If there are two or more barcode on the A4 papers , and their position are random.
Maybe on the left and right or only on left have barcodes.
Which barcode will be recognized when i setROI is A4 size and use _oGdPictureImaging.Barcode1DReaderDoScan(ImageID) method.
I am not 100% sure i understand you perfectly, here is what I got, and if I am incorrect please do correct me:
You want the barcode reader to recognize all the barcodes in a page that is a size A4 if you set the ROI to be the whole page size, meaning A4.
If that is the case it will recognize all the barcodes in the image.
Please do have a look at our Barcde Recognition demo for a better understanding.
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