Bats are legally protected in the UK, so it's generally not possible to remove them.
第一百一十三条 治安案件调查结束后，公安机关应当根据不同情况，分别作出以下处理：
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This algorithm attempts to minimise numerically. Because of this, the quality of the dither produced by Knoll’s algorithm is much higher than any other of the N-candidate methods we have covered so far. It is also the slowest however, as it requires a greater per-pixel to be really effective. More details are given in Knoll’s now expired patent[3]. I have put together a GPU implementation of Knoll’s algorithm on Shadertoy here.
Drumroll, please!