Hi Stefan, Here is *one link of patent application* I just found out (I am not sure if it is proof for whether it is patented. I don't know much about patents, but I think you will understand it) : http://www.faqs.org/patents/app/20090285482 Long back, I have seen a video its author presenting SWT in a conference, and a question came from audiance about its source code, He replied "come to Microsoft, you will get the code". "Otherwise?", "It is not upto me" Please *watch last one minute of this video* : http://videolectures.net/cvpr2010_epshtein_dtns/ Some two years back, when I first saw this paper, I had a plan to implement it (and contribute to OpenCV actually). So while gathering more information about this, I saw this video, and I assumed it is patented and OpenCV won't take it. So left the plan there. And I think that may be the reason *OpenCV went after another (newer - CVPR 2012) algorithm for same* : http://cmp.felk.cvut.cz/~neumalu1/neumann-cvpr2012.pdf Regards Abid K. On Mon, Feb 17, 2014 at 7:22 PM, Stéfan van der Walt <stefan@sun.ac.za>wrote:

Hi Abid

On Sun, Feb 16, 2014 at 5:58 PM, abid rahman <abidrahman2@gmail.com> wrote:

...

One question. Isn't stroke width transform patented by microsoft research?

I haven't seen any indication that it is; could you provide me with a reference?

Stéfan

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