Verfahren und Vorrichtung zur automatischen Pruefung bewegter Oberflaechen

EP 898163 A UPAB: 19990324 NOVELTY - Illumination and observation channels are formed by light sensitive sensor devices and by light sources. A bright field condition is formed under which light emitted, e.g. by light source L1, is reflected from a specular surface (S) back towards the lens (304) of camera (C). The angle beta and gamma can be chosen in accordance with the demands of the application for optimized sensitivity and robustness of the measurements. USE - Method and apparatus are used for gathering 3D-information, of each surface element of automatic inspection of moving surfaces, such as steel strips, wood, leather or tiles, more particularly for automatic inspection of moving surfaces utilising at least three different illumination or observation channels, to detect and classify anomalies in surfaces with respect to reflectivity, colour, glossiness, texture or 3D-profile of surface under inspection. ADVANTAGE - Present invention provides enhanced method and apparatus for automatic inspection of surfaces, which enables inspection of surfaces with enhanced reliability at less false alarm rates