| 摘要 |
Three dimensional configurations of a portion of an object ( 12 ), such as a patient's tooth, are determined using intensity patterns produced by a projection unit ( 20 ) and detected by a sensor unit ( 22 ). In some embodiments, the intensity patterns are produced using a set of slides ( 16 A, 16 B, 16 C), e.g., a set of photographic slides, while in others they are produced using a transmissive liquid crystal device ( 60 ) or a single slide ( 16 ) which is moved by a piezoelectric translator ( 64 ). Methods and apparatus for reducing the effects of ambient light are also disclosed.
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