kopia lustrzana https://gitlab.com/sane-project/backends
2001-01-17 Tom Martone <tom@martoneconsulting.com>
* backend/bh.c backend/bh.conf backend/bh.h doc/sane-bh.man Added new backend Bell and Howell Copiscan scanners * backend/bh.desc Updated version from (0.1) to 1.0-4 Referenced manpage * backend/Makefile.in Added bh to PRELOADABLE_BACKENDS Added libsane-bh.la dependencies * doc/Makefile.in Added sane-bh.5 to SECT5DEVEL_2_0_BRANCH-1
Tom Martone
rodzic
682d9ae42c
commit
233143a410
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scsi "B&H SCSI"
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/dev/scanner
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@ -10,9 +10,9 @@
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;
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:backend "bh" ; name of backend
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:version "(0.1)" ; version of backend
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:version "1.0-4" ; version of backend
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:status :new ; :alpha, :beta, :stable, :new
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;:manpage "sane-bh" ; name of manpage (if it exists)
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:manpage "sane-bh" ; name of manpage (if it exists)
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:url "http://www.martoneconsulting.com/sane-bh.html" ; backend's web page
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:devicetype :scanner ; start of a list of devices....
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@ -38,7 +38,7 @@ SECT5 = sane-abaton.5 sane-agfafocus.5 sane-apple.5 sane-as6e.5 sane-dll.5 \
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sane-artec.5 sane-fujitsu.5 sane-sharp.5 sane-s9036.5 \
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sane-tamarack.5 sane-ricoh.5 sane-avision.5 sane-plustek.5 \
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sane-st400.5 sane-mustek_pp.5 sane-dc210.5 sane-v4l.5 \
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sane-snapscan.5 sane-canon.5 sane-coolscan.5
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sane-snapscan.5 sane-canon.5 sane-coolscan.5 sane-bh.5
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MANPAGES = $(SECT1) $(SECT5)
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DOCS = sane.ps sane.dvi
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LATEX = TEXINPUTS=$(srcdir):$$TEXINPUTS latex
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.TH sane-bh 5 "15 Sep 1999"
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.IX sane-bh
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.SH NAME
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sane-bh - SANE backend for Bell+Howell Copiscan II series document
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scanners
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.SH DESCRIPTION
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The
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.B sane-bh
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library implements a SANE (Scanner Access Now Easy) backend that
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provides access to Bell+Howell Copiscan II series document
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scanners. The Copiscan II 6338 has been the primary scanner model
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used during development and testing, but since the programming interface
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for the entire series is consistent the backend should work for the
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following scanner models.
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.PP
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.RS
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COPISCAN II 6338 Duplex Scanner with ACE
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.br
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COPISCAN II 2135 Simplex Scanner
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.br
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COPISCAN II 2137(A) Simplex Scanner (with ACE)
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.br
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COPISCAN II 2138A Simplex Scanner with ACE
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.br
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COPISCAN II 3238 Simplex Scanner
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.br
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COPISCAN II 3338(A) Simplex Scanner (with ACE)
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.br
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.RE
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.PP
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If you have a Bell+Howell scanner and are able to test it with this
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backend, please contact
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.IR sane\-devel@mostang.com
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with the model number and testing results. Additionally, the author is
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curious as to the likelihood of using this backend with the newer
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4000 and 8000 series scanners. If you have such a beast, please let
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me know.
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.PP
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The Bell+Howell Copiscan II series document scanners are high
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volume, high throughput scanners designed for document scanning
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applications. As such, they are lineart/grayscale scanners supporting
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a fixed number of fairly low resolutions (e.g. 200/240/300dpi).
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However, they do have a number of interesting and useful features
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suited to needs of document imaging applications.
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This backend attempts to support as many of these features as possible.
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.PP
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The main technical reference used in writing this backend is the
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.B Bell and Howell Copiscan II Remote SCSI Controller (RSC) OEM
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.B Technical Manual Version 1.5.
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The Linux SCSI programming HOWTO, the SANE API documentation, and
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SANE source code were also extremely valuable resources.
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.PP
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The latest backend release, additional information and helpful hints
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are available from the backend homepage:
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.br
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.RS
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.B http://www.martoneconsulting.com/sane-bh.html
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.RE
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.SH "DEVICE NAMES"
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This backend expects device names of the form:
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.PP
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.RS
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.I special
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.RE
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.PP
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Where
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.I special
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is the path-name for the special device that corresponds to a SCSI
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scanner. For SCSI scanners, the special device name must be a generic
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SCSI device or a symlink to such a device. Under Linux, such a device
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name takes a format such as
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.I /dev/sga
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or
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.IR /dev/sg0 ,
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for example. See sane-scsi(5) for details.
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.SH CONFIGURATION
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The contents of the
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.I bh.conf
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file is a list of device names that correspond to Bell+Howell
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scanners. See sane-scsi(5) on details of what constitutes a valid device name.
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Additionally, options can be specified; these lines begin with the word "option".
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Each option is described in detail below. Empty lines and lines starting
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with a hash mark (#) are ignored.
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.SH OPTIONS
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The following options can be specified in the
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.I bh.conf
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file.
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.TP
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.B disable-optional-frames
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This option prevents the backend from sending any optional frames. This
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option may be useful when dealing with frontends which do not support these
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optional frames. When this option is in effect, the data is sent in a
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SANE_FRAME_GRAY frame. The optional frames sent by this backend are:
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SANE_FRAME_G31D, SANE_FRAME_G32D, SANE_FRAME_G42D and SANE_FRAME_TEXT.
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These frames are generated based on the compression and barcode options.
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These frames are never sent in preview mode.
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.TP
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.B fake-inquiry
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This option is used for debugging purposes and its use is not encouraged.
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Essentially, it allows the backend to initialize in the absence of
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a scanner. This is useful for development and not much else.
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This option must be specified earlier in the configuration file than
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the devices which are to be "faked".
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.SH FILES
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.TP
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.I @CONFIGDIR@/bh.conf
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The backend configuration file (see also description of
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.B SANE_CONFIG_DIR
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below).
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.TP
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.I @LIBDIR@/libsane-bh.a
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The static library implementing this backend.
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.TP
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.I @LIBDIR@/libsane-bh.so
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The shared library implementing this backend (present on systems that
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support dynamic loading).
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.SH ENVIRONMENT
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.TP
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.B SANE_CONFIG_DIR
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This environment variable specifies the list of directories that may
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contain the configuration file. Under UNIX, the directories are
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separated by a colon (`:'), under OS/2, they are separated by a
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semi-colon (`;'). If this variable is not set, the configuration file
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is searched in two default directories: first, the current working
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directory (".") and then in @CONFIGDIR@. If the value of the
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environment variable ends with the directory separator character, then
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the default directories are searched after the explicitly specified
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directories. For example, setting
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.B SANE_CONFIG_DIR
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to "/tmp/config:" would result in directories "tmp/config", ".", and
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"@CONFIGDIR@" being searched (in this order).
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.TP
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.B SANE_DEBUG_BH
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If the library was compiled with debug support enabled, this
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environment variable controls the debug level for this backend. E.g.,
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a value of 255 requests all debug output to be printed. Smaller
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levels reduce verbosity.
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.SH "SUPPORTED FEATURES"
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.TP
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.B ADF support
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With document scanners, automatic document feeder (ADF) support is a key
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feature. The backend supports the ADF by default and returns
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.B SANE_STATUS_NO_DOCS
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when the out-of-paper condition is detected. The SANE frontend
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.B scanadf
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is a command line frontend that supports multi-page scans. It has been
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used successfully with this backend. The SANE frontend
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.B xsane
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is an improved GUI frontend by Oliver Rauch. Support for multi-page
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scans is included in xsane version 0.35 and above.
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.TP
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.B Duplex scanning
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Some models, such as the COPISCAN II 6338, support duplex scanning. That
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is, they scan both sides of the document during a single pass through the
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scanner (the scanner has two cameras). This backend supports duplex
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scanning (with the
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.B --duplex
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option). The front and back page images are delivered consecutively
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as if they were separately scanned pages.
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.TP
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.B Hardware compression
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The scanner is capable of compressing the data into several industry
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standard formats (CCITT G3, CCITT G3-2D, CCITT G4). This results in
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increased performance as less data is passed from the scanner to the
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host over the SCSI bus. The backend supports these compression formats
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via the
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.B --g31d, --g32d, --g42d
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options, respectively. Many SANE frontends are not equipped to deal with
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these formats, however. The SANE frontend
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.B scanadf
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supports these optional frame formats. The compressed image data
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is written directly to a file and can then be processed by a scan-script
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using the
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.B --scan-script
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option. Examples of this are given on the scanadf homepage.
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.TP
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.B Automatic Border Detection
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The scanner can automatically detect the paper size and adjust the
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scanning window geometry appropriately. The backend supports this
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useful feature with the
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.B --autoborder
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option. It is enabled by default.
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.TP
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.B Batch Mode Scanning
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The batch scan mode allows for maximum throughput. The Set Window
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parameters must remain constant during the entire batch.
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.TP
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.B Icon Generation
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The Icon function generates a thumbnail of the full page image, that can be
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transferred as if it were a separate page. This allows the host to
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quickly display a thumbnail representation during the scanning operation.
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Perhaps this would be a great way of implementing a preview scan, but
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since a normal scan is so quick, it might not be worth the trouble.
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.TP
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.B Multiple Sections
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Multiple sections (scanning sub-windows) can be defined for the front and
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back pages. Each section can have different characteristics (e.g. geometry,
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compression). The sections are returned as if they were separately
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scanned images. Additionally sections can be used to greatly enhance the
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accuracy and efficiency of the barcode/patchcode decoding process by
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limiting the search area to a small subset of the page. Most Copiscan II
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series scanners support up to 8 user-defined sections.
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.TP
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.B Support Barcode/Patchcode Decoding
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The RSC unit can recognize Bar and Patch Codes of various types embedded
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in the scanned image. The codes are decoded and the data is returned to
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the frontend as a text frame. The text is encoded in xml and contains
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a great deal of information about the decoded data such as the location
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where it was found, its orientation, and the time it took to find.
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Further information on the content of this text frame as well as some
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barcode decoding examples can be found on the backend homepage.
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.SH LIMITATIONS
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.TP
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.B Decoding a single barcode type per scan
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The RSC unit can search for up to six different barcode types at a time.
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While the code generally supports this as well, the
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.B --barcode-search-bar
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option only allows the user to specify a single barcode type.
|
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Perhaps another option which allows a comma separated list of barcode
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type codes could be added to address this.
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.TP
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.B Scanning a fixed number of pages in batch mode
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The separation of front and back end functionality in SANE presents a
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problem in supporting the 'cancel batch' functionality in the scanner.
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In batch mode, the scanner is always a page ahead of the host. The host,
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knowing ahead of time which page will be the last, can cancel batch mode
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prior to initiating the last scan command. Currently, there is no mechanism
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available for the frontend to pass this knowledge to the backend.
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If batch mode is enabled and the --end-count terminates a scanadf session,
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an extra page will be pulled through the scanner, but is niether read
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nor delivered to the frontend. The issue can be avoided by specifying
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--batch=no when scanning a fixed number of pages.
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.TP
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.B Revision 1.2 Patch detector
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There is an enhanced patchcode detection algorithm available in the RSC
|
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with revision 1.2 or higher that is faster and more reliable than the
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standard Bar/Patch code decoder. This is not currently supported.
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.SH OPTIONS
|
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.TP
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.B Scan Mode Options:
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.TP
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.B --preview[=(yes|no)] [no]
|
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Request a preview-quality scan. When preview is set to yes image
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compression is disabled and the image is delivered in a
|
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SANE_FRAME_GRAY frame.
|
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.TP
|
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.B --mode lineart|halftone [lineart]
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Selects the scan mode (e.g., lineart,monochrome, or color).
|
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.TP
|
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.B --resolution 200|240|300dpi [200]
|
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Sets the resolution of the scanned image. Each scanner model supports
|
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a list of standard resolutions; only these resolutions can be used.
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.TP
|
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.B --compression none|g31d|g32d|g42d [none]
|
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Sets the compression mode of the scanner. Determines the type of data
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returned from the scanner. Values are:
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.RS
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.B none
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- uncompressed data - delivered in a SANE_FRAME_GRAY frame
|
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.br
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.B g31d
|
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- CCITT G3 1 dimension (MH) - delivered in a SANE_FRAME_G31D frame
|
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.br
|
||||
.B g32d
|
||||
- CCITT G3 2 dimensions (MR, K=4) - delivered in a SANE_FRAME_G32D frame
|
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.br
|
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.B g42d
|
||||
- CCITT G4 (MMR) - delivered in a SANE_FRAME_G42D frame
|
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.br
|
||||
NOTE: The use of g31d, g32d, and g42d compression values causes the backend
|
||||
to generate optional frame formats which may not be supported by all SANE
|
||||
frontends.
|
||||
.RE
|
||||
|
||||
.TP
|
||||
.B Geometry Options:
|
||||
.TP
|
||||
.B --autoborder[=(yes|no)] [yes]
|
||||
Enable/Disable automatic image border detection. When enabled, the RSC unit
|
||||
automatically detects the image area and sets the window geometry to match.
|
||||
.TP
|
||||
.B --paper-size Custom|Letter|Legal|A3|A4|A5|A6|B4|B5 [Custom]
|
||||
Specify the scan window geometry by specifying the paper size of the
|
||||
documents to be scanned.
|
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.TP
|
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.B --tl-x 0..297.18mm [0]
|
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Top-left x position of scan area.
|
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.TP
|
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.B --tl-y 0..431.8mm [0]
|
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Top-left y position of scan area.
|
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.TP
|
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.B --br-x 0..297.18mm [297.18]
|
||||
Bottom-right x position of scan area.
|
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.TP
|
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.B --br-y 0..431.8mm [431.8]
|
||||
Bottom-right y position of scan area.
|
||||
.TP
|
||||
.B Feeder Options:
|
||||
.TP
|
||||
.B --source Automatic Document Feeder|Manual Feed Tray [Automatic Document Feeder]
|
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Selects the scan source (such as a document feeder). This option is provided
|
||||
to allow multiple image scans with xsane; it has no other purpose.
|
||||
.TP
|
||||
.B --batch[=(yes|no)] [no]
|
||||
Enable/disable batch mode scanning. Batch mode allows scanning at maximum throughput
|
||||
by buffering within the RSC unit. This option is recommended when performing multiple
|
||||
pages scans until the feeder is emptied.
|
||||
.TP
|
||||
.B --duplex[=(yes|no)] [no]
|
||||
Enable duplex (dual-sided) scanning. The scanner takes an image of each side
|
||||
of the document during a single pass through the scanner. The front page is
|
||||
delivered followed by the back page. Most options, such as compression,
|
||||
affect both the front and back pages.
|
||||
.TP
|
||||
.B --timeout-adf 0..255 [0]
|
||||
Sets the timeout in seconds for the automatic document feeder (ADF).
|
||||
The value 0 specifies the hardware default value which varies based
|
||||
on the scanner model.
|
||||
.TP
|
||||
.B --timeout-manual 0..255 [0]
|
||||
Sets the timeout in seconds for semi-automatic feeder. The value 0 specifies
|
||||
the hardware default value which varies based on the scanner model.
|
||||
.TP
|
||||
.B --check-adf[=(yes|no)] [no]
|
||||
Check ADF Status prior to starting scan using the OBJECT POSITION command.
|
||||
Note that this feature requires RSC firmware level 1.5 or higher and dip
|
||||
switch 4 must be in the on position. NOTE: This option has not been tested
|
||||
extensively and may produce undesireable results.
|
||||
.TP
|
||||
.B Enhancement:
|
||||
.TP
|
||||
.B --control-panel[=(yes|no)] [yes]
|
||||
Enables the scanner's control panel for selecting image enhancement
|
||||
parameters. When the option is set to no the following options are
|
||||
used to control image enhancement. See the Bell+Howell scanner users'
|
||||
guide for complete information on ACE functionality.
|
||||
.TP
|
||||
.B --ace-function -4..4 [3]
|
||||
Specify the Automatic Contrast Enhancement (ACE) Function.
|
||||
.TP
|
||||
.B --ace-sensitivity 0..9 [5]
|
||||
Specify the Automatic Contrast Enhancement (ACE) Sensitivity.
|
||||
.TP
|
||||
.B --brightness 0..255 [0]
|
||||
Controls the brightness of the acquired image. Ignored for ACE
|
||||
capable scanners.
|
||||
.TP
|
||||
.B --threshold 0..255 [0]
|
||||
Select minimum-brightness to get a white point. Ignored for ACE
|
||||
capable scanners.
|
||||
.TP
|
||||
.B --contrast 0..255 [inactive]
|
||||
Controls the contrast of the acquired image. This option is not
|
||||
currently used by the scanner (and perhaps never will be).
|
||||
.TP
|
||||
.B --negative[=(yes|no)] [no]
|
||||
Swap black and white, yielding a reverse-video image.
|
||||
.TP
|
||||
.B Icon:
|
||||
.TP
|
||||
.B --icon-width 0..3600pel (in steps of 8) [0]
|
||||
Width of icon (thumbnail) image in pixels.
|
||||
.TP
|
||||
.B --icon-length 0..3600pel (in steps of 8) [0]
|
||||
Length of icon (thumbnail) image in pixels.
|
||||
.TP
|
||||
.B Barcode Options:
|
||||
.TP
|
||||
.B --barcode-search-bar <see list> [none]
|
||||
Specifies the barcode type to search for. If this option is
|
||||
not specified, or specified with a value of none, then the barcode decoding
|
||||
feature is completely disabled. The valid barcode type are:
|
||||
.RS
|
||||
.br
|
||||
.B none
|
||||
.br
|
||||
.B ean-8
|
||||
.br
|
||||
.B ean-13
|
||||
.br
|
||||
.B reserved-ean-add
|
||||
.br
|
||||
.B code39
|
||||
.br
|
||||
.B code2-5-interleaved
|
||||
.br
|
||||
.B code2-5-3lines-matrix
|
||||
.br
|
||||
.B code2-5-3lines-datalogic
|
||||
.br
|
||||
.B code2-5-5lines-industrial
|
||||
.br
|
||||
.B patchcode
|
||||
.br
|
||||
.B codabar
|
||||
.br
|
||||
.B codabar-with-start-stop
|
||||
.br
|
||||
.B code39ascii
|
||||
.br
|
||||
.B code128
|
||||
.br
|
||||
.B code2-5-5lines-iata
|
||||
.br
|
||||
.RE
|
||||
.TP
|
||||
.B --barcode-search-count 1..7 [3]
|
||||
Number of times that the RSC performs the decoding algorithm. Specify
|
||||
the smallest number possible to increase performance. If you are having
|
||||
trouble recognizing barcodes, it is suggested that you increase this option
|
||||
to its maximum value (7).
|
||||
.TP
|
||||
.B --barcode-search-mode <see list> [horiz-vert]
|
||||
Chooses the orientation of barcodes to be searched. The valid orientations
|
||||
are:
|
||||
.RS
|
||||
.br
|
||||
.B horiz-vert
|
||||
.br
|
||||
.B horizontal
|
||||
.br
|
||||
.B vertical
|
||||
.br
|
||||
.B vert-horiz
|
||||
.RE
|
||||
.TP
|
||||
.B --barcode-hmin 0..1660mm [5]
|
||||
Sets the barcode minimum height in millimeters (larger values increase
|
||||
recognition speed). Of course the actual barcodes in the document must be
|
||||
of sufficient size.
|
||||
.TP
|
||||
.B --barcode-search-timeout 20..65535us [10000]
|
||||
Sets the timeout for barcode searching in milliseconds. When the timeout
|
||||
expires, the decoder will stop trying to decode barcodes.
|
||||
.TP
|
||||
.B --section <string> []
|
||||
Specifies a series of image sections. A section can be used to gather
|
||||
a subset image or to provide a small area for barcode decoding.
|
||||
Each section is specified in the following format (units are in millimeters):
|
||||
.PP
|
||||
.B <width>x<height>+<top-left-x>+<top-left-y>[:functioncode...]
|
||||
.PP
|
||||
Multiple sections can be specified by separating them with commas.
|
||||
.PP
|
||||
For example
|
||||
.B 76.2x25.4+50.8+0:frontbar
|
||||
identifies an area 3 inches wide and 1 inch high with a top left corner
|
||||
at the top of the page two inches from the left hand edge of the page.
|
||||
This section will be used for barcode decoding on the front page only.
|
||||
.PP
|
||||
For example
|
||||
.B 50.8x25.4+25.4+0:frontbar:front:g42d
|
||||
identifies an area 2 inches wide and 1 inch high with a top left corner
|
||||
at the top of the page one inch from the left hand edge of the page.
|
||||
This section will be used for barcode decoding on the front page as well
|
||||
as generating an image compressed in g42d format.
|
||||
.PP
|
||||
Ordinarily barcodes are searched in the entire image. However, when you
|
||||
specify sections all barcode searching is done within the specific sections
|
||||
identified. This can significantly speed up the decoding process.
|
||||
|
||||
The following functioncodes are available:
|
||||
.RS
|
||||
.br
|
||||
.B front
|
||||
- generate an image for the front page section
|
||||
.br
|
||||
.B back
|
||||
- generate an image for the back page section
|
||||
.br
|
||||
.B frontbar
|
||||
- perform barcode search in front page section
|
||||
.br
|
||||
.B backbar
|
||||
- perform barcode search in back page section
|
||||
.br
|
||||
.B frontpatch
|
||||
- perform patchcode search in front page section
|
||||
.br
|
||||
.B backpatch
|
||||
- perform patchcode search in back page section
|
||||
.br
|
||||
.B none
|
||||
- use no image compression
|
||||
.br
|
||||
.B g31d
|
||||
- use Group 3 1 dimension image compression
|
||||
.br
|
||||
.B g32d
|
||||
- use Group 3 2 dimensions image compression
|
||||
.br
|
||||
.B g42d
|
||||
- use Group 4 2 dimensions image compression
|
||||
.br
|
||||
.RE
|
||||
.PP
|
||||
If you omit a compression functioncode, the full page compression setting
|
||||
is used. If you specify multiple compression functioncodes, only the
|
||||
last one is used.
|
||||
|
||||
.TP
|
||||
.B --barcode-relmax 0..255 [0]
|
||||
Specifies the maximum relation from the widest to the smallest bar.
|
||||
.TP
|
||||
.B --barcode-barmin 0..255 [0]
|
||||
Specifies the minimum number of bars in Bar/Patch code.
|
||||
.TP
|
||||
.B --barcode-barmax 0..255 [0]
|
||||
Specifies the maximum number of bars in a Bar/Patch code.
|
||||
.TP
|
||||
.B --barcode-contrast 0..6 [3]
|
||||
Specifies the image contrast used in decoding. Use higher values when
|
||||
there are more white pixels in the code.
|
||||
.TP
|
||||
.B --barcode-patchmode 0..1 [0]
|
||||
Controls Patch Code detection.
|
||||
|
||||
.SH BUGS
|
||||
This is a new backend; detailed bug reports are welcome -- and expected ;)
|
||||
.PP
|
||||
If you have found something that you think is a bug, please attempt to
|
||||
recreate it with the SANE_DEBUG_BH environment variable set to
|
||||
255, and send a report detailing the conditions surrounding the bug to
|
||||
.IR sane\-devel@mostang.com .
|
||||
|
||||
.SH "SEE ALSO"
|
||||
sane\-scsi(5), scanimage(1), scanadf(1)
|
||||
|
||||
.SH AUTHOR
|
||||
The sane-bh backend was written by Tom Martone, based on the sane-ricoh
|
||||
backend by Feico W. Dillema and the bnhscan program by Sean Reifschneider
|
||||
of tummy.com ltd.
|
||||
Ładowanie…
Reference in New Issue