It is not clear whether these statements are true. * QR codes mandate a minimum of 15% area used for error correction and a maximum of 60%. * Data Matrix code

It is not clear whether these statements are true. * QR codes mandate a minimum of 15% area used for error correction and a maximum of 60%. * Data Matrix codes mandate a minimum of 0% area used for error correction and a maximum of 50%. * The amount of overhead in QR codes (finders, timing, alignment) is probably in the same ballpark as Data Matrix codes (black lines, checkered lines). * PDF417 codes demand low vertical resolution (e.g. 15 thick steps) but high horizontal resolution (e.g. 200 thin steps). They are hard to scan on a phone camera. Although this thick-thin design is appropriate for line scanners, the asymmetry in horizontal-vertical information density leads to poor information density overall and higher susceptibility to damage and unreadable barcodes. Square primitive blocks make sense because they are more spatially balanced.