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公开(公告)号：US10721423B2
公开(公告)日：2020-07-21
申请号：US16343720
申请日：2017-10-19
Applicant: PROPHESEE , CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS
IPC: H04N5/374 , H04N5/335 , H04N5/3745
Abstract: A pixel circuit for detecting time-dependent visual data includes a photo sensing device detecting a light intensity and generating a signal representing the detected light intensity. The pixel circuit further includes: a voltage amplifier configured for amplifying the signal representing the detected light intensity and generating an amplified signal, the amplified signal being generated by taking into account a control signal which shifts an input voltage offset of the voltage amplifier; a hysteresis comparing module configured for comparing the amplified signal to at least one threshold value and to a reference value and for generating at least one output signal based on the comparison; and a feedback control module configured for generating the control signal of the voltage amplifier based on the at least one output signal generated by the hysteresis comparing module.
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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.
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公开(公告)号：US11368645B2
公开(公告)日：2022-06-21
申请号：US17255972
申请日：2019-06-27
Applicant: Prophesee SA
Inventor： Thomas Finateu , Daniel Matolin , Christoph Posch
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.
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公开(公告)号：US10469776B2
公开(公告)日：2019-11-05
申请号：US16090979
申请日：2017-04-04
Applicant: Prophesee , Consejo Superior de Investigaciones Cientificas
IPC: H04N5/355 , H04N5/3745 , H04N5/357 , H04N5/378
Abstract: This invention relates to a pixel circuit comprising a photo-sensor stage comprising a photodiode delivering a photoreceptor current, a comparison stage configured for detecting a change in a signal voltage derived from said photoreceptor current, a sample-and-hold circuit connected to the converting stage and to the comparison stage, said comparison stage configured to output an input signal for the sample-and-hold circuit, and for emitting a sampling signal to a control terminal of the sample-and-hold circuit when a change is detected in the signal voltage.
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Patent Agency Ranking
公开(公告)号：US12250488B2
公开(公告)日：2025-03-11
申请号：US18393218
申请日：2023-12-21
Applicant: PROPHESEE
Inventor： Thomas Finateu , Christian Bouvier
IPC: H04N25/78 , H01L27/146
Abstract: A merged frame-based and event-based image sensor pixel is provided, comprising a reverse-biased photodiode; a frame-based signal readout circuit connected to a cathode of the photodiode; and an event-based signal readout circuit connected to an anode of the photodiode. Light received in the photodiode causes the production of electrons and holes. The recombination current of the holes is continuously measured for producing the event-based signal.
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公开(公告)号：US11184572B2
公开(公告)日：2021-11-23
申请号：US17174499
申请日：2021-02-12
Applicant: PROPHESEE
Inventor： Daniel Matolin , Thomas Finateu , Massimiliano Giulioni , Christoph Posch
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.
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公开(公告)号：US11979673B2
公开(公告)日：2024-05-07
申请号：US17662412
申请日：2022-05-06
Applicant: Prophesee SA
Inventor： Thomas Finateu , Daniel Matolin , Christoph Posch
IPC: H04N25/47 , H04N25/443 , H04N25/583 , H04N25/59 , H04N25/709 , H04N25/75 , H04N25/771 , H04N25/772 , H04N25/778 , H04N25/79 , H04N25/133
CPC classification number: H04N25/47 , H04N25/443 , H04N25/583 , H04N25/59 , H04N25/709 , H04N25/75 , H04N25/771 , H04N25/772 , H04N25/778 , H04N25/79 , H04N25/133
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.
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公开(公告)号：US11412162B2
公开(公告)日：2022-08-09
申请号：US17051148
申请日：2019-04-30
Applicant: PROPHESEE
Inventor： Thomas Finateu , Daniel Matolin , Christoph Posch
IPC: H04N5/353 , 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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公开(公告)号：US10904465B2
公开(公告)日：2021-01-26
申请号：US16666387
申请日：2019-10-28
Applicant: Prophesee , Consejo Superior de Investigaciones Cientificas
IPC: H04N5/355 , H04N5/3745 , H04N5/357 , H04N5/378
Abstract: This invention relates to a pixel circuit comprising a photo-sensor stage (10) comprising a photodiode (1) delivering a photoreceptor current (Iph), a comparison stage (30) configured for detecting a change in a signal voltage (Vph) derived from said photoreceptor current, a sample-and-hold circuit (50) connected to the converting stage (20) and to the comparison stage (30), said comparison stage (30) configured to output an input signal for the sample-and-hold circuit (50), and for emitting a sampling signal to a control terminal of the sample-and-hold circuit (50) when a change is detected in the signal voltage (Vph).
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