第二步，处理截图。下载下来之后先做去重——用 pHash 算法比较相邻截图的相似度，超过 90% 的跳过，只保留应用切换时的截图。去重后的截图做 OCR 识别。
Display: Liquid Retina display with 60Hz refresh rate and 500 nits of brightness
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that we can do it in user-space effectively gives us two stacks (one that we