You can replace raster text with vector text either by retyping the text or by using automated text recognition tools.
When retyping the text, you have a choice of two tools:
Once you have entered the text for the Text or Multiline text tools, AutoCAD Raster Design toolset may prompt you to remove the original raster text. Use the VTools General tab of the Raster Design Options dialog box to set the method of removing this text.
AutoCAD Raster Design toolset’s text recognition tools can recognize raster text in an image and convert it to AutoCAD vector text. These tools can recognize both machine-printed and hand-printed text displayed as plain text or text within a table.