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Proceedings Paper

Calculation and hue mapping of AoP in polarization imaging
Author(s): Bin Feng; Rongli Guo; Faqiang Zhang; Feng Zhao; Yue Dong
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Paper Abstract

The value range of AoP (angle of polarization) is physically limited to [0, π]. However, for most programing languages such as Matlab and C/C++, the range of inverse tangent function is commonly limited to [-π/2, -π/2]. Therefore, this paper derives a practical formula for AoP calculation based on the inverse tangent function of common programming languages. Because AoP is a periodical function, the conventional gray image cannot effectively display the AoP levels. The hue component of HSV (hue, saturation and value) color space is also periodical. Therefore, this paper maps the AoP to hue component and then transforms HSV space to RGB space. Different AoP reference orientations will produce different false color displays. In our experiment, polarization images of a fishbowl scene are captured by a DoFP (division of focal plane) polarization camera, and a sequence of false RGB images with different reference orientations are produced.

Paper Details

Date Published: 24 January 2019
PDF: 6 pages
Proc. SPIE 11052, Third International Conference on Photonics and Optical Engineering, 110521V (24 January 2019); doi: 10.1117/12.2523643
Show Author Affiliations
Bin Feng, Northwestern Polytechnical Univ. (China)
Xi’an Technological Univ. (China)
Rongli Guo, Xi'an Technological Univ. (China)
Faqiang Zhang, Xi'an Technological Univ. (China)
Feng Zhao, Xi'an Univ. of Posts and Telecommunications (China)
Yue Dong, Xi'an Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 11052:
Third International Conference on Photonics and Optical Engineering
Ailing Tian, Editor(s)

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