Mr. Ming-Lei Wang Profile

Ming-Lei Wang

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Proceedings Article | 12 April 2023 Paper

Over-the-horizon camera calibration on smartphones with planar mirror reflections

Yong-Liang Xiao, Ming-Lei Wang

Proceedings Volume 12565, 1256513 (2023) https://doi.org/10.1117/12.2661983

KEYWORDS: Cameras, Calibration, Mirrors, LCDs, Imaging systems, Image processing, 3D image processing, 3D modeling, Photography, 3D acquisition

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To address the camera calibration problems on multi-cameras photography without any common field of views (FOVs), an over-the-horizon camera calibration on smartphones with planar mirror reflections is proposed. The liquid crystal display (LCD) target is placed suitably in the FOV of front cameras assembled on smartphones, and the chessboard images are captured from different views to obtain the intrinsic and extrinsic parameters for the front cameras. Then the target is reflected into the FOV of rear cameras with planar mirror reflections, which present parallel characteristics with respect to the front cameras, and then the absolute poses between the LCD target and the rear cameras are estimated. The over-the-horizon camera calibration experiments on a single and double smartphones show that the avenue of planar mirror reflections is simple and delicate. The Kappa’s poses between the front and the rear cameras are exhibited in the three-dimensional diagrams along with the mirrored images, in which the poses transfer between a series of cameras and a pubic shared target are implemented. The method behaves significantly potentials to resolve some intractable problems on a multi-camera holography without any common FOVs.

Proceedings Article | 4 April 2023 Paper

Over-the-horizon camera calibration on smartphones with planar mirror reflections

Yong-Liang Xiao, Ming-Lei Wang

Proceedings Volume 12617, 126171P (2023) https://doi.org/10.1117/12.2664549

KEYWORDS: Cameras, Calibration, Mirrors, LCDs, Imaging systems, Image processing, Photography

Read Abstract +

To address the camera calibration problems on multi-camera photography without any common field of views (FOVs), an over-the-horizon camera calibration method on smartphones with planar mirror reflections is proposed. The liquid crystal display (LCD) target is placed suitably in the FOV of front cameras assembled on smartphones, and the chessboard images are captured from different views to obtain the intrinsic and extrinsic parameters for the front cameras. Then the target is reflected into the FOVs of rear cameras with planar mirror reflections, which presents parallel characteristics with respect to the front cameras, and then the absolute poses among the LCD target and the rear cameras are estimated. The over-the-horizon camera calibration experiments on a single and double smartphone show that the avenue of planar mirror reflections is simple and delicate. The Kappa’s poses among the front and the rear cameras are exhibited in the three-dimensional diagrams along with the mirrored images, in which the poses transfer among a series of cameras and a public shared target are implemented. The method behaves significantly potentials to resolve some intractable problems on a multi-camera holography without any common FOVs.

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