Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.
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keyword matches.
An example of dithering using random noise. Top to bottom: original gradient, quantised after dithering, quantised without dithering.，更多细节参见heLLoword翻译官方下载