Mocap Without Limits - How Xsens Solved the Drift Dilemma
25th June 2024, written by Remco Sikkema——In my 15 years with XSENS, I have witnessed the evolution of one of the most advanced motion capture systems ever built. Through this journey, we have faced and overcome numerous technical challenges. While no technology is without flaw, we strive to make our motion capture system as close to perfect as possible.
Our mocap systems feature sensors worn directly on the body – either embedded in a suit or attached using straps. Placed strategically on key points of the human body, these sensors measure movement without relying on external cameras. This offers unmatched freedom and flexibility to users, allowing them to simply put on the Xsens suit, and capture motion in any environment. However, there is one drawback to inertial motion capture known as ‘drift’, and for us to deliver our promise of effortless mocap, we had to take care of it.
What is drift?
Drift occurs when, after recording a
movement that ends at the same location as it began, the motion capture
software indicates a different starting point. Essentially, the virtual
representation of the movement doesn’t align perfectly with the movement
in the real world. Research has shown that drift is more prominent
during fast, dynamic movements such as running, and when the user is not
touching the ground, such as during jumps or fight scenes. On the other
hand, slow and deliberate movements result in less drift.
Why does it happen?
Due to a lack of external references
such as cameras, inertial mocap lack absolute positioning. They rely on
mathematical calculations to determine position. These calculations tend
to introduce minor errors and as the errors accumulate over time, there
is noticeable drift in positioning. Drift is inherent to inertial mocap
and eliminating it completely is a challenge. However, at Xsens, we
have made remarkable strides in bringing it down to a minimum.
How did we solve it?
Our advanced sensor fusion algorithms
are key to our success in minimizing drift. With decades of experience
and expertise embedded in our technology, we have leveraged machine
learning (ML) and artificial intelligence (AI) to optimize our
algorithms for the best possible result. We continuously refine these
algorithms, especially for scenarios most prone to drift, such as fast
movements or activities with low ground contact. This is significantly
enhanced the precision and reliability of our system.
Our achievement in minimizing drift is unmatched in the industry. No other inertial mocap product on the market can demonstrate such a result.
Xsens mocap
Xsens helps animators to create realistic movements for characters and by choosing Xsens, you’re not just investing in technology, but also in the future of your studio, your team, and your storytelling.
Application area: VFX & cinematic video production
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本文由莫子若转载自XSENS Official Website，原文标题为:Mocap Without Limits - How Xsens Solved the Drift Dilemma，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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世界领先的3D运动追踪技术及产品供应商：Xsens
Xsens成立于2000年，总部位于荷兰，mCube旗下子公司，是3D运动追踪技术和产品的主要创新者，是目前市场上基于MEMS技术表现最好、最可靠的IMU制造商，传感器支持IMU,VRU,AHRS, GNSS/INS(+RTK)四种集成等级，配合强大的“传感器融合”软件算法，可实现高精度，高稳定性的姿态、航向、位置信息监测，在AGV、自动驾驶、卫星天线、安防、航天航空等多个领域中广泛应用。
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