US5034825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High quality image scanner
Assignee: Ricoh Co Ltd
•
Filing: 1989-05-17
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Granted: 1991-07-23
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Expires: 2009-05-17
Abstract
Abstract A high quality image scanner is provided which processes multiple scanned images into a composite image with a large dynamic range. The two scanned images are processed to identify maximum local similarity.
Inventors
- 👤 Koichi Ejiri
- 👤 Kevin Corcoran
- 👤 Sanjiv Arora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
An image scanner comprising means for scanning an image on a document with a first low illumination level, means for scanning said image with a second high illumination level, means for storing the relative positions of the first and second scanned images where there is a shift distance between said scanned images, means for determining the corresponding positions in the first and second scanned images, and means for combining said first and second scanned images into a composite image.
Claim 2
Dependent Claim
79 words
An image scanner comprising means for scanning an image on a document with a first low illumination level, means for scanning said image with a second high illumination level, means for storing the relative positions of the first and second scanned images where there is a shift distance between said scanned images, means for determining the corresponding positions in the first and second scanned images, and means for combining said first and second scanned images into a composite image.
Claim 3
Dependent Claim
22 words
The image scanner as in claim 1 including filter shutter means for scanning said image with said first and second illumination levels.
Claim 4
Dependent Claim
19 words
The image scanner as in claim 2 including buffer memory means for storing the first and second scanned images.
Claim 5
Dependent Claim
25 words
The image scanner as in claim 3 including image processor means for processing the scanned images in said buffer means to form said composite image.
Claim 6
Dependent Claim
28 words
The scanner as in claim 4 including means for determining the shift distance between the positions of said first and second images stored in said buffer memory means.
Claim 7
Dependent Claim
15 words
The scanner as in claim 5 including means for manipulating tonal variations in the image.
Claim 8
Dependent Claim
15 words
The scanner as in claim 6 including means for compensating for non-uniformity in the image.
Claim 9
Dependent Claim
39 words
An image scanner comprising means for scanning an image on a document with multiple illumination levels, means for determining the corresponding positions in the multiple scanned images, and means for combining said multiple scanned images into a composite image.
Claim 10
Dependent Claim
39 words
An image scanner comprising means for scanning an image on a document with multiple illumination levels, means for determining the corresponding positions in the multiple scanned images, and means for combining said multiple scanned images into a composite image.
Claim 11
Dependent Claim
78 words
In an image scanner, the method comprising the steps of scanning an image on a document with a first low illumination level, scanning said image with a second high illumination level, storing the relative positions of the first and second scanned images where indicated where there is a shift distance between said scanned images, determining the corresponding positions in the first and second scanned images, and combining the first and second scanned images to form a composite image.
Claim 12
Dependent Claim
78 words
In an image scanner, the method comprising the steps of scanning an image on a document with a first low illumination level, scanning said image with a second high illumination level, storing the relative positions of the first and second scanned images where indicated where there is a shift distance between said scanned images, determining the corresponding positions in the first and second scanned images, and combining the first and second scanned images to form a composite image.
References Cited (Backward Citations)
US4853739A
Cited
US4910601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |