Re: Automating Image Processing and Problems with FFTJ

Posted by Michael Schmid on Sep 05, 2013; 4:12pm
URL: http://imagej.273.s1.nabble.com/Automating-Image-Processing-and-Problems-with-FFTJ-tp5004660p5004677.html

On Sep 5, 2013, at 13:45, Aaron Hendrickson wrote:

> Therefore, my second question is how to automate creating the PS [power spectrum] for each row or column image using FFTJ.

You can get the Power Spectrum also from ImageJ: Process>FFT>FFT Options.
The 'native' ImageJ FFT functions should be fully macro-recordable.
Note that the values may be surprisingly large; if you don't like this divide by the square of the number of pixels to normalize.

BTW, if you want the average power spectrum of all rows or columns in your image, I guess that it is equivalent to average over the columns or rows of the power spectrum of the full image instead (I must admit that have not gone through the math to check whether this is strictly true).
ImageJ can average over columns by Image>Adjust>Size from e.g. 512x512 to 512x1, with 'average when downsizing' enabled and 'interpolation=none'.

Michael

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