Adaptive Digital Watermarking Algorithm Based on Matrix Norm Analysis
Weihua Wu · Video Engineering · 2012
An adaptive digital watermarking algorithm based on matrix norm analysis is proposed about copyright protection of the digital products.In the algorithm,unrepeatable block with size of 8×8 is performed on the given image,and then discrete cosine transform(DCT) is made.According to the 8×8 templates,a new matrix is respectively formed by each block of low,high-frequency data and singular value decomposition(SVD).Human visual characteristics and matrix norm theory analysis are combined with to solve the corresponding block energy in order to determine the embedding position.The watermark information is embedded in the first value of singular value decomposition about the low-frequency area of matrix,and embedding strength is automatically adjustable with block energy.Theoretical analysis and experimental results show that the new watermarking scheme has a good transparence of embedded watermark image and is robust against attacks such as Gaussian noise,filtering,JPEG compression and geometric distortion.