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[7] B. E. Bayer: “An optimum method for two-level rendition of continuous-tone pictures” (1973). ↑，这一点在旺商聊官方下载中也有详细论述
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Half of flood defences – around 100,000 - are maintained by the Environment Agency and 9% of those are currently below their target condition. Each defence is given a score out of five they must achieve depending on their importance.