# GaborFilter for pattern extraction

I am trying to use the GaborFilter to extract features such as pixel clusters forming straight lines in a specific direction from images. How ever the Gabor filter is proving hard for me to understand even though I have been trying hard to read about it. Please use this sample image to extract only vertical lines with a tolerance of about 20 degrees. I have tried it by doing trial and error and I am getting close to favorable results, but I am unable to control the tolerance and feel like I don't realy understand how the filter is working. I would really appreciate it if you could give me brief tips on how to control the filter and the tolerance. Here is the picture I used and the out put I got from my code after processing to extract only vertical lines ColorReplace[GaborFilter[i3, 6, {0, 1}, 6] // ImageAdjust, Gray]

Thank you very much for your help.

Manipulate[
ColorReplace[GaborFilter[i3, rr, {0, ss}, jj] // ImageAdjust, Gray],
{rr, 1, 10},
{jj, 1, 10},
{ss, 1, 10}]

• Thank you. This helps with trial and error. But I am still not sure how the filter works, so that I can do accurate work. – Shriram Bobbili Aug 2 '17 at 19:47
• One performs a convolution with Gabor filters of different parameters. Look on wikipedia or any site describing the process. – David G. Stork Aug 2 '17 at 19:48