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    PIXEL CIRCUIT AND METHOD FOR VISION SENSOR
    1.
    发明申请
    PIXEL CIRCUIT AND METHOD FOR VISION SENSOR 审中-公开

    公开(公告)号：WO2021198498A1

    公开(公告)日：2021-10-07

    申请号：PCT/EP2021/058769

    申请日：2021-04-01

    Applicant: PROPHESEE

    Inventor： MATOLIN, Daniel ,  BOURKE, Denis ,  BOUVIER, Christian

    IPC: H04N5/3745 ,  G01J1/4228 ,  G01J1/46

    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.

    EVENT-BASED IMAGE SENSOR AND OPERATING METHOD THEREOF
    2.
    发明申请
    EVENT-BASED IMAGE SENSOR AND OPERATING METHOD THEREOF 审中-公开

    公开(公告)号：WO2019115517A1

    公开(公告)日：2019-06-20

    申请号：PCT/EP2018/084348

    申请日：2018-12-11

    Applicant: PROPHESEE

    Inventor： POSCH, Christoph ,  MATOLIN, Daniel

    IPC: H04N5/335 ,  H04N5/378 ,  H04N5/3745 ,  H04N5/341

    CPC classification number: H04N5/37455 ,  H04N5/341 ,  H04N5/37452

    Abstract: An event-based image sensor comprising a plurality of pixel circuits (1) each comprising: a photoreceptor circuit (10) comprising a light-sensitive element (101) configured for delivering at an output (11) a photoreceptor current (I PRout ), an analog bus (20), a bank of current memory cells connected to the analog bus (20), each adapted to store an electric current flowing in the analog bus (20) and to deliver an electric current stored within said current memory cell, wherein each pixel circuit (1) comprises a current comparator(50) comprising: -a current sign detector (51) connected to the analog bus (20) 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 (53, 54) having a state conditioned by the output of said current sign detector (51).

    EVENT FILTERING METHOD FOR OPERATING AN EVENT-BASED IMAGE SENSOR
    3.
    发明申请
    EVENT FILTERING METHOD FOR OPERATING AN EVENT-BASED IMAGE SENSOR 审中-公开

    公开(公告)号：WO2021180813A1

    公开(公告)日：2021-09-16

    申请号：PCT/EP2021/056101

    申请日：2021-03-10

    Applicant: PROPHESEE

    Inventor： LAGORCE, Xavier ,  MATOLIN, Daniel ,  BOURKE, Denis ,  FINATEU, Thomas

    IPC: H04N5/341 ,  H04N5/3745

    Abstract: An event filtering method for operating an event-based image sensor comprising a plurality of pixel circuits comprising: - a photoreceptor circuit configured for delivering a photoreceptor signal, - a change detector configured for detecting a change in the photoreceptor signal, and emitting an event each time a change is detected, an event being characterized at least by a polarity reflecting a direction of the change, wherein an event filter (20) receives a series of events, and for each received event, the event filter either accepts or rejects the received event, the event filter (20) accepting the received event only if a first condition a) and a second condition b) are met: a) the received event has a same polarity as a polarity of a at least a last received event and, b) the received event and the last received event are separated by a time interval 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 审中-公开

    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.

    READOUT OF EVENTS FROM AN ARRAY OF AN EVENT-BASED IMAGE SENSOR AND PIXEL CIRCUIT
    5.
    发明申请
    READOUT OF EVENTS FROM AN ARRAY OF AN EVENT-BASED IMAGE SENSOR AND PIXEL CIRCUIT 审中-公开

    公开(公告)号：WO2021160859A1

    公开(公告)日：2021-08-19

    申请号：PCT/EP2021/053551

    申请日：2021-02-12

    Applicant: PROPHESEE

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

    IPC: H04N5/341

    Abstract: A circuit includes a selection circuit electrically coupled to pixels of a line of an event vision sensor. The selection circuit is configured to receive an activation signal from an active pixel of the line, generate an acknowledge signal in response to receiving the activation signal, and send the acknowledge signal to the pixels of the line. The circuit also includes a control circuit that is electrically coupled to a pixel having a largest distance to the selection circuit among the pixels of the line. The control circuit is configured to receive the acknowledge signal from the selection circuit, and generate a process-reading signal in response to receiving the acknowledge signal. The circuit also includes an interface circuit electrically coupled to the pixels of the line and configured to cause a reset of the selection circuit, the control circuit, and the pixels of the line after receiving the process-reading signal.

    SYSTEMS AND METHODS FOR ASYNCHRONOUS, TIME-BASED IMAGE SENSING
    6.
    发明申请
    SYSTEMS AND METHODS FOR ASYNCHRONOUS, TIME-BASED IMAGE SENSING 审中-公开

    公开(公告)号：WO2019211317A1

    公开(公告)日：2019-11-07

    申请号：PCT/EP2019/061133

    申请日：2019-04-30

    Applicant: PROPHESEE

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

    IPC: H04N5/3745 ,  H04N5/378

    Abstract: An image sensor includes a plurality of pixels, each pixel including a photosensitive element, and a photo-signal converter adapted to provide, on a first output, a current signal linearly proportional to the intensity of light impinging on the photosensitive element and to provide, on a second output, a voltage signal logarithmic with the intensity of light impinging on the photosensitive element. Each pixel further includes a detector adapted to generate a trigger signal when a signal of the detector proportional to the voltage signal of the second output of the photo- signal converter exceeds a threshold, and a light-to-time converter adapted to measure and encode, in the time domain, light intensity on the photosensitive element. A light-to-time conversion cycle may be initiated by the light-to-time converter in response to receipt of the trigger signal.

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