US4829371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film reading apparatus which reads an unexposed portion of a film to determine its type
Assignee: Canon Inc
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Filing: 1986-03-20
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Granted: 1989-05-09
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Expires: 2006-03-20
Abstract
Abstract A color scanner for converting color data of a color original (e.g., a photographic film) into an electrical signal, includes a level comparator for discriminating the type of film (e.g., color negative vs. color positive, color vs. monochrome, type of color negative) in accordance with output signals, e.g., color component signals, from a sensor (i.e., based on a light transmittance of an unexposed portion of the film). The output from the level comparator is supplied to an accumulation time control block through a register, a selector, and the like. The accumulation time control block corrects the electrical signal based on the discrimination result from the level comparator irrespective of the type of film, so that an accumulation time of the sensor is changed by changing a bias voltage applied thereto.
Inventors
- 👤 Akira Hiramatsu
- 👤 Takashi Kawabata
- 👤 Hitoshi Mukohjima
- 👤 Koichi Washisu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:31
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40062; H04N1/00795; H04N1/00798; H04N1/00801; H04N1/00806; H04N1/46; H04N1/56; H04N1/60; H04N1/6094
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A film reading apparatus comprising: extracting means for color-separating film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the discrimination result obtained by said discriminating means; wherein said discriminating means discriminates whether the film document is a color negative film or a color positive film.
Claim 2
Dependent Claim
101 words
A film reading apparatus comprising: extracting means for color-separating film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the discrimination result obtained by said discriminating means; wherein said discriminating means discriminates whether the film document is a color negative film or a color positive film.
Claim 3
Dependent Claim
100 words
A film reading apparatus comprising: extracting means for color-separating a film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the discrimination result obtained by said discriminating means; wherein said discriminating means discriminates whether the film document is a color film or a monochrome film.
Claim 4
Dependent Claim
100 words
A film reading apparatus comprising: extracting means for color-separating a film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the discrimination result obtained by said discriminating means; wherein said discriminating means discriminates whether the film document is a color film or a monochrome film.
Claim 5
Dependent Claim
117 words
A film reading apparatus comprising: extracting means for color-separating a film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the dicrimination result obtained by said discriminating means; wherein said control means inverts the level of the color component signal relating to the exposed portion of the film document when said discriminating means discriminates that the film document is a negative film.
Claim 6
Dependent Claim
117 words
A film reading apparatus comprising: extracting means for color-separating a film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the dicrimination result obtained by said discriminating means; wherein said control means inverts the level of the color component signal relating to the exposed portion of the film document when said discriminating means discriminates that the film document is a negative film.
Claim 7
Dependent Claim
119 words
A film reading apparatus comprising: extracting means for color-separating a film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the discrimination result obtained by said discriminating means; wherein said control means removes a bias signal, which depends upon the type of (the) film document discriminated by said discriminating means, form the color component signal relating to the exposed portion of the film document.
Claim 8
Dependent Claim
119 words
A film reading apparatus comprising: extracting means for color-separating a film document to extract a plurality of color component signals; discriminating means for discriminating the type of the film document by using a color component signal relating to an unexposed portion of the film document output by said extracting means; and control means for controlling the signal level of a color component signal relating to an exposed portion of the film document in accordance with the discrimination result obtained by said discriminating means; wherein said control means removes a bias signal, which depends upon the type of (the) film document discriminated by said discriminating means, form the color component signal relating to the exposed portion of the film document.
Claim 9
Dependent Claim
36 words
An apparatus according to claim 1, 2, 3 or 4, wherein said discriminating means discriminates the type of the film document in accordance with the signal level of each of said plurality of color component signals.
Claim 10
Dependent Claim
45 words
An apparatus according to claim 1, 2, 3 or 4, wherein said control means controls a gain for the color component signal relating to the exposed portion of the film document in accordance with the type of (the) film document discriminated by said discriminating means.
Claim 11
Dependent Claim
43 words
An apparatus according to claim 1, 2 ,3 or 4, further comprising means for detecting whether or not a color component signal output by said extracting means is a color component signal relating to the unexposed portion of the film document (or not).
Claim 12
Dependent Claim
25 words
An apparatus according to claim 1, 2, 3 or 4, wherein the plurality of color component signals are R, G and B color component signals.
Claim 13
Dependent Claim
29 words
An apparatus according to claim 2 or 4, wherein, when the film document is a color negative film, said discriminating means discriminates the type of the color negative film.
References Cited (Backward Citations)
US4079388A
Cited
US4097892A
Cited
DE2803866A1
Cited
US4274732A
Cited
GB2032633A
Cited
US4448521A
Cited
SU1068876A1
Cited
US4577961A
Cited
US4692794A
Cited
US4659213A
Cited
US4707120A
Cited
JPH05230429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |