Timing Pattern

Timing patterns consist of two lines: a horizontal line connecting the top-left and top-right finder patterns, and a vertical line connecting the top-left and bottom-left. Modules alternate one by one between black and white, serving as a "ruler" for scanners to accurately count module coordinates.

Even when module spacing becomes uneven due to print distortion or camera angle, the alternating timing pattern serves as a reference for calculating each module's position. Timing patterns work together with finder and alignment patterns.