Picked 3 Global Motion Capture Services for 3D Sports Analysis!

2024.11.01 written by Gaku Morita(SPLYZA Inc.)

※日本語版の記事はこちら
https://www.sportsanalyticslab.com/lifehack/motion-capture.html


3D motion analysis has become an indispensable tool in the sports industry for enhancing performance and preventing injuries. By capturing and analyzing 3D data of human movement, athletes and coaches can gain valuable insights into various aspects of performance, from technique to muscle activation. This technology enables a more comprehensive understanding of movement patterns, allowing for targeted training and injury prevention strategies.

Beyond sports, the demand for 3D data has surged across various industries. The growth of 3D content in entertainment, including animation, gaming, and streaming, coupled with advancements in virtual reality (VR) technologies, has driven a significant increase in the utilization of 3D data. Given the widespread adoption of 3D data, numerous motion capture services have emerged worldwide. These services specialize in capturing human motion and converting it into 3D motion data, often in the BVH format. This article will delve into three such services, focusing on their suitability for motion analysis.

*In this article, the following tools were used for accuracy verification:
Blender: 3D computer graphics software
AnyBody: Musculoskeletal modeling simulation software

©AnyBody Technology A/S


Plask


Supported formats and devices: Video files(Monocular Camera) / PC only

Plask is a web-based service accessible via a PC browser. By uploading an MP4 video to Plask, you can generate 3D motion data of the person depicted in the video. Furthermore, you can review animations within Plask where the motion data is linked with a character model, and even edit these animations. Additionally, the motion data can be exported in BVH format

Accuracy:

In the pitching motion, the movement appears natural and consistent with actual movements when viewed from the front. However, from a side view, the overall motion is jerky and the foot placement seems unstable.

In the lifting motion, while the overall movement is natural, there is an unnatural sliding motion of the left foot around the right foot as an axis.

**Muscle activity contours according to AnyBody (Blue: LowRed: High)

-Detailed Analysis Using AnyBody with Plask by Terrabyte Co., Ltd
Japanese: https://www.terrabyte.co.jp/AnyBody/exe-Any/?p=733
English: https://plask.ai/ja/blog/62

Pricing:

Plask is free to use with a freemium pricing model, offering monthly and yearly subscription plans based on usage and processing needs.

**

This web-based service allows users to easily perform motion capture on their own recorded videos using a PC browser. It offers a free tier, making it accessible to a wide range of users. While the accuracy is generally good when viewed from the front, there are shortcomings in side views, such as the feet appearing to slide. Given the relatively high accuracy of the front view, this service is well-suited for applications that involve mapping a character model onto a fixed camera perspective. It is particularly effective for analyzing movements from a frontal viewpoint.

◾︎Plask
https://plask.ai/





SPLYZA Motion - AI-based Markerless 3D Motion Capture Analysis app.


Supported formats and devices: Video files(Monocular Camera) / Smartphones and tablets (iOS only)

SPLYZA Motion is a service that can be used by downloading the app onto an iPhone or iPad and registering an account. By selecting the 3D option within the app and processing a video, 3D motion data of the person can be generated. You can view the 3D movement within SPLYZA Motion and display information such as the speed, distance, and angle of specific body parts. Additionally, the generated 3D motion data can be exported in BVH format.

Accuracy:

The pitching motion appears natural overall. The side view demonstrates a high degree of smoothness, and the foot placement is stable, indicating good accuracy.

The lifting motion also appears natural overall, with no noticeable inconsistencies in foot placement.

**Muscle activity contours according to AnyBody (Blue: LowRed: High)


Pricing:

SPLYZA Motion offers a one-month free trial, after which a paid subscription is required to continue usage.

**

Like Plask, this service allows for easy motion capture from recorded videos using smartphones or tablets, making it suitable for outdoor use. As a result, it is particularly useful for analyzing sports movements. It offers stable accuracy from both frontal and side views, making it ideal for various applications such as analyzing a single action from multiple perspectives. (*Detailed accuracy data is currently under joint research with several universities.)

◾︎SPLYZA Motion
https://motion.products.splyza.com/en/





VICON - MOTION CAPTURE FOR BIOMECHANICS


Supported formats and devices: Cameras / Markers / PC only

VICON requires a space equipped with dedicated cameras and a PC with specialized software. By attaching markers to a subject and processing the marker positions through cameras using the software, motion data can be captured and visualized in real-time. Data can be captured from subjects other than humans as long as markers are attached, and the motion data can be exported in BVH format.

Accuracy:

With an average error less than 1mm, the accuracy is much higher, virtually mirroring real-world movements.


*References
https://www.vicon.com/support/faqs/category/accuracy/

The lifting motion is exceptionally natural and free from any noticeable inconsistencies.

**Muscle activity contours according to AnyBody (Blue: LowRed: High)


Pricing:

While VICON has a variety of plans and pricing options on offer, the initial setup of the system including markers and cameras, typically incurs a one-time cost.

**

With exceptional accuracy and real-time motion capture capabilities, this service can be applied to a wide range of fields beyond sports performance analysis. While it may require a larger initial investment in equipment compared to other options, its precision makes it an indispensable tool for professional environments where highly accurate data is paramount.

◾︎VICON
https://www.vicon.com/applications/life-sciences/biomechanics/





Summary

Name Accuracy Ease of use Price
Plask
SPLYZA Motion
VICON

In this article, we've introduced three motion capture services with a focus on sports performance analysis. By utilizing these services, you can gain new insights and discover more efficient training methods, leading to improved athlete performance and injury prevention.

The best service for you will depend on your specific analysis goals, budget, and required accuracy. For high-precision data, VICON is recommended, while Plask and SPLYZA Motion are great options for those looking for a more accessible solution.

Motion capture technology is not limited to sports; it's also used in entertainment, healthcare, and many other fields. With advancements in VR technology and AI automation, we can expect even more exciting developments in the future.

We hope this article helps you find the right motion capture service for your needs and explore the new possibilities of sports science.