def is_within_directory(directory, target):
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，更多细节参见电影
espflash -port /dev/ttyUSB0 -offset 0x10000 -chip esp32s3 app.bin，更多细节参见PDF资料
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.