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I also have an avision-based scanner (Xerox DocuMate 510), and encountered the reported issue with the version of sane-utils in wheezy.

I downloaded the later version of the package source from unstable, built the package, and verified it resolved the problem.

kbare@musicality:~$ scanimage -L
device `v4l:/dev/video0' is a Noname BT878 video (Hauppauge (bt878)) virtual device
device `avision:libusb:002:012' is a Xerox DocuMate510-G flatbed scanner

kbare@musicality:~$ scanimage -d avision --help
Usage: scanimage [OPTION]...

Start image acquisition on a scanner device and write image data to
standard output.

Parameters are separated by a blank from single-character options (e.g.
-d epson) and by a "=" from multi-character options (e.g. --device-name=epson).
-d, --device-name=DEVICE   use a given scanner device (e.g. hp:/dev/scanner)
    --format=pnm|tiff      file format of output file
-i, --icc-profile="" include this ICC profile into TIFF file
-L, --list-devices         show available scanner devices
-f, --formatted-device-list=FORMAT similar to -L, but the FORMAT of the output
                           can be specified: %d (device name), %v (vendor),
                           %m (model), %t (type), %i (index number), and
                           %n (newline)
-b, --batch[=FORMAT]       working in batch mode, FORMAT is `out%d.pnm' or
                           `out%d.tif' by default depending on --format
    --batch-start=#        page number to start naming files with
    --batch-count=#        how many pages to scan in batch mode
    --batch-increment=#    increase page number in filename by #
    --batch-double         increment page number by two, same as
    --batch-prompt         ask for pressing a key before scanning a page
    --accept-md5-only      only accept authorization requests using md5
-p, --progress             print progress messages
-n, --dont-scan            only set options, don't actually scan
-T, --test                 test backend thoroughly
-A, --all-options          list all available backend options
-h, --help                 display this help message and exit
-v, --verbose              give even more status messages
-B, --buffer-size=#        change input buffer size (in kB, default 32)
-V, --version              print version information

Options specific to device `avision':
  Scan mode:
    --mode Lineart|Dithered|Gray|Color [Color]
        Selects the scan mode (e.g., lineart, monochrome, or color).
    --resolution 75..600dpi (in steps of 1) [150]
        Sets the resolution of the scanned image.
    --speed 0..4 (in steps of 1) [0]
        Determines the speed at which the scan proceeds.
    --preview[=(yes|no)] [no]
        Request a preview-quality scan.
    --source Normal|ADF Front [Normal]
        Selects the scan source (such as a document-feeder).
    -l 0..216mm [0]
        Top-left x position of scan area.
    -t 0..297mm [0]
        Top-left y position of scan area.
    -x 0..216mm [216]
        Width of scan-area.
    -y 0..297mm [297]
        Height of scan-area.
    --overscan-top 0..4mm [inactive]
        The top overscan controls the additional area to scan before the paper
        is detected.
    --overscan-bottom 0..4mm [inactive]
        The bottom overscan controls the additional area to scan after the
        paper end is detected.
    --background-lines 0..50pel [inactive]
        The background raster controls the additional background lines to scan
        before the paper is feed through the scanner.
    --brightness -100..100% (in steps of 1) [0]
        Controls the brightness of the acquired image.
    --contrast -100..100% (in steps of 1) [0]
        Controls the contrast of the acquired image.
    --quality-scan[=(yes|no)] [yes]
        Turn on quality scanning (slower but better).
    --quality-cal[=(yes|no)] [yes]
        Do a quality white-calibration
    --gamma-table 0..255,... [inactive]
        Gamma-correction table.  In color mode this option equally affects the
        red, green, and blue channels simultaneously (i.e., it is an intensity
        gamma table).
    --red-gamma-table 0..255,...
        Gamma-correction table for the red band.
    --green-gamma-table 0..255,...
        Gamma-correction table for the green band.
    --blue-gamma-table 0..255,...
        Gamma-correction table for the blue band.
    --exposure 0..1000% (in steps of 1) [inactive]
        Manual exposure adjustment.
    --infra-red[=(yes|no)] [inactive]
        Enable infra-red scan mode.
    --multi-sample[=(yes|no)] [inactive]
        Enable multi-sample scan mode.
  Scan mode:
    --frame 0..0 [inactive]
        Selects the number of the frame to scan
    --power-save-time <int> [15]
        Allows control of the scanner's power save timer, dimming or turning
        off the light.
    --paper-length[=(yes|no)] [inactive]
        Newer scanners can utilize this paper length to detect double feeds.
        However some others (DM152) can get confused during media flush if it
        is set.
    --flip-page[=(auto|yes|no)] [inactive]
        Tells page-flipping document scanners to flip the paper back to its
        original orientation before dropping it in the output tray.  Turning
        this off might make scanning a little faster if you don't care about
        manually flipping the pages afterwards.

Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.

List of available devices:
    v4l:/dev/video0 avision:libusb:002:012

kbare@musicality:~$ dpkg -l sane-utils
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
ii  sane-utils     1.0.23-3     amd64        API library for scanners -- utili


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