公开(公告)号：US11689824B2

公开(公告)日：2023-06-27

申请号：US17906063

申请日：2021-03-10

Applicant: PROPHESEE

Inventor： Lagorce Xavier ,  Daniel Matolin ,  Denis Bourke ,  Thomas Finateu

IPC: H04N25/47 ,  H04N25/707 ,  H04N25/771 ,  H04N25/76

CPC classification number: H04N25/47 ,  H04N25/707 ,  H04N25/771 ,  H04N25/7795

Abstract: Embodiments of the present disclosure include an event-based image sensor and an event filtering method for use with an event-based image sensor. The event-based image sensor comprises 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-based image sensor further includes a processing chain and an event filter that is configured to receive the generated event and to accept the received event based on a plurality of conditions. The plurality of conditions include a condition 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.

公开(公告)号：US11885673B2

公开(公告)日：2024-01-30

申请号：US17220761

申请日：2021-04-01

Applicant: PROPHESEE

Inventor： Daniel Matolin ,  Denis Bourke ,  Christian Bouvier

IPC: G01J1/42 ,  G01J1/46 ,  H04N25/77 ,  H04N25/778 ,  H04N25/766

CPC classification number: G01J1/4228 ,  G01J1/46 ,  H04N25/766 ,  H04N25/77 ,  H04N25/778

Abstract: A pixel circuit is provided for use in an image sensor. The pixel circuit includes a photosensitive element configured to generate a current signal in response to brightness of light impinging on the photosensitive element, and a converter configured to receive the current signal from the photosensitive element and generate a voltage signal based on the received current signal. The pixel circuit also includes a capacitor electrically coupled to the converter in series and configured to receive the voltage signal from the converter, and an amplifier electrically coupled, at an input, to the capacitor in series and configured to generate, at an output, an amplified signal based on an output signal from the capacitor, wherein there is no feedback between the output and the input of the amplifier. Further, the pixel circuit includes a reset device configured to reset the amplifier in response to a trigger signal being generated.