Abstract
An integrated dual-spectrum camera module and calibration method combine a visible-light (RGB) imaging channel and a long-wave infrared (LWIR) thermal-imaging channel within a common enclosure. An electronically controlled actuator moves an internal spectrally selective shutter, such as a silicon/germanium (Si/Ge) optical element, between an open operating state and a closed calibration state. In the open operating state, the shutter is retracted and substantially simultaneous RGB and LWIR frames are processed using stored and/or dynamically updated registration parameters to produce corrected, registered, or fused dual-spectrum outputs. In the closed calibration state, the shutter provides an optically blocked black-reference frame for RGB black-level and dark-signal correction while transmitting a measurable portion of incident LWIR energy. Corresponding open-state and closed-state LWIR measurements are used to determine a shutter transmission coefficient, an inverse compensation factor, and/or an offset term after sensor-offset correction. A calibration and fusion processor apply the channel-specific corrections and geometric mapping to generate corrected RGB imagery, calibrated LWIR measurement data, registered frame pairs, and optional fused imagery.
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Recommended Citation
INC, HP, "Integrated Dual-Spectrum Camera Module Calibration Solution", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/12386