Color qr code digital watermarking method with low false alarm rate
A technology of digital watermarking and QR code, applied in the field of digital watermarking of color QR codes with low false alarm rate, can solve the problems of large amount of information embedded in double color images, high false alarm rate of SVD algorithm, low invisibility, etc. performance, improve efficiency, and solve the problem of high false alarm rate
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[0030] 1. Wavelet transform
[0031] Such as figure 1 The DWT transform subband distribution diagram shown, the color image can be decomposed into four subbands after one-level DWT transformation, namely LL (low frequency subband), HL (horizontal intermediate frequency subband), LH (vertical intermediate frequency subband), HH (high-frequency sub-band), multi-level decomposition and so on. The low-frequency sub-band is distributed in the upper left corner, which contains most of the outline and brightness information of the image. The watermark embedding here has better resistance to attack, but the invisibility will Affected; the middle frequency is distributed in the lower left and upper right corners, and the watermark embedding here has better anti-attack and invisible; the high-frequency sub-band is distributed in the lower right corner, and the watermark embedding is invisible here, but anti-attack poor.
[0032] 2. A low false alarm rate color QR code digital watermar...
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