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Дата изменения: Fri Feb 23 12:57:47 1996 Дата индексирования: Tue Oct 2 17:15:40 2012 Кодировка: Поисковые слова: annular solar eclipse |
The previous sections have described the most frequently used computational techniques for image handling in optical astronomy. After the images have been calibrated and manipulated to give the best representation of the data the astronomical information has to be extracted. For frames which contain a large number of objects automatic methods are required to locate them. A set of parameters is then estimated for the individual objects (e.g. position, total intensity, or velocity) depending on type and observational technique.