NAME

       dmtxread - scan Data Matrix barcodes

SYNOPSIS

       dmtxread [options] [FILE]...

DESCRIPTION

       dmtxread  searches  the named input FILEs (or standard input if no files are named or the filename "-" is
       given) for ECC200 Data Matrix barcodes, reads their contents, and writes the decoded messages to standard
       output.

OPTIONS

       -c, --codewords
              Only print the codewords extracted from a Data Matrix, and not the actual decoded message.

       -e, --minimum-edge=N
              Pixel length of smallest expected edge in image.

       -E, --maximum-edge=N
              Pixel length of largest expected edge in image.

       -g, --gap=N
              Use scan grid with gap of N pixels (or less) between lines.

       -l, --list-formats
              List the supported input image formats.

       -m, --milliseconds=N
              Stop scan after N milliseconds (per image).

       -n, --newline
              Print a newline character at the end of decoded data.

       -p, --page=N
              Only scan Nth page of images.

       -q, --square-deviation=N
              Maximum deviation (degrees) from squareness between adjacent barcode sides. Default value is N=40,
              but N=10 is recommended for flat applications like faxes  and  other  scanned  documents.  Barcode
              regions found with corners <(90-N) or >(90+N) will be ignored by the decoder.

       -r, --resolution=N
              Decoding resolution in dots per inch (DPI). Only used for vectorial input images such as SVG, PDF,
              etc...  This  option  accepts  a  single  argument  (eg:  300)  as well as horizontal and vertical
              resolutions (eg: 300x150). The default resolution is 72dpi.

       -s, --symbol-size=[asr|RxC]
              Only consider barcodes of specific size or shape.
                 a = All sizes     [default]
                 s = Only squares
                 r = Only rectangles
               RxC = Exactly this many rows and columns (10x10, 8x18, etc...)

       -t, --threshold=N
              Set the minimum edge threshold as a percentage of maximum. For example, an  edge  between  a  pure
              white  and  pure  black  pixel  would  have  an intensity of 100. Edges with intensities below the
              indicated threshold will be ignored by the decoding process. Lowering the threshold will  increase
              the amount of work to be done, but may be necessary for low contrast or blurry images.

       -x, --x-range-min=N[%]
              Do not scan pixels to the left of pixel column N (or N%).

       -X, --x-range-max=N[%]
              Do not scan pixels to the right of pixel column N (or N%).

       -y, --y-range-min=N[%]
              Do not scan pixels below pixel row N (or N%).

       -Y, --y-range-max=N[%]
              Do not scan pixels above pixel row N (or N%).

       -C, --corrections-max=N
              Correct at most N errors per image (0 = correction disabled).

       -D, --diagnose
              Make copy of image with additional diagnostic data.

       -M, --mosaic (experimental)
              Interpret detected regions as Data Mosaic barcodes.

       -N, --stop-after=N
              Stop scanning after Nth barcode is returned.

       -P, --page-numbers
              Print each decoded message with its fax/tiff page number.

       -R, --corners
              Prefix the decoded message with the barcode's corner locations.

       -S, --shrink=N
              Internally  shrink  image  by  factor  of N. Shrinking is accomplished by skipping N-1 pixels at a
              time, often producing significantly faster scan times. It also  improves  scan  success  rate  for
              images taken with poor camera focus provided the image is sufficiently large.

       -U, --unicode
              Print Extended ASCII characters in UTF-8 Unicode.

       -v, --verbose
              Use verbose messages.

       -V, --version
              Print program version information.

       --help Display this help message and quit.

STANDARDS

       ISO/IEC 16022:2000

       ANSI/AIM BC11 ISS

DIAGNOSTICS

       Exit status has following possible meanings:
          0  At least one barcode was found and decoded
          1  No barcodes were found
         >1  Error occurred that prevented command from executing normally

BUGS

       Email bug reports to mike@dragonflylogic.com

AUTHOR

       Copyright (C) 2008, 2009 Mike Laughton

                                                  June 2, 2011                                       DMTXREAD(1)