TopHat Filter for EELS
 Practical Electron Microscopy and Database   An Online Book  

Microanalysis  EM Book http://www.globalsino.com/EM/  


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Tophat filter had been suggested as a digital filter for EELS to detect and identify weak coreedges, and supprese steepsloped background to get a linear baseline in EELS. [1] As shown in Figure 1002, in the EELS spectrum, assuming the filter width is w, then the integrated intensities (signals) of the three adjoining areas are given by S_{x1}, S_{x}, and S_{x+1}. Therefore, the filtered value in the window x_{i} is given by, Note that smoothing effect becomes stronger with the increase of the filter width w. [1] A filter script is: (script file)
[1] Jun Hosoi, Tetsuo Oikawa, Masao Inoue and Yasushi Kokubo, J. Electron Microsc, Vol. 34, No. 1, 17, 1985.


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