| 摘要 |
PROBLEM TO BE SOLVED: To provide an information exchange method using a two-dimensional code, which can eliminate the problem that the orderer may erroneously record complete delivery of a product in spite of the fact that the product has been partially delivered.SOLUTION: A first two-dimensional code 10A on an original sheet 1 generates information by a same color as the color of light to be emitted from a two-dimensional code reader, and a complementary color having same brightness as that of the same color. A second two-dimensional code 20A on the original sheet generates information by the same color as the color of light to be emitted from the two-dimensional code reader, and the same color having different brightness from that of the same color. The information on the first two-dimensional code is detectable by the two-dimensional code reader, whereas the information on the second two-dimensional code is undetectable by the two-dimensional code reader. The information on the first two-dimensional code on a monochrome copy sheet is undetectable by the two-dimensional code reader, whereas the information on the second two-dimensional code on a monochrome copy sheet is detectable by the two-dimensional code reader. Information exchange is thus performed by using the original sheet and the monochrome copy sheet. |
