A signal-to-noise ratio comparison of high dynamic range CMOS image sensors
2009
There have been many reports of application-specific or custom designed high dynamic range (HDR) CMOS
image sensors. To achieve their extended dynamic range, these sensors utilize techniques that can
significantly degrade their signal-to-noise ratios (SNR). We utilize a simplified sensor model to compare two
HDR techniques with a conventional APS sensor regarding their SNR and dynamic range (DR). We perform a
new analysis of a mixed APS and time-to-saturation sensor that shows that it can detect similar high
illuminations levels that the multiple capture sensor without degrading the SNR at lower levels. Furthermore,
the time-to-saturation sensor can be adjusted on-the-fly to detect specific illumination levels with optimized
image quality.
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