Can't recognize PDF417

Discussions about PDF417 barcode reading and writing.
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Enrique
Posts: 1
Joined: Tue Aug 26, 2014 3:11 am

Can't recognize PDF417

Post by Enrique » Tue Aug 26, 2014 4:08 am

Attached to this post there are 2 JPGs, from which I can't read the PDF417 barcode.
One is a Color 300dpi image, and the other is a Grayscale 300 dpi
Many, many things I tried, but cant't recognize the barcode.
I'm just using the provided demo inside the folder: "...\GdPicture.NET 10\Samples\AnyCPU\vb.net\Barcode Recognition"
Color_300dpi.jpg
Gray_300dpi.jpg
Please tell me some hints...

SamiKharma
Posts: 352
Joined: Tue Sep 27, 2011 11:47 am

Re: Can't recognize PDF417

Post by SamiKharma » Wed Aug 27, 2014 7:38 am

Hi,

The reason is simple: The image was scanned with really low sampling: it has a dpi of 72.
For proper detection, images need to be sampled at 200-300 dpi to provide no overlap or mis-shaped barcodes.

Best,
Sami

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