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19 juin 2018

Image based rendering of large historical image collections

Catégorie : Doctorant

PhD position funded by an ANR grant ALEGORIA

Title "Image based rendering of large historical image collections"

Scientific fields : computer graphics, computer vision

Keywords: Image based rendering, Real-time rendering, 3D, Uncertainty.

Detailed description of the project:

Scientific and work environment : The doctoral position will be located at the IGN/Lastig laboratory in Saint Mandé and depend on the Paris-Est University. Developments will be based on the iTowns research platform : https://www.itowns-project.org/ )

Contact : mathieu.bredif@ign.fr


Context and Research Goal

With the advent of large historical image collections (postcards, engravings, paintings, street level or aerial photographs...), the classical approach, consisting of browsing image galleries, is likely not providing sufficient context to give users an immersive feeling, for them to fully understand the context and spatial relationships between images. We propose to enable the discovery and continuous navigation within these image collections through space and time. However, this cannot be based on the rendering of 3D models as they may not be available and their 3D reconstruction may be impossible due to insufficient data. Whereas recent datasets may present massive amounts of precisely calibrated images and accurate 3D models and point clouds, with dense viewpoint sampling and homogeneous radiometry (e.g. using mobile mapping systems [Paparoditis12]), historical datasets are likely featuring sparsely sampled image viewpoints, and thus their calibration and pose estimation [Aubry14] may be imprecise. Moreover, pixel values may not be directly comparable (due to the digitization process or scene and illumination changes, for instance). By morphing and blending input images, Image based rendering techniques (IBR) may synthesize novel views from calibrated images [Hedman16] and may handle little or no geometrical information [Buehler01, Goesele10].

Contrary to textured models, a novel IBR view from the viewpoint of an input image may directly display that image. This is a valuable property of IBR techniques: their resulting image quality degrades gracefully as the synthesized viewpoint departs from the viewpoints of the input images. IBR techniques have been extended to take some aspects of uncertainty into account [Eisemann08, Brédif14] or heterogeneous datasets (such as point clouds and simplified meshes in [Devaux16]).


Research will be conducted to tackle the following scientific aspects:

Due to the massive amount of recent and historical images, the proposed approach will focus on its performance and scalability, as the goal is to propose a real-time, interactive and continuous navigation through these large image collections. 


This PhD position is funded by the French research project ALEGORIA (ANR). This project targets the valorization of large national iconographic collections, composed of photographs and postcards from vertical and oblique aerial imagery as well as terrestrial/street-level acquisitions. These collections are very rich in terms of content and span an extended historical period from between-wars to today. The ALEGORIA project as a whole focuses on indexing, interlinking and visualizing these datasets.


Mathieu Brédif​ , Researcher, ​ mathieu.bredif@ign.fr doing research on processing and real-time rendering of point clouds and images. LaSTIG/GeoVIS team, Paris-Est University/IGN


Computer Graphics with experience in js/WebGL programming (cf our research platform ​ iTowns​ ).


The PhD will take place at IGN, Saint-Mandé, very close to Paris, and the research will be conducted in the ​ LaSTIG​ / ​ GeoVIS team focusi


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