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原图是不是满足什么样的条件才可以识别出暗码？我电脑截屏了一个图片无法识别出暗码 about blind_watermark HOT 5 CLOSED

guofei9987 avatar guofei9987 commented on May 15, 2024
原图是不是满足什么样的条件才可以识别出暗码？我电脑截屏了一个图片无法识别出暗码

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Comments (5)

warm-ice0x00 avatar warm-ice0x00 commented on May 15, 2024 1

截图用 PIL resize 到原图尺寸就可以识别了。

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guofei9987 avatar guofei9987 commented on May 15, 2024

大多数能识别的。

如果图片大部分在低频区域，算法需要调参。相关方法我已经写好了（虽然还比较粗糙，有空再优化）bwm.extract_raw

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Daniel-He-KX avatar Daniel-He-KX commented on May 15, 2024

截图的方式也解决了？

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Vickko avatar Vickko commented on May 15, 2024

截屏攻击确实无法识别。

我在m1 MacBook，macos11.3上尝试了readme内的样例图片，具体方式为使用原图和水印生成embedded.png后，使用系统自带的预览app打开，放大至全屏并截屏。生成新的screenshot图片后尝试extract，生成噪声图片，无法识别。
exscreenshot

ori_img
watermark
embedded
screenshot

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guofei9987 avatar guofei9987 commented on May 15, 2024

最近更新了一个版本，对截屏攻击的抵抗力大大增强，见于这里：

blind_watermark/examples/example_str.py

Line 40 in 4c52b9a

# %% 截屏攻击 = 剪切攻击 + 缩放攻击 + 不知道攻击参数

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