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US4879598A
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Infrared video camera shading correction device
Assignee: Mitsubishi Electric Corp
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Filing: 1988-11-28
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Granted: 1989-11-07
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Expires: 2008-11-28
Abstract
Abstract An infrared video camera shading correction device which includes an averaging circuit for averaging during a few frames the output of an infrared image sensor to provide an average output, a shading pattern generator for generating a shading pattern similar to that of an optics of the infrared video camera, a multiplier for multiplying the average output by the shading pattern signal to provide a multiplication output, and a subtractor for subtracting the multiplication output from the infrared video signal of the infrared image pickup section for effecting shading correction.
Inventors
- 👤 Toshiki Seto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:33
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/33; H04N25/00; H04N25/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A device for correcting a shading in an infrared video camera including an optical section and an infrared image pickup section, which comprises: an averaging circuit for averaging during a few frames an output of said infrared image pickup section to provide an average output; a shading pattern generator for generating a shading pattern signal similar to that of said optical section; a multiplier for multiplying said average output by said shading pattern signal to provide a multiplication output; and a subtractor for subtracting said multiplication output from an infrared video output of said image pickup section.
Claim 2
Independent Claim
97 words
A device for correcting a shading in an infrared video camera including an optical section and an infrared image pickup section, which comprises: an averaging circuit for averaging during a few frames an output of said infrared image pickup section to provide an average output; a shading pattern generator for generating a shading pattern signal similar to that of said optical section; a multiplier for multiplying said average output by said shading pattern signal to provide a multiplication output; and a subtractor for subtracting said multiplication output from an infrared video output of said image pickup section.
Claim 3
Dependent Claim
26 words
The device of claim 1, wherein said averaging circuit comprises a time constant circuit having a time constant equal to a period of a few frames.
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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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |