---------- Ursprüngliche Nachricht ----------
Von: Michael Dittmer
An: "[email protected]"
<[email protected]>
Datum: 23.08.2020 12:00
Betreff: book scanner recognized as v4l device
I bought a book scanner
JOURIST BT16
from a german dealer
looks like:
http://www.scanner.expert/de/images/products/buchscanner/description/5_JOURIST_Buchscanner_BS16_Standalone.jpg
It takes photos from the pages with a camera like a CZUR book scanner.
My bookscanner camera also can be opened by
guvcview
It has maximum resolution of
4608x3456
pixels for A3 scan (resolution can be selected by gucview and is shown
later when starting xsane).
When I plug it onto a usb port, several devices are recognized (dmesg
output)
[ 1377.446137] usb 1-5: new high-speed USB device number 8 using xhci_hcd
[ 1377.467545] usb 1-5: New USB device found, idVendor=2b19,
idProduct=0200, bcdDevice= 1.50
[ 1377.467551] usb 1-5: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 1377.467554] usb 1-5: Product: JY-VP216
[ 1377.467557] usb 1-5: Manufacturer: YHW
[ 1377.467560] usb 1-5: SerialNumber: 35060591
[ 1377.646815] uvcvideo: Found UVC 1.00 device JY-VP216 (2b19:0200)
[ 1377.654409] uvcvideo: UVC non compliance - GET_DEF(PROBE) not
supported. Enabling workaround.
[ 1377.656783] uvcvideo 1-5:1.2: Entity type for entity Processing 3 was
not initialized!
[ 1377.656789] uvcvideo 1-5:1.2: Entity type for entity Extension 2 was
not initialized!
[ 1377.656795] uvcvideo 1-5:1.2: Entity type for entity Camera 1 was not
initialized!
[ 1377.662373] input: YHW JY-VP216 as
/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.4/0003:2B19:0200.0008/input/input24
[ 1377.722925] hid-generic 0003:2B19:0200.0008: input,hidraw0: USB HID
v1.10 Keyboard [YHW JY-VP216] on usb-0000:00:14.0-5/input4
All book scanner manufacturers seem to deliver only twain drivers. So I
tried to handle the scanner as an generic v4l device
My linux mint 19.3 (based on Ubuntu 18.04) distribution has a sane
backend package (1.0.27) without compiled v4l backend.
After compiling current 1.0.30 sources with v4l-dev libraries I obtained
the v4l backend
scanimage --list-devices
device `v4l:/dev/video3' is a Noname JY-VP216: JY-VP216 virtual device
but xsane and scanimage are not able to perform scan ("illegal argument")
SANE_DEBUG_SANEI_USB=4 scanimage -v -d v4l:/dev/video3 --format tiff
>output.tif scanimage: ignored request to set inactive option br-x
scanimage: ignored request to set inactive option br-y
scanimage: sane_start: Invalid argument
Another program
simple scan
from Ubuntu distribution is able to scan into pdf with 1600x1200 pixel
but not with maximum resolution.
It seems for me that the v4l backend has to support higher resolutions,
like 4608x3456 e.g.
