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The previous sections have described the most frequently used computational
techniques for image handling in optical astronomy.
After the images have been calibrated and manipulated to give the best
representation of the data the astronomical information has to be extracted.
For frames which contain a large number of objects automatic methods
are required to locate them.
A set of parameters is then estimated for the individual objects (e.g.
position, total intensity, or velocity) depending on type and
Extraction of Information