# Gabor Filter Parameter

I am doing research on images using gabor filter. I have read the following post:

Apply a Gabor filter to an input image

There must be some formula to determine the value for gamma,sigma,lambda,psi...can i know how to determine it?

## 1 Answer

The best values for these parameters depend on your application. You should probably try different values on a validation set to find out which ones work best for you.

• I am using it for feature extraction of finger vein and finger knuckle. – user7186 Dec 6 '13 at 7:30
• The lambda parameter sets the wavelength of your gabor filter. It's value depends on the width of what you're interested in. – Aaron Dec 6 '13 at 7:41
• I am using Matlab to do feature extraction of finger vein and finger knuckle. gb= exp(-.5*(x_theta.^2/sigma_x^2+y_theta.^2 /sigma_y^2)).*cos(2*pix_thetaf) From my understanding, sigma=sigma = lambda/pi*sqrt(log(2)/2)*(2^bw+1)/(2^bw-1); sigma_x = sigma; sigma_y = sigma/gamma; What are the suitable value for lambda,gamma,and bw? I am not quite understand about the width, can explain in detail? – user7186 Dec 6 '13 at 7:57