Dynamic vision sensor

An apparatus, comprising:

• a sensor array, comprising a plurality of sensors, wherein each sensor of the plurality of sensors comprises:
• a respective photoelectric converter, configured to convert a received optical signal into an electrical signal, to generate a respective photovoltage;
• a respective second-order differential circuit, configured to perform second-order differential processing on the respective photovoltage, to generate a respective second-order differential voltage;
• and
• a respective comparison circuit, configured to:
• compare the respective second-order differential voltage with a second-order comparison threshold, to determine a respective comparison result;
• and
• generate a respective second-order event signal based on the respective comparison result;
• and
• send the respective second-order event signal to a peripheral circuit;
• and
• the peripheral circuit, configured to, for each received second-order event signal, generate an address event representation based on the respective second-order event signal, wherein each address event representation comprises the respective second-order event signal and position information of the sensor that generated the respective second-order event signal.

A method, comprising:

• converting an optical signal into an electrical signal, to generate a photovoltage;
• performing second-order differential processing on the photovoltage, to generate a second-order differential voltage;
• and
• comparing the second-order differential voltage with a second-order comparison threshold to determine a comparison result, and generating a second-order event signal based on the comparison result.