Method and apparatus for automatically testing whether a subject matter of a film is covered

摘要

A method for automatically testing whether a subject matter (ps, ps - 2) comprises a section of the of a film (fo) is covered or not,whereina light sensor (5) is used and the method comprises the steps of that– a focused light beam (ls) is generated and, on the surface of the object (ps, ps - 2) is directed,– by the object (ps, ps - 2), the reflection (r - 1, r - 2) of the light beam (ls) on the light sensor (5) is guided,– the light sensor (5) as a function of output signals is generated and light impinging– the output signals are evaluated,the light beam (ls) in such a way to the article (ps, ps - 2) is directed thatan angle (α) greater than zero between the light beam (ls) and a vertical (se) on the surface of the object (ps, ps - 2) at the point (ap), in which the light beam (ls) the surface of the object (ps, ps - 2), occurs,characterized in thatthe evaluation..