Range enhancement of a semi-flash lidar system using a sparse VCSEL array and depth upsampling

Jihoon Park; Junho Choi; Changmo Jeong; Hoonil Jeong; Dong ju Jang; Chan M. Lim; Sangwoo Park; Dong Kyu Kim; Junhyun Cho; Yong Yi Lee

doi:10.1117/12.2632605

3 October 2022 Range enhancement of a semi-flash lidar system using a sparse VCSEL array and depth upsampling

Jihoon Park, Junho Choi, Changmo Jeong, Hoonil Jeong, Dong ju Jang, Chan M. Lim, Sangwoo Park, Dong Kyu Kim, Junhyun Cho, Yong Yi Lee

Author Affiliations +

Proceedings Volume 12226, Applications of Digital Image Processing XLV; 122260X (2022) https://doi.org/10.1117/12.2632605
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

3D flash lidar has no moving part and can provide high-resolution depth information, so they are attracting attention in development of solid-state lidar system. However, the limited detecting range is key challenge because a single diffused laser source has to cover the whole target area while satisfying the laser-safety requirements. In this paper, we propose a semi-flash lidar system to increase the detecting range while providing high-resolution and wide field-of-view. To increase the peak power of the individual lasers under laser-safety constraint, we design a customized VCSEL array that forming a sparse 2D laser array. We also propose a depth upsampling method to recover the empty pixels in a SPAD detector array which are caused by sparsely distributed laser beam. For robust depth reconstruction, a joint trilateral filter that exploits the ambient light information and structural information of the VCSEL array are presented. Using a hardware prototype, we show the degree of the range enhancement and fidelity of the depth upsampling results under a various environment.

Conference Presentation

Citation Download Citation

Jihoon Park, Junho Choi, Changmo Jeong, Hoonil Jeong, Dong ju Jang, Chan M. Lim, Sangwoo Park, Dong Kyu Kim, Junhyun Cho, and Yong Yi Lee "Range enhancement of a semi-flash lidar system using a sparse VCSEL array and depth upsampling", Proc. SPIE 12226, Applications of Digital Image Processing XLV, 122260X (3 October 2022); https://doi.org/10.1117/12.2632605

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