DMTXREAD(1) 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 stan-
dard 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 vecto-
rial 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 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 accom-
plished by skipping N-1 pixels at a time, often producing sig-
nificantly 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)
