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交流一些 #反数字密写 的一些方法

what happened:

1.现在很多公司的网页,很多app #截屏 模块都有密写的水印。

目的是什么,就是溯源。

你发了一个截屏,然后吐槽,发在微博。

你以为别人不知道你是谁。

但是,公司或者有关机构一下子就可以根据你的图片溯源出你是谁。

然后线下的麻烦来了。

图1,就是一个例子。

这个很简单。

还有各种各样的密写方式,比如有的公司会按照一定的规律放像素。然后解码就出来了。

这种直接在图像上可以看得到的都是时域加的水印。

如果了解 #数字水印 的话,如果在往频域里面加密写的信息。你缩放,旋转,截图,都很难干扰数字水印。你搜一下小波与数字水印,这是好多年前非常流行的一个研究领域。

对抗数字水印

对于时域的密写有一些工具,帮你看看有没有密写区域。比如用网站FotoForensics 帮你找出来,你仔细看对比区域,就可以看到密写区域。红圈处。

无论是频域还是时域的水印,一个办法就是用另外一个手机拍摄屏幕(不要拍视频)

用手机拍摄图片是一种非常有效的干扰方式。特别你加上一定的角度与光照曝光的情况下。无论是那种水印密写都会受到巨大干扰。但是手机拍摄的图片如果处理不好,会包含更多的信息,所以你需要把你的手机图片的exif信息全部抹掉。网页链接

这样是最大可能去除各种密写水印的办法。

source



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交流一些 #反数字密写 的一些方法

what happened:

1.现在很多公司的网页,很多app #截屏 模块都有密写的水印。

目的是什么,就是溯源。

你发了一个截屏,然后吐槽,发在微博。

你以为别人不知道你是谁。

但是,公司或者有关机构一下子就可以根据你的图片溯源出你是谁。

然后线下的麻烦来了。

图1,就是一个例子。

这个很简单。

还有各种各样的密写方式,比如有的公司会按照一定的规律放像素。然后解码就出来了。

这种直接在图像上可以看得到的都是时域加的水印。

如果了解 #数字水印 的话,如果在往频域里面加密写的信息。你缩放,旋转,截图,都很难干扰数字水印。你搜一下小波与数字水印,这是好多年前非常流行的一个研究领域。

对抗数字水印

对于时域的密写有一些工具,帮你看看有没有密写区域。比如用网站FotoForensics 帮你找出来,你仔细看对比区域,就可以看到密写区域。红圈处。

无论是频域还是时域的水印,一个办法就是用另外一个手机拍摄屏幕(不要拍视频)

用手机拍摄图片是一种非常有效的干扰方式。特别你加上一定的角度与光照曝光的情况下。无论是那种水印密写都会受到巨大干扰。但是手机拍摄的图片如果处理不好,会包含更多的信息,所以你需要把你的手机图片的exif信息全部抹掉。网页链接

这样是最大可能去除各种密写水印的办法。

source

BY 浮光掠影








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