Section: SANE Scanner Access Now Easy (5)
Updated: 14 Jul 2008
sane-qcam - SANE backend for Connectix QuickCam cameras
library implements a SANE (Scanner Access Now Easy) backend that
provides access Connectix QuickCam cameras.
This backend expects device names of the form:
is the I/O port address at which the device resides. This address is
normally specified in hexadecimal using C syntax (e.g., 0x37b) and may
be prefixed with the letter "u" (e.g., u0x37b) to force the backend to
access the camera in uni-directional mode.
The contents of the
file is a list port addresses that may be connected to a
Connectix QuickCam. Empty lines and everything starting from a hash
mark (#) up to the end of a line are ignored. A sample configuration
file is shown below:
0x37b # /dev/lp0
0x378 # /dev/lp1
u0x278 # /dev/lp2 forced in uni-directional mode
0x3bc # /dev/lp0 (alternate address)
In general, it is safest to list only the port addresses that really
correspond to a QuickCam. For example, if one of the listed addresses
actually connect to a printer, then starting up this backend will
cause the printer to perform a device reset (which is generally
The backend configuration file (see also description of
The static library implementing this backend.
The shared library implementing this backend (present on systems that
support dynamic loading).
This environment variable specifies the list of directories that may
contain the configuration file. Under UNIX, the directories are
separated by a colon (`:'), under OS/2, they are separated by a
semi-colon (`;'). If this variable is not set, the configuration file
is searched in two default directories: first, the current working
directory (".") and then in
If the value of the
environment variable ends with the directory separator character, then
the default directories are searched after the explicitly specified
directories. For example, setting
to "/tmp/config:" would result in directories
being searched (in this order).
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.
Support is currently limited to the color version of the QuickCam.
The black-and-white camera is starting to work too, but I don't
believe it works in all cases yet. Reportedly, acquiring images of
certain sizes work fine, but others result in shifted images (sounds
like a problem due to byte-padding).
The program needs root-privileges since it needs to be able to access
the camera's I/O ports.