Author Archives: almansa

Extraction et suppression de sources ponctuelles en imagerie SAR

Description En imagerie radar à synthèse d’ouverture certaines structures urbaines peuvent produire des réponses ponctuelles beaucoup plus fortes que leur entourage. Cette réponse très forte couplée à la réponse impulsionnelle (sinc) de l’instrument produit une tache qui dépasse largement le … Continue reading

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Multi-stereo reconstruction using the EPI method on SkySat videos

The epipolar plane image analysis method was introduced by Bolles [1] and later refined by Kim et.al [2], as a way to estimate depth from a sequence of images taken from different points lying along a straight line. The method was … Continue reading

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Using a Gaussian denoiser for mixed Poisson-Gaussian noise

Even though noise present in satellite optical images is a mixture of Poisson and Gaussian noise, the great majority of denoisers work only in the case of Gaussian noise. A common way to circumvent this inadequacy consists in Approximating the … Continue reading

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Subpixel multi-stereo in interferometric hyperspectral imaging

Context The process of acquiring interferometric hyperspectral images from airborne or satellite sensors [1,2] comprises several steps, including : Rectification of the image sequence to a common epipolar geometry to build an epipolar plane image (EPI) sequence. Decomposition of each … Continue reading

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Sample Project

Projects shall be announced here by mid February. Project assignments shall be announced before the end of February taking your preferred choices into account.

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SGM using a terrain-geometry cost volume

Global stereo matching formulations rely on piecewise constant disparity priors. For satellite images this is adequate for near-nadir views, where discontinuities are naturally associated to vertical walls. However, for slanted views this yields an asymmetry in the handling of occlusions … Continue reading

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Scalable multi-view stereo reconstruction with disparity uncertainty modeling

The objective of this project is to analyze and implement the method proposed in [1]. The proposed multi-view stereo method performs local fusion of disparity maps obtained with semi-global matching for reconstructing large scenes composed of hundreds of images. Careful … Continue reading

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Stereo pipeline extension to handle Planet pairs and triplets

The optical stereo pipeline described in the course is a simplified version of the S2P pipeline [1], which was developed for high resolution pushbroom satellites such as Pleiades or WorldView. One of the particularities of these satellites is that the … Continue reading

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3D reconstruction from SkySat videos by fusion of stereo pairs

The SkySat video products provide hundreds of projective camera frames of a single target. The goal of this project is to compute a 3D model by fusing independent reconstructions obtained from several image pairs. A method for selecting stereo pairs … Continue reading

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Reconstruction 3d par la méthode des plans épipolaires avec vidéos SkySat

L’objectif de ce projet est de développer un algorithme d’estimation du relief 3D à partir d’une vidéo haute résolution en utilisant la méthode des images de plans épipolaires, introduite par Bolles en 1987 [1] et récemment raffinée par Kim et.al … Continue reading

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