Blind Extraction of Digital Watermarking Algorithm for Color Images

Digital watermark technology hides copyright information in digital images, effectively protecting the of images. At present, color image watermarking algorithm still has defects such as inability to balance robustness, invisibility and weak anti-attack ability. Aiming at above problems, this paper studies method based on discrete wavelet transform cosine transform. Then proposes a blind QR code. First, convert from RGB space YCbCr space, extract Y component perform second-level secondly, block LL2 subband finally, use embedding after Arnold embedded block. The experimental results show that PSNR with code is 56.7159 without being attacked. After attacked, its NC values are respectively 30dB 0.95 or more, which proves good robustness can achieve extraction.