| 摘要 |
An information image includes a first, second, third, fourth and fifth pixel series which represent first, second, third, fourth and fifth information, respectively. The first and second information are successions of binary numbers 0 or 1. The first and third pixel series are series of pixel lumps arranged continuously as rows in a rectangle. The second and fourth pixel series are series of pixel lumps arranged continuously as columns in the rectangle. The row of the third pixel series is at a predetermined position with respect to that of the first pixel series. The column of the fourth pixel series is at a predetermined position with respect to that of the second pixel series. The fifth pixel series is a series of pixel lumps arranged in an area other than the rows and the columns of the first, second, third and fourth pixel series are arranged.
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