Abstract: A feature-based data structure of a digital manikin for describing the exterior features of a body comprises a plurality of feature points of the body, a plurality of girth lines, and a plurality of meridian lines. The girth lines pass through the feature points. Each of the meridian lines is formed by connecting the corresponding feature points respectively out of the girth lines. The girth lines of an arm of the body include an arm-hole girth, an elbow girth, and a palm base girth. The arm-hole girth passes through the shoulder end point, the front arm pit, and the rear arm pit. The elbow girth passes through the concave and convex points on the elbow girth. The palm base girth means the location where the size variation of the cross-sectional profile from the fore arm to the palm is the largest.

Abstract: A dual-mode 3D optical measurement apparatus is applied to scan at least one object or capture the motion of at least one object. The optical measurement apparatus includes a light-projection unit, a plurality of marker units, and an image-capturing unit. The light-projection unit projects light on the object. The marker units are disposed at the object. When the dual-mode 3D optical measurement apparatus executes a static scan mode, the light-projection unit projects light on the surface of the static object, and then the image-capturing unit captures a plurality of static images of the object. When the dual-mode 3D optical measurement apparatus executes a motion capture mode, the image-capturing unit captures a plurality of motion images of the marker units. In addition, a dual-mode 3D optical measurement system is also disclosed.