sigma of gabor filter

2012 3 12
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sigma values in x an y direction should be the same or different in filtering with gabor filter, which one is better and why?what are the factors affecting the decision?

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Stefan
Stefan 2012-4-30

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Hi Mahua, you can choose if sigma_x and sigma_y are the same or different values. These values decide about the eliptic shape of the gaussian envelope of the gabor filter. if both sigma are the same, than it's an circle otherwise it would have an eliptic form.
to decide which values to choose depends on your wish for acurate detection. if you use the same value there might be undetected features at specific angles in the frequency space.
for more details watch my file an the related reference: http://www.mathworks.com/matlabcentral/fileexchange/36382-gabor-feature
i would apprechiate your comment/rating.
feel free to ask, if there will be further questions. :)

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