Volume 9 Issue 6
Nov.  2016
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ZHANG Shao-yang, HOU Xu-yang, CUI Hua, GAO Xiao-mei. Depth image acquisition using laser speckle[J]. Chinese Optics, 2016, 9(6): 633-641. doi: 10.3788/CO.20160906.0633
Citation: ZHANG Shao-yang, HOU Xu-yang, CUI Hua, GAO Xiao-mei. Depth image acquisition using laser speckle[J]. Chinese Optics, 2016, 9(6): 633-641. doi: 10.3788/CO.20160906.0633

Depth image acquisition using laser speckle

doi: 10.3788/CO.20160906.0633
Funds:

Supported by Basic Scientific Research Projects(Natural Sciences) of Central Universities of China No.310824152009

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  • Corresponding author: E-mail:zhsy@chd.edu.cn
  • Received Date: 22 Jun 2016
  • Rev Recd Date: 18 Jul 2016
  • Publish Date: 01 Dec 2016
  • Compared with the ordinary 2D gray and color images, 3D information of target can be obtained by depth image, making the visual identification and human-computer interaction more intelligent. There is no open and real-time method to obtain high quality depth image at low cost at home and abroad. In this paper, based on the principle research on obtaining the depth image by laser speckle, a way to obtain wide range of depth image is presented by laser speckle and the method of template matching. Firstly, the feasibility of the method of template matching is proved in this paper. Then, the formula of depth image is calculated and verified from both theory and experiments. After that, the process of recovering depth image is described in detail, including pretreatment of speckle image and the process of block matching. Finally, the experimental data obtained by this template matching method are given. The experimental results show that the precision can reach 5 mm when the objects is 50 cm far from the camera and 5 cm when the object is 200 cm far from the camera by using the method proposed in this paper, which can satisfy the reguirements of most indoor objects' recognition.

     

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