DSK_LOCB (disk locator) will find the center
coordinates and disk radius of an optical solar image.
It currently works on white light, H
, and magnetogram images, or
anything with a clearly defined edge. The images are all treated using
a histogram technique. (There is an old routine called DSK_LOC
that uses a derivative technique for white light etc., as they
have a high and noisy background).
A sample call is:
IDL> dsk_locb, image, horzcnt=x0, vertcnt=y0, horzrad=rx, vertrad=ry
where the keywords return the values of the radius and disk center.
A complete list of the optional keywords follows:
