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getGaborKernel and complex values

asked 2014-06-26 03:22:15 -0500

Bau Miao gravatar image

updated 2014-06-26 03:35:34 -0500

I need to generate a gabor Kernel, and for this purpose I use the getGaborKernel function.

But it seems that this function return me a kernel with real values, while i need a Gabor kernel with complex values.

How do I obtain this?! There is another function, or there are some parameters that give me complex values as result?!

thanks...

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answered 2014-06-26 08:30:55 -0500

According to the source code of the getGaborKernel() function (see here or refer to the source of OpenCV 2.4.9), it only returns the real part of a Gabor filter (see more at Gabor filter at wiki). For the imaginary part, you can change the source code line from:

double v = scale*std::exp(ex*xr*xr + ey*yr*yr)*cos(cscale*xr + psi);

to:

double v2 = scale*std::exp(ex*xr*xr + ey*yr*yr)*sin(cscale*xr + psi);

and return the Mat object containing all the needed values.

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guess you mean to actually add the v2 line and compute both instead of changing it, or am I wrong?

Guanta gravatar imageGuanta ( 2014-06-26 08:53:35 -0500 )edit
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I mean to write another function of the same code, except the line above, to return the imaginary part or, a little bit harder, in the same function, but return a Mat object of two channels: one for the real part, the other for the imaginary part.

tuannhtn gravatar imagetuannhtn ( 2014-06-26 08:56:53 -0500 )edit

Hey, it is exactly what I need... Thanks a lot!

Bau Miao gravatar imageBau Miao ( 2014-07-01 10:32:55 -0500 )edit
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Asked: 2014-06-26 03:22:15 -0500

Seen: 1,592 times

Last updated: Jun 26 '14