Digital Watermarking Algorithm for Color Image Using SIFT Image Correction.
Hao Huang · Journal of Chinese Computer Systems · 2009
This paper presents a new robust watermarking extract scheme for color image using scale invariant features transform(SIFT) image correction.A binary watermark image is permuted with sequence numbers generated by a secret key in a spatiotemporal chaos system.Then,the binary image watermark was encoded by Gray code,and then adaptively embedded into low frequency components of discrete cosine transform domain in the original color image′s blue channel.In watermarking extract scheme,the scale invariant features of images are extracted,and the match points between the watermarking image and the reference image are found.Then the watermarking image is corrected by affine transform of these match points.At last,the watermark is extracted from the corrected image.Experimental results show that the proposed scheme is robust and secure against a wide range of image processing operations such as adding noise,filtering and lossy compression.