A commonly ignored problem in planar mosaics, yet often present in practice, is the selection of a reference homography reprojection frame where to attach the successive image frames of the mosaic. A bad choice for the reference frame can lead to severe distortions in the mosaic and can degenerate in incorrect configurations after some sequential frame concatenations. This problem is accentuated in uncontrolled underwater acquisition setups as those provided by AUVs or ROVs due to both the noisy trajectory of the acquisition vehicle - with roll and pitch shakes - and to the non-flat nature of the seabed which tends to break the planarity assumption implicit in the mosaic construction. These scenarios can also introduce other undesired effects, such as light variations between successive frames, scattering and attenuation, vignetting, flickering and noise. This paper proposes a novel mosaicing pipeline, also including a strategy to select the best reference homography in planar mosaics from video sequences which minimizes the distortions induced on each image by the mosaic homography itself. Moreover, a new non-linear color correction scheme is incorporated to handle strong color and luminosity variations among the mosaic frames. Experimental evaluation of the proposed method on real, challenging underwater video sequences shows the validity of the approach, providing clear and visually appealing mosaics

Bellavia F., Fanfani M., Pazzaglia F., Colombo C., Costanzi R., Monni N., et al. (2015). Piecewise planar underwater mosaicing. In MTS/IEEE OCEANS 2015 - Genova: Discovering Sustainable Ocean Energy for a New World (pp. 1-7). Institute of Electrical and Electronics Engineers Inc. [10.1109/OCEANS-Genova.2015.7271367].

Piecewise planar underwater mosaicing

Bellavia F.;
2015-01-01

Abstract

A commonly ignored problem in planar mosaics, yet often present in practice, is the selection of a reference homography reprojection frame where to attach the successive image frames of the mosaic. A bad choice for the reference frame can lead to severe distortions in the mosaic and can degenerate in incorrect configurations after some sequential frame concatenations. This problem is accentuated in uncontrolled underwater acquisition setups as those provided by AUVs or ROVs due to both the noisy trajectory of the acquisition vehicle - with roll and pitch shakes - and to the non-flat nature of the seabed which tends to break the planarity assumption implicit in the mosaic construction. These scenarios can also introduce other undesired effects, such as light variations between successive frames, scattering and attenuation, vignetting, flickering and noise. This paper proposes a novel mosaicing pipeline, also including a strategy to select the best reference homography in planar mosaics from video sequences which minimizes the distortions induced on each image by the mosaic homography itself. Moreover, a new non-linear color correction scheme is incorporated to handle strong color and luminosity variations among the mosaic frames. Experimental evaluation of the proposed method on real, challenging underwater video sequences shows the validity of the approach, providing clear and visually appealing mosaics
Settore INF/01 - Informatica
Settore ING-INF/05 - Sistemi Di Elaborazione Delle Informazioni
978-1-4799-8736-8
Bellavia F., Fanfani M., Pazzaglia F., Colombo C., Costanzi R., Monni N., et al. (2015). Piecewise planar underwater mosaicing. In MTS/IEEE OCEANS 2015 - Genova: Discovering Sustainable Ocean Energy for a New World (pp. 1-7). Institute of Electrical and Electronics Engineers Inc. [10.1109/OCEANS-Genova.2015.7271367].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/385517
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