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Fig. 6 | Journal of Applied Volcanology

Fig. 6

From: Volcanic plume height monitoring using calibrated web cameras at the Icelandic Meteorological Office: system overview and first application during the 2021 Fagradalsfjall eruption

Fig. 6

Venn diagram showing the calibration techniques that can be used to estimate the camera parameters. Camera parameters can be classified as intrinsic, i.e. those that stay the same when the camera moves (focal length, principal point, distortion coefficients) and extrinsic, i.e. those that change when the camera moves (location, orientation). All the intrinsic and extrinsic parameters are needed to make measurements from webcam images. Different calibration techniques can be used to find some, or all, of these parameters, e.g. horizon matching can be used to find focal length and orientation, while chessboard calibration can be used to find focal length and principal point and distortion coefficients

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Journal of Applied Volcanology

ISSN: 2191-5040

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