Circular Calibration of Depth Extraction in Stereo Configuration

Abstract: Lens distortion is defined as departure from rectilinear projection of an imaging system which affects the accuracy of almost all vision applications. This work addresses the problem of distortion with investigating the effects of camera’s view angle and spherical nature of lens on image, and then derives a closed-form solution for the correction of distorted pixel's angle in image according to geometric shape of lens. We first propose technique that explores the linear relation between lens and charge-coupled device in intrinsic environment of camera, through analysis of pixel’s angle in field of view. Second technique for depth extraction through linear transformation in rectangular configuration is achieved by considering the camera’s background in field of view which provides optimal results in closed environment. As the object moves away from the center of image in image plane, depth accuracy starts to deteriorate due to radial distortion. To rectify this problem, we finally purpose circular calibration methodology which addresses this inaccuracy and accommodate radial distortion to achieve optimal results up to 98%, in great depth with very large baseline. Results show the improvement over established stereo imaging techniques in depth extraction where the presented considerations are not observed. This methodology ensures high accuracy of triangulated depth with very large base line.

Zulfiqar Ibrahim, Zulfiqar Ali Bangash and Muhammad Zeeshan. “Circular Calibration of Depth Extraction in Stereo Configuration”. International Journal of Advanced Computer Science and Applications (IJACSA) 9.3 (2018). http://dx.doi.org/10.14569/IJACSA.2018.090336

@article{Ibrahim2018,
title = {Circular Calibration of Depth Extraction in Stereo Configuration},
journal = {International Journal of Advanced Computer Science and Applications},
doi = {10.14569/IJACSA.2018.090336},
url = {http://dx.doi.org/10.14569/IJACSA.2018.090336},
year = {2018},
publisher = {The Science and Information Organization},
volume = {9},
number = {3},
author = {Zulfiqar Ibrahim and Zulfiqar Ali Bangash and Muhammad Zeeshan}
}