合焦点法による金属反射性微小物体の三次元全周計測

抄録

An imaging system was build using a telecentric optics in image space and a CCD image sensor that was movable along the optical axis in order to keep a perfect perspective projection during focusing. It was successfully applied to establish omni-directional measurement of a drill bit as an example of shiny metallic objects based on the shape-from-focus method. Negative data from glare regions were replaced with overlapping positive data obtained from neighboring viewpoints. Usage of a table that precisely rotates the object simplified registration of the multiple-view data. Finally, a fine mesh connecting surface points (corresponding pixels in images) can be generated to produce a three-dimensional graphic model with texture.