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.
p = p.next; // 指针后移，易错点2：忘记移动指针会导致死循环
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这是因为当时多家医院在孕产妇的登记入院上存在漏洞。对于前来生产的产妇，医院并不需要她们持本人身份证去办理住院登记。代孕中介会用客户的身份证办理住院手续，产妇则以客户的身份住院。生产后办理证明时，孩子自然成了客户的。而真正生育孩子的孕妈，其真实身份和信息都被隐去。
甚至还有一些讲究「降本增效」的防窥膜，只蚀刻纵向光栅，导致只能左右防窥、上下或者斜视看过去依然是一览无余的：