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. A system for the analysis of astronomical images has resulted. 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. At the same time, it has explored the application in astronomy of many data analysis methods, such as
Bayesian analysis, mathematical morphology or blind source separation methods, multi-band image analysis. 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. His work has been applied to several scientific fields in astrophysics, Earth observation and
biological and
medical imaging. ==References==