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First time studying image processing...
I just don't understand what does fourier transformed image of an image describe?
For example consider given following pictures, The first one is the image, and the second one is the fourier transformation of the image.

The Lena image The fourier transformation of lena


Now my question is:
By given the fourier transformation image, what am i suppose to comprehend from that?

I would really appreciate any help here, i just cannot proceed with my studies without understanding this.

Thanks in advance.

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