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437 results on '"Tian, Jindong"'

161. 高次谐波锁模飞秒掺镱光纤激光器的噪声情况

Author

柏汉泽 Bai Hanze, 钟艺峰 Zhong Yifeng, 任炽明 Ren Chiming, 黄俊杰 Huang Junjie, 田劲东 Tian Jindong, 熊德平 Xiong Deping, and 孙敬华 Sun Jinghua

Subjects
Space and Planetary Science, Aerospace Engineering, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics
Published
2022
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163. Three-dimensional vision from a multisensing mechanism

Author

Tian, Jindong and Peng, Xiang

Subjects
Computer-generated environments -- Analysis, Computer simulation -- Analysis, Coding theory -- Analysis, Three dimensional vision -- Analysis, Astronomy, Physics
Abstract

An approach for sensing a three-dimensional (3D) object surface with an arbitrary geometric shape is presented. Combining two different 3D sensing mechanisms, point-array encoding based on affine transformation and fringe encoding based on phase mapping, we construct a mathematic model for 3D vision in which the point-array encoding is initially applied to determine the fringe orders to create a control-vertex mesh with absolute coordinate values in 3D space. Then phase evaluation and phase unwrapping for fringe decoding is performed under the guidance of control-vertex mesh, leading to an absolute phase map and the corresponding range image of the test object. The computer simulations and experimental results are presented to demonstrate the theoretical prediction. OCIS codes: 150.6910, 120.6650, 120.5050.

Published
2006

167. Three-dimensional digital imaging based on shifted point-array encoding

Author

Tian, Jindong and Peng, Xiang

Subjects
Imaging systems -- Research, Optics -- Research, Astronomy, Physics
Abstract

An approach to three-dimensional (3D) imaging based on shifted point-array encoding is presented. A kind of point-array structure light is projected sequentially onto the reference plane and onto the object surface to be tested and thus forms a pair of point-array images. A mathematical model is established to formulize the imaging process with the pair of point arrays. This formulation allows for a description of the relationship between the range image of the object surface and the lateral displacement of each point in the point-array image. Based on this model, one can reconstruct each 3D range image point by computing the lateral displacement of the corresponding point on the two point-array images. The encoded point array can be shifted digitally along both the lateral and the longitudinal directions step by step to achieve high spatial resolution. Experimental results show good agreement with the theoretical predictions. This method is applicable for implementing 3D imaging of object surfaces with complex topology or large height discontinuities. OCIS codes: 150.6910, 120.6650.

Published
2005

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