基于最相似邻近区域方向码的自修复水印技术

A SELF-RECOVERY WATERMARK TECHNOLOGY BASED ON SIMILAR NEIGHBOURING-BLOCK DIRECTION CODE

针对图像在传送过程中有可能出现大规模损坏的情况,提出基于最相似邻近区域方向码的自修复水印技术,用来判别复原数据是否遭受破坏,以避免将正确的图像使用错误的复原数据还原,并且可以在复原信息产生错误时,利用方向码所指的相似区域将受损的图像区域修复,起到了辅助筛选复原数据是否发生错误的作用。实验证明,该技术的复原效果显著,提高了PSNR值,使得还原后的图像在空间领域的图像值较遭受攻击后的图像接近原始图像,具有一定的实用价值。

In the paper it proposed a kind of self-recovery watermark technology based on similar neighbouring-block direction code, focusing on the situation that large-scaled damage may occur during the transmission of image. The technology is used to estimate whether or not the recovered data is damaged, thus preventing the right images from being restored by wrong data. If damage really happens and there are mistakes existed in the recovered data, similar area pointed by direction code can be used to repair damaged image area, which assists in sifting out wrong datum from the restored data. As proved by experiments, the recovery effect of the technology is notable, the PSNR value is promoted distinctly and makes the recovered image in term of image value of spatial domain closer to the original image than attacked image. So this method has considerable applied value.