| 摘要 |
The present invention relates to a dot code and a reader which is adapted to prevent the codes on the upper and lower lines from overlapping with each other and to be positively read out. A two-dimensional code is realized which can be read out positively. A printing section, when printing a two-dimensional code, prints dots on every other line. Dots are printed on every column. However, on the adjacent columns, dots are printed in a manner deviated in phase. With this, in the case of detecting a dot concentration in each direction of line and determining a presence or absence of a code, the waveform representing a color tone deviates in phase line by line, thus making possible to positively recognize a change in the lines.
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