| 摘要 |
A machine readable symbol (10) includes a rectilinear data field (12) having a plurality of data cells (14) arranged into a matrix. Each data cell (14) is assigned a data pattern (20) value or a finder pattern (22) value. Preferably, at least some of the data cells (14) or even all of the data cells, include at least one data pattern (20) value and a finder pattern (22) value which are overlapping. A color corresponding to the data pattern (20) value, finder pattern (22) value, or overlapping data pattern value and finder pattern value is assigned to each data cell (14). A finder pattern (22) is discernable when the symbol (10) is placed under a first color filter or exposed to a first color. A data pattern (20) is discernable when the symbol (10) is placed under a second color filter, or exposed to a second color.
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