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

IPC: H04N5/378 ,  H04N5/345 ,  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.

公开(公告)号：US20210310861A1

公开(公告)日：2021-10-07

申请号：US17220761

申请日：2021-04-01

Applicant: PROPHESEE

Inventor： DANIEL MATOLIN ,  Denis BOURKE ,  Christian BOUVIER

IPC: G01J1/42 ,  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.

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.

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

Inventor： Thomas FINATEU ,  Bernabé LINARES BARRANCO ,  Teresa SERRANO GOTARREDONA ,  Christoph POSCH

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.

公开(公告)号：US20250078508A1

公开(公告)日：2025-03-06

申请号：US18457536

申请日：2023-08-29

Applicant: PROPHESEE

Inventor： Nicolas MARTIN

IPC: G06V20/40 ,  G06V20/52

Abstract: A method produces a compressed sequence of events stored in a memory, originating from an event-based camera, the sequence comprising a first run-length code representing timestamps of the sequence of events; and subsequent compressed codes including one of: (i) a second run-length code representing first coordinates of the sequence of events, at least one dictionary code representing second coordinates of the sequence of events, and data representing polarities of the sequence of events; (ii) a second run-length code representing first coordinates of the sequence of events, a number of bit-packed fields, each representing a second coordinate and polarity pair of the sequence of events; or (iii) a number of bit-packed fields, each representing a first and second coordinate and polarity triplet of the sequence of events.

公开(公告)号：US12219254B2

公开(公告)日：2025-02-04

申请号：US18003302

申请日：2021-06-23

Applicant: Prophesee

Inventor： Daniele Perrone ,  Thibault Leblanc ,  Sylvain Brohan

IPC: H04N23/68 ,  H04N23/80 ,  H04N23/83

Abstract: An image enhancement method, comprising: obtaining a reference image frame from of a scene, by a frame-based sensor, wherein the reference image contains artifacts and has an exposure duration; obtaining a stream of events, by an event-based sensor which is synchronized with the frame-based sensor, at least during the exposure duration, wherein the events encode brightness changes of the scene corresponding to the reference image; and deriving a corrected image frame without the artifacts from the reference image frame using the stream of events.

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

IPC: H04N25/47 ,  H04N25/42

CPC classification number: H04N25/47 ,  H04N25/42

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.

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.

公开(公告)号：US12000692B2

公开(公告)日：2024-06-04

申请号：US17310753

申请日：2020-02-21

Applicant: PROPHESEE

Inventor： Guillaume Chican ,  Manuele Brambilla ,  Xavier Lagorce

IPC: G06T15/00 ,  G01B11/25 ,  G06F18/23 ,  G06T7/521 ,  G06V10/145 ,  G06V10/60 ,  G06V10/762 ,  G06V20/64

CPC classification number: G01B11/2513 ,  G06F18/23 ,  G06T7/521 ,  G06V10/145 ,  G06V10/60 ,  G06V10/762 ,  G06V20/64 ,  G06T2207/10016

Abstract: The present disclosure generally relates to systems and methods for three-dimensional image sensing. More specifically, and without limitation, this disclosure relates to systems and methods for detecting three-dimensional images, and using asynchronous image sensors for detecting the same. In one implementation, at least one processor determines a plurality of patterns associated with a plurality of electromagnetic pulses emitted by a projector onto a scene; receives, from an image sensor, one or more first signals based on reflections caused by the plurality of electromagnetic pulses; detects one or more first events corresponding to one or more first pixels of the image sensor based on the received signals; based on the one or more first events, initializes one or more first events more state machines; receives, from the image sensor, one or more second signals corresponding to the reflections; detects one or more second events corresponding to one or more second pixels of the image sensor based on the received signals; determines candidates for connecting the one or more state machines more second events to the one or more first events; and determines three-dimensional points for the one or more first pixels and the one or more second pixels based on the candidates and the one or more state machines.

公开(公告)号：US11995878B2

公开(公告)日：2024-05-28

申请号：US17427033

申请日：2020-01-29

Applicant: PROPHESEE

Inventor： Xavier Lagorce

IPC: G06V20/40 ,  G06F16/583 ,  G06T7/269 ,  G06T7/50 ,  G06V10/20 ,  G06V10/26 ,  G06V10/762 ,  G06V20/70

CPC classification number: G06V10/267 ,  G06F16/583 ,  G06T7/269 ,  G06T7/50 ,  G06V10/20 ,  G06V10/762 ,  G06V20/70 ,  G06V20/44

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.