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willglynn avatar willglynn commented on July 17, 2024

Following these same steps, I get:

> r = z.process
 => [#<ZBar::Symbol:0x007fd63a869c60 @symbology="EAN-13", @data="9788679912077", @addon="", @quality=835, @location=[[819, 28], [463, 29], [130, 29], ...]>]

Are you sure the zbar gem is loading the right libzbar.so? Try setting the ZBAR_LIB environment variable to its full path.

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pzb avatar pzb commented on July 17, 2024

I'm sure it is loading the right libzbar:

irb(main):007:0> ZBar.ffi_libraries.map{|x|x.instance_variable_get(:@name)}
=> ["/usr/lib64/libzbar.so.0.2.0", "/usr/lib64/libzbar.so.0"]

[user@ip-10-0-0-119 ~]$ ldd `which zbarimg` | grep zbar
        libzbar.so.0 => /usr/lib64/libzbar.so.0 (0x00007f625b520000)

If I run convert bigstock-Barcode-18830351.jpg bigstock-Barcode-18830351.pgm and then use ZBar::Image.from_pgm, it processes the pgm image and decodes the barcode fine. So there is only a problem with jpegs.

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ArthurN avatar ArthurN commented on July 17, 2024

Almost a year later, I have this same problem. In my case, I'm on CentOS, and rebuilt the rpm from source, applying the patch provided here.

However, running the image directly through the zbarimg binary DOES work.

@pzb Did you ever resolve this, or just end up converting to PGM?

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arloan avatar arloan commented on July 17, 2024

It's may be a JPEG quality issue.

I got a .png QR Code image cropped from a scanner generated image, and zbarimg can read it. While when I use imagemagick convert it to .jpg, then zbar failed to read it. Convert it to .pgm, zbar reads it.

Finally, I convert it to .jpg via command: convert crop.png -quality 90 crop.jpg, then zbar can read the jpg file now.

bogon: ~/Downloads/VouchPic ]
stone$ zbarimg crop2.png
QR-Code:01,01,3400182130,00993210,1635.85,20180814,,4A08,
scanned 1 barcode symbols from 1 images in 0.01 seconds

bogon: ~/Downloads/VouchPic ]
stone$ convert crop2.png crop2.jpg
bogon: ~/Downloads/VouchPic ]
stone$ ruby -r zbar -e "p ZBar::Image.from_jpeg(File.binread('crop2.jpg')).process"
[]
bogon: ~/Downloads/VouchPic ]
stone$ convert crop2.png -quality 90 crop2.jpg
bogon: ~/Downloads/VouchPic ]
stone$ ruby -r zbar -e "p ZBar::Image.from_jpeg(File.binread('crop2.jpg')).process"
[#<ZBar::Symbol:0x00007ff6ce11cb10 @symbology="QR-Code", @data="01,01,3400182130,00993210,1635.85,20180814,,4A08,", @addon="", @quality=1, @location=[[20, 11], [17, 200], [211, 203], [212, 13]]>]
bogon: ~/Downloads/VouchPic ]
stone$

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