Division model‐based distortion correction method for head‐mounted displays

Xue, Xiao; Zhang, Lin; Lin, Xiao; Zang, Jiawei; Tan, Xiaodi

doi:10.1002/jsid.754

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…Algorithm 1 in the traditional lookup table design technique would ideally be assumed that optical software can directly offer the original data feature points for constructing geometric models [10], [11]. However, in practice, it has been discovered that the ideal image feature points offered by optical software are not the proper feature points and cannot be used directly.…”

Section: The Design Methods Of the Lookup Table A Traditional Methods...mentioning

confidence: 99%

The Design and Implementation of the Lookup Table in Distortion Correction for the Optical System

2023

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Image geometric distortion is common in a large field of view optical system. It becomes a technical difficulty for high distortion rate optical systems and high resolution image geometric distortion correction. But, a crucial step in distortion correction is figuring out how to precisely obtain the index coordinates and correction parameters, otherwise known as the lookup table. In this paper, the problems in the traditional lookup table method are analyzed, and an improved lookup table method is proposed. The method is based on the traditional lookup table method with the addition of removing the wrong data of position coordinates in the correction image feature points, calculating the ideal image feature point position coordinates, handling the index coordinate out-of-bounds, and adjusting the output order of index coordinates and correction parameters. The experimental results show that the improved design method is feasible, and improves the accuracy of the correction image, compared with the traditional lookup table, the root mean square error is reduced by 93%, and the average accuracy of the fitted position over the full field of view is reduced by 51.9%, and the maximum deviation is only 0.2917%. For the correction of the large field of view optical display devices, it offers good correction effects.

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Section: The Design Methods Of the Lookup Table A Traditional Methods...mentioning

confidence: 99%

The Design and Implementation of the Lookup Table in Distortion Correction for the Optical System

2023

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“…Besides, distortion is also caused in fabrication and assembly, especially by untraditional optical components. Thus, the correction methods for distortion of conventional optical system is not applicable anymore [18]. Simple methods for correcting these distortions are essential.…”

Section: Introductionmentioning

confidence: 99%

46.5: Computational Correction Method for Optical Distortion in Eyewear Displays

Xue¹,

Zhang²,

Lin

et al. 2019

Symp Digest of Tech Papers

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In this paper, we give a brief introduction of eyewear displays for virtual reality (VR) and augmented reality (AR), and present two computational methods that not only can be applied to traditional eyewear displays but systems with asymmetrical and nonlinear distortion as well. The methods combine image segmentation with linear approximation to correct the optical distortion. Through these approaches, pixel‐mapping table for generating pre‐distorted image can be established simply and quickly. The feasibility has been verified by experiments. These distortion correction methods for eyewear displays can achieve a sufficient accuracy, avoid a great deal of numerical calculations and enable real‐time correction.

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Distortion correction and image registration of ultralarge field of view near-eye display device

et al. 2020

Appl. Opt.

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A large field of view (FOV) is one dominant factor in improving the immersion of head-mounted displays (HMDs), and optical splicing is a mainstream solution to achieve it. For a display device with a large FOV, the camera may not be able to obtain the full-frame distorted image in a single shot. This paper proposes a computational correction method to achieve distortion correction for these devices. The method uses homography transformation to transform subsampled images to the same coordinate system for stitching, then performs the subregional Bézier patch fitting, which adequately describes the complex nonlinear distortion on the stitched image. Finally, the mapping table can be utilized for subsystem correction. Experiment results show that the method reduces the maximum standard deviation of the line fitting error from about 12 pixels to less than 1 pixel, effectively eliminating the distortion. For optical spliced HMDs, this paper proposes an image registration scheme that modifies the mapping table aforementioned by feedback adjustment to remove the misalignment of subsystem imaging results at the seam. Experiment results show that the method can ensure a good stitching effect.

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Division model‐based distortion correction method for head‐mounted displays

Cited by 3 publications

References 28 publications

The Design and Implementation of the Lookup Table in Distortion Correction for the Optical System

The Design and Implementation of the Lookup Table in Distortion Correction for the Optical System

46.5: Computational Correction Method for Optical Distortion in Eyewear Displays

Distortion correction and image registration of ultralarge field of view near-eye display device

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