You don't. In general, whenever you need to go from raster to vector you have to do it by hand. I'd guess that there isn't a program to take bitmap fonts and convert them to TrueType without some, or ...

Pixel fonts represent an interesting era of type design. They were born out of necessity when low-res displays were the only ones around, and have now become a highly niche style of retro nostalgia.

EVEN as the web scintillates in a rainbow of colours, digital fonts persist in a monochromatic past resembling the long-gone era of wood and metal type. This may at last be about to change. A new ...