在基于标记器的运动捕捉网球服务的不确定性估计
Simon Ozan1, Loïc Fourel1, Pierre Touzard1
1Univ Rennes, Inria, M2S, 35000 Rennes, France.
Journal of biomechanics
|December 19, 2025
概括
标记物放置错误 (MPE) 和软组织工件 (STA) 显著影响动作捕捉 (MoCap) 分析人类运动. 这项研究量化了它们对网球服务运动学的影响,为提高准确性提供了关键的参考值.
科学领域:
- 生物力学 生物力学
- 人类运动分析 人类运动分析
- 运动科学 运动科学 运动科学
背景情况:
- 基于标记器的运动捕获 (MoCap) 对于分析人类运动至关重要.
- 莫卡普数据容易受到测量不确定性的影响,例如标记物放置错误 (MPE) 和软组织工件 (STA).
- 量化这些不确定性对于准确的生物力学分析至关重要.
研究的目的:
- 量化MPE和STA在网球服务期间对关节角度和角度速度的单独和组合影响.
- 为了解弹道运动中的测量不确定性提供参考值.
主要方法:
- 用蒙特卡洛模拟方法对3000个MPE和STA的扰乱标记轨迹进行了模拟.
- 使用随机偏移模拟了MPE,使用侧面扰动模拟了STA.
- 对所有自由度的关节动力学进行了比较,计算了置信区间,RMSD和MDC.
主要成果:
- 软组织工件 (STA) 主要影响了角速度.
- 标记器放置错误 (MPE) 对联合角度的影响更大.
- 组合模拟产生了最高的可变性,具有显著的置信区间和RMSD值,无论是关节角度和速度.
结论:
- 这项研究首次量化了MPE和STA对弹道运动动力学的影响.
- 这些发现为MoCap研究中的测量不确定性提供了关键参考值.
- 结果使得在人类运动分析中的科目和研究之间进行更准确的比较.
相关概念视频
04:08The Uncertainty Principle
31.2K
Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
31.2K
00:54Uncertainty: Confidence Intervals
10.1K
The confidence interval is the range of values around the mean that contains the true mean. It is expressed as a probability percentage. The interpretation of a 95% confidence interval, for instance, is that the statistician is 95% confident that the true mean falls within the interval. The upper and lower limits of this range are known as confidence limits. The confidence limits for the true mean are estimated from the sample's mean, the standard deviation, and the statistical factor...
10.1K
00:59Uncertainty: Overview
1.5K
In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
1.5K
01:24Relative Motion Analysis - Velocity
670
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
670
01:24Absolute Motion Analysis- General Plane Motion
507
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
507
03:37Uncertainty in Measurement: Accuracy and Precision
99.3K
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
99.3K