Method of determining an illuminated surface

G - Physics – 01 – B

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G01B 11/24 (2006.01) G01B 11/30 (2006.01)

Patent

CA 2359263

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.

Procédé de détermination topographique d'une surface illuminée par une lumière incidente. D'abord, l'intensité (I¿1?(x,y)) de la lumière réfléchie par la surface est enregistrée dans une première image de ladite surface. Ensuite, l'intensité (I¿2?(x,y)) de la lumière réfléchie par la surface est enregistrée dans une seconde image de ladite surface, prise à un angle d'éclairage différent. Seule la lumière réfléchie de manière diffuse est enregistrée. La différence entre les intensités enregistrées sur les première et seconde images est déterminée pour obtenir une représentation qui souligne les variations de gradient de la surface. Cette représentation est en outre traitée par intégration adaptée aux signaux pour obtenir une description topographique, c'est-à-dire une fonction de hauteur de la surface.

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