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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