A marker-free method for tracking human lower limb segments based on model matching

摘要: Abstract A 2D marker-free method for tracking the human lower limb segments has been developed and tested. The is based on model matching using distance transformations, intended use in analysis of gait. used consists five line segments, which are matched to contours segments. Experiments have made two different kinds objects; a rigid leg leg. Only movement sagittal plane considered. An image sequence moving object was captured, each image. results were then compared data obtained markers mounted at ankle joint, knee joint hip joint. experiments body done assess accuracy under perfect conditions. average difference between estimated positions reference found be less than 2 mm all three joints, with standard deviation 1 mm. To test more realistic situation, it applied during stance phase walking. Measurements healthy male subjects. differences marker 6 10 22 mm, respectively. corresponding deviations 4 7 9 satisfying results, though controlled laboratory conditions, show that this might useful gait analysis.