Double Digital Watermarking Method based on Transform Domain has realized the double aims of the copyright protection and the integrity authentication of image content.

基于变换域的双重数字水印方法，通过嵌入鲁棒水印和脆弱水印实现了图像内容版权保护和完整性认证的双重目的。

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One way of doing this is to use image-authentication systems to reveal if someone has tampered with a picture.

一种做法是运用图像鉴定系统来显示是否有人擅自改动了图片。

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Pointing out the limitation of the image authentication algorithm based on dividing blocks and give the reason why collage attack can be successful.

指出基于分块的图像认证方法存在的缺陷，以及共谋攻击得以成功的原因；

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The data-hiding technique neatly fits within the image, and all the authentication tasks are localised, notes Guarav Sharma of Xerox.

ECONOMIST: MONITOR