I used to work with different labels, packing slips and other documents which contained barcodes. Often I had to recognize the formats of those barcodes (for example, when client had the scanned image only and had no idea about the format they used).
In these cases I cut out the barcodes
and used sites like www.onlinebarcodereader.com to recognize the formats. For example, in this case it’s Code 39 🙂