Method of determining an illuminated surface
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United States of America Patent
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Jun 29, 2004
Grant Date -
N/A
app pub date -
Jan 8, 2002
filing date -
Jan 28, 1999
priority date (Note) -
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Abstract
Method of determining a surface illuminated by incident light. First the intensity (I.sub.1 (x,y)) of light reflected from the surface is recorded in a first image of the surface. After this, the intensity (I.sub.2 (x,y)) of light reflected from the surface is recorded in a second image of the surface, taken at a different angle of illumination. Only the diffusely reflected light is recorded. The difference between the recorded intensities of the first and the second images is determined to obtain a representation that emphasizes variations in gradient of the surface. This representation is further processed by signal-adapted integration to a topographic description, that is, a height function of the surface.
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