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Proceedings Paper

Using different interpolation techniques in unwrapping the distorted images from panoramic annular lens camera
Author(s): Guo Yu; Lingjin Fu; Jian Bai
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Paper Abstract

The camera using panoramic annular lens (PAL) can capture the surrounding scene in a view of 360° without any scanning component. Due to severe distortions, the image formed by PAL must be unwrapped into a perspective-view image in order to get consistency with the human's visual custom. However the unfilled pixels would probably exist after unwrapping as a result of the non-uniform resolution in the PAL image, hence the interpolation should be employed in the phase of the forward projection unwrapping. We also evaluated the performance of several interpolation techniques for unwrapping the PAL image on a series of frequency-patterned images as a simulation by using three image quality indexes: MSE, SSIM and S-CIELAB. The experiment result revealed that those interpolation methods had better capability for the low frequent PAL images. The Bicubic, Ferguson and Newton interpolations performed relatively better at higher frequencies, while Bilinear and Bezier could achieve better result at lower frequency. Besides, the Nearest method had poorest performance in general and the Ferguson interpolation was excellent in both high and low frequencies.

Paper Details

Date Published: 9 November 2010
PDF: 8 pages
Proc. SPIE 7849, Optical Design and Testing IV, 78491X (9 November 2010); doi: 10.1117/12.869915
Show Author Affiliations
Guo Yu, Zhejiang Univ. (China)
Lingjin Fu, Zhejiang Univ. (China)
Jian Bai, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 7849:
Optical Design and Testing IV
Yongtian Wang; Julie Bentley; Chunlei Du; Kimio Tatsuno; Hendrik P. Urbach, Editor(s)

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