本文以螺旋運動方式計算人體各關節之相對位置運動螺旋軸，並提出以不同方式尋找其運動範圍之等效螺旋(Equivalent Joint Screw, EJS)，以代表該關節軸並加以比較。本文使用實驗室自行開發的雙模式三維光學量測系統，首先掃描受測者的身型，建立結構化之人體模型，再利用其運動追蹤功能，擷取受測者之標誌框運動，並使用相關連部位之相對運動，進行人體全身關節軸之搜尋。本文建立一個具有運動軸之人體模型，該人體模型共有48個運動自由度。由於硬體規格限制，我們簡化了手掌以及腳掌，使其為單一自由度的模型。為將找尋到之人體運動軸應用於不同模型，本文並提出一無因次化流程，將人體運動軸註冊至結構化之人體模型。

This study proposes a method to find the joint screw axes of relative motion on human body in screw motion concept, and compares different methods to find an equivalent joint screw (EJS) that represent the axes of the joints in its full range of motion. For finding the joint axes of human body, we use the dual-mode 3D optical measurement system which developed by our lab. First, a user should be scanned to obtain the human geometric model and the system will construct the body structure of this model. Then, track the markers of human motion by using the motion tracking function of this system. Use the relative motion to find the joint axes. We proposed a human kinematic model with 48 joint axes. This model has simplified palms and feet. Each has only one degree of freedom on it. For the purpose of applying the EJS to another human model, this study proposes a non-dimensional process to register the EJS in different human models.

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