针对图视密码学方案存在的恢复图像的对比度和清晰度降低，且像素扩展太大，生成分存图像太大的缺点。

Visual cryptography scheme has its shortcomings: the contrast and resolution are decreased, and the pixel expansion makes the size of the share transparencies very big.

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图3.2：为1991至1995年英格兰和威尔士以及2003年至2007年英国卵巢癌年龄相关组5年生存率。

Figure 3.2: Ovarian Cancer, Five-Year Age-Specific Relative Survival Rates, England and Wales, 1991-1995, and England, 2003-2007.

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存一大罐硬币并埋在你家后面的院子里。然后画一张藏宝图，交给你的一个朋友。(让他找去吧！)

Amass a jar of COINS. Bury them in your back yard. Draw a treasure map and give it to a friend.

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