how to calculate the slope of the log-log magnitude spectra of an image?

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how to calculate the slope of the log-log magnitude spectra of an image?

Crowell Elizabeth
Dear ImageJ group,

I need to calculate the slope of the log-log magnitude spectra of my
images.  This slope is sometimes used to provide an estimate of the
degree of focus of an image.  I would like to calculate it in ImageJ.  
Can anyone give me a clue of what it represents and how it can be
calculated?

Kind Regards,

--

Elizabeth CROWELL

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Membrane Traffic and Cell Division Research Group
Institut Pasteur
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75015 PARIS, France

Tel :  01.44.38.94.07
Fax : 01.45.68.89.54
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