3D Reconstruction from SECCHI-EUVI images using an optical flow algorithm: Method description and observation of an erupting filament

Gissot, Samuel;Hochedez, J. -F.;Chainais, P.;Antoine, Jean-Pierre
(2008) Solar Physics : a journal for solar and solar-stellar research and the study of solar terrestrial physics — Vol. 252, n° 2, p. 397-408 (2008)

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Authors
  • Gissot, SamuelUCLouvain
    Author
  • Hochedez, J. -F.
    Author
  • Chainais, P.
    Author
  • Antoine, Jean-Pierreorcid-logoUCLouvain
    Author
Abstract
SECCHI-EUVI telescopes provide the first EUV images enabling a 3D reconstruction of solar coronal structures. We present a stereoscopic reconstruction method based on the Velociraptor algorithm, a multiscale optical-flow method that estimates displacement maps in sequences of EUV images. Following earlier calibration on sequences of SOHO-EIT data, we apply the algorithm to retrieve depth information from the two STEREO viewpoints using the SECCHI-EUVI telescope. We first establish a simple reconstruction formula that gives the radial distance to the centre of the Sun of a point identified both in EUVI-A and EUVI-B from the separation angle and the displacement map. We select pairs of images taken in the 30.4 nm passband of EUVI-A and EUVI-B, and apply a rigid transform from the EUVI-B image in order to set both images in the same frame of reference. The optical flow computation provides displacement maps from which we reconstruct a dense map of depths using the stereoscopic reconstruction formula. Finally, we discuss the estimation of the height of an erupting filament.
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Gissot, S., Hochedez, J.-F., Chainais, P., & Antoine, J.-P. (2008). 3D Reconstruction from SECCHI-EUVI images using an optical flow algorithm: Method description and observation of an erupting filament. Solar Physics : a journal for solar and solar-stellar research and the study of solar terrestrial physics, 252(2), 397-408. https://doi.org/10.1007/s11207-008-9270-0 (Original work published 2008)