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The best way is to create a orientated band pass filter and filter the image with it. I made an online app where you can play around with FFT filters called 'Fourifier'

http://www.ejectamenta.com/Imaging-Experiments/fourierimagefiltering.html

This approach is also used with Steerable Filters, see the work of Freeman, Adelson, Castleman for example

http://people.csail.mit.edu/billf/publications/Design_and_Use_of_Steerable_Filters.pdf

http://www.tka4.org/materials/lib/Articles-Books/Filters/Steerable/Simplified%20Design%20of%20Steerable%20Pyramid%20Filters%20-%20Castleman,%20Schulze,%20Wu%20(ResearchIndex).htm

You can also get the orientations directly from a steerable filter, look at page 17 of

http://persci.mit.edu/pub_pdfs/freeman_steerable.pdf

The best way is to create a orientated band pass filter and filter the image with it. I made an online app where you can play around with FFT filters called 'Fourifier'

http://www.ejectamenta.com/Imaging-Experiments/fourierimagefiltering.html

This approach is also used with Steerable Filters, see the work of Freeman, Adelson, Castleman for example

http://people.csail.mit.edu/billf/publications/Design_and_Use_of_Steerable_Filters.pdf

http://www.tka4.org/materials/lib/Articles-Books/Filters/Steerable/Simplified%20Design%20of%20Steerable%20Pyramid%20Filters%20-%20Castleman,%20Schulze,%20Wu%20(ResearchIndex).htm

You can also get the orientations directly from a steerable filter, look at page 17 of

http://persci.mit.edu/pub_pdfs/freeman_steerable.pdf