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    EVENT-BASED MOTION ESTIMATION FOR MULTI-FRAME STACKING
    1.
    发明申请
    EVENT-BASED MOTION ESTIMATION FOR MULTI-FRAME STACKING 有权

    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.

    Event filtering method for operating an event-based image sensor
    3.
    发明授权
    Event filtering method for operating an event-based image sensor 有权

    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.

    IMAGE SENSOR WITH A PLURALITY OF SUPER-PIXELS
    4.
    发明申请
    IMAGE SENSOR WITH A PLURALITY OF SUPER-PIXELS 有权

    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.

    METHOD FOR AUTOMATICALLY ADAPTING A PATTERN PROJECTION RATE IN AN ACTIVE PERCEPTION SYSTEM
    5.
    发明申请
    METHOD FOR AUTOMATICALLY ADAPTING A PATTERN PROJECTION RATE IN AN ACTIVE PERCEPTION SYSTEM 有权

    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.

    Event-based image sensor and operating method thereof
    6.
    发明授权
    Event-based image sensor and operating method thereof 有权

    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.

    METHOD OF PROCESSING INFORMATION FROM AN EVENT-BASED SENSOR
    7.
    发明申请
    METHOD OF PROCESSING INFORMATION FROM AN EVENT-BASED SENSOR 有权

    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.

    MONITORING AN EVENT QUEUE IN AN EVENT-BASED VISION SENSOR TO ACCOUNT FOR EVENT BURSTS
    9.
    发明申请
    MONITORING AN EVENT QUEUE IN AN EVENT-BASED VISION SENSOR TO ACCOUNT FOR EVENT BURSTS 有权

    公开(公告)号：US20240380993A1

    公开(公告)日：2024-11-14

    申请号：US18660930

    申请日：2024-05-10

    Applicant: PROPHESEE

    Inventor： Thomas FINATEU ,  Tjaart OPPERMAN

    IPC: H04N25/47 ,  H04N25/78

    Abstract: An event-based vision sensor, comprises an array of event-based pixels, each pixel configured to record events based on variations of a sensed photocurrent and enable, at the occurrence of an event, a request line common to pixels aligned along an axis of the array; a request arbiter configured to respond asynchronously to the enabled request lines by enqueuing corresponding line readout requests in a request queue; an event readout circuit connected to the request arbiter and configured to readout in parallel the events of a line of pixels corresponding to a current line readout request served by the arbiter; a queue length counter connected to the request lines to produce the request queue length; a queue monitor connected to the queue length counter, configured to generate an event burstiness indicator; and means configured to carry out a burstiness compensation action based on the event burstiness indicator.

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