Color Image Watermarking Algorithm For QR Code

With the rapid popularization of computers and the continuous development of the Internet,social media such as We Chat and Weibo have begun to use,allowing more and more digital products to spread,but there have also been acts of tampering,illegal transmission and copyright theft.These actions have seriously affected the interests of copyright owners,but at the same time also accelerated the generation and development of digital watermarking technology,making watermarking technology widely used in various fields in China.The research on color image watermarking technology has strong practical value,because color images have vivid advantages and the ability to express information intuitively.The main work of this article is as follows:(1)A DWT-DCT-SVD watermarking algorithm is proposed.The algorithm first converts the color image from RGB space to HSI space,performs a first-level DWT on its I channel,and performs DCT transform and SVD decomposition on the four subbands obtained to obtain four diagonal matrices;subsequently,simulations will be implemented.The QR codes after Affine transformation and Arnold transformation are respectively embedded in the matrix,and the watermark with the largest NC value is selected as the final extracted watermark when extracting the watermark.It can be known from the implementation results that the PSNR and NC values of the watermarking algorithm on the transparency test are 59.4919 and 1,respectively;In the robustness test,the PSNR and NC values of the color image embedded with QR code after attack are higher than 32 and 0.98.(2)A DWT-Slant-SVD double watermark algorithm is proposed.The algorithm first converts the color image from RGB space to YCb Cr space,performs three-level DWT on the Y component of the space to obtain low-frequency HL sub-graphs,performs Slant transformation and SVD decomposition on the sub-graphs,and then implements logistic mapping and The affine-transformed QR code is embedded in it.The color image embedded with QR code is converted from RGB space to YUV space,and the second-level DWT of the Y component of the space will obtain the low-frequency sub-picture,and the picture will be divided into SVDs to divide the largest singular value in each block.It is extracted to form a one-dimensional sequence Sa,and a zero watermark is generated.Finally,the block size is packed with the largest singular value in each small block and sent to the IPR center for registration.The experimental results show that on the transparency test,the PSNR and NC values are 51.2714 and 1,respectively;on the robustness test,the PSNR and NC values of the color image embedded with the QR code after the attack are above 32 and 0.98.