As the best reading performance could be obtained when QR code’s
modules are scanned with no distortion and blurring, determining
a proper size of results that are either shown on a display device
or printed on a paper becomes an importance issue. We recommend
readers to enlarge the image in the digital display to obtain a
clear vision of submodules before scanning the image. To determine
the actual image size in the printout, there is a guideline [DENSO
WAVE 2003] for measuring the actual size of module according
to printer specifications. We took a conservative specification of a
laser printer with 360dpi resolution and obtained a recommended
submodule size of 0.35mm, indicating a recommended module size
of 1.05mm. Results shown in the paper are carefully scaled to fit
the estimated size as close as possible.