Converting a bitmap into a vector diagram can be realized by PhotoShop, and the steps are as follows (from scanning):

1. Scan the original pattern with a scanner in true color mode of 300dpi, save it in TIF format, then close the file, and then start PhotoShop to open the just-scanned picture file.

2. Click the "Color Range" command under the "Selection" menu to create a selection on the image and filter out all parts containing signature handwriting.

3. Convert the established selection into a track.

4. Select the command "Path to Illustrator" under the "Export" option in the "File" menu to export the trajectory and save it with the extension of AI (if you want to use the converted vector diagram in 3DS, you can export the trajectory to DXF format).

In this way, the conversion from bitmap to vector diagram is completed.