开发一个基于摄像头实时捕捉的AR交互应用，实现以下核心功能：通过计算机视觉技术同时检测用户面部和手部关键点，当检测到任意两根手指捏合手势时，触发人物主体的"荡漾水波+透明度渐变"双重视觉效果（透明度从100%降至30%），再次捏合则平滑恢复至原始状态。要求：使用MediaPipe或OpenCV实现低延迟（<50ms）的手势识别，水波扭曲效果需基于面部轮廓动态计算，支持Web端或移动端运行，确保在复杂光照和遮挡条件下保持识别稳定性。
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