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Improved Reversible Visible Watermarking Based on Adaptive Block Partition

  • Guangyuan Yang
  • Wenfa Qi
  • Xiaolong Li
  • Zongming Guo
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10431)

Abstract

Visible watermarking is a useful technique to perceptually protect the copyright while the reversible technique can help losslessly recover the original image. A reversible visible image watermarking scheme based on difference-expansion and adaptive block partition is presented in this paper. First, the cover image is divided into non-overlapped \(k \times k\) sized blocks. Then, an adaptive visual effect factor for each block is calculated by non-watermarked blocks and estimated watermarked blocks in its neighborhood to embed the visible watermark. Since the information in watermarking region is not used, authorized users can exactly recover the original cover image without the availability of the watermark in the recovery process. Afterwards, one watermark bit is embedded into each block based on the conventional difference-expansion method. To reduce the exceeding number which denotes the pixel whose values is larger than 255 or less than 0 generated in watermark bit embedding procedure, an adaptive block partition strategy is utilized in the proposed method. Experimental results show that compared with the related work, the proposed method can greatly reduce the exceeding numbers and the visual effect is better at the same time.

Keywords

Reversible visible watermarking Adaptive block partition Human visual system 

Notes

Acknowledgement

This work is supported by National Natural Science Foundation of China under contract Nos. U1636206 and 61572052.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Guangyuan Yang
    • 1
  • Wenfa Qi
    • 1
  • Xiaolong Li
    • 2
  • Zongming Guo
    • 1
  1. 1.Institute of Computer Science and TechnologyPeking UniversityBeijingChina
  2. 2.Institute of Information ScienceBeijing Jiaotong UniversityBeijingChina

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