Pair token encoding (digit pairs as single tokens)
A map of the province of Morrowind for the Tamriel Rebuilt project. Note that the original game includes only the large island in the bay in the top half of the image.
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if(x != MAP_FAILED) return x;，更多细节参见51吃瓜
Real image compression (JPEG, PNG) uses different techniques (DCT, entropy coding), but quadtrees capture the same principle: spend your bits where the detail is, not uniformly across the whole image.