中文摘要：

文章对差分能量水印方法进行了改进。为了阻止经JPEG压缩后加水印图像在嵌入水印时建立的局部能量差可能会被擦除，在保证视觉质量不受影响的情况下，适当地增加子区A或B的能量，从而使得当。比较小时．能降低加水印图像经过JPEG压缩后的水印检测比特差错率。实验结果表明：在n较小时，这种改进是很有效的。

英文摘要：

We modify the differential energy watermarking. After JPEG compression on the image embedded watermark, the energy difference which have been created while watermark was embedded could be erased. In order to prevent this disappearance, under the condition of ensuring good quality of the image, the energy of A or B subregion is properly increased to ensure that the bit errors can drop a lot alter the JPEG compression of the image embedded watermark as n is comparatively small. The experimental result proves that the modified method is robust as n is comparatively small.