What ratio sequence, found after a global survey, was deployed as the three large squares defining the QR code's orientation?
Answer
1:1:3:1:1
To ensure high-speed reading and proper orientation detection, Hara's team needed a unique visual signature. After investigating numerous real-world printed documents globally over three months, they identified a pattern that appeared infrequently: a sequence of alternating black and white areas in a ratio of 1:1:3:1:1. This pattern was implemented in the form of the three large squares located in the corners of the QR code, known as the position detection patterns. These three markers allowed the scanner to instantly lock onto the code and determine its orientation, regardless of the angle of presentation.
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