The Graphical Astronomy and Image Analysis Tool (GAIA - SUN/214), has an interactive toolbox
facility that uses the
SExtractor) programs. This allows you to interactively adjust
the detection preferences and identifies the objects that have been detected by drawing suitable
ellipses over your image (in fact GAIA produced the image used on the title page of this
GAIA also displays the results catalogue so you can view the measurements associated with each object and vice versa (i.e. you can select one of the displayed ellipses and view the associated measurements, or select a row of measurements and view the associated object). The catalogue interface also allows you to sort and select objects on the basis of their measurements.