Calibrating an Automatic Zoom Camera With Moving Least Squares

Sarkis, Michel; Senft, C.T.; Diepold, Klaus

doi:10.1109/tase.2009.2021350

Cited by 18 publications

(14 citation statements)

References 35 publications

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“…And a large number of studies have already focused on modeling the variations of intrinsic parameters associated with lens settings (Agapito et al, 2001;Alvarez et al, 2012;Burner, 1995;Fraser and Al-Ajlouni, 2006;Fraser et al, 2012;Kim et al, 2010;Li and Lavest, 1996;Sanz-Ablanedo et al, 2012;Sarkis et al, 2007Sarkis et al, , 2009Tarabanis et al, 1992;Wiley and Wong, 1995;Willson, 1994;Wu et al, 2013). On the basis of existing studies, an extended Brown self-calibration model is used in our calibration method:…”

Section: Empirical Zoom/focus Modelsmentioning

confidence: 99%

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Zoom lens calibration with zoom- and focus-related intrinsic parameters applied to bundle adjustment

Zheng

Huang

2015

ISPRS Journal of Photogrammetry and Remote Sensing

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Section: Empirical Zoom/focus Modelsmentioning

confidence: 99%

“…Second, (Sarkis et al, 2009) calibrated zoom lenses by fitting the continuous local functions of intrinsic parameters with respect to zoom and focus settings on the basis of the moving least square scheme. This method first completes separate monofocal calibrations at some scattered zoom and focus points.…”

Section: Introductionmentioning

confidence: 99%

Zoom lens calibration with zoom- and focus-related intrinsic parameters applied to bundle adjustment

Zheng

Huang

2015

ISPRS Journal of Photogrammetry and Remote Sensing

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“…Efforts have previously been made in the calibration of various digital-zoom lens devices, such as computer controllable lens systems [18,19], single-lens reflex cameras [16,20], still video cameras [21,22], pan-tilt-zoom (PTZ) systems [23,24], and industrial cameras [25]. As zoom lenses are predominantly used in computer vision, research into their calibration arose from the computer vision community [26].…”

Section: Related Workmentioning

confidence: 99%

“…Sarkis et al [25] introduced a technique for modeling intrinsic parameters as local functions of clustered lens settings. The model was based on the moving least squares scheme.…”

Section: Related Workmentioning

confidence: 99%

A Flexible, Generic Photogrammetric Approach to Zoom Lens Calibration

et al. 2017

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Abstract:Compared with prime lenses, zoom lenses have inherent advantages in terms of operational flexibility. Zoom lens camera systems have therefore been extensively adopted in computer vision where precise measurement is not the primary objective. However, the variation of intrinsic camera parameters with respect to zoom lens settings poses a series of calibration challenges that have inhibited widespread use in close-range photogrammetry. A flexible zoom lens calibration methodology is therefore proposed in this study, developed with the aim of simplifying the calibration process and promoting practical photogrammetric application. A zoom-dependent camera model that incorporates empirical zoom-related intrinsic parameters into the collinearity condition equations is developed. Coefficients of intrinsic parameters are solved in a single adjustment based on this zoom lens camera model. To validate the approach, experiments on both optical-and digital-zoom lens cameras were conducted using a planar board with evenly distributed circular targets. Zoom lens calibration was performed with images taken at four different zoom settings spread throughout the zoom range of a lens. Photogrammetric accuracies achieved through both mono-focal and multi-focal triangulations were evaluated after calibration. The relative accuracies for mono-focal triangulations ranged from 1: 6300 to 1: 18,400 for the two cameras studied, whereas the multi-focal triangulation accuracies ranged from 1: 11,300 to 1: 16,200. In order to demonstrate the applicability of the approach, calibrated zoom lens imagery was used to render a laser-scanned point cloud of a building façade. Considered alongside experimental results, the successful application demonstrates the feasibility of the proposed calibration method, thereby facilitating the adoption of zoom lens cameras in close range photogrammetry for a wide range of scientific and practical applications.

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“…[20][21][22][23] In 2000, Y-S Chen et al 24 from National Taiwan University proposed a simple and effective method of calibrating electric zoom cameras' internal parameters. In 2001, a laboratory, CVIP at the University of Louisville, calibrated the zoom camera parameters using neural 25 In 2009, M Sarkis et al 26 from Technical University of Munich (Germany) calibrated automatic zoom camera using the least square method. In 2010, the Health Science College of Milwaukee University (USA) and the Broadcasting Institute of Technology of Yonsei University (Korea) jointly corrected the radial distortion of the automatic zoom camera.…”

Section: Introductionmentioning

confidence: 99%

Pose measurement model of space cooperative target capture based on zoom vision system

Xia

Guo

et al. 2016

Advances in Mechanical Engineering

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In view of the mission of the cooperative target capture with the space manipulator, this article proposes to establish pose measurement model of the space cooperative target capture based on thick lens model for the first time. First, a ground simulation system is established for the cooperative target capture with the space manipulator based on the zoom vision system, coordinate system is defined, and pose calculation process is given. Then, space coordinate measurement model and pose calculation model are established for the system. Finally, the simulation experiments are conducted and the results validate the algorithm model and the high accuracy of measurement.

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Calibrating an Automatic Zoom Camera With Moving Least Squares

Cited by 18 publications

References 35 publications

Zoom lens calibration with zoom- and focus-related intrinsic parameters applied to bundle adjustment

Zoom lens calibration with zoom- and focus-related intrinsic parameters applied to bundle adjustment

A Flexible, Generic Photogrammetric Approach to Zoom Lens Calibration

Pose measurement model of space cooperative target capture based on zoom vision system

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