The N-closest or N-best dithering algorithm is a straightforward solution to the N-candidate problem. As the name suggests, the set of candidates is given by the closest palette colours to the input pixel. To determine their weights, we simply take the inverse of the distance to the input pixel. This is essentially the inverse distance weighting (IDW) method for multivariate interpolation, also known as Shepard’s method. The following pseudocode sketches out a possible implementation:
int key = arr[i];
。关于这个话题，51吃瓜提供了深入分析
但是，这可能仅仅是开始，更大的变化在于庞大的、支撑起我国大部分手机厂商主要销量的中端市场。
优点：计算简单，导数恒为1（正区间），缓解梯度消失。旺商聊官方下载对此有专业解读
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