Journal of Jishou University(Natural Sciences Edition) ›› 2020, Vol. 41 ›› Issue (6): 21-27.DOI: 10.13438/j.cnki.jdzk.2020.06.005

• Computer • Previous Articles     Next Articles

An Watermarking Algorithm Against Cropping Attack Based on SVD and DCT

YU Shuaizhen, ZHOU Jian, XIE Daoping   

  1. (Department of Electronics and Information Engineering, Anhui University of Finance & Econmics, Bengbu 233030, Anhui China)
  • Online:2020-11-25 Published:2021-02-04

Abstract: In order to improve the anti-attack capability  of watermarking system against cropping attack, this paper presents an anti-cropping watermarking algorithm based on multi-transform domain. The DCT transform is carried out on each segmentation region of the host image and the maximum coefficients of each segmentation region are extracted to form a new matrix. The encrypted watermark information is then embedded into the singular value transformation domain of this matrix. Experiments show that the algorithm can not only fully resist the single cropping attack, it also has  strong resistance to the joint attack of conventional image processing and local cropping. Even after multiple joint geometric attacks, it can still extract clear watermarks.

Key words: arnold scrambling, discrete cosine transform, singular value decomposition, cropping attack

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