The Research On The Image Blind Watermarking Algorithm Based On QR Code

With the popularity of wireless communication technology, the digital watermarking technology which can be used for information hiding and image authentication has been more widely applied. Meanwhile, in the mobile Internet era, QR code has become a hub to connect all. Based on practical application scenarios of Taobao, this paper designs two watermarking algorithms based on QR code and has effectively solved practical problems such as the sharing and reflowing of pictures and image copyright protection.We designed and implemented two watermarking algorithms. The first one is the fast image watermarking algorithm based on DCT quantization. The algorithm is mainly used in the sharing and reflowing of pictures of mobile Taobao application, the main purpose of this algorithm is to hide data and the main performance indicator is speed. Since the algorithm uses optimized BinDCT algorithm and less data embedded based on QR code features, speed has been greatly improved. The algorithm uses quantized DCT coefficients to embed watermark which has enhanced the transparency of watermark. The test results show that the speed of this algorithm is two times faster than other methods on the same platform. This paper proposes another robust blind watermarking algorithm based on DWT and DCT. This algorithm is mainly used for image authentication, in that high watermark transparency and high robustness is the main point. This algorithm uses store ID to generate QR code as the watermark, after the wavelet decomposition we get the low-frequency channel to do DCT transformation. The test results show that the algorithm has high watermark invisibility and robustness.The algorithms described above achieve significantly improvements in watermark invisibility, robustness and speed respect to other methods. They can better meet the practical needs.