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Title:
METHOD AND DEVICE FOR RETRIEVING MICROFILM
Document Type and Number:
Japanese Patent JP3850116
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To reduce the possibility of the erroneous detection of a frame by deciding the existence of the frame by regarding the part of a film as white when the number of white signals in respective groups is equal to or over a set value and regarding it as black when the number of white signals is below the set value and making the set value used at an entering time into the frame from a gap between the frames smaller than the set value used at the time of outgoing to the outside of the frame from the inside thereof.
SOLUTION: The part of the film is decided to be white or black by obtaining the number of white signals included in the groups of the prescribed number of binarized signals just before a sampling signal every sampling signal, that means, by obtaining the ratio (W/N) of the number of white signals (W) to the number of binarized signals (N) included in the groups. The set values S1 and S2 for deciding the part of the film to be white or black are changed at the time of entering into the frame from the outside thereof and at the outgoing time to the outside of the frame from the inside thereof. That means, the proportion (W/N) of the number of white signals (W) to the number of binarized signals (N) included in the groups is made small at the time of entering into the frame from the outside thereof and made large at the outgoing time to the outside of the frame from the inside thereof.


Inventors:
Hiroshi Tamura
Application Number:
JP27663397A
Publication Date:
November 29, 2006
Filing Date:
September 25, 1997
Export Citation:
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Assignee:
Fuji Photo Film Co., Ltd.
International Classes:
G03B1/00; G03B21/11; (IPC1-7): G03B21/11; G03B1/00
Domestic Patent References:
JP47040492B1
JP59143139A
JP59143138A
JP62047630A
JP1193831A
Attorney, Agent or Firm:
Fumio Yamada
Yousuke Yamada