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How band pass filtering is physically achieved by convolving logGabor filter generated with some center frequency?

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Richa Sharma
Richa Sharma 2012-6-5
回答： Laurent 2014-10-29
Hi, I am trying to understand LogGabor filters in frequency domain.I understand that A complex Gabor filter is defined as the product of a Gaussian kernel times a complex sinusoid.
"The goal is to isolate an 80 hertz band of frequencies centered on 2 kHz. "
My doubt is -How this is physically achieved by convolving logGabor filter generated with center frequency 2 hz. How it actually gives the required output?I am not able to visualize this. I am using gaborconvolve.m function from http://www.csse.uwa.edu.au/~pk/studentprojects/libor/sourcecode.html

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Laurent
Laurent 2014-10-29
The difference betwwen Gabors and log-Gabors is small for low bandwidths but important:
the gaussian enveloppe is on the linear scale of frequencies for Gabors, but on a logarithmic scale for frequencies for log-Gabors (hence the name).
if you are interested in more info + python code, something similar is coded using the package available @ https://pythonhosted.org/LogGabor/

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