555 AFlexibleMethodforZoomLensCalibrationand ModelingUsingaPlanarCheckerboard

A new technique for three-dimensional (3D) camera calibration for machine vision metrology using off-the-shelf TV cameras and lenses is described. The two-stage technique is aimed at efficient computation of camera external position and orientation relative to object reference coordinate system as well as the effective focal length, radial lens distortion, and image scanning parameters. The two-stage technique has advantage in terms of accuracy, speed, and versatility over existing state of the art. A critical review of the state of the art is given in the beginning. A theoretical framework is established, supported by comprehensive proof in five appendixes, and may pave the way for future research on 3D robotics vision. Test results using real data are described. Both accuracy and speed are reported. The experimental results are analyzed and compared with theoretical prediction. Recent effort indicates that with slight modification, the two-stage calibration can be done in real time.

A versatile camera calibration technique for high-accuracy 3D machine vision metrology using off-the-shelf TV cameras and lenses

Over the 25 years since the introduction of analytical camera self-calibration there has been a revolution in close-range photogrammetric image acquisition systems. High-resolution, large-area ‘digital’ CCD sensors have all but replaced film cameras. Throughout the period of this transition, self-calibration models have remained essentially unchanged. This paper reviews the application of analytical self-calibration to digital cameras. Computer vision perspectives are touched upon, the quality of self-calibration is discussed, and an overview is given of each of the four main sources of departures from collinearity in CCD cameras. Practical issues are also addressed and experimental results are used to highlight important characteristics of digital camera self-calibration.

Digital camera self-calibration

Camera calibration has always been an essential component of photogrammetric measurement, with self-calibration nowadays being an integral and routinely applied operation within photogrammetric triangulation, especially in high-accuracy close-range measurement. With the very rapid growth in adoption of off-the-shelf digital cameras for a host of new 3D measurement applications, however, there are many situations where the geometry of the image network will not support robust recovery of camera parameters via on-the-job calibration. For this reason, stand-alone camera calibration has again emerged as an important issue in close-range photogrammetry, and it also remains a topic of research interest in computer vision. This paper overviews the current approaches adopted for camera calibration in close-range photogrammetry and computer vision, and discusses operational aspects for self-calibration. Also, the results of camera calibrations using different algorithms are summarized. Finally, the impact of chromatic aberration on modelled radial distortion is touched upon to highlight the fact that there are still issues of research interest in the photogrammetric calibration of consumer-grade digital cameras.

Digital camera calibration methods: Considerations and comparisons

Corriger les images de la distorsion des chambres de prises de vues a ete une preoccupation importante des usagers, aussi longtemps qu'ils ont voulu utiliser ou reconstituer fidelement les informations observees. La cartographie a ete initialement la principale application. Tandis que cette tâche se poursuit de nos jours, d'autres applications necessitent egalement un etalonnage precis des chambres, telles que les determinations tridimensionnelles a courte distance et de nombreuses autres mesures a deux dimensions. Dans le passe, les chambres utilisees etaient peu nombreuses et tres onereuses tandis qu'aujourdhui une grande societe industrielle aura normalement de nombreuses cameras bon marche qu'il utilisera pour des travaux de mesures tres importants. On se sert de nos jours de cameras beaucoup plus qu'on ne le fit jamais, mais l'âge d'or de l'etalonnage des chambres de prises de vues aeriennes pour la cartographie est desormais termine. On examine dans cet article quelques uns des essais et des developpements-cles et on les remet en perspective. On y met en particulier en evidence les forces sous-jacentes qui ont preside a chaque amelioration.

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555 AFlexibleMethodforZoomLensCalibrationand ModelingUsingaPlanarCheckerboard

References

A versatile camera calibration technique for high-accuracy 3D machine vision metrology using off-the-shelf TV cameras and lenses

A versatile camera calibration technique for high-accuracy 3D machine vision metrology using off-the-shelf TV cameras and lenses

Digital camera self-calibration

Digital camera calibration methods: Considerations and comparisons

The Development of Camera Calibration Methods and Models