Drizzling dithered WFPC2 images

Details Drizzling dithered WFPC2 images Drizzling dithered WFPC2 images

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4107m&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #41.07; Bulletin of the American Astronomical Society, Vol. 29, p.1271

Physics

Optics

3

Scientific paper

The WFPC2 CCDs onboard the Hubble Space Telescope (HST) undersample the PSF delivered to them by the optics. On the three WF chips, the width of a pixel equals the FWHM of the PSF in the near-infrared, and greatly exceeds it in the blue. The image quality can be improved by combining sub-pixel dithered images. If the dithers are particularly well-placed, the pixels from each image can simply be interlaced on a finer grid. But in practice, imperfect offsets and the geometric distortion can make interlacing impossible. To combine the dithered images of the Hubble Deep Field, a new technique known as variable-pixel linear reconstruction, or ``drizzling'', was created. The IRAF/STSDAS task DRIZZLE and the other tasks in the DITHER package were created to help HST users reconstruct dithered WFPC2 images, and remove cosmic rays from singly-dithered images. We now demonstrate the use of these tasks with typical images from the HST archive.

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