If you are looking for free open source PDF / Open Source, your options are probably limited. Understand that barcode scanning is a problem of image processing (blur, skew, tilt, reflection, etc.), which a number of companies are engaged in and create a business. And if they were around back when PDF417 started, they probably had different IP bits (patents) protecting their investment. If the open source versions are not responsive enough for you, you will have to think about buying any commercial code that will meet the requirements that you have. Good luck.
Morrison chang
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