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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.
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公开(公告)号：US11885669B2
公开(公告)日：2024-01-30
申请号：US17594551
申请日：2020-04-24
Applicant: PROPHESEE
Inventor： Geoffrey F. Burns , Manuele Brambilla , Christoph Posch , Gaspard Florentz , Stephane Valente
IPC: G01H9/00
CPC classification number: G01H9/002
Abstract: The present disclosure generally relates to systems and methods for imaging and sensing vibrations of an object. In one implementation, a system is provided for detecting vibrations that comprises a sensor with a plurality of pixels, each pixel including at least one photosensitive element. The sensor is configured to output signals related to illumination on each pixel. The system also includes at least one processor configured to receive the output signals from the sensor and detect, based on the output signals, one or more polarities. The at least one processor is also configured to determine timestamps associated with the output signals, analyze the timestamps and the polarities to detect vibrations of an object in the field of view of the sensor, and determine one or more frequencies of the detected vibrations.
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公开(公告)号：US20220191393A1
公开(公告)日：2022-06-16
申请号：US17686712
申请日：2022-03-04
Applicant: PROPHESEE
Inventor： Amos Sironi , Marc Rousseau , Christoph Posch , Xavier Lagorce
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.
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公开(公告)号：US11303804B2
公开(公告)日：2022-04-12
申请号：US16963944
申请日：2019-01-25
Applicant: PROPHESEE
Inventor： Amos Sironi , Marc Rousseau , Christoph Posch , Xavier Lagorce
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.
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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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Patent Agency Ranking
公开(公告)号：US11212470B2
公开(公告)日：2021-12-28
申请号：US16701423
申请日：2019-12-03
Applicant: Prophesee
Inventor： Daniel Matolin , Christoph Posch
IPC: H04N5/355 , H04N5/3745 , H04N5/374 , H04N5/341 , H04N3/14 , H04N5/335 , H04N5/235 , H04N5/378 , H01L27/146 , H04N5/345
Abstract: The invention relates to pixel circuit and an operating method thereof, comprising—a front-end circuit (1) comprising a single photodiode (PD) and having an output (4), said front-end circuit (1) being configured for delivering on said output a photoreceptor signal derived from a light exposure of said single photodiode (PD);—a transient detector circuit (2) configured for detecting a change in said photoreceptor signal delivered on said output (4);—an exposure measurement circuit (3) configured for measuring said photoreceptor signal delivered on said output (4) upon detection by the transient detector circuit (2) of a change in the photoreceptor signal. The invention also relates to an image sensor comprising a plurality of pixel circuits
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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：US11856290B2
公开(公告)日：2023-12-26
申请号：US17686712
申请日：2022-03-04
Applicant: PROPHESEE
Inventor： Amos Sironi , Marc Rousseau , Christoph Posch , Xavier Lagorce
CPC classification number: H04N23/665 , H04N23/57 , H04N25/40
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.
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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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