Techniques to compensate for calibration drifts in infrared imaging devices
First Claim
1. A method comprising:
- receiving image frames of a scene captured by a focal plane array (FPA) of an infrared imaging device;
detecting an external condition associated with a virtual-shutter non-uniformity correction (NUC) procedure;
processing at least one of the image frames in response to the detected external condition to obtain NUC teams without the use of a temperature controlled black body; and
storing the obtained NUC terms as one or more snapshots of NUC terms.
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Accused Products
Abstract
Various techniques are provided to compensate for and/or update ineffective (e.g., stale) calibration terms due to calibration drifts in infrared imaging devices. For example, a virtual-shutter non-uniformity correction (NUC) procedure may be initiated to generate NUC terms to correct non-uniformities when appropriate triggering events and/or conditions are detected that may indicate presence of an object or scene to act as a shutter (e.g., a virtual shutter). Scene-based non-uniformity correction (SBNUC) may be performed during image capturing operations of the infrared imaging device, for example, when a virtual-shutter scene is not available. Further, snapshots of calibration data (e.g., NUC terms) produced during the virtual-shutter NUC procedure, the SBNUC process, and/or other NUC process may be taken. Such snapshots may be utilized to provide useful NUC data when the infrared imaging device starts up or is otherwise reactivated, so that the SBNUC or other NUC methods may produce effective results soon after the start-up. Such snapshots may also be utilized to update ineffective calibration terms.
194 Citations
26 Claims
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1. A method comprising:
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receiving image frames of a scene captured by a focal plane array (FPA) of an infrared imaging device; detecting an external condition associated with a virtual-shutter non-uniformity correction (NUC) procedure; processing at least one of the image frames in response to the detected external condition to obtain NUC teams without the use of a temperature controlled black body; and storing the obtained NUC terms as one or more snapshots of NUC terms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device comprising:
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an infrared imaging device comprising a focal plane array (FPA) adapted to capture image frames of a scene; a memory adapted to store information; and a processor adapted to communicate with the infrared imaging device and the memory, the processor further adapted to; detect an external condition associated with a virtual-shutter non-uniformity correction (NUC) procedure, process at least one of the image frames in response to the detected external condition to obtain NUC teens without the use of a temperature controlled black body, and store, in the memory, the obtained NUC terms as one or more snapshots of NUC terms. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification