【摘要】 本文提出了一种适用于医学图像内容认证和保护的可恢复性水印算法。选取图像的小波重要系数进行SPIHT编码生成水印;使用Arnold变换确定其嵌入块位置并将其加密嵌入到图像数据低位;通过链式认证结构实现水印信号的检测和图像篡改数据的定位,由SPIHT解码完成篡改数据的恢复。实验表明,该算法在保证含水印医学图像具有良好视觉透明性的基础上,还可以定位并恢复被篡改区域内容。更多还原

【Abstract】 In this paper, a restorable watermarking algorithm is proposed for medical image content authentication. Important DWT coefficients are chosen to be coded with the SPIHT algorithm for generating watermarking. The improved security watermark scrambled by Arnold transformation was then embedded into the lower bits of the image data. Finally, the chain structure was used to detect the watermarking and identify the altered positions. The altered data in an image was restored by SPIHT decoding. The experimental results demonstrated that the watermarked image not only possessed good perceptual transparence but also allowed location and restoration of the tampered content.更多还原