A Comparative Research of Robustness for Image Watermarking

Digital watermarking has been proposed as a solution to the problem of copyright protection of multimedia documents in networked environments. This paper implement tow algorithm schemes. First is the LSB (Least significant bit). In this scheme we can replace the least digit of digital image with watermarked information. Second, a discrete wavelet transform (DWT) based digital image watermarking blind scheme has been realized applying the spread spectrum technology, which is not embedded watermarking sequence itself directly, but the random sequence according to a KEY. Through calculation of the correlation, the embedded watermarking was successfully extracted blindly without original vector images. The advantage, the disadvantage and the application occasion of these two schemes were compared. Last, the diversity of robustness against some styles of attack between them were presented by the means of the experiment result.