Not sure if you want the image cleaned up or a pattern from the image. Edzbaker cleaned it up, I extracted the PDF, and make a pattern, just in case that is what you wanted.
Using Designer 1.187, STL importer, Center line, conforming vectors, scanning probe/PE, and the ROCK chuck.
The problem is that the original artwork is not very good. Can you get a larger, sharper copy of the image that is NOT a JPG file (and has never been a JPG.) The JPG compression process causes a loss of definition on sharp edges. If you start with a higher resolution original than you'll be able to make a lot better pattern.
I tried cleaning it up a bit with just "Paint.Net" -- Like mentioned above being a jpg file,
a higher resolution picture png file would be easier to work with.
Ken
Ver 1.182 on XL Pro plus Ver 1.164 and 1.175 on Windows 7 Ultimate It Never Fails * Till * You Say It Never Fails