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# A Standardized Framework for Sensor Placement in Human Motion Capture
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<h1>A Standardized Framework for Sensor Placement in Human Motion Capture</h1>
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::: {.callout-note}
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This website presents a unified framework for sensor placement in human motion capture and wearable applications. For the complete research paper, please visit our preprint on [ArXiv](https://doi.org/10.48550/arXiv.2412.21159).
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This website presents a unified framework for sensor placement in human motion capture and wearable applications. For the complete research paper, please visit our preprint on [arXiv](https://doi.org/10.48550/arXiv.2412.21159).
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:::
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## Introduction
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The proliferation of wearable sensors and monitoring technologies has created an urgent need for standardized sensor placement protocols. While existing standards like SENIAM address specific applications, there is no comprehensive framework that spans different sensing modalities and applications. We present a unified sensor placement standard that ensures reproducibility and transferability of human movement data across different recording systems and research domains.
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## Fundamentals
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### Reference Frames and Coordinate Systems
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A **reference frame** consists of an origin point and a set of axes that define directions in space. In human movement analysis, we encounter multiple reference frames:
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1.**Global laboratory frame**: The fixed reference frame of the measurement space
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2.**Anatomical frames**: Tied to specific body segments
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3.**Sensor-specific frames**: Related to individual sensor positioning
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A **coordinate system** is fully described by:
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1. The origin relative to which coordinates are expressed
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2. The interpretation of the three axes
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3. The units in which measurements are expressed
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At the heart of this framework, **the anatomical landmark table** provides a comprehensive list of palpable landmarks and their precise locations on the human body. These landmarks serve as reliable reference points for consistent sensor positioning across different applications and operators.
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@@ -65,6 +72,22 @@ A **coordinate system** is fully described by:
A **reference frame** consists of an origin point and a set of axes that define directions in space. In human movement analysis, we encounter multiple reference frames:
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1.**Global laboratory frame**: The fixed reference frame of the measurement space
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2.**Anatomical frames**: Tied to specific body segments
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3.**Sensor-specific frames**: Related to individual sensor positioning
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A **coordinate system** is fully described by:
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1. The origin relative to which coordinates are expressed
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2. The interpretation of the three axes
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3. The units in which measurements are expressed
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### Hierarchical Structure
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@@ -140,4 +163,4 @@ There are specific areas where we seek contributions:
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- Standard vocabulary and communication formats through BIDS, HED, and other specifications
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- Validation studies for inter-operator reliability assessment
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- Mappings between this framework and existing standards (such as SENIAM)
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- Software tools for coordinate calculation and placement visualization
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- Software tools for coordinate calculation and placement visualization
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