Actually I'm working in a Legal firm, where we trace the images to CAD file through AutoCAD for specific patents. Is there any other software, which is easier to use or faster?
If you Google "Raster to Vector Freeware" you will find several options that might help you get where you want to go.
Sounds like a segmentation problem (exacting boundaries and edges from an image).There are numerous python and matlab codes available which perform active contour, level set, snakes, watershed, etc. segmentation. None of which are 100% accurate. They might give you a good starting point for additional user-defined modifications.
Try SCAN2CAD or just like suggest above, google a freeware for it. you could try IMAGEATTACH to get an image into your dwg and then just trace over it with a line, polyline etc. it is painfully slow though, especially if you have complex drawings - but you can control the accuracy and ensure you trace out what you need.
I would rather suggest SW or NX.These softwares can do it better.
If you want to extract the boundaries and edges from an image CorelDraw is a good choice also. How complex are the images?
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