Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXIX-B3, 269-274, 2012
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B3/269/2012/
doi:10.5194/isprsarchives-XXXIX-B3-269-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
31 Jul 2012
RECONSTRUCTION OF SKY ILLUMINATION DOMES FROM GROUND-BASED PANORAMAS
F. Coubard1, L. Lelégard1, M. Brédif1, N. Paparoditis1, and X. Briottet2 1Université Paris-Est, Institut Géographique National, MATIS lab, 73, avenue de Paris, 94165 SAINT-MANDÉ, FRANCE
2ONERA – DOTA 2, avenue Édouard Belin, 31055 TOULOUSE, FRANCE
Keywords: Sky radiance, illumination, environment map, terrestrial images Abstract. The knowledge of the sky illumination is important for radiometric corrections and for computer graphics applications such as relighting or augmented reality. We propose an approach to compute environment maps, representing the sky radiance, from a set of ground-based images acquired by a panoramic acquisition system, for instance a mobile-mapping system. These images can be affected by important radiometric artifacts, such as bloom or overexposure. A Perez radiance model is estimated with the blue sky pixels of the images, and used to compute additive corrections in order to reduce these radiometric artifacts. The sky pixels are then aggregated in an environment map, which still suffers from discontinuities on stitching edges. The influence of the quality of estimated sky radiance on the simulated light signal is measured quantitatively on a simple synthetic urban scene; in our case, the maximal error for the total sensor radiance is about 10%.
Conference paper (PDF, 12385 KB)


Citation: Coubard, F., Lelégard, L., Brédif, M., Paparoditis, N., and Briottet, X.: RECONSTRUCTION OF SKY ILLUMINATION DOMES FROM GROUND-BASED PANORAMAS, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXIX-B3, 269-274, doi:10.5194/isprsarchives-XXXIX-B3-269-2012, 2012.

BibTeX EndNote Reference Manager XML