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asked 2012-08-02 05:03:08 -0500

sammy gravatar image

How to intuitively interpred Gabor lambda param?

I am playing with the newly added Gabor filters. I know some basics about them, and how they are used for recognition tasks. But I have troubles understanding in an intuitive way (not by writing complicated math formulas) what is the meaning of the lambda parameter.

Here is the formula, from Wiki:

image description

And here are some pictures, where I varied lambda:

lambda = CV_PI

image description

lambda = CV_PI/2

image description

lambda = CV_PI/4

image description

The other parameters are as follows:

gaborKernel = getGaborKernel( cv::Size(15, 15) , 3, -CV_PI/4, lambda, 1, CV_PI, CV_32F );

How to intuitively interpred interpret Gabor lambda param?

I am playing with the newly added Gabor filters. I know some basics about them, and how they are used for recognition tasks. But I have troubles understanding in an intuitive way (not by writing complicated math formulas) what is the meaning of the lambda parameter.

Here is the formula, from Wiki:

image description

And here are some pictures, where I varied lambda:

lambda = CV_PI

image description

lambda = CV_PI/2

image description

lambda = CV_PI/4

image description

The other parameters are as follows:

gaborKernel = getGaborKernel( cv::Size(15, 15) , 3, -CV_PI/4, lambda, 1, CV_PI, CV_32F );