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Proceedings Paper

Study on depth of field of wavefront coding imaging system
Author(s): Chao Pan; Jiabi Chen; Dawei Zhang; Songlin Zhuang
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Paper Abstract

The wavefront coding imaging technology is a good approach of extending DOF (depth of field) of imaging optical system with an identical exit pupil. A phase mask being introduced in the exit pupil of the optical system makes the MTF of the system to be defocus-independent. As a result, the DOF of the system is extended without a loss of resolution. How much this technique can extend the DOF of optical system? It was shown by experimental and simulation results of some papers that a wavefront coding imaging system can make the DOF raise an order of magnitude. However, there is no theoretical analysis of DOF extension of wavefront coding technique up to now. In this paper, a special condition under which MTF of wavefront coding system is defocus-independent is discovered by investigating the OTF of the wavefront coding imaging system with cubic phase mask. Based on the condition, an expression of the DOF of wavefront coding imaging system is obtained. The conclusion is verified by the simulation results.

Paper Details

Date Published: 15 September 2008
PDF: 8 pages
Proc. SPIE 7073, Applications of Digital Image Processing XXXI, 70732C (15 September 2008); doi: 10.1117/12.794682
Show Author Affiliations
Chao Pan, Univ. of Shanghai for Science and Technology (China)
Huangshi Institute of Technology (China)
Jiabi Chen, Univ. of Shanghai for Science and Technology (China)
Dawei Zhang, Univ. of Shanghai for Science and Technology (China)
Songlin Zhuang, Univ. of Shanghai for Science and Technology (China)


Published in SPIE Proceedings Vol. 7073:
Applications of Digital Image Processing XXXI
Andrew G. Tescher, Editor(s)

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