High performant image preprocessing The Preprocessing license provides vTools for arithmetic operations as well as smoothing and morphology operations on images. With these high performance algorithms image features can be enhanced, masked or weakened, to improve and optimize for further image processing steps.pylon vTools are part of Basler's pylon Software Suite. Licenses for pylon vTools can be protected by hardware dongles. If you want to run multiple systems with pylon vTools at the same time, you will need one dongle for each system.