公开(公告)号：WO2020165106A1

公开(公告)日：2020-08-20

申请号：PCT/EP2020/053366

申请日：2020-02-10

Applicant: PROPHESEE

Inventor： PERRONE, Daniele ,  LAGORCE, Xavier ,  SCHAMBACH COSTA, Vitor ,  CHOTARD, Ludovic ,  BROHAN, Sylvain

IPC: H04N5/232 ,  H04N5/341 ,  H04N5/378 ,  H04N5/76 ,  H04N5/91

Abstract: The method processes a series of events received asynchronously from an array of pixels of an event-based light sensor. Each event of the series comprises an address of a pixel of the array from which the event is received, and an attribute value depending on incident light sensed by that pixel. The method comprises: storing a data structure in a first memory, the data structure including event data for at least some of the pixels of the array, the event data for a pixel being related to at least one event most recently received from said pixel; during a timeslot, building, in a second memory having a faster access than the first memory, a map for the pixels of the array as the events of the series are received, the map including an information element for each pixel of the array, the information element having one of a plurality of values including a nil value indicating an absence of event during the timeslot; and updating the data structure after the timeslot using the map.

公开(公告)号：WO2020002562A1

公开(公告)日：2020-01-02

申请号：PCT/EP2019/067264

申请日：2019-06-27

Applicant: PROPHESEE

Inventor： FINATEU, Thomas ,  MATOLIN, Daniel ,  POSCH, Christoph

IPC: H04N5/345 ,  H04N5/3745

Abstract: The present disclosure generally relates to image sensors and methods for image sensing. More specifically, and without limitation, this disclosure relates to systems and methods for providing super-pixels, and implementing and using image sensors with super-pixels. In one implementation, an image sensor includes a plurality of super-pixels. Each super-pixel may include a first photosensitive element; a detector electrically connected to the first photosensitive element and configured to generate a trigger signal when an analog signal proportional to brightness of light impinging on the first photosensitive element matches a condition; a second photosensitive element; an exposure measurement circuit electrically connected to the second photosensitive element and configured to convert an analog signal proportional to brightness of light impinging on the second photosensitive element to a digital signal; and a logic circuit electrically connected to the detector and the exposure measurement circuit and configured to enable the exposure measurement circuit in response to the trigger signal and to disable the exposure measurement circuit when the digital signal is read out from the exposure measurement circuit.

公开(公告)号：WO2019145516A1

公开(公告)日：2019-08-01

申请号：PCT/EP2019/051919

申请日：2019-01-25

Applicant: PROPHESEE

Inventor： SIRONI, Amos ,  ROUSSEAU, Marc

IPC: H04N5/341

CPC classification number: H04N5/341

Abstract: For processing a signal from an event-based sensor having an array of sensing elements facing a scene, the method comprises: receiving the signal including, for each sensing element, successive events originating from said sensing element depending on variations of incident light from the scene; analyzing the signal to detect a frequency pattern in a light profile sensed by at least one sensing element; and extracting information from the scene in response to detection of the frequency pattern.

公开(公告)号：US20250124549A1

公开(公告)日：2025-04-17

申请号：US18911542

申请日：2024-10-10

Applicant: PROPHESEE

Inventor： Daniele PERRONE ,  Amos SIRONI

IPC: G06T5/50 ,  G06T5/73 ,  G06V10/24 ,  H04N23/745

Abstract: An image enhancement method using multi-frame stacking comprises the steps of storing multiple frames of a target scene captured by a frame-based camera during an acquisition interval; storing a series of events produced during the acquisition interval by an event-based camera viewing the target scene; synchronizing timestamps of the events and timestamps of the frames; selecting an anchor frame among the multiple frames; aligning a current frame with respect to the anchor frame, based on stored events having timestamps corresponding to an interval between the anchor frame and the current frame; and merging the aligned frame and the anchor frame.

公开(公告)号：US12131544B2

公开(公告)日：2024-10-29

申请号：US17611021

申请日：2020-05-14

Applicant: PROPHESEE

Inventor： Nicolas Bourdis ,  Davide Migliore

IPC: G06V10/143 ,  G06T7/246 ,  G06V10/75 ,  G06V20/52 ,  G06V20/90 ,  G06V10/24

CPC classification number: G06V20/52 ,  G06T7/246 ,  G06V10/143 ,  G06V20/90 ,  G06T2207/10016 ,  G06T2207/30204 ,  G06V10/245

Abstract: A method for capturing motion of an object, the method comprising: installing at least one marker on the object; bringing the object having the at least one marker installed thereon in an acquisition volume; arranging at least two event-based light sensors such that respective fields of view of the at least two event-based light sensors cover the acquisition volume, wherein each event-based light sensor has an array of pixels; receiving events asynchronously from the pixels of the at least two event-based light sensors depending on variations of incident light from the at least one marker sensed by the pixels; and processing the events to position the at least one marker within the acquisition volume and capture motion of the object.

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：US20220264050A1

公开(公告)日：2022-08-18

申请号：US17662412

申请日：2022-05-06

Applicant: Prophesee SA

Inventor： Thomas FINATEU ,  Daniel MATOLIN ,  Christoph POSCH

IPC: H04N5/3745 ,  H04N5/378 ,  H04N5/369 ,  H04N5/345 ,  H04N5/355

Abstract: The present disclosure generally relates to image sensors and methods for image sensing. More specifically, and without limitation, this disclosure relates to systems and methods for providing super-pixels, and implementing and using image sensors with super-pixels. In one implementation, an image sensor includes a plurality of super-pixels. Each super-pixel may include a first photosensitive element; a detector electrically connected to the first photosensitive element and configured to generate a trigger signal when an analog signal proportional to brightness of light impinging on the first photosensitive element matches a condition; a second photosensitive element; an exposure measurement circuit electrically connected to the second photosensitive element and configured to convert an analog signal proportional to brightness of light impinging on the second photosensitive element to a digital signal; and a logic circuit electrically connected to the detector and the exposure measurement circuit and configured to enable the exposure measurement circuit in response to the trigger signal and to disable the exposure measurement circuit when the digital signal is read out from the exposure measurement circuit.

公开(公告)号：US20220166944A1

公开(公告)日：2022-05-26

申请号：US17534884

申请日：2021-11-24

Applicant: Prophesee

Inventor： Xavier Lagorce ,  Artiom Tchouprina

IPC: H04N5/353 ,  H04N5/232 ,  H04N5/225

Abstract: A method is generally provided for adjusting a pattern projection rate in an active perception system, comprising the steps of observing a scene with an event-based sensor array; projecting a current light pattern of a sequence of light patterns on the scene for a given interval of time; retrieving events generated by the event-based sensor array in response to the projection of the current light pattern; monitoring a property of the event retrieval progress; and dynamically controlling the projection of the light pattern based on the property.

公开(公告)号：US11317045B2

公开(公告)日：2022-04-26

申请号：US16771665

申请日：2018-12-11

Applicant: PROPHESEE

Inventor： Christoph Posch ,  Daniel Matolin

IPC: H04N5/3745 ,  H04N5/376

Abstract: An event-based image sensor is provided that includes a plurality of pixel circuits. Each pixel circuit includes a photoreceptor circuit with a light-sensitive element configured for delivering at an output a photoreceptor current, an analog bus, and a bank of current memory cells connected to the analog bus. An output of the photoreceptor circuit is selectively connected to the analog bus. Each current memory cell is adapted to store an electric current flowing in the analog bus and to deliver an electric current stored within the current memory cell. Each pixel circuit may further include a current comparator including a current sign detector connected to the analog bus and configured for comparing a value of a compared electric current resulting from a difference between the photoreceptor current and a previous photoreceptor current stored in a current memory cell. At least one storage cell may also be provided that has a state conditioned by the output of the current sign detector.

公开(公告)号：US20220101640A1

公开(公告)日：2022-03-31

申请号：US17427033

申请日：2020-01-29

Applicant: PROPHESEE

Inventor： Xavier LAGORCE

IPC: G06V20/70 ,  G06F16/583 ,  G06V10/60 ,  G06T7/269 ,  G06T7/50 ,  G06V10/762 ,  G06V10/44

Abstract: An event-based sensor has an array of pixels facing a scene. The information to be processed includes events originating from the pixels depending on variations of incident light from the scene. A method includes storing a data structure for a set of pixels of the array, the data structure including, for each pixel of the set, event data associated with a most recent event originating from the pixel. Upon receiving a current event from a first pixel of the array, the method includes retrieving any event data included in the data structure for a group of pixels including the first pixel and a plurality of second pixels adjacent to the first pixel in the array. The current event is labelled based on at least one connectivity criterion between the current event and the most recent event originating from a pixel of the group.