How to trace a line drawing image to be a “”real line“ vector drawing instead of a outline image?

[iarch]

@laurent_delrieu

Vextracto

I try all the 5 tools and I believe that AI still be the best one which could do the both “single line” and “outline” vectorize things. However Wintopo is a quick one and free. Please see the comparison of this two.

Thank you!