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Auto Gain Control & Non Uniformity Correction

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Auto Gain Control & Non Uniformity Correction

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The sandwich architecture described above makes it extremely difficult to manufacture a sensor where all the pixels are fully functional. Issues between the InGaAs layer, the indium dots and the CMOS ROIC are inevitable. Therefore, all SWIR cameras have a pixel operability specification describing how many pixels are operating within normal parameters. Typically the best camera achieves 99% to 99.5% pixel operability. The remaining 1% to 0.5% pixels can be, dead, hot or simply vary too much from the average. These must be compensated for to achieve a good image quality. As well as offering NUC in real-time, Raptor’s family of SWIR cameras are also capable of continuously performing the Auto Gain Control (AGC) on the onboard FPGA. The AGC constantly checks the signal level and automatically adapts the exposure time and the digital gain accordingly.

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