A projector is an optical device that draws on an image area (screen) is usually magnified image of an object or image data by computer. Practical applications include the presentation of slides, pictures, graphics or data in presentations, demonstration of computer programs that substitute for a blackboard and film screenings. Projectors for connection to analogue and digital sources such as computer or video recorder and video projectors or video projector for short. Specific technical applications can be found in the projection optical 3D metrology, eg in the fringe projection or the light-section method.

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