Non-linear statistical photocalibration of photodetectors without calibrated light sources
| Autor: | Stephen C. Cain |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
business.industry
Dynamic range Computer science Detector ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Photodetector 01 natural sciences Signal Atomic and Molecular Physics and Optics 010309 optics Optics 0103 physical sciences Calibration Radiance Quantum efficiency Electrical and Electronic Engineering business Engineering (miscellaneous) Radiometric calibration |
| Zdroj: | Applied optics. 59(9) |
| ISSN: | 1539-4522 |
| Popis: | Calibration of CCD arrays is commonly conducted using dark frames. Non-absolute calibration techniques only measure the relative response of the detectors. For absolute calibration to be achieved, a second calibration is sometimes utilized by looking at sources with known radiances. A process like this can be used to calibrate photodetectors if a calibration source is available and sensor time can be spared to perform the operation. A previous attempt at creating a procedure for calibrating a photodetector using the underlying Poisson nature of the photodetection statistics relied on a linear model. This effort produced the statistically applied non-uniformity calibration algorithm, which demonstrated an ability to relate the measured signal with the true radiance of the source. Reliance on a completely linear model does not allow for non-linear behaviors to be described, thus potentially producing poor photocalibration over large dynamic ranges. In this paper, a photocalibration procedure is defined that requires only first and second moments of the measurements and allows the response to be modeled using a non-linear function over the dynamic range of the detector. The technique is applied to image data containing a light source measured with different integration times showing that the non-linear technique achieves significant improvement over the linear model over a large dynamic range. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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