image - Improving quality of aztec barcode before reading using zxing

Question

I'm trying to decode aztec codes from images using zxing library.

Images looks more or less like this:

https://imgur.com/a/5ExPy6q

So far my results are quite random.

I've tried a few image processing actions using imagemagick such as:

convert -brightness-contrast 50x20 in.png out.png

convert -colorspace Gray in.png out.png

And there was improvement but still most of codes fails to decode.

What specific image preprocessing actions should I do for such barcodes ?

标签： imageimage-processingimagemagickzxingaztec-barcode

Answer 1

您可以在 Imagemagick 中尝试 -lat（局部区域阈值）。例如：

输入：

convert barcode.png -colorspace gray -negate -lat 20x20+10% -negate result.png

您可以通过添加 -morphology close 来稍微改进一下：

convert barcode.png -colorspace gray -negate -lat 20x20+10% -negate -morphology open diamond:1 result2.png