I do not know if you have already studied the papers referred below. They are useful bits and pieces in this topic. Kind regards,
Prof. Dr. Imre Horvath
Salter, T., Dautenhahn, K., & Boekhorst, R. T. (2006). Learning about natural human–robot interaction styles. Robotics and Autonomous Systems, 54(2), 127-134.
Munoz-Salinas, R., Aguirre, E., García-Silvente, M., & González, A. (2005). A fuzzy system for visual detection of interest in human-robot interaction. In 2nd International Conference on Machine Intelligence (ACIDCA-ICMI’2005) (pp. 574-581).
Guo, C., & Sharlin, E. (2008, April). Exploring the use of tangible user interfaces for human-robot interaction: a comparative study. In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (pp. 121-130). ACM.
Robins, B., Amirabdollahian, F., Ji, Z., & Dautenhahn, K. (2010, September). Tactile interaction with a humanoid robot for children with autism: A case study analysis involving user requirements and results of an initial implementation. In RO-MAN, 2010 IEEE (pp. 704-711). IEEE.
Kuczogi, G., Horváth, I., Rusák, Z., Vergeest, J. S. M., & Jansson, J. (2000, May). Strategy and process of interpretation of verbal communication related to shape conceptualization. In International Desgin Conference-Design.
Lang, S., Kleinehagenbrock, M., Hohenner, S., Fritsch, J., Fink, G. A., & Sagerer, G. (2003, November). Providing the basis for human-robot-interaction: A multi-modal attention system for a mobile robot. In Proceedings of the 5th international conference on Multimodal interfaces (pp. 28-35). ACM.
Sato, E., Yamaguchi, T., & Harashima, F. (2007). Natural interface using pointing behavior for human–robot gestural interaction. Industrial Electronics, IEEE Transactions on, 54(2), 1105-1112.
Varga, E., Horváth, I., Rusák, Z., De Smit, B., & Broek, H. (2004). Survey and investigation of hand motion processing technologies for compliance with shape conceptualization. In Proceedings of DETC (Vol. 4, pp. 1-14).
Lee, W., Ryu, H., Yang, G., Kim, H., Park, Y., & Bang, S. (2007). Design guidelines for map-based human–robot interfaces: A colocated workspace perspective. International journal of industrial ergonomics, 37(7), 589-604.
Moeslund, T. B., Störring, M., & Granum, E. (2002). A natural interface to a virtual environment through computer vision-estimated pointing gestures. In Gesture and Sign Language in Human-Computer Interaction (pp. 59-63). Springer Berlin Heidelberg.
Skubic, M. (2005). Qualitative spatial referencing for natural human-robot interfaces. interactions, 12(2), 27-30.
There is work out of the University of Calgary in the proximal interaction area. They were doing proximal interaction with robots as greeters in companies and such. Was presented in a keynote in INTERACT 2011 with Saul Greenberg.