Results 331 to 340 of about 1,632,188 (371)
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Optical Engineering, 1966
The Underwater Camera Calibrator is a precision instrument that provides a known angular array of collimator targets to be photographed by a camera under test. The images of the targets are then read and measured to yield the necessary data for the determination of focal length, location of principal point, distortion, and resolution.
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The Underwater Camera Calibrator is a precision instrument that provides a known angular array of collimator targets to be photographed by a camera under test. The images of the targets are then read and measured to yield the necessary data for the determination of focal length, location of principal point, distortion, and resolution.
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A Robust and Rapid Camera Calibration Method by One Captured Image
IEEE Transactions on Instrumentation and Measurement, 2019A robust and rapid camera calibration method is essential in vision measurement. This paper proposes a camera calibration method using a 2.5-D coding target that requires just a single captured image and is capable of identifying the intrinsic and ...
Jin Zhang +5 more
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2000
This article deals with optical laws that must be considered when using underwater cameras. Both theoretical and experimental point of views are described, and it is shown that relationships between air and water calibration can be found.
J. M. Lavest, G. Rives, J. T. Lapresté
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This article deals with optical laws that must be considered when using underwater cameras. Both theoretical and experimental point of views are described, and it is shown that relationships between air and water calibration can be found.
J. M. Lavest, G. Rives, J. T. Lapresté
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Automatic targetless LiDAR–camera calibration: a survey
Artificial Intelligence Review, 2022Xingchen Li +5 more
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An effective method for camera calibration in defocus scene with circular gratings
Optics and lasers in engineering, 2019Conventional camera calibrations with circular patterns always require sharp target images and thus fail if the images are blurred. In this paper, we present an effective calibration approach using three circular gratings, which can be employed in ...
Bolin Cai +7 more
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Camera calibration method based on optimal polarization angle
Optics and lasers in engineering, 2019The accurate estimation of camera internal and external parameters is one of the keys to high-precision camera calibration. At present, the mainstream Zhang's calibration method requires the use of a checkerboard to achieve high-precision calibration ...
Zhenmin Zhu +3 more
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Multi-camera calibration method based on a multi-plane stereo target.
Applied Optics, 2019Machine vision techniques, including camera calibration methods, are of great importance for the development of vision-based measurements. However, in multi-camera calibration methods, rapidly constructing accurate geometric relationships among different
Jin Zhang +5 more
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Empire Survey Review, 1938
AbstractAccidents will happen and the surveyor is therefore sometimes required to do the best he can with photographs taken with an uncalibrated camera which is not available for subsequent calibration. This note outlines a method by which an approximate principal distance can be obtained for high oblique air photographs from points appearing in the ...
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AbstractAccidents will happen and the surveyor is therefore sometimes required to do the best he can with photographs taken with an uncalibrated camera which is not available for subsequent calibration. This note outlines a method by which an approximate principal distance can be obtained for high oblique air photographs from points appearing in the ...
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Visual calibration of reseau cameras
Photogrammetria, 1978Abstract This paper introduces a collinearity model applied to cameras with a recessed registerglas reseau. After a description of goniometers used for the calibration of aerial cameras at Wild Heerbrugg Ltd. and Carl Zeiss Oberkochen, and their standard calibration procedures, the calibration of two such reseau cameras, based on this collinearity ...
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