Apparatus for obtaining three-dimensional volume data of an object
US5305092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1992 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Sep 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10028
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for obtaining three-dimensional volume data indicative of the shape of an object by processing the video signal resulting from picking up the object has an image projector for projecting a two-dimensional reference optical image containing a large amount of spatial high-frequency components on the surface of the object, a two-dimensional image pickup device for sequentially picking up the image of the object on which the two-dimensional optical image is projected, while the focal plane is being shifted, a range finder for extracting the high-frequency components of an image signal of a very small region including each of a plurality of detection points on the image picked up by said image pickup device, and detecting the best focal plane position where an in-focus condition is given, for each of the plurality of detection points from the change of the high-frequency components with the shift of the focal plane, and a memory for storing data of the best focal plane detected for each of the detection points as the three-dimensional volume data of the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.