System and method for histogram binning for depth detection

    公开(公告)号:US12032065B2

    公开(公告)日:2024-07-09

    申请号:US16940237

    申请日:2020-07-27

    Abstract: Provided is a depth detection system and method of histogram binning for depth detection. The depth detection system includes a light source configured to emit a light pulse toward an object, an optical sensor configured to detect the light pulse reflecting off the object, the optical sensor including a first sensing pixel configured to detect the light pulse for a first event count according to the light pulse reflecting off the object, and a second sensing pixel configured to detect the light pulse for a second event count according to the light pulse reflecting off the object, and a processing circuit configured to determine a first aggregated histogram corresponding to the first sensing pixel based on the first event count and the second event count and determine a first peak of the first aggregated histogram to determine a first time of flight associated with the first sensing pixel.

    Readout architecture for FMCW LiDAR

    公开(公告)号:US11988779B2

    公开(公告)日:2024-05-21

    申请号:US17011813

    申请日:2020-09-03

    CPC classification number: G01S7/4915 G01S7/4816 G01S7/4817 G01S17/06 G01S17/58

    Abstract: Provided is a readout integrated circuit of a FMCW LiDAR system includes a transimpedance amplifier to receive an optical signal of optical mixer output from balanced PIN photo diode, convert the received optical signal into a current signal including a mixed signal of high and low frequencies, and convert the current signal into a voltage signal including a low frequency sinusoidal waveform, a comparator to receive the voltage signal, and generate a pulse signal from the voltage signal, a primary counter to receive a primary signal corresponding to the pulse signal, and count a number of pulses to generate primary counter data, a reference counter to receive a reference signal, and count a number of pulses to generate reference counter data, and an arithmetic logic unit to receive the primary and reference counter data, and calculate depth information corresponding to a distance of a target.

    High contrast structured light patterns for QIS sensors

    公开(公告)号:US11525671B2

    公开(公告)日:2022-12-13

    申请号:US17374982

    申请日:2021-07-13

    Abstract: A structured-light pattern for a structured-light system includes a base light pattern that includes a row of a plurality of sub-patterns extending in a first direction. Each sub-pattern is adjacent to at least one other sub-pattern, and each sub-pattern is different from each other sub-pattern. Each sub-pattern includes a first number of portions in a sub-row and a second number of portions in a sub-column. Each sub-row extends in the first direction and each sub-column extends in a second direction that is substantially orthogonal to the first direction. Each portion may be a first-type portion or a second-type portion. A size of a first-type portion is larger in the first direction and in the second direction than a size of a second-type portion in the first direction and in the second direction. In one embodiment, a first-type portion is a black portion and the second-type portion is a white portion.

    Three-dimensional camera system
    69.
    发明授权

    公开(公告)号:US11443447B2

    公开(公告)日:2022-09-13

    申请号:US16894705

    申请日:2020-06-05

    Abstract: A camera system. In some embodiments, the camera system includes a first laser, a camera, and a processing circuit connected to the first laser and to the camera. The first laser may be steerable, and the camera may include a pixel including a photodetector and a pixel circuit, the pixel circuit including a first time-measuring circuit.

    Timestamp calibration of the 3D camera with epipolar line laser point scanning

    公开(公告)号:US11431938B2

    公开(公告)日:2022-08-30

    申请号:US17093632

    申请日:2020-11-09

    Abstract: Using the same image sensor to capture a two-dimensional (2D) image and three-dimensional (3D) depth measurements for a 3D object. A laser point-scans the surface of the object with light spots, which are detected by a pixel array in the image sensor to generate the 3D depth profile of the object using triangulation. Each row of pixels in the pixel array forms an epipolar line of the corresponding laser scan line. Timestamping provides a correspondence between the pixel location of a captured light spot and the respective scan angle of the laser to remove any ambiguity in triangulation. An Analog-to-Digital Converter (ADC) in the image sensor operates as a Time-to-Digital (TDC) converter to generate timestamps. A timestamp calibration circuit is provided on-board to record the propagation delay of each column of pixels in the pixel array and to provide necessary corrections to the timestamp values generated during 3D depth measurements.

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