公开(公告)号：EP1155284A1

公开(公告)日：2001-11-21

申请号：EP00903057.8

申请日：2000-01-10

申请人： STFI

发明人： JOHANSSON, Per-Ake ,  HANSSON, Peter

IPC分类号： G01B11/24 ,  G01B11/30

CPC分类号： G01B11/306

摘要： Method of determining a surface illuminated by incident light. First the intensity (I1(x,y)) of light reflected from the surface is recorded in a first image of the surface. After this, the intensity (I2(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 emphasises 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.