Method and device for optical form measurement and/or estimation
AssigneeOBE Ohnmacht & Baumgartner GmbH & Co. KG
InventorsChristoph Wagner, Reiner Wagner
Life of this patent
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Abstract
A method for optical shape recording and/or evaluation of optically smooth, glossy or optically rough surfaces wherein a photometric stereo method and a deflectometric method are combined using a scattering body so that the positions on the scattering body surface are two-dimensionally encoded.
Claims18
A method for at least one of optical shape recording and evaluation of an optically smooth surface, an optically glossy surface or an optically rough surface, the method combining a photometric stereo method and a deflectometric method, the method comprising:
- two-dimensionally encoding positions on a surface of a scattering body with reference to a shape of the scattering body, such that one vector normal to each position on the surface of the scattering body is uniquely allocated to each position on the scattering body surface;
- uniquely allocating to each normal vector a luminance back-scattered by the scattering body;
- and
- allocating the back-scattered luminance to illumination strengths of recorded images.
A device for optical shape measurement for at least one of optical shape recording and evaluation of an optically smooth surface, an optically glossy surface or an optically rough surface by combining a photometric stereo method and a deflectometric method, the device comprising:
- a scattering body comprising a scattering body surface;
- at least one optical recorder for receiving illumination reflected off the surface;
- at least one light source positioned to scatter illumination to the scattering body surface;
- a processor-readable medium incorporating two-dimensionally encoded positions on the scattering body surface with reference to a shape of the scattering body, such that one vector normal to each position on the scattering body surface is uniquely allocated to each position on the scattering body surface;
- and
- a processor operable to uniquely allocate to each normal vector a luminance back-scattered by the scattering body and to allocate the back-scattered luminance to illumination strengths of recorded images.
Dependencies are inferred from the claim text.