Optics: measuring and testing – Shape or surface configuration
Reexamination Certificate
2007-06-05
2007-06-05
Nguyen, Sang H. (Department: 2877)
Optics: measuring and testing
Shape or surface configuration
C356S623000, C250S208100, C362S033000
Reexamination Certificate
active
10477344
ABSTRACT:
A method and apparatus for optically examining an object in a contactless manner, in which light successively impinges upon the surface of an object being examined. The different sources of light strike the object surface at different angles of incidence and reflect off the surface and are then able to be measured by an image sensor which produces a plurality of image data sets having different contents. In this way, a first image data set is produced with the incident light from which form-independent or non-topographical characteristics, such as color errors, can be derived. Form-dependent or topographical characteristics, such as scratches, are derived from a second image data set formed with glancing light or oblique light. Before the form characteristics are derived from the first image data set, it is essential that the distorting influences of form-independent characteristics are eliminated from the first image data set via the second image data set. Furthermore, the apparatus is embodied as a portable manual apparatus, which is placed by hand, in an approximately light-permeable manner, on the surface of the fixed object, or is displaced in contact with the surface.
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Nguyen Sang H.
Schindler Edwin D.
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