US4933983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image data reading apparatus
Assignee: Canon Inc
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Filing: 1987-02-11
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Granted: 1990-06-12
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Expires: 2007-02-11
Abstract
Abstract An image data reading apparatus includes a photoelectric conversion device for converting image data on an original into electric signals, a light source for illuminating the original, a detector for detecting the shading correction values for the light source and the photoelectric conversion device, and an image processor for effecting shading correction on the video data output from the photoelectric conversion device with the shading correction value detected by the correction value detector.
Inventors
- 👤 Akira Hiramatsu
- 👤 Yuichi Sato
- 👤 Tokuichi Tsunekawa
- 👤 Shigeki Yamada
- 👤 Takeshi Kobayashi
- 👤 Makoto Katsuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:54
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/401
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
143 words
A film image data reading apparatus comprising: lighting means for illuminating a film on which an image is recorded; photoelectric conversion means for converting the light of the image from the film into electrical image data; wavelength selection means disposed such as to be inserted into and withdrawn from an optical path between said lighting means and said photoelectric conversion means and adapted for transmitting mainly infrared rays; detection means for detecting the position of dust or a flaw on the film on the basis of the image data outputted from said photoelectric conversion means when said wavelength selection means is inserted in the optical path; and correction means for correcting the image data outputted from said photoelectric conversion means when said wavelength selection means is withdrawn from the optical path, in accordance with the result of detection conducted by said detection means.
Claim 2
Dependent Claim
143 words
A film image data reading apparatus comprising: lighting means for illuminating a film on which an image is recorded; photoelectric conversion means for converting the light of the image from the film into electrical image data; wavelength selection means disposed such as to be inserted into and withdrawn from an optical path between said lighting means and said photoelectric conversion means and adapted for transmitting mainly infrared rays; detection means for detecting the position of dust or a flaw on the film on the basis of the image data outputted from said photoelectric conversion means when said wavelength selection means is inserted in the optical path; and correction means for correcting the image data outputted from said photoelectric conversion means when said wavelength selection means is withdrawn from the optical path, in accordance with the result of detection conducted by said detection means.
Claim 3
Dependent Claim
40 words
A film image data reading apparatus according to claim 1, wherein said detection means is further adapted to measure the illumination intensity distribution produced by said lighting means on the basis of the image data from said photoelectric conversion means.
Claim 4
Dependent Claim
27 words
A film image data reading apparatus according to claim 1, wherein said correction means corrects the image data corresponding to the position detected by said detection means.
Claim 5
Dependent Claim
41 words
A film image data reading apparatus according to claim 1, further comprising displacement means for materially displacing said photoelectric conversion means from a focal position of a projection optical system when said wavelength selection means is placed in the optical path.
Claim 6
Dependent Claim
162 words
An image reading apparatus comprising: lighting means for illuminating a film on which an image is recorded; photoelectric conversion means for converting the light of the image from the film into electrical image data; detecting means for detecting a defective region of a plurality of regions of picture elements of the image on the basis of image data outputted from said photoelectric conversion means; judging means for judging the size of the defective region detected by said detection means; defect correction means for correcting the image data included in the defective region, said defect correction means performing the different correction operations in accordance with the size judged by said judging means; and wavelength selection means for transmitting mainly infrared rays, and wherein said detection means detects the defect region on the basis of the image data outputted from said photoelectric conversion means when said wavelength selection means is disposed in an optical path between said lighting means and said photoelectric conversion means.
Claim 7
Dependent Claim
162 words
An image reading apparatus comprising: lighting means for illuminating a film on which an image is recorded; photoelectric conversion means for converting the light of the image from the film into electrical image data; detecting means for detecting a defective region of a plurality of regions of picture elements of the image on the basis of image data outputted from said photoelectric conversion means; judging means for judging the size of the defective region detected by said detection means; defect correction means for correcting the image data included in the defective region, said defect correction means performing the different correction operations in accordance with the size judged by said judging means; and wavelength selection means for transmitting mainly infrared rays, and wherein said detection means detects the defect region on the basis of the image data outputted from said photoelectric conversion means when said wavelength selection means is disposed in an optical path between said lighting means and said photoelectric conversion means.
Claim 8
Dependent Claim
40 words
An image reading apparatus according to claim 5, wherein said judging means is adapted to judge whether the defective region extends over a predetermined number of picture elements in a direction of a main scanning of said photoelectric conversion means.
Claim 9
Dependent Claim
32 words
An image reading apparatus according to claim 5, wherein said detection means compares the image data with a predetermined reference signal so as to detect whether the image data is defect data.
Claim 10
Dependent Claim
24 words
An image reading apparatus according to claim 5, further comprising informing means for informing the user of the detection result of said detection means.
Claim 11
Dependent Claim
168 words
An image reading apparatus comprising: lighting means for illuminating a film on which an image is recorded; photoelectric conversion means for converting the light of the image from the film into electrical image data; detection means for detecting a defective picture element of the image on the basis of the image data outputted from said photoelectric conversion means; judging means for judging whether each of a plurality of regions into which the image is divided contains the defective picture element, in accordance with the result of detection conducted by said detection means; correction means for correcting the image data included in the region which is judged by said judging means to contain the defective picture element; and wavelength selection means for transmitting mainly infrared rays, and wherein said detection means detects the defective picture element on the basis of the image data outputted from said photoelectric conversion means when said wavelength selection means is disposed in an optical path between said lighting means and said photoelectric conversion means.
Claim 12
Dependent Claim
168 words
An image reading apparatus comprising: lighting means for illuminating a film on which an image is recorded; photoelectric conversion means for converting the light of the image from the film into electrical image data; detection means for detecting a defective picture element of the image on the basis of the image data outputted from said photoelectric conversion means; judging means for judging whether each of a plurality of regions into which the image is divided contains the defective picture element, in accordance with the result of detection conducted by said detection means; correction means for correcting the image data included in the region which is judged by said judging means to contain the defective picture element; and wavelength selection means for transmitting mainly infrared rays, and wherein said detection means detects the defective picture element on the basis of the image data outputted from said photoelectric conversion means when said wavelength selection means is disposed in an optical path between said lighting means and said photoelectric conversion means.
Claim 13
Dependent Claim
29 words
An image reading apparatus according to claim 9, wherein said photoelectric conversion means outputs the image data line, and said judging means conducts the judging operation line by line.
Claim 14
Dependent Claim
29 words
An image reading apparatus according to claim 9, wherein said detecting means compares the image data with a predetermined reference signal so as to detect a defective picture element.
Claim 15
Dependent Claim
31 words
An image reading apparatus according to claim 9, further comprising memory means for storing data representing the region which is judged by said judging means to contain the defective picture element.
Claim 16
Dependent Claim
34 words
An image reading apparatus according to claim 9, wherein said correction means performs the correction by using the image data of at least one picture element in the vicinity of the defective picture element.
Claim 17
Dependent Claim
37 words
A film image data reading apparatus according to claim 1, wherein said detection means compares the image data with a predetermined reference signal so as to detect the position of dust or a flaw on the film.
Claim 18
Dependent Claim
30 words
A film image data reading apparatus according to claim 1, further comprising memory means for storing data representing the position of dust or a flaw detected by said detection means.
Claim 19
Dependent Claim
34 words
A film image data reading apparatus according to claim 1, wherein said correction means performs the correction by using the image data in the vicinity of the position of the dust or the flaw.
Claim 20
Dependent Claim
28 words
An image reading apparatus according to claim 5, wherein said defect correction means performs the correction by using the image data in the vicinity of the defective region.
Claim 21
Dependent Claim
31 words
An image reading apparatus according to claim 17, wherein said defect correction means performs the correction by using different position image data in accordance with the size of the defective region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |