A new reversible watermarking scheme using the content-adaptive block size for prediction
A new reversible watermarking scheme using the content-adaptive block size for prediction
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一种使用内容自适应块大小进行预测的新可逆水印方案
DOI:
10.1016/j.sigpro.2019.05.035
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发表时间:
2019-11
影响因子:
4.4
通讯作者:
Xiang Shijun
中科院分区:
文献类型:
--
作者:
Zheng Hongchang;Wang Chuntao;Wang Junxiang;Xiang Shijun
Reversible watermarking aims to embed more messages in a cover image with less distortion. For reversible watermarking schemes (RWSs) using the prediction error expansion and histogram shifting (PEE-HS), the key point is to predict image pixels accurately. To obtain more accurate prediction, by taking into account the fact that there exist edges and textures in natural images, this paper designs a local predictor exploiting the content-adaptive block size for each to-be-predicted pixel. Specifically, in constructing the prediction context, the original to-be-predicted pixel is replaced by its rhombus-averaged version, aiming to result in the same prediction context for the embedder and decoder. A number of candidate block sizes are then set and the same number of prediction errors between the rhombus-averaged and predicted values are generated. Considering that the watermarking performance is measured with respect to the original pixels, a mechanism is thus devised to find a preferable content-adaptive block size leading to the minimum prediction error close to the difference between the original and predicted values. After generating prediction errors, we deploy the PEE-HS to design a new RWS exploiting the content-adaptive block size. Experimental results show that the proposed scheme outperforms the-state-of-the-art using the least-square-based predictor.
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DOI:
10.1109/tifs.2011.2145372
发表时间:
2011-09-01
影响因子:
6.8
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DOI:
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2012-03
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2012 IEEE International Conference on Information Science and Technology
影响因子:
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影响因子:
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