解密时只需将全部或若干个分存图片叠加，依靠人眼就可以直接识别出密图，不需要大量复杂的密码学运算。
Stacking all or part of these transparencies will allow visual recovery of the secret image with no special cryptographic computation, unlike almost any other cryptographic techniques.
高尔顿发明了一种将不同脸的部位相互叠加而创作合成图片的方法。
Galton devised a method of creating composite pictures in which the features of different faces were superimposed over one another.
上面的插图是一幅概念图片，显示了戴上这种眼镜会看到的情景：画面上叠加了一个字母E。
The illustration above is a concept image showing what it would look like with the lens displaying a digital overlay of the letter E.
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