Table 2 Accuracy of the three-Kinect sensor based recognition of analysed human poses
From: Multiple Kinect based system to monitor and analyze key performance indicators of physical training
Pose picture | Pose title/average error | Best recognized segment and its error | Worst recognized segment and its error | Human skeleton visibility |
|---|---|---|---|---|
| Standing facing camera 10% | Right ankle–right hand (0.4%) | Left wrist–left hand (36%) | 100% Left arm recognized incorrectly. Right leg is not fully tracked |
| Standing sideways to the camera 12% | Spine mid–right shoulder (0.1%) | Mid hip–left hip (54%) | 72% Hands are disproportionate. Right shoulder recognized incorrectly |
| Squatting while holding legs 15% | Right ankle–right foot (1.5%) | Right ankle–right hand (44%) | 68% Legs recognized incorrectly. Fingers are disproportionate |
| Reaching toes standing 35% | Right hip–right knee (10.4%) | Spine mid–left shoulder (102%) | 76% Hands are in wrong position. Head and spine recognized incorrectly |
| Lying face down 17% | Right hip–right knee (1.4%) | Left wrist–left hand (70%) | 68% Proportions of body parts are correct, but positioning is not correct |
| Standing upside down 24% | Left hip–left knee (1.0%) | Neck–spine mid (71%) | Recognized as standing normally instead of upside down |
| Standing on one leg. Bending forward and holding another leg 21% | Neck–spine mid (0.4%) | Left wrist–left hand (133%) | 88% Hands are disproportionate |
| Laying legs up 31% | Right knee–right ankle (0.7%) | Spine mid–right shoulder (106%) | 64% Skeleton is completely warped: hands instead of feet. Other body parts are also in wrong places |
| Stretching 32% | Spine mid–right shoulder (1.4%) | Right ankle–right hand (62%) | 88% Body is not fully tracked–legs are tracked only above knees. Shoulder line is too high |
| Low start pose 25% | Neck–spine mid (2.9%) | Right ankle–right hand (63%) | 80% Legs are incorrect. Spine and neck are not accurately recognized |
| Sitting. legs straight 18% | Spine mid–right shoulder (1.4%) | Left wrist–left hand (53%) | 96% Body part lower than shoulders are tracked incorrectly (points are in incorrect positions) |
| Bending sideways 20% | Right hip–right knee (0.1%) | Spine mid–left shoulder (113%) | 96% Most of the points are misaligned with actual pose |
| Bend stretching while laying 21% | Spine mid–left shoulder (1.1%) | Left knee–left ankle (51%) | 80% Both legs and arms are tracked on arms |
