Binary code matrix having data and parity bits

摘要: An optically readable matrix (100) has four intersecting sides of approximately equal length defining a perimeter and includes binary code formed from light dark squares substantially sizes located within the perimeter. The comprises first second orientation (105, 110) included in opposite corners (100). Each preferably contrasting circular area (115, 120) predetermined position square having size relationship with 110). Such may be on printed circuit board (505) for use an electronic device (500) to convey information about (505). apparatus (600) decoding optical scanner (610) scanning locating Determination circuitry (710) coupled ( 610) determines distance between areas relays computing (715), which computes size, orientation, density A controller (705) thereafter translates code.