Film scanner and a scanning method for suppressing brightness variations of a radiation source
AssigneeDeutsches Zentrum für Luft- und Raumfahrt e.V.
InventorsMathias Uhlig, Andreas Eckardt, Michael Neidhardt
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Abstract
A film scanner for digitizing a film includes a stabilized radiation source producing light, a film stage on which the film to be digitized is guided, a projection lens, and a photosensitive sensor. Light passing through the film to be digitized is projected by the projection lens onto the photosensitive sensor when the film is on the film stage, and the film is converted to digital image data by the photosensitive sensor. The film scanner also includes a photosensitive reference sensor arranged for determining brightness measurement values and brightness variations of the radiation source.
Claims20
A film scanner for digitizing a film, comprising:
- a film stage on which the film to be digitized is guided;
- a stabilized radiation source producing light for illuminating the film to be digitized when the film is on said film stage;
- a projection lens;
- a photosensitive sensor, wherein light passing through the film to be digitized is projected by said projection lens onto said photosensitive sensor when the film is on said film stage, wherein the film is converted to digital image data by said photosensitive sensor;
- and
- a photosensitive reference sensor arranged for determining brightness measurement values and brightness variations of said radiation source.
A scanning method for suppressing brightness variations of a radiation source during digitizing of film by a film scanner, said method comprising the steps of:
- producing light using the radiation source;
- illuminating sections of the film conducted across a film stage using the produced light;
- projecting, by a projection lens, the light which passes through the film onto a photosensitive sensor;
- digitizing the projected illuminated sections of the film and thus producing digital image data;
- and
- measuring, by a reference sensor, brightness variations of the radiation source and determining, by the reference sensor, brightness measurement values of the radiation source.
Dependencies are inferred from the claim text.