Grouping strategies for promoting image quality of watermarking on the basis of vector quantization
Journal of Visual Communication and Image Representation
Fractal and XML based watermarking for digital images
ICIMCS '10 Proceedings of the Second International Conference on Internet Multimedia Computing and Service
A multi-purpose digital image watermarking using fractal block coding
Journal of Systems and Software
Watermarking using similarities based on fractal codification
Digital Signal Processing
Watermarking in binary document images using fractal codes
Pattern Recognition Letters
| Hi-index | 0.00 |
A novel watermarking method is proposed to hide a binary watermark into image files compressed by fractal block coding. This watermarking method utilizes a special type of orthogonalization fractal coding method where the fractal affine transform is determined by the range block mean and contrast scaling. Such orthogonalization fractal decoding is a mean-invariant iteration. In contrast, the fractal parameters of classical fractal compression are very sensitive to any change of domain block pool and to common signal and geometric distortion. Hence, it is impossible to directly place a watermark in fractal parameters. The proposed watermark embedding procedure inserts a permutated pseudo-random binary sequence into the quantized range block means. The watermark is detected by computing the correlation coefficient between the original and the extracted watermark. Experimental results show that the proposed fractal watermarking scheme is robust against common signal and geometric distortion such as JPEG compression, low-pass filtering, rescaling, and clipping.