Raster to .dxf. This is posible?

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Hoy to convert raster images (from exsample Inskape format or Adobe Ilustrator or ade) in .dxf for working in Qcad with lines? About buton "Insert image" I know, a want no this, I want work witsh rastered lines, converted in .dxf (Qcad format).

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Or I want convert image in jpg or ade after scaning in .dxf to work in Qcad with lines from image. I want freeware program, I know only shareware.

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In this time I using Google and know 3:
http://www.easytrace.com/site/russian/easytracepro/download.html About Inglish version I don't know, Russian avialable is free.
http://wintopo.com/ Avialable free version.

http://sourceforge.net/projects/autotrace/ It's old yeads ago (2002).

I don't know about .dxf in this program in this moment, I posible testing after.