What makes the stego image undetectable?

Songtao Wu, Yan Liu, Sheng-hua Zhong, Yang Liu 0004. What makes the stego image undetectable?. In Ramesh Jain, Shuqiang Jiang, John Smith, Jitao Sang, Guohui Li, editors, Proceedings of the 7th International Conference on Internet Multimedia Computing and Service, ICIMCS 2015, Zhangjiajie, Hunan, China, August 19-21, 2015. pages 47, ACM, 2015. [doi]

@inproceedings{WuLZ015,
  title = {What makes the stego image undetectable?},
  author = {Songtao Wu and Yan Liu and Sheng-hua Zhong and Yang Liu 0004},
  year = {2015},
  doi = {10.1145/2808492.2808539},
  url = {http://doi.acm.org/10.1145/2808492.2808539},
  researchr = {https://researchr.org/publication/WuLZ015},
  cites = {0},
  citedby = {0},
  pages = {47},
  booktitle = {Proceedings of the 7th International Conference on Internet Multimedia Computing and Service, ICIMCS 2015, Zhangjiajie, Hunan, China, August 19-21, 2015},
  editor = {Ramesh Jain and Shuqiang Jiang and John Smith and Jitao Sang and Guohui Li},
  publisher = {ACM},
  isbn = {978-1-4503-3528-7},
}