There is a GOOD software for this purpose. Name is SCAN2CAD, you can vectorize any raster or PDF. If your PDF is already a Vector drawing, you can translate into DWG, DXF or some other which I cannot remember. If you have non non-vector PDF or a raster, it also converts the lines into vectors, like lines, curves, splines etc, it can also recognize dotted lines, hatches etc. From a raster or non-vector PDF, the scan has to be clean and good. I cannot describe what is clean and/or good here, you have to try and find out. Before conversion you have to perform several operations on the image like converting to black/white (no grey scale), cleaning speckles and holes, thinning or thickening lines, smoothing the pixels, etc etc. I am not using it for the last 7 or 8 years because it is expensive, but I have made a lot of succesfull conversions.
Attached you will find a ship plan page found from internet and its conversion as DXF. The attached conversion is without any correction. You have to clean and correct some shapes, you can do this also on SCAN2CAD with vector superposed on raster. Some part of DXF is removed for copyright purposes.
I cannot remember exatly but you can download and use a trial version for one or two weeks with full functions.4.dxf delete.dxf
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JPG to CAD
