认证时通过水印差值定位图像被篡改的位置，通过奇异值差值反映被篡改区域的篡改强度。
The tampered area of the watermarked image could be reflected in the watermarking difference map and the tampered intensity could be reflected in singular values difference.
实验结果表明。该算法不仅能够精确定位图像中旋转篡改的区域，而且能估算出区域旋转角度。
Experimental results demonstrate that the proposed approach can not only localize the duplicated regions accurately, but also evaluate the rotation Angle effectively.
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