Improved SVD-Based Digital Watermarking Algorithm
Fanglin Niu · Journal of Liaoning University of Technology · 2010
An improved SVD-based digital watermarking algorithm was proposed,which made the original image divide into blocks and brought the former M sub-blocks into singular value decomposition.Then each sub-block's biggest singular value was selected.After BCH error correcting codes and interleaved pretreatment the M watermark information was embedded into these biggest singular values by quantization method.Because the watermark information embedded was done with quantization methods,the received image authentication needed no information about the original image.This algorithm realized blind extraction of digital watermarking.Meanwhile,the extraction process was effected and limited by the interleaving parameter,so the digital watermarking could not be extracted without this parameter.The watermark was encrypted.The experimental results showed that the improved algorithm achieved better robustness and safety than that of the original one.