Kevin A Zhou

US Patent:

20210333396, Oct 28, 2021

Filed:

Apr 23, 2021

Appl. No.:

17/238521

Inventors:

- Durham NC, US
Ruobing QIAN - Durham NC, US
Kevin ZHOU - Durham NC, US

International Classification:

G01S 17/42
G02B 5/18
G02B 27/30
G01S 17/89
G06T 7/521
G06T 5/00
G06T 5/20

Abstract:

A 3D sensing depth camera involves a time-frequency multiplexed frequency-modulated continuous wave (FMCW) LiDAR technique. A sample arm of such a system for 3D depth sensing includes a scanner for beam scanning in a first axis and a diffractive optical element for spectrally encoded scanning along a second axis. The sample arm can further include beam shaping optics such as a collimator and a lens. Processing of an interferogram comprising depth information at a different position along the second axis for each frequency sweep of the light source involves applying a windowed spectral estimator at a particular spectral window size with zero-padding and according to a specified lateral sampling approach.

US Patent:

20200340798, Oct 29, 2020

Filed:

Jan 29, 2019

Appl. No.:

16/955754

Inventors:

- Durham NC, US
Ruobing QIAN - Durham NC, US
Kevin ZHOU - Durham NC, US

International Classification:

G01B 9/02
G01N 21/47

Abstract:

Systems and methods for imaging based on multiple cross-sectional images acquired at different angles are disclosed. According to an aspect, multiple cross-sectional images of an object are acquired at different angles. The method also includes registering the acquired cross-sectional images. Further, the method includes reconstructing an enhanced resolution image of the object based on the registered images. As a result of registering the images, a distortion map is generated that is coregistered with the high-resolution image. The method also includes displaying an image of the object based on the enhanced resolution image and the distortion map.