A Novel Technique to Model the Variation of the Intrinsic Parameters of an Automatic Zoom Camera using Adaptive Delaunay Meshes Over Moving Least-Squares Surfaces

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

doi:10.1109/icip.2007.4379856

Cited by 2 publications

(5 citation statements)

References 8 publications

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“…Sarkis et al used the moving least-squares (MLS) technique to model the intrinsic parameters' variation of zoom lens camera. 17,18 MLS was used to generate the surfaces of the camera's intrinsic parameters as a function of focus and zoom. The obtained surfaces then were used to estimate the intrinsic parameters in any focal length.…”

Section: Introductionmentioning

confidence: 99%

Automatic radial distortion correction in zoom lens video camera

Kim

Shin

et al. 2010

J. Electron. Imaging

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We present a novel method for automatically correcting the radial lens distortion in a zoom lens video camera system. We first define the zoom lens distortion model using an inherent characteristic of the zoom lens. Next, we sample some video frames with different focal lengths and estimate their radial distortion parameters and focal lengths. We then optimize the zoom lens distortion model with preestimated parameter pairs using the least-squares method. For more robust optimization, we divide the sample images into two groups according to distortion types (i.e., barrel and pincushion) and then separately optimize the zoom lens distortion models with respect to divided groups. Our results show that the zoom lens distortion model can accurately represent the radial distortion of a zoom lens. © 2010 SPIE and IS&T.

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Section: Introductionmentioning

confidence: 99%

Automatic radial distortion correction in zoom lens video camera

Kim

Shin

et al. 2010

J. Electron. Imaging

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“…22 and 23, which show sharp fluctuations in the high zoom settings. The unpredictable fluctuations in the principal point estimation in Ref.…”

Section: Experiments With Real Lens and Cameramentioning

confidence: 95%

“…The unpredictable fluctuations in the principal point estimation in Ref. 22 and 23, seem to be due to lack of constraints at the telephoto zoom settings, which is inevitable in the homography-based calibration methods. 21,24 On the other hand, a more robust technique with a 3D-equivalent calibration object was used in Ref.…”

Section: Experiments With Real Lens and Cameramentioning

confidence: 98%

“…We expect the proposed focus calibration technique will reduce the number of patterns required for calibration in such a scenario. Scattered data interpolation, or another technique to model the parameters as a function of focus and zoom 4,22,23 can be used for the completion of the calibration results.…”

Section: Experiments With Real Lens and Cameramentioning

confidence: 99%

“…22,23 This is because the estimated extrinsic parameters are given in each pattern's local coordinates. Another disadvantage of the homography-based calibration is that the calibration results are not accurate when the focal length is long.…”

Section: Introductionmentioning

confidence: 99%

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Semiautomatic zoom lens calibration based on the camera's rotation

Sohn

2011

J. Electron. Imaging

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Downloaded From: http://electronicimaging.spiedigitallibrary.org/ on 05/15/2015 Terms of Use: http://spiedl.org/terms Abstract. A zoom lens calibration consists of hundreds of monofocal calibrations, each of which takes considerable time and effort with conventional methods. We present a practical calibration method that consists of two separate procedures-zoom calibration and focus calibration. The zoom calibration regards each zoom setting as a monofocal camera, and takes advantage of both the pattern-based and the rotation-based approaches. A rotation sensor is utilized to overcome the ill-posedness caused by the many parameter dimensions. The zoom calibration is followed by the focus calibration process, which is fully automatic and available even at a defocused setting where the pattern detection is not possible. The focus calibration drastically reduces the number of required manual calibrations, from N 2 to N times. The experimental results are compared with the lens data sheets provided by the lens manufacturer. The overall calibration procedure is very quick compared to the conventional methods, owing to the proposed zoom and focus calibrations, and shows small enough parameter errors in the effective zoom-focus range. © 2011 SPIE and IS&T.

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A Novel Technique to Model the Variation of the Intrinsic Parameters of an Automatic Zoom Camera using Adaptive Delaunay Meshes Over Moving Least-Squares Surfaces

Cited by 2 publications

References 8 publications

Automatic radial distortion correction in zoom lens video camera

Automatic radial distortion correction in zoom lens video camera

Semiautomatic zoom lens calibration based on the camera's rotation

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