Optics: image projectors – Selective data retrieval – Film strip
Patent
1998-09-25
1999-12-21
Dowling, William C.
Optics: image projectors
Selective data retrieval
Film strip
353 25, G03B 2114
Patent
active
060039949
ABSTRACT:
There is disclosed a microfilm search method and device in which the presence of frames is accurately determined from a density change in a running direction of a microfilm. The detected density change is binarized into white and black synchronously with a sampling signal outputted for each predetermined feeding amount of the microfilm. The number of white signals included in a group of a predetermined number of binarized signals consecutive immediately before each sampling signal is successively obtained in response to the sampling signal. For the negative film, the presense of frames is determined by judging white (out-frame) when the number of white signals equals/exceeds a set value and by judging black (in-frame) when the number of white signals is less than the set value. The set value for determining the inside or outside of the frame may be changed when going into the frame from the outside of the frame and vice versa. Thereby, detection precision can further be raised.
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patent: 5590941 (1997-01-01), Hindeshima
Dowling William C.
Fuji Photo Film Co. , Ltd.
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