Computer Science ›› 2017, Vol. 44 ›› Issue (12): 100-104.doi: 10.11896/j.issn.1002-137X.2017.12.020

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Reversible Image Watermarking Algorithm Based on Multi-scale Decomposition and Prediction Error Expansion

ZHANG Zheng-wei, WU Li-fa and YAN Yun-yang   

  • Online:2018-12-01 Published:2018-12-01

Abstract: In view of the contradiction between the embedding capacity and the visual quality of the existing reversible image watermarking algorithm,a reversible image watermarking algorithm based on multi-scale decomposition and prediction error expansion was proposed.Firstly,the original image is decomposed into homogeneous and non-homogenous blocks by multi-scale decomposition.Then,the watermark information is embedded by the prediction error expansion of homogeneous blocks.Finally,based on the calculation of non-homogenous block information entropy,the non-homogenous blocks are selected according to the amount of embedded watermark information,and the remaining watermark information is embedded in the middle and high frequency by integer wavelet transform.Experimental results show that the proposed algorithm is easy to implement and is completely reversible,and it can effectively improve the watermark embedding capacity and has higher visual quality.

Key words: Reversible image watermarking,Prediction error expansion,Integer wavelet transform (IWT),Multi-scale decomposition,Visual quality

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