Lucy-Hook coaddition method

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The Lucy-Hook coaddition method is an image processing technique for combining sub-stepped astronomical image data onto a finer grid. The method allows the option of resolution and contrast enhancement or the choice of a conservative, re-convolved, output.

Tests with very deep Hubble Space Telescope Wide Field and Planetary Camera 2 (WFPC2) imaging data of excellent quality show that these methods can be very effective and allow fine scale features to be studied better than on the unprocessed images. The Lucy-Hook coaddition method is an extension of the standard Richardson-Lucy iterative restoration method.

For many purposes it may be more convenient to combine dithered datasets using the Drizzle (image processing) method.