NDLI: Corrected unwrapping method based on the tangential and radial distortion centre for the panoramic annular image

Content Provider	IET Digital Library
Author	Wang, Xinzheng Bu, Xiongzhu Yang, Bo Li, Guijuan Yu, Jing
Abstract	A novel corrected unwrapping method is proposed for panoramic annular images based on the catadioptric panoramic imaging system. The method is comprised of four key steps. Firstly, the distortion centre parameters on the panoramic annular image are determined, including the tangential distortion centre by using the least-square fitting (LSF) method and the radial distortion centre by extracting feature points. Secondly, the affine transformation relation between panoramic annular image and cylindrical panoramic image is constructed based on the centre parameters and the geometric properties of panoramic image. Then the annular image pixels are replicated into the cylindrical panoramic image by means of the bilinear interpolation. Finally, the frame aspect ratio for the final image unwrapping is corrected. The motivation for developing this technique is to solve the distortion problem from the centre deviation, and ultimately to promotes its adoption in pipe non-destructive testing systems. Experimental results have proved the feasibility, validity and higher accuracy of the unwrapping method.
Starting Page	127
Ending Page	133
Page Count	7
ISSN	17519659
Volume Number	9
e-ISSN	17519667
Issue Number	Issue 2, Feb (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/9/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2014.0301
Journal	IET Image Processing
Publisher Date	2014-08-05
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Affine Transforms Afflne Transformation Relation Annular Image Pixel Bilinear Interpolation Catadioptric Panoramic Imaging System Centre Deviation Computer Vision And Image Processing Technique Corrected Image Unwrapping Method Cylindrical Panoramic Image Distortion Feature Extraction Feature Point Extraction Frame Aspect Ratio Geometric Property Image Recognition Integral Transforms in Numerical Analysis Interpolation Interpolation And Function Approximation Least Squares Approximation Least-square Fitting Method LSF Method Numerical Analysis Panoramic Annular Image Pipe Nondestructive Testing System Radial Distortion Centre Parameter Tangential Distortion Centre Parameter
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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