Under the hood, BPattern builds a pattern AST using the same pattern node classes as the rewrite engine. All the original matching and rewriting machinery is still there — just wrapped in a more approachable, scriptable interface.
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:
。业内人士推荐夫子作为进阶阅读
（四）非法拦截或者强登、扒乘机动车、船舶、航空器以及其他交通工具，影响交通工具正常行驶的；
座席也宽敞大气，大理石的圆桌套着一个圆形转盘，中间放了一盆年花，手机镜头放大两倍才能聚焦一道菜。我试着拍了张全景照片，其实画面和往年中秋的家族聚餐看不出太多区别。
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