CMOS Image Sensor Using Negative-Feedback Resetting to Obtain Variably Smoothed Images
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We designed a CMOS image sensor capable of capturing variably smoothed images. This sensor uses a negative-feedback technique to set photodiode (PD) capacitance in the pixel circuit to any intermediate voltage during charge accumulation and it provides a neighboring-pixel operation by using their average value when resetting the PD capacitance. Smoothing-filter coefficients are changed by adjusting timing of the pixel-readout and neighboring-pixels operations. The performance of the proposed sensor was evaluated by SPICE simulation and numerical analysis.
- IEICE transactions on electronics
IEICE transactions on electronics 89(11), 1662-1669, 2006-11-01
The Institute of Electronics, Information and Communication Engineers