Instruction display of motion for taijiquan in intelligent space

We propose an instruction display and a skill level index to evaluate the degree of progress. The instruction display shows a exemplary trajectory. Learners learn the trajectory to be traced through by their joints. The trajectory is generated from a time series data of 3-dimensional coordinates of joints in the human body acquired from the expert motion. The instruction display enables learners to understand the difference between learners' motion and expert's one. The skill level index show numerically the difference between learners' motion and expert's one. To realize evaluation which does not depend on motion speed, we use continuous dynamic programming (DP) matching. The values obtained from continuous DP matching show learner's skill level. To verify the effect of the instruction display and the skill level index, we experiment with learners who learn left arm motion with the instruction display and report its result.