QR code watermarking algorithm based on wavelet transform. Panyavaraporn, J., Horkaew, P., & Wongtrairat, W. In 2013 13th international symposium on communications and information technologies (ISCIT), pages 791–796, 2013. IEEE.
bibtex   
@inproceedings{panyavaraporn2013qr,
  title={QR code watermarking algorithm based on wavelet transform},
  author={Panyavaraporn, Jantana and Horkaew, Paramate and Wongtrairat, Wannaree},
  booktitle={2013 13th international symposium on communications and information technologies (ISCIT)},
  pages={791--796},
  year={2013},
  organization={IEEE}
}

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