Patent US3793090A successfully refreshed from Google Patents.
Patent US4899393A successfully refreshed from Google Patents.
US4899393A
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Method for image registration
Assignee: Hitachi Healthcare Manufacturing Ltd
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Filing: 1987-02-10
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Granted: 1990-02-06
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Expires: 2007-02-10
Abstract
Abstract In order to extract correctly an intended region by correcting the distortion of two images due to different time points of observation, an emphasis factor which depends on the standard deviation of the image gray value within the intended region is evaluated, and the intended region for registration is selected after adaptive filtering with characteristics determined by the emphasis factor.
Inventors
- 👤 Koichi Morishita
- 👤 Tetsuo Yokoyama
- 👤 Kazuhiro Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:23
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4053; G06T3/4061; G06T5/00; G06T5/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A method for image registration comprising the steps of: taking first and second images of a certain region of a test object under different conditions; adaptively selecting high frequency component emphasis coefficients corresponding to the image gray value of a desired portion to be registered in said certain region; performing a high frequency emphasis filtering processing for the entire region of said first and second images using the adaptively selected emphasis coefficient; defining a desired portion of said first and second images after the filtering processing; and performing image registration between the images of the defined desired portion.
Claim 2
Independent Claim
98 words
A method for image registration comprising the steps of: taking first and second images of a certain region of a test object under different conditions; adaptively selecting high frequency component emphasis coefficients corresponding to the image gray value of a desired portion to be registered in said certain region; performing a high frequency emphasis filtering processing for the entire region of said first and second images using the adaptively selected emphasis coefficient; defining a desired portion of said first and second images after the filtering processing; and performing image registration between the images of the defined desired portion.
Claim 3
Dependent Claim
41 words
A method for image registration according to claim 1, wherein said step of selecting high frequency component emphasis coefficients comprises changing the emphasis coefficients in accordance with the standard deviations of the gray values of the images at the desired portions.
Claim 4
Dependent Claim
51 words
A method for image registration according to claim 1, wherein said step of selecting high frequency component emphasis coefficientscomprises changing the emphasis coefficients in accordance with a monotone increasing function or a monotone decreasing function corresponding to said standard deviation according to a variation of the gray value of the image.
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |