[root@yar12 usr]# lsusb
Bus 001 Device 002: ID 04e8:341b Samsung Electronics Co., Ltd SCX-4200 series
...

[root@yar12 usr]# scanimage -L
device `smfp:usb;04e8;341b;8T66BAILC07159B.' is a Samsung SCX-4200 Series on USB Scanner

[korzhikova@yar12 usr]$ sane-find-scanner

  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x067b, product=0x2303) at libusb:003:002
found USB scanner (vendor=0x04a9, product=0x2737) at libusb:001:005
found USB scanner (vendor=0x04e8 [Samsung], product=0x341b [SCX-4200 Series]) at libusb:001:002
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

  # You may want to run this program as root to find all devices. Once you
  # found the scanner devices, be sure to adjust access permissions as
  # necessary.

[korzhikova@yar12 usr]$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

[korzhikova@yar12 usr]$ ls -l /dev/bus/usb/*
/dev/bus/usb/001:
итого 0
crw-rw-r--  1 root root    189, 0 Окт 29  2018 001
crw-rw-rw-+ 1 root lpadmin 189, 1 Окт 29 15:47 002
crw-rw-r--+ 1 root root    189, 4 Окт 29 15:46 005
...

[korzhikova@yar12 usr]$ id
uid=12621(korzhikova) gid=513(Domain Users) группы=513(Domain Users),492(fuse),501(network),502(lpadmin)