During the five years of the Gaia mission, a set of windows will be transmitted to the ground for each object. These windows will correspond to the same spatial field with different orientations and different samplings.
Claire Dollet (Ph.D., 2003), has studied the kind of images which would be restored from typical observation sets. The restoration algorithm was based on the Tikhonov regularization. Charles Peyrega (summer training, 2007) developed another algorithm based on the CLEANEST method. This algorithm was fine for restoring stellar fields, but less adapted to extended sources.
New approaches have to be developed in order to improve the sparsity of the Tikhonov restoration. This project is done in relation with the DPAC/CU6 team (extended objects).