An Improved Reversible Watermarking Based on Pixel Value Ordering and Prediction Error Expansion

2020 ◽  
pp. 582-592
Author(s):  
Le Quang Hoa ◽  
Cao Thi Luyen ◽  
Nguyen Kim Sao ◽  
Pham Van At
Keyword(s):  
Prediction Error ◽  
Reversible Watermarking ◽  
Prediction Error Expansion ◽  
Pixel Value ◽  
Error Expansion

scholarly journals Hybrid Predictor and Field-Biased Context Pixel Selection Based on PPVO

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Hongyin Xiang ◽  
Jinsha Yuan ◽  
Sizu Hou
Keyword(s):  
Prediction Error ◽  
Reversible Data Hiding ◽  
State Of The Art ◽  
Prediction Errors ◽  
Embedding Capacity ◽  
Selection Technique ◽  
Expansion Strategy ◽  
Prediction Error Expansion ◽  
Pixel Value ◽  
Error Expansion

Most pixel-value-ordering (PVO) predictors generated prediction-errors including −1 and 1 in a block-by-block manner. Pixel-based PVO (PPVO) method provided a novel pixel scan strategy in a pixel-by-pixel way. Prediction-error bin 0 is expanded for embedding with the help of equalizing context pixels for prediction. In this paper, a PPVO-based hybrid predictor (HPPVO) is proposed as an extension. HPPVO predicts pixel in both positive and negative orientations. Assisted by expansion bins selection technique, this hybrid predictor presents an optimized prediction-error expansion strategy including bin 0. Furthermore, a novel field-biased context pixel selection is already developed, with which detailed correlations of around pixels are better exploited more than equalizing scheme merely. Experiment results show that the proposed HPPVO improves embedding capacity and enhances marked image fidelity. It also outperforms some other state-of-the-art methods of reversible data hiding, especially for moderate and large payloads.

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