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    초록·키워드

    Digital images are frequently attacked by partially cropping interesting parts of the images such as human face. Protecting the copyright against such attacks using watermarking methods becomes important as the numbers of the attacks increase. However, the extracted watermark usually falls in small pieces. As a result, it is hard to reconstruct the original watermark. This paper proposes a new way for reconstructing the extracted watermark from the cropped parts of watermarked image. In this method, the original watermark is firstly divided into small sub-block images. Each sub-block is matched with all pieces of extracted watermark image by normalized cross-correlation. The watermarked images that exactly match with a block of the original watermarks are labeled as the parts of the watermark. Finally, the overall similarity between the original watermark and the matched ones is computed in order to determine the owner of the image. In the experiments, this method has a high similarity of the reconstructed watermark image compared to the original, for any sizes, shapes and locations of cropping.

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      UCI(KEPA) : I410-ECN-0101-2013-569-001124275