AUTOMATIC-MEASUREMENT OF IMAGES ON ASTROMETRIC PLATES

Author(s): ORTIZ-GIL, A; LOPEZ GARCIA, A; GONZALEZ, JMM; et al.

Source: PLANETARY AND SPACE SCIENCE  Volume: 42   Issue: 4   Pages: 349-357   DOI: 10.1016/0032-0633(94)90109-0   Published: APR 1994

We present some results on the process of automatic detection and measurement of objects in overlapped fields of astrometric plates. The main steps of our algorithm are the following: determination of the Scale and Tilt between CCD and microscope coordinate systems and estimation of signal-to-noise ratio in each field;-image identification and improvement of its position and size;-image final centring;-image selection and storage. Several parameters allow the use of variable criteria for image identification, characterization and selection. Problems related with faint images and crowded fields will be approached by special techniques (morphological filters, histogram properties and fitting models).