Spread spectrum watermaking algorithm based on utilizing human visual masking and SVD
Juan Bai · Jisuanji yingyong yanjiu · 2011
Most digital watermarking algorithms are not roburst against geometric attack.This paper presented an algorithm based on code division multiple access(CDMA) and singular value decomposition(SVD).The algorithm also incorporated the human visual system model to balance the watermark robust and transparent performance of the two major indicators,the secret information embedded into the low frequency region of the image after wavelet decomposition.The watermarking could be extracted in three stages.First,decomposed the test image using discret wavelet transform.Secondly,the singular value decomposition and part after the low-frequency was made.Finally,extracted the binary information to do cross-correlation with the Gold sequence that obtained from the key.Lastly,got the final desired watermark sequence.Theoretical analysis and experimental results show that the algorithm can resist a variety of geometric attacks,also has good noise robustness.The method's performance is much better than the existing and similar watermark algorithms.