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Aims.Determination of horizontal velocity fields on the solar
surface is crucial for understanding the dynamics of structures like
mesogranulation or supergranulation or simply
the distribution of magnetic fields.
Methods.We pursue here the development of a method called CST for coherent
structure tracking, which determines the horizontal motion of granules in
the field of view.
Results.We first devise a generalization of Strous method for the segmentation of
images and show that when segmentation follows the shape of
granules more closely, granule tracking is less effective for large granules because
of increased sensitivity to granule fragmentation. We then introduce
the multi-resolution analysis on the velocity field, based on Daubechies
wavelets, which provides a view of this field on different scales. An
algorithm for computing the field derivatives, like the horizontal
divergence and the vertical vorticity, is also devised. The effects from the
lack of data or from terrestrial atmospheric distortion of the images are
also briefly discussed
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