Essentially my question is how I can use the functions getImage() and getReply()
getImage() in the library is an implementation of the 0x01 command which is described like this in the manual:
6.2.1 To collect finger image: GenImg
Description: detecting finger and store the detected finger image in ImageBuffer while
returning successfull confirmation code; If there is no finger, returned
confirmation code would be ¡ can¡t detect finger¡ .
Uploading the image from the sensor would be the 0x0A command. We did not have this level of English language documentation at the time the library was written, so we currently do not have library support for this function.