The `CLEAN' algorithm, introduced by Högbom (1974), assumes that the radio sky can be represented by a small number of point sources in an otherwise empty field of view. It uses a simple iterative procedure to find the positions and strengths of these sources. The final deconvolved `CLEAN' image is the sum of:
We now describe some variants of the `CLEAN' algorithm, including two that can be used on large images.
1996 November 4