A low threshold preserves detail (more leaf nodes, less compression). A high threshold merges aggressively (fewer leaves, more compression, but the image gets blocky). The grid overlay shows the quadtree structure: large cells in uniform areas, small cells where detail is preserved.
Officials at Elon Musk's company said the upper stage was lost after problems developed after lift-off from Texas on Thursday.，详情可参考体育直播
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