Albert Bijaoui

Albert Bijaoui (born in Monastir in 1943) is a French astronomer, former student of the Ecole Polytechnique (X 1962), renowned in image processing in astrophysics and its application in cosmology, he then prepared his PhD thesis at the Paris Observatory, under the supervision of André Lallemand. He defended his thesis at the Université Denis Diderot (Paris VII) in March 1971.

He has been a corresponding member of the French Academy of sciences since 1997.[1]

Biography

Trainee then Research Associate at the CNRS at the Paris Observatory, then at the Nice Observatory, he became an Astronomer at the Nice Observatory in 1972. He is Honorary Astronomer at the Observatoire de la Côte d'Azur since 2015. He was Director of the Centre de Dépouillement des Clichés Astronomiques at the Institut National d'Astronomie et de Géophysique between 1973 and 1981. He was also director of the Cassiopeia laboratory (UMR CNRS/OCA) between 2004 and 2007.

He experimented with André Lallemand's electronic camera in 1970 at the 1.93 m telescope at the Haute-Provence Observatory.

The asteroid Bijaoui was named in his honour.

Scientific work

His research work has focused on various themes related to astronomical imaging. During the preparation of his thesis, he contributed to the development of electronography with the study and interpretation of the properties of André Lallemand's electronic camera. In parallel, he was involved in its exploitation for astrophysical purposes. With the creation in 1973 of the Centre de Dépouillement des Clichés Astronomiques at Nice Observatory, he was involved in the development of new methods for the analysis of astrophysical data and in the creation of software to exploit them for the French astronomical community.[2][3][4] A system for the analysis of astronomical images has resulted.[5] It will be widely disseminated in the astronomical community. With the commissioning of INAG's Schmidt telescope on the Calern plateau near Caussols in the Alpes-Maritimes, INAG has become involved in the analysis of large images of the sky obtained with this type of instrument. The resulting exploitation of galaxy counts led him to introduce the use of wavelet transforme and multi-scale methods in the processing of astronomical data.[6][7][8][9][10][11][12][13][14][15][16] At the same time, it has explored the application in astronomy of many data analysis methods, such as Bayesian analysis,[2][17] mathematical morphology[18] or blind source separation methods,[19] multi-band image analysis.[20] His latest work concerned his involvement in the preparation of the ESA Gaia astronomical mission. In particular, he has developed specific tools for the determination of the atmospheric parameters of stars from their spectra, with model grid learning.[21][22]

His work has been applied to several scientific fields in astrophysics, Earth observation[23] and biological and medical imaging.[24]

References
  1. "Académie des sciences".
  2. Bijaoui A., Skybackground estimation and application , Astron. and Astrophys., v.84, 1980, p. 81-84
  3. Bijaoui A. et Froeschlé M., A new algorithm to determine image edges. Application to lunar craters , Astron. and Astrophys., v.87, 1980, p. 250
  4. Bijaoui A., Image et Information. Introduction au traitement numérique des images, Paris, Masson, 1ere édition 1981, 2nde édition 1984
  5. Bijaoui A., Marchal J. et Ounnas C., A general System for Astronomical Image Analysis , Astron. and Astrophys., v.65, 1978, p. 71-75
  6. Slezak E., Bijaoui A., et Mars G., Structures identification from galaxy counts: use of the Wavelet Transform , Astron. and Astrophys., 227, 1990, p. 301-316
  7. Slezak E., de Lapparent V., Bijaoui A., Objective Detection of voids and High density structures in the first CfA redshift survey slice , Ap. J., 409, 1993, p. 517-529
  8. Starck J.L., Bijaoui A., Filtering and Deconvolution by the Wavelet Transform , Signal Processing, vol.35, 1994, p. 195-211
  9. Starck J.L., Bijaoui A., Lopez B., Perrier C., Image reconstruction by the Wavelet Transform applied to the aperture synthesis , Astron. Astrophys., 283, 1994, p. 349-360
  10. Bijaoui A., Starck J.L., Murtagh F., Restauration des images multi-échelles par l'algorithme à trous , Traitement du Signal et des Images, v.11 n.3, 1994, p. 229-243
  11. Bijaoui A., Rué F., A Vision Model adapted to the astronomical images , Signal Processing, v.46 n.3, 1995, p. 345-362
  12. Lega E., Bijaoui A., Alimi J.M., Scholl H., A Morphological Indicator for comparing simulated cosmological scenarii with observations , Astron. Astroph., 309, 1996, p. 23-29
  13. Bijaoui A., Slezak E., Rué F., Lega E., Wavelets and the distant universe , Proceedings of the IEEE special issue on wavelets, v.84 n.4, 1996, p. 670-679
  14. Starck J.L., Murtagh F., Bijaoui A., Image Processing and Data Analysis in the Physical Sciences. TheMultiscale Approach, Cambridge, Cambridge University Press, avril 1998
  15. Bijaoui A., Wavelet and astrophysical applications. Wavelet in physics, Cambridge, ed. J.C.VandenBergh, Cambridge University Press, 1999, p. 77-115
  16. Bourdin H., Sauvageot, J.L., Slezak, E., Bijaoui, A., Teyssier, R., Temperature map computation for X-ray clusters of galaxies , Astronomy & Astrophysics, 414, 2004, p. 429-443
  17. Bijaoui A., Wavelets, Gaussian Mixtures and the Wiener Filtering , Signal Processing, 82, 2002, p. 709-712
  18. Huang L., Bijaoui A., Astronomical Image data compression by morphological transformations , Experimental Astronomy 1, 1991, p. 311-327
  19. Nuzillard D., Bijaoui A., Blind Source Separation and Analysis of Multispectral Astronomical Images , Astron. Astrophys. Sup. Ser., v.147, 2000, p. 129-138
  20. Bijaoui, A., Guennec, A., Benoist, C. and Slezak, E., Analysis of multiband astronomical images using multiscale tools", Wavelet Applications in Industrial Processing III , eds. F. Truchetet and O. Laligant, SPIE, 6001, 2005, p. 600101_1-600101_11
  21. Recio-Blanco, A., Bijaoui, A. and de Laverny, P., Automated derivation of stellar atmospheric parameters and chemical abundances: the MATISSE algorithm , M.N.R.A.S., 370, 2006, p. 141-150
  22. Bijaoui, A., Recio-Blanco, A., de Laverny, P. and Ordenovic, C., Parameter estimation from a model grid application to the Gaia RVS spectra , Statistical Methodology, vol.9, 2012, p. 55
  23. Djamdji J.P., Bijaoui A., Manière R., Geometrical Registration of images. The multiresolution approach , Photogrammetric Engineering and Remote sensing, 59, 1993, p. 645-653
  24. Jammal G., Bijaoui A., DeQuant: a flexible multiresolution restoration framework , Signal Processing, 84, 2004, p. 1049-1069
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