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EP0324925A2
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Infrared video camera shading correction device
Assignee: Mitsubishi Electric Corp
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Filing: 1988-11-25
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Granted: —
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Expires: 2008-11-25
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 Mitsubishi Denki K.K. Seto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:52
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/33; H04N25/00; H04N25/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 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 the infrared image pickup section to provide an average output; a shading pattern generator for generating a shading pattern signal similar to that of the optical section; a multiplier for multiplying the average output by the shading pattern signal to provide a multiplication output; a subtractor for the multiplication output from an output of the image pickup section.
Claim 2
Independent Claim
93 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 the infrared image pickup section to provide an average output; a shading pattern generator for generating a shading pattern signal similar to that of the optical section; a multiplier for multiplying the average output by the shading pattern signal to provide a multiplication output; a subtractor for the multiplication output from an output of the 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.
References Cited (Backward Citations)
No citation records indexed.
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