Event filtering method for operating an event-based image sensor

An event-based image sensor comprising a plurality of pixel circuits forming a pixel array, each pixel circuit comprising a photoreceptor circuit configured to generate a photoreceptor signal derived from a photocurrent generated by a light impinging on a light-sensitive element of the photoreceptor circuit, and a detector configured to detect a change in the photoreceptor signal and to generate an event in response to the detected change in the photoreceptor signal, the event including a signal indicating a polarity associated with a direction of the change, the event-based image sensor further comprising:

• a processing chain comprising at least one pixel circuit of the plurality of pixel circuits, an arbiter, a sensor driving circuit, and a host, wherein the generated event is sent to at least one of the arbiter, to the sensor driving circuit, and to the host;
• and
• an event filter configured to receive the generated event, and to accept the received event based on a plurality of conditions, the plurality of conditions including that the received event is part of a previously unaccepted event trail, the event trail comprising a plurality of successive events having a same polarity and separated by time intervals each shorter than a time threshold.