A New Approach Copyright Protection of Images Based on the Trace Transform
一种基于Trace变换的数字图像版权保护算法

Watermarking scheme is a well-known method for copyright protection of images. However, we can not identify who the real owner is if multiple watermarkings are embedded in an image or the embedding algorithm of watermarking has made public because some attacks can destroy the watermarking. In this paper, a robust copyright protection scheme for digital images that combines trace transform and timestamp technique is proposed. Firstly, the features of the image are extracted using the trace transform. Then the message is registered at the fair third party in order to gain the timestamp. Finally, we can use the timestamp to prove who the real owner is. Experimental results are given and compared with the results of the method based on the geometric moment invariants. The results show that the scheme can well withstand geometrical attacks such as rotation, scaling, shearing, combined attack, affine transform, remove lines, filter and JPEG lossy compression.