Stfi

Per-Ake Johansson

Peter Hansson

Method of determining a surface illuminated by incident light. First the intensity (I (x,y)) of light reflected from the surface is recorded in a first image of the surface. After this, the intensity (I (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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Stockholm, Sweden

Per-Ake Johansson