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Semi-fragile Image Watermarking Algorithm Based on Region-Segmentation

Author(s): Shengbing Che | Bin Ma | Jinkai Luo | Shaojun Yu

Journal: International Journal of Image, Graphics and Signal Processing
ISSN 2074-9074

Volume: 1;
Issue: 1;
Start page: 59;
Date: 2009;
Original page

Keywords: semi-fragile watermarking | human visual features model | region-segmentation | quantized central limit theorem | coefficient redressal | restore probability

In order to improve the invisibility and the robustness of semi-fragile watermarking, the paper first brings up the idea which embedding watermark based on the attacks’ characteristic, brings forward the region segmentation operator and the image-segmentation embedding method, puts forward the characteristic and its representation in DWT transform domain based on visual features model, and brings forward the quantized central limit theorem which applies to adjusting the coefficients in general transform domain. These all make semi-fragile watermarking embedded through dynamic quantization achieve the greatest robustness. It gives wavelet transform domain coefficient redressal operator and the best restoration probability of the pixel value adjusting in experiments when the images were under attack. It leads up to a better invisibility of carrier image, a better robustness to the image processing, such as JPEG compression, noise adding, filtering, and the larger amount of embedded information. What’s more, it can ascertain the position of vicious attack exactly.
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