| Summary: | Reversible data hiding(RDH) based on histogram shifting(HS) is the most common technology in current information hiding,especially for the combined method of difference extension and histogram shifting,which can achieve high embedding capacity and low image distortion.In this paper,a reversible information hiding method of bi-histogram shifting after compressed difference is proposed.The algorithm improves the defect of insufficient embedding capacity of the existing method based on histogram shifting by synthesizing three methods of compression,difference and optimized histogram shifting.At the same time,the processing method for the overflow of the image pixel value in the shifting process is also given.At the receiving end,not only can the data be completely extracted,but also lossless image recovery can be performed.After the experiment,a comparison is made with the four current popular schemes.Our method outperforms existing histogram shifting based algorithms in terms of embedding capacity.Compared with other methods,its embedded capacity improves by 23%,11%,57% and 93%.Experimental results show that the proposed method greatly increases the embedding capacity and can effectively realize reversible information hiding with large embedding capacity.
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