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Optical Engineering • Open Access

Efficient active depth sensing by laser speckle projection system

Paper Abstract

An active depth sensing approach by laser speckle projection system is proposed. After capturing the speckle pattern with an infrared digital camera, we extract the pure speckle pattern using a direct-global separation method. Then the pure speckles are represented by Census binary features. By evaluating the matching cost and uniqueness between the real-time image and the reference image, robust correspondences are selected as support points. After that, we build a disparity grid and propose a generative graphical model to compute disparities. An iterative approach is designed to propagate the messages between blocks and update the model. Finally, a dense depth map can be obtained by subpixel interpolation and transformation. The experimental evaluations demonstrate the effectiveness and efficiency of our approach.

Paper Details

Date Published: 20 January 2014
PDF: 10 pages
Opt. Eng. 53(1) 013105 doi: 10.1117/1.OE.53.1.013105
Published in: Optical Engineering Volume 53, Issue 1
Show Author Affiliations
Xuanwu Yin, Tsinghua Univ. (China)
Guijin Wang, Tsinghua Univ. (China)
Chenbo Shi, Tsinghua Univ. (China)
Qingmin Liao, Tsinghua Univ. (China)


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