1. Ministry of Health, Labour and Welfare, ‘‘The survey of difficulties of daily life (survey of nationwide home children with disabilities, and others, 2011),’’ (in Japanese), Dept. Health Welfare Persons Disabilities, Tokyo, Japan, Tech. Rep., 2013.
2. S. Tanaka, M. Takuma, Y. Tsukada, Recognition of finger alphabet remote image sensor, (in Japanese), in Proc. 76th Nat. Conv. (IPSJ), 2014, vol. 76. no. 2, pp. 2275–2276.
3. T. Miyake, D. Wakatuki, I. Naito, ‘‘A basic study on recognizing fingerspelling with hand movements by the use of depth image,’’ (in Japanese), Nat. Univ. Corporation Tsukuba, Univ. Technology, Tsukuba, Japan, Tech. Rep., Dec. 2012, vol. 20, no. 1, pp. 7–13.
4. Training system for learning finger alphabets with feedback functions (in Japanese), IEICE (HIP);Takabayashi;Tech. Rep.,2013
5. M. Maehatake, M. Nishida, Y. Horiuchi, A. Ichikawa, A study on sign language recognition based on gesture components of position and movement, (in Japanese), in Proc. Workshop Interact. Syst. Softw. (WISS), Japan, Dec. 2007, pp. 129–130.