This paper proposes a robust watermarking approach based on Discrete Cosine Transform domain that combines Quick Response Code and chaotic system.
Cite
@article{arxiv.1407.7337,
title = {A Digital Watermarking Approach Based on DCT Domain Combining QR Code and Chaotic Theory},
author = {Qingbo Kang and Ke Li and Jichun Yang},
journal= {arXiv preprint arXiv:1407.7337},
year = {2015}
}