多类水印
Multiple types of watermarks
以上为机器翻译结果，长、整句建议使用 人工翻译 。
研究了多类数字水印同时嵌入的问题，提出了一种同时嵌入两类水印的图像数字水印算法。
It is studied that the problems in embedding multiple watermarks simultaneously, and proposed an image watermarking scheme which embedded fragile and robust watermarks at the same time.
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