good day everyone! I am an ECE student who's currently taking my thesis 1.. We found a journal titled "Imitation Control for Biped Robot Using Wearable Motion Sensor" in which they use commercial optical motion analysis system Hi-DCam (NAC image technology. Japan) to validate the wearable motion analysis system’ performance and compare the results from the wearable system with the measurements. What I would like to ask is if anyone of you knows an alternative for this optical analysis motion system that has the same function with the Hi-DCam that has lower cost. or if anyone of you knows a software that do the same function with the Hi-DCam.. thank you and God Bless us all..