DMTXREAD(1)						      General Commands Manual						       DMTXREAD(1)

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 bar-
       codes, 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 sin-
	      gle 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 above pixel row N (or N%).

       -Y, --y-range-max=N[%]
	      Do not scan pixels below 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

								 September 4, 2009						       DMTXREAD(1)