Stacked event-based vision sensor boasts highest HDR: Page 2 of 2

February 20, 2020 //By Julien Happich
vision sensor
French startup Prophesee S.A. and Sony Corporation have jointly developed a stacked event-based vision sensor with what they claim to be the industry’s smallest pixel size for this type of sensors (at 4.86x4.86μm) and the industry’s highest High Dynamic Range (at over 124dB).

The high HDR performance is made possible by placing only back-illuminated pixels and a part of N-type MOS transistor on the pixel chip (top), thereby allowing the aperture ratio to be enhanced by up to 77%. High sensitivity/low noise technologies Sony has developed over many years of CMOS image sensor development enable event detection in low-light conditions down to 40mlx.

While a frame-based sensor outputs entire images at fixed intervals according to the frame rate, an event-based sensor selects pixel data asynchronously using a row selection arbiter circuit. By adding time information at 1μs precision to the pixel address where a change in luminance has occurred, event data readout is ensured with high time resolution. The companies say the chip supports an output event rate up to 1.066Gevents/s by efficiently compressing the event data, i.e. luminance change polarity, time, and x/y coordinate information for each event.

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