Analyze Spectrum

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o.cefet cefet
o.cefet cefet 2011 年 10 月 20 日
Through image = imread (image.tiff), then Y = fftshift applied (fft2 (image)).
Viewed the spectrum through imshow (log (abs (A )),[]) as also by imshow (A, [0 100000]).
The result of the spectrum has four points in the corners. Would anyone interpret this spectrum?
Follow the link and the image obtained by FFT.
https://plus.google.com/u/0/photos/114934434917061582852/albums/5665646538614353345/5665646540211763538#photos/114934434917061582852/albums/5665646538614353345/5665646540211763538

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