Device for document filming
AssigneeVEB Pentacon Dresden
InventorsErich Hahn, Frank Reissig
Life of this patent
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Abstract
A document photographing device has a surface for supporting a document to be photographed, a camera positioned about the surface, to receive light reflected from and transmitted by a document supported on the surface, and separate means for illuminating the document from above and below respectively. An exposure meter receives light reflected from or transmitted through the document and indicates when correct exposure conditions have been set. The exposure meter includes correction means for correcting the reading of the exposure meter to take account of the different spectral radiation characteristics of the illuminating means.
Claims9
A device for photographing documents comprising:
- i. a surface for supporting a document to be photographed;
- ii. a camera positioned above said surface, to receive light reflected from and transmitted by a document when supported on said surface;
- iii. first illumination means for illuminating from above a document when supported on said surface;
- iv. second illuminating means for illuminating from below a document when supported on said surface, having spectral radiation characteristics different from said first illuminating means;
- v. means for selecting between illumination from above and from below;
- vi. an exposure measuring device for receiving light reflected from or transmitted through a document when supported on said surface, and for indicating when correct exposure conditions have been set;
- vii. correction means for correcting the reading of the exposure meter to take account of said different spectral radiation characteristics of the first and second illuminating means.
Dependencies are inferred from the claim text.