Automatic measurement of images on astrometric plates

Details Automatic measurement of images on astrometric plates Automatic measurement of images on astrometric plates

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..349o&link_type=abstract

Planetary and Space Science, vol. 42, no. 4, p. 349-357

Mathematics

Logic

Algorithms, Astrometry, Astronomical Photography, Image Processing, Pattern Recognition, Charge Coupled Devices, Mean Square Values, Numerical Control, Photographic Plates, Stepping Motors

Scientific paper

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 charge coupled devices (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 centering;--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).

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