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 1553520702.jpg:0.63 0.61 0.59 0.62 0.6   
zbarimg -Sdisable -Scode128.enable 1553520702.jpg:0.56 0.61 0.55 0.56 0.55   
zbarimg -Sno-position 1553520702.jpg:0.59 0.6 0.62 0.6 0.62   
zbarimg -Sy-density=10 1553520702.jpg:0.42 0.43 0.41 0.42 0.42   
zbarimg -Sy-density=20 1553520702.jpg:0.42 0.4 0.41 0.41 0.4   
zbarimg -Sy-density=40 1553520702.jpg:0.4 0.4 0.42 0.4 0.39   
zbarimg -Sy-density=10 -Sx-density=10 1553520702.jpg:0.2 0.2 0.21 0.23 0.21   
zbarimg -Sy-density=10 -Sx-density=20 1553520702.jpg:0.2 0.2 0.19 0.19 0.21   
zbarimg -Sy-density=10 -Sx-density=40 1553520702.jpg:0.19 0.2 0.21 0.2 0.19   
zbarimg -Sy-density=10 -Sx-density=0 1553520702.jpg:0.18 0.18 0.18 0.18 0.18   
zbarimg -Sy-density=20 -Sx-density=0 1553520702.jpg:0.17 0.17 0.17 0.18 0.16   
zbarimg -Sy-density=40 -Sx-density=0 1553520702.jpg:0.16 0.16 0.17 0.16 0.16   
zbarimg -Sy-density=40 -Sx-density=0 -Sdisable -Scode128.enable -Sno-position 1553520702.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)