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Дата изменения: Fri Feb 23 12:58:06 1996 Дата индексирования: Tue Oct 2 17:59:58 2012 Кодировка: Поисковые слова: crab nebula |
In the previous algorithm we do not use the hierarchy of structures. We have explored many approaches for introducing a non-linear hierarchical law in the adaptive filtering and we found that the best way was to link the threshold to the wavelet coefficient of the previous plane . We get:
and L is a threshold estimated by:
where is the standard deviation of . The function must return a value between 0 and 1. A possible function for t is: