Zbar 大图像分析

博客转载自：https://blog.csdn.net/sunflower_boy/article/details/50429252

为了减少处理时间，可以设定更大的扫描间距，减少不必要的解码类型，去除位置记录：zbarimg -Sdisable -Scode128.enable -Sno-position -Sx-density=0 -Sy-density=10 160220206.jpg。在ubuntu系统下，jpg格式并不比bmp格式更耗时，可能是因为bmp格式图片太大，载入耗了太多时间。

测试过程:

测试条件

测试图像：2560x1920pixels
联想 IdeaPad Z470
英特尔 Core i3-2310M @ 2.10GHz 双核
2 GB ( 三星 DDR3 1333MHz )
Ubuntu 15.04　　

测试程序

import re
import commands
picname = '1553520702.jpg'
regex = re.compile(r'\d+\.?\d*\sseconds')
f=open('timeresult.txt','w')  

cmdlist = ['zbarimg ',
           'zbarimg -Sdisable -Scode128.enable ',
           'zbarimg -Sno-position ',
           'zbarimg -Sy-density=10 ',
           'zbarimg -Sy-density=20 ',
           'zbarimg -Sy-density=40 ',
           'zbarimg -Sy-density=10 -Sx-density=10 ',
           'zbarimg -Sy-density=10 -Sx-density=20 ',
           'zbarimg -Sy-density=10 -Sx-density=40 ',
           'zbarimg -Sy-density=10 -Sx-density=0 ',
           'zbarimg -Sy-density=20 -Sx-density=0 ',
           'zbarimg -Sy-density=40 -Sx-density=0 ',
           'zbarimg -Sy-density=40 -Sx-density=0 \
-Sdisable -Scode128.enable -Sno-position ',
          ]
for i in range(len(cmdlist)):
   cmdstr = cmdlist[i] + picname
   print cmdstr+':'
   f.write(cmdstr+':')
   for j in range(1,6):
     cmdout = commands.getoutput(cmdstr)
     timelist = regex.findall(cmdout)
     if timelist:
        timestr = timelist[0]
        timestr = timestr[:len(timestr)-7]
     else:
        timestr = '-1'
     print timestr
     f.write(timestr)
   print  '\n'
   f.write('\n')  

f.close() 　　

输出结果

zbarimg .jpg:0.63 0.61 0.59 0.62 0.6
zbarimg -Sdisable -Scode128.enable .jpg:0.56 0.61 0.55 0.56 0.55
zbarimg -Sno-position .jpg:0.59 0.6 0.62 0.6 0.62
zbarimg -Sy-density= .jpg:0.42 0.43 0.41 0.42 0.42
zbarimg -Sy-density= .jpg:0.42 0.4 0.41 0.41 0.4
zbarimg -Sy-density= .jpg:0.4 0.4 0.42 0.4 0.39
zbarimg -Sy-density= -Sx-density= .jpg:0.2 0.2 0.21 0.23 0.21
zbarimg -Sy-density= -Sx-density= .jpg:0.2 0.2 0.19 0.19 0.21
zbarimg -Sy-density= -Sx-density= .jpg:0.19 0.2 0.21 0.2 0.19
zbarimg -Sy-density= -Sx-density= .jpg:0.18 0.18 0.18 0.18 0.18
zbarimg -Sy-density= -Sx-density= .jpg:0.17 0.17 0.17 0.18 0.16
zbarimg -Sy-density= -Sx-density= .jpg:0.16 0.16 0.17 0.16 0.16
zbarimg -Sy-density= -Sx-density= -Sdisable -Scode128.enable -Sno-position .jpg:0.16 0.16 0.16 0.16 0.17  

man zbarimg查看配置信息

ZBARIMG(1)                    ZBar Barcode Reader                   ZBARIMG(1)  

NAME
       zbarimg - scan and decode bar codes from image file(s)  

SYNOPSIS
       zbarimg [-qv] [--quiet] [--verbose[=n]]
               {-dD | --display | --nodisplay | --xml | --noxml |
               -S[symbology.]config[=value] | --set [symbology.]config[=value]
               | image...}  

       zbarimg {-h | --help | --version}  

DESCRIPTION
       For each specified image file zbarimg scans the image for bar codes and
       prints any decoded data to stdout. Images may optionally be displayed
       to the screen.  

       The underlying library currently supports EAN-13 (including UPC and
       ISBN subsets), EAN-8, Code 128, Code 39, and Interleaved 2 of 5
       symbologies. The specific type of each detected symbol is printed with
       the decoded data.  

       Note that "image" in this context refers to any format supported by
       ImageMagick, including many vector formats such as PDF and PostScript.
       Keep in mind that vector formats are rasterized before scanning;
       manually rasterize vector images before scanning to avoid
       unintentionally corrupting embedded barcode bitmaps.  

OPTIONS
       This program follows the usual GNU command line syntax. Single letter
       options may be bundled, long options start with two dashes (`-´).  

       -h, --help
           Print a short help message describing command line options to
           standard output and exit  

       --version
           Print program version information to standard output and exit  

       -v, --verbose[=n]
           Increase debug output level. Multiple -v options create more spew.
           Alternatively specify n to set the debug level directly  

       -S[symbology.]config[=value], --set [symbology.]config[=value]
           Set decoder configuration option config for symbology to value.
           value defaults to 1 if omitted.  symbology is one of ean13, ean8,
           upca, upce, isbn13, isbn10, i25, code39, code128 or the special
           value *. If symbology is omitted or *, the config will be set for
           all applicable symbologies. These are the currently recognized
           configs. Prefix a config with "no-" to negate it. Not all configs
           are appropriate for every symbology.  

           enable
               Control decoding/reporting of a symbology. For symbologies
               which are just subsets of ean13 (upca, upce, isbn13, isbn10),
               this config controls whether the subsets are detected and
               reported as such. These special cases are disabled by default,
               all other symbologies default to enabled  

           disable
               Antonym for enable  

           emit-check
               Control whether check digits are included in the decoded
               output. Enabled by default. This config does not apply for
               code128, which never returns the check digit. It also not apply
               for cases where the check digit is disabled (see add-check).
               Check digits are currently not implemented for i25 or code39  

           add-check
               Enable decode and verification of a check digit for symbologies
               where it is optional: this will include code39 and i25, neither
               of which implements the check digit yet  

           ascii
               Enable escape sequences that encode the full ASCII character
               set. This would apply to code39, except that it´s not
               implemented either...  

           position
               Enable collection of symbol position information. Enabled by
               default. Currently, the position information is unusable, so
               you can save a few cycles by disabling this.  

           min-length=n, max-length=n
               Bound the number of decoded characters in a valid symbol. If a
               decode result is outside the configured min/max range
               (inclusive), it will not be reported. Set to 0 to disable the
               corresponding check. This setting applies to variable-length
               symbologies: i25, code39, code128 and pdf417.  min-length
               defaults to 6 for i25 and 1 for code39 (per Code 39
               autodiscrimination recommendation); all others default to 0  

           x-density=n, y-density=n
               Adjust the density of the scanner passes. Lower values scan
               more of the image at the cost of decreased performance. Setting
               to 0 disables scanning along that axis. Defaults are both 1.  

       -q, --quiet
           Quiet operation; only output decoded symbol data. specifically this
           disables the statistics line printed (to stderr) before exiting, as
           well as the warning message printed (also to stderr) when no
           barcodes are found in an image  

       -d, --display, -D, --nodisplay
           Enable/disable display of subsequent image files, until next
           --display or --nodisplay is encountered. This option may appear
           multiple times to enable display of specific images. Image display
           is disabled by default  

       --xml, --noxml
           Enable/disable result output using an XML format. This format wraps
           the raw data from the symbol with information about the scan (such
           as page indices) in an easy to parse format. The latest schema is
           available from http://zbar.sourceforge.net/2008/barcode.xsd.  

       --raw
           Enable raw symbol data output. This format prints symbol data
           separated by newlines without the additional symbology type
           information that is printed by default  

EXAMPLES
       Scan a PNG image of a UPC bar code symbol and pass resulting data to a
       script that searches for the code in a database and does something
       useful with it:  

           zbarimg product.png | upcrpc.py  

       The upcrpc.py example script included in the examples/ subdirectory of
       the distribution will make an XMLRPC call to a popular internet UPC
       database and print the product description if found.  

       Scan a JPEG image containing several barcodes and display the image in
       a window, also disabling recognition of Interleaved 2 of 5 codes to
       prevent confusion with other symbologies or background noise:  

           zbarimg --display -Si25.disable label.jpg  

       Look in a scanned document only for Code 39, using XML output format so
       the page numbers are available. To enable only Code 39, first all
       symbologies are disabled, then Code 39 is re-enabled:  

           zbarimg --xml -Sdisable -Scode39.enable scan.tiff  

SEE ALSO
       zbarcam(1)  

       http://zbar.sf.net/  

BUGS
       See http://sf.net/tracker/?group_id=189236&atid=928515  

AUTHOR
       Jeff Brown <spadix@users.sourceforge.net>
           Lead developer  

COPYRIGHT
       Copyright © 2007-2009 Jeff Brown  

       All Rights Reserved  

zbar-0.10                         2009-10-23                        ZBARIMG(1)