テニスサーブのマーカーベースモーションキャプチャにおける不確実性推定
Simon Ozan1, Loïc Fourel1, Pierre Touzard1
1Univ Rennes, Inria, M2S, 35000 Rennes, France.
Journal of biomechanics
|December 19, 2025
まとめ
マーカー配置誤差(MPE)と軟部組織人工物(STA)は、人間の動きのモーションキャプチャ(MoCap)分析に大きな影響を与えます。この研究は、テニスサーブの運動学に対するそれらの影響を定量化し、精度向上のための重要な参照値を提供します。
科学分野:
- 生体力学
- 人間運動解析
- スポーツ科学
背景:
- マーカーベースのモーションキャプチャ(MoCap)は、人間の動きの分析に不可欠です。
- MoCapデータは、マーカー配置誤差(MPE)や軟部組織人工物(STA)などの測定誤差の影響を受けやすいです。
- これらの不確実性を定量化することは、正確な生体力学的分析のために不可欠です。
研究 の 目的:
- テニスサーブ中の関節角度と角速度に対するMPEとSTAの個々のおよび組み合わせた影響を定量化すること。
- 弾道運動における測定誤差を理解するための参照値を提供すること。
主な方法:
- MPEとSTAのために3000の摂動マーカートラジェクトリを使用したモンテカルロシミュレーションアプローチが使用されました。
- MPEはランダムオフセットを使用してシミュレートされ、STAは正弦波摂動を使用してシミュレートされました。
- 関節運動学はすべての自由度で比較され、信頼区間、RMSD、およびMDCが計算されました。
主要な成果:
- 軟部組織人工物(STA)は主に角速度に影響を与えました。
- マーカー配置誤差(MPE)は、関節角度により大きな影響を与えました。
- 組み合わせたシミュレーションは、関節角度と速度の両方で有意な信頼区間とRMSD値を示し、最大のばらつきをもたらしました。
結論:
- この研究は、弾道運動の運動学に対するMPEとSTAの影響を初めて定量化したものです。
- この結果は、MoCap研究における測定誤差を考慮するための重要な参照値を提供します。
- 結果は、人間運動解析における被験者間および研究間のより正確な比較を可能にします。
関連する概念動画
The 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
Uncertainty: 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
Uncertainty: 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
Relative 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
Absolute 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
Uncertainty 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


