[SciPy-User] How to convolve with transfer function

[rmain at gmx.de]

Hi everyone. I want to do the following:
I have an image and want to apply the transfer function 
http://www.abload.de/img/tfbiif7.png to my image. However, in the 
article I am using it said the following:
"Due to the singularity in the log function at the origin, one cannot 
construct an analytic expression for the shape
of the Log-Gabor function in the spatial domain. Therefore, the filters 
are constructed in the frequency domain."
So it has to be used in the frequency domain. I first have to transform 
my image via FFT. For that, I found the function numpy.fft.rfft2 which 
does the transformation. However I'm at a loss on how to apply the 
transfer function to the array. I found the scipy.signal.convolve 
method, however that one seems to work with arrays. But I can't figure 
out how to convolve with this transfer function if it can't be defined 
as an array.
Would you please help me with my problem?

Cheers
Robert