Valid PDF-417 barcodes to search:
The ReadAllP417BarcodesOnImage method searches for PDF-417 barcodes on the specified part of the image.
Valid PDF-417 barcodes have to meet the following criteria :
· There can be nothing in the smallest horizontal outlining rectangle of the PDF-417 Barcode, but the PDF-417 Barcode itself.
· There must be at least 1 pixel wide quiet zone around the horizontal smallest outlining rectangle of the PDF-417 Barcode.