit the correlations among channels. Experimental results verify that the proposed method can significantly enlarge the embedding capacity and achieves an excellent embedding performance.