NAME

       sane-stv680 - SANE backend for STV680 camera's

DESCRIPTION

       The  sane-stv680 library implements a SANE (Scanner Access Now Easy) backend that provides access to some
       STV680 cameras. This backend should be considered beta-quality software! STV680 cameras  are  sold  under
       various brands like Aiptek.  This backend may or may not support yours.

       The cameras that should work with this backend are:

       Vendor Model              USB vendor id  USB product id  status
       ------------------------  -------------  --------------  --------
       AIPTEK stv680                0x0553         0x0202       basic
       Konica e-mini                0x04c8         0x0722       untested
       DigitalDream l'espion XS     0x1183         0x0001       untested
       Creative WebCam Go mini      0x041e         0x4007       untested

       For all these cameras, see the backend home page (under AUTHOR) for the exact status of each camera.

       For startup of this backend check that if present the stv680 kernel module is removed or disabled.
       Also before using, enable the backend by editing the /etc/sane.d/dll.conf file, change #stv680 to stv680.

       For problems with the untested cameras, you should contact the author for that.

       The  options  the  backend  supports can either be selected through command line options to programs like
       scanimage(1) or through GUI elements in xcam(1).  For both programs use the -B  option  needed  for  size
       buffer.

       Some frontends examples:

       xcam(1)
              xcam -B

       scanimage(1): for writing in batch mode to a file or to a new file each time:

              scanimage -B -d stv680:libusb:001:002 --batch=out.ppm --batch-count 5 --mode "Color RGB"
              scanimage -B -d stv680:libusb:001:002 --batch=out%d.ppm --batch-count 5 --mode "Color RGB"

       If  you  have  any  success with a camera not listed here, or if you observe any strange behavior, please
       report to the backend maintainer or to the SANE mailing list.

       Valid command line options and their syntax can be listed by using:

              scanimage --help -d stv680

       Scan Mode

       --mode selects the basic mode of operation of the webcam's valid choices.

              The read resolution mode is 8 bits, output resolution is 24 bits.  Selects the  resolution  for  a
              scan.  The camera can do only the resolutions listed.

       --Raw  In this mode raw data is displayed

       --Color
              In this mode the bayer unshuffle is done but no color correction

       --Color_RGB
              Bayer unshuffle, color correction

       --Color_RGB_TXT
              Bayer unshuffle, color correction, textline with date and time is added

       Enhancement options

       --white-level-r -32..+32
              Selects  what  red  radiance  level  should  be  considered  "white", when scanning some sheets by
              changing the calibration value loaded into the scanner. Scale -32 .. 0 .. +32 in steps of 1.

       --white-level-g -32..+32
              Selects what green radiance level should be considered  "white",  when  scanning  some  sheets  by
              changing the calibration value loaded into the scanner. Scale -32 .. 0 .. +32 in steps of 1.

       --white-level-b -32..+32
              Selects  what  blue  radiance  level  should  be  considered "white", when scanning some sheets by
              changing the calibration value loaded into the scanner. Scale -32 .. 0 .. +32 in steps of 1.

CONFIGURATION FILE

       The configuration file /etc/sane.d/stv680.conf supports only one item: the device name  to  use  (eg  usb
       0x.... 0x....).

FILES

       /usr/lib/x86_64-linux-gnu/sane/libsane-stv680.a
              The static library implementing this backend.

       /usr/lib/x86_64-linux-gnu/sane/libsane-stv680.so
              The shared library implementing this backend (present on systems that support dynamic loading).

ENVIRONMENT

       SANE_DEBUG_STV680
              If  the  library  was  compiled with debug support enabled, this environment variable controls the
              debug level for this backend. E.g., a value of 128  requests  all  debug  output  to  be  printed.
              Smaller levels reduce verbosity.

LIMITATIONS

       The  windows  TWAIN  driver  has many more options than this SANE backend. However they are only software
       adjustments. This backend only implements what the webcam can support.

BUGS

       Plenty. Parts of this backend are still under development.
              1. Some untested cameras.
              2. Video streaming slow and stops sometimes (scanimage).
              3. Sometimes 1/3 of image is NOK (xcam).

SEE ALSO

       sane(7), sane-usb(5), scanimage(1), xcam(1)

AUTHORS

       Gerard Klaver http://gkall.hobby.nl/stv680-aiptek.html

CREDITS

       Thanks to developers of the other stv680 programs:
              STV680 kernel module
              pencam2 program
              libghoto2(3) program (camlib stv0680)

                                                   11 Jul 2008                                    sane-stv680(5)