Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.
中國國家主席習近平近日罕見地公開提及一場導致國家最高將領被撤職的清洗行動。
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4 A good discussion on luminance and how to calculate it can be found on this stack exchange question. ↑