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.
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根据现场体验，S26 Ultra 可以设置在出现密码键盘、指定 app 内以及所有弹窗类通知时，全自动启用防窥模式，将可视角度缩窄到手机正面大约 80 度的范围内——
However, the company said on Tuesday the offending notification would have only been seen by a small number of users and that it was removed quickly.，更多细节参见搜狗输入法2026
The company is also using Gemini to bring on-device Scam Detection for calls to Samsung’s Phone app. The tool alerts users if someone on their call is using speech patterns commonly heard from scammers. Google says the feature is never used while on a call with someone in your contacts and is off by default.