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A shift-resisting public watermark system for protecting image processing software

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3 Author(s)
Ding-Yun Chen ; Dept. of Comput. Sci. & Inf. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Ming Ouhyoung ; Ja-Ling Wu,

Digital watermarking is a technique used to protect the ownership of images and their associated software. A useful watermark scheme should be visually imperceptible and must be robust to resist various attacks: such as JPEG compression, pixel-shifting, cropping, blurring, etc. In this paper, we propose a public watermarking system to protect image processing software and images. We embed a binary image as a watermark in the DCT domain and the watermarked image is imperceptible by the human visual system and robust to image shifting or cropping. We use a feature-based approach to synchronize the watermark positions during embedding and extracting. For better image quality, the more complex in a block, the more bits can be embedded. Our approach doesn't need the original image for watermark extraction, which is a useful feature in protecting software applications such as real-time generated panorama images

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Consumer Electronics, IEEE Transactions on  (Volume:46 ,  Issue: 3 )