Lionnie, R., Timotius, I.K. and Setyawan, I. 2013. Performance Comparison of Several Pre-Processing Methods in a Hand Gesture Recognition System based on Nearest Neighbor for Different Background Conditions. Journal of ICT Research and Applications. 6, 3 (Sep. 2013), 183-194. DOI:https://doi.org/10.5614/itbj.ict.2012.6.3.1.