Image Analysis

Astrometry

applying and displaying celestial coordinates to an image.

Photometry

interactive measurements of selected stars using a circular or elliptical aperture.

Automatic object detection

automatic detection of the objects in an image. A set of parameters (positions, brightness, ellipticity etc) are computed for all the objects detected.

Surface photometry

Surface photometry of galaxies, including determining radial profiles and fitting elliptical isophotes.

Image patching

interactive removal of image blemishes and contaminating objects from an image. For example, foreground stars might be removed from a galaxy image.

Properties of image regions

statistics, extraction and removal of shaped regions of an image.

Image comparison

two images can be compared by either plotting one as a set of contours superimposed on the other or by blinking between the two images ( cf the `blink comparator' used to compare two photographic plates).

Object position and statistics

two-dimensional Gaussian fits to single or multiple objects.

Polarisation plotting

polarisation maps can be plotted, regions selected from them etc. These facilities are intended to be used in conjunction with the POLPACK package for polarimetry and spectropolarimetry (see SUN/223[1]).

Profiles of rectangular regions

Interactive averaged profiles along the $x$ and $y$ axes of a rectangle.