| http://www.w3.org/ns/prov#value | - A method in accordance with claim 9, wherein selecting the first set of pixels aligns a selection matrix according to the chromatic component of the at least one pixel, the selection matrix being such as to select pixels that are situatedin the neighborhood of the at least one pixel and having the same chromatic component as said at least one pixel and discard pixels having a different chromatic c
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