本文主要建立一套光電式三維人體運動追蹤系統，研究內容包括多組三維運動追蹤器的主從式架構與CCU(Central Control Unit)模組電路板的改善。為了要達到運動追蹤器同步取像，與較無遮蔽效應下全身人體運動擷取之目的，本文提出以多組三維運動追蹤器放置於人體四周，並使用Hub上的CPLD透過差動傳輸方式提供工作時脈給各組之Motion tracker。完成各組三維定位器(Slaves)同步取點的動作後，再由Slaves將所擷取之資料透過Hub上的USB傳輸到主控PC上。在多組運動追蹤器的連線方式上，本文提出以非同步串列傳輸的方法來傳送由人體運動追蹤器給Hub的資料。為了更進一步減少標誌點遮蔽的問題，本文對所有標誌點的運動建立運動曲線，並且將每一個標誌點內插出在同一個時間下的位置。最後再以運動學與幾何的觀念，由已經得到的標誌點座標，來求出遮蔽標誌點的位置。

The purpose of the study focuses on the Client-Server Framework for an optoelectronic human motion tracking system. In the previous study, we have developed a 3D locator. We then propose to connect several (at least 4) 3D locators which are placed around the human body to capture the whole body motion without obstruction. A hub (server) is placed between the PC and these 3D locators (clients). The hub provides clock signals to the clients so that these locators can exposure their CCD simultaneously. For data transmission, we use the method of UART (Universal Asynchronous Receiver/Transmitter) to transfer the data from the motion trackers to the Hub. To further decrease the problem of the occultation of the markers, we construct the motion curves of all the markers and calculate the position of all the markers at the same time slice. Then, we use kinematic and geometry relationship between the markers to get the position of the occultation of the markers if any missing.

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