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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.
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公开(公告)号：US20240214708A1
公开(公告)日：2024-06-27
申请号：US18393218
申请日：2023-12-21
Applicant: PROPHESEE
Inventor： Thomas FINATEU , Christian BOUVIER
IPC: H04N25/78 , H01L27/146
CPC classification number: H04N25/78 , H01L27/14607 , H01L27/1461
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：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
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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公开(公告)号：US20240374133A1
公开(公告)日：2024-11-14
申请号：US18659954
申请日：2024-05-09
Applicant: PROPHESEE
Inventor： Xavier LAGORCE , Germain HAESSIG , Damien JOUBERT , Thomas FINATEU
Abstract: A method for detecting a pupil of an eye with an event-based vision sensor, comprises the steps of directing a first light source towards the eye; observing the eye with the event-based vision sensor; and intermittently submitting the event-based vision sensor to a uniform background signal.
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公开(公告)号：US20210235028A1
公开(公告)日：2021-07-29
申请号：US17051148
申请日：2019-04-30
Applicant: PROPHESEE
Inventor： Thomas FINATEU , Daniel MATOLIN , Christoph POSCH
IPC: H04N5/353 , H04N5/378 , H04N5/3745
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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Patent Agency Ranking
公开(公告)号：US20230125031A1
公开(公告)日：2023-04-20
申请号：US17906063
申请日：2021-03-10
Applicant: PROPHESEE
Inventor： Lagorce XAVIER , Daniel MATOLIN , Denis BOURKE , Thomas FINATEU
IPC: H04N25/47 , H04N25/76 , H04N25/771 , H04N25/707
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 signa. 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：US20210127083A1
公开(公告)日：2021-04-29
申请号：US17255972
申请日：2019-06-27
Applicant: PROPHESEE SA
Inventor： Thomas FINATEU , Daniel MATOLIN , Christoph POSCH
IPC: H04N5/3745 , H04N5/345
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：US20190273884A1
公开(公告)日：2019-09-05
申请号：US16343720
申请日：2017-10-19
Applicant: PROPHESEE , CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS
IPC: 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：US20240267642A1
公开(公告)日：2024-08-08
申请号：US18432769
申请日：2024-02-05
Applicant: PROPHESEE
Inventor： Thomas FINATEU , Farzaneh SHAHROKHI
Abstract: An event-based vision sensor comprises an array of pixel circuits, each configured to produce a respective photocurrent, wherein the array of pixel circuits is divided into one or more clusters of multiple pixel circuits; and a cluster control circuit configured, for each cluster, to generate (i) a summation of the photocurrents produced by the pixel circuits of the cluster and (ii) cluster events based on changes in the summation of the photocurrents.
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公开(公告)号：US20240205567A1
公开(公告)日：2024-06-20
申请号：US18540381
申请日：2023-12-14
Applicant: Prophesee
Inventor： Thomas FINATEU , Daniel Matolin , Christoph Posch
IPC: H04N25/772 , H04N25/47 , H04N25/57 , H04N25/778 , H04N25/79
CPC classification number: H04N25/772 , H04N25/47 , H04N25/57 , H04N25/778 , H04N25/79 , H01L27/14634
Abstract: A pixel circuit is provided for use in an event sensor. In one implementation, the pixel circuit includes a photosensitive element configured to generate a current signal in response to brightness of light impinging on the photosensitive element, a first N-type transistor, a second N-type transistor, a first P-type transistor including a gate connected to a first bias voltage, a second P-type transistor including a gate connected to a second bias voltage, the second bias voltage being an adjustable DC bias voltage that is adjusted according to at least one of a sensed temperature or a fabrication process variation of the pixel circuit, and a voltage output that varies in response to the brightness of light impinging on the photosensitive element. An adjustment of the second bias voltage causes a DC level of the voltage output to shift up or down without changing the overall gain of the pixel circuit. The pixel circuit may also include one or more additional N-type transistors for increasing performance by optimizing contrast sensitivity. The pixel circuit may further include a converter, a capacitor electrically coupled to the converter, and an amplifier electrically coupled to the capacitor. Further, the pixel circuit may be implemented in a stacked wafer configuration and one or more interconnects between wafers.
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