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The Fourier transform of 2D Gabor filters is shown below: enter image description here

F is the radial frequency of the Gabor functions. Another parameter Fm is denoted as highest central frequency. Fr is the constant frequency ratio.

My question is : 1. central frequency is radial frequency? 2. so , Fm is the largest value among values of F? 3. Is F a series with common ratio Fr ?

Thank you very much for any help.

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