The invention relates to a two-dimensional code superposition
digital watermarking method, an identification method and an
identification system thereof. The two-dimensional code superposition
digital watermarking method comprises the following steps of firstly, acquiring anti-fake information and LOGO image information of a commodity; then adding
verification information into the anti-fake information and then carrying out
encryption processing; and then generating a two-dimensional code through encrypted anti-fake information; and finally, adding
digital watermarking information in the LOGO image information, then taking as a new layer and superposing to the two-dimensional code so as to form a new image, and then taking as a sign and printing on the commodity. The printed commodity can acquire
decomposition which is basically consistent with the
decomposition of an original image on a visual sense aspect under a standard visible
light source. Anti-fake information copy difficulty and an anti-fake coefficient are high so that non-authoritative copy can be prevented. Based on a condition that a commodity printing flow is not changed, commodity printing cost is reduced. Simultaneously, the
verification information and the anti-fake information of
encryption processing are added so that extraction robustness is increased.
Digital watermarking is added in a LOGO image so that safety is high and an anti-fake capability is high too.