Shift-and-add

Shift-and-add

The shift-and-add method (more recently "image-stacking" method) is a form of speckle imaging commonly used for obtaining high quality images from a number of short exposures with varying image shifts. It has been used in astronomy for several decades, and is the basis for the image-stabilisation feature on some cameras. The method involves calculation of the differential shifts of the images. The images are then shifted back to a common centre and added together. This provides an image with higher resolution (higher signal-to-noise at high spatial frequencies) than a conventional long exposure image. A number of software packages exist for performing this, including IRAF, [http://registax.astronomy.net/ RegiStax] , [http://www.cs.unm.edu/~kwiley/software/keithsImageStacker.html Keiths Image Stacker] , [http://stekkit.blogspot.com/ Stekkit] and [http://www.astrosurf.com/buil/us/iris/iris.htm Iris] .

See also

* Lucky imaging

References

* Baba, N.; Isobe, S.; Norimoto, Y.; Noguchi, M. [http://ukads.nottingham.ac.uk/cgi-bin/nph-bib_query?bibcode=1985ApOpt..24.1403B&db_key=AST Stellar speckle image reconstruction by the shift-and-add method] , Applied Optics (ISSN 0003-6935), vol. 24, May 15, 1985, p. 1403-1405.


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