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

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United States of America Patent

PATENT NO 11736832
APP PUB NO 20220321819A1
SERIAL NO

17847132

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Abstract

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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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Patent Owner(s)

  • SAMSUNG ELECTRONICS CO., LTD

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ovsiannikov, Ilia Studio City, US 132 1613
Wang, Yibing Michelle Temple City, US 125 895

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