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On improved calibration method for the catadioptric omnidirectional vision with a single viewpoint

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Abstract

The single viewpoint constraint is a principal optical characteristic for most catadioptric omnidirectional vision. Single viewpoint catadioptric omnidirectional vision is very useful because it allows the generation of geometrically correct perspective images from one omnidirectional image. Therefore precise calibration for single viewpoint constraint is needed during system assembling. However, in most image detection based calibration methods, the nonlinear optical distortion brought by lens is often neglected. Hence the calibration precision is poor. In this paper, a new calibration method of single viewpoint constraint for the catadioptric omni-directional vision is proposed. Firstly, an image correction algorithm is obtained by training a neural network. Then, according to characteristics of the space circular perspective projection, the corrected image of the mirror boundary is used to estimate its position and attitude relative to the camera to guide the calibration. Since the estimate is conducted based on actual imaging model rather than the simplified model, the estimate error is largely reduced, and the calibration accuracy is significantly improved. Experiments are conducted on simulated images and real images to show the accuracy and the effectiveness of the proposed method.

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Abbreviations

SVC:

Single viewpoint constraint

COV:

Catadioptric omnidirectional vision

NN:

Neural network

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Authors and Affiliations

  1. College of Automation, Harbin Engineering University, Harbin, 150001, China

    Fan Zhang & Qi-dan Zhu

Authors
  1. Fan Zhang
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  2. Qi-dan Zhu
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Correspondence to Fan Zhang.

Additional information

This work is supported by National Nature Science Foundation under Grant 60875025

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Zhang, F., Zhu, Qd. On improved calibration method for the catadioptric omnidirectional vision with a single viewpoint. Multimed Tools Appl 52, 77–89 (2011). https://doi.org/10.1007/s11042-009-0453-y

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