这样一来，窥视者在其他角度看过去，由于眼睛接收不到来自屏幕的光线，看上去仿佛屏幕根本没有点亮，从而实现宏观的防窥的效果。
Honey is a common target for food fraudsters
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Екатерина Щербакова (ночной линейный редактор)
Instead of taking the nearest candidates to , we can look for a set of candidates whose centroid is close to . The N-convex algorithm works by finding the closest colour to a given target colour for iterations, where the target is first initialised to be equal to the input pixel. Every iteration the closest colour added to the candidate list, and the quantisation error between it and the original input pixel is added to the target.