手机上的TOF镜头是噱头还是未来趋势？
在智能手机快速崛起的这几年，首届解锁经历了数字密码、手势解锁、指纹识别到如今的主流面部识别，其中经过了多种技术更新迭代；譬如面部识别目前主要包括三种方案，分别是3D结构光、双目立体成像以及近期推出的TOF3D摄像头.
“TOF镜头是否有用？”这个话题最近比较火，我认为答案本身并不重要，存在既合理，说没用绝对是鲁莽且不理性的结论，但我们需要知道它具体的作用是什么？它在我们拍照和日常使用的时候能有什么好处？这才是重点。
什么是TOF？
TOF英文全称为Time of filght，译为飞行时间的意思或者红外景深传感器，是指从发射器发射光脉冲到达物体所用的时间，根据这个时间就可以计算出物体与发射器之间的距离，当测量点足够多的时候就能时下3D物体描绘。
TOF的工作原理是什么？
我们用最直白的说法来形容就是，它在工作的时候会向摄像头的方向发出一面“光墙”，当这面“光墙”遇到物体的时候，就会反射回来相应的光线，手机通过这些数据来判断这个物体距离我们有多远。
光的传播速度是很快的，但也是有不一样时间的，就算是0.0001秒，我们看不到，但相机可以捕捉到，当相机知道了画面结构，画面里每一个物体的距离，不就可以直接绘制出3D类似的立体图像了。
TOF的工作距离比结构光要远很多，所以比较是适合用在手机的后置摄像头中，结构光的工作距离非常近，所以一般都用在手机的前置摄像头用来进行人脸识别。
为什么说TOF镜头是手机发展的必要趋势？
想象一下这样的场景：未来的某一天，需要测量物体数据的你，只需要拿出手机，通过同TOF扫描物体实现空间建模、即可完成对物体详细数据的测量。而在日常网购中，你只需拿出手机“自拍一张”扫描出人体信息，即可定制个性化的衣服，鞋子，展示试穿衣服效果。
当然你也可以扫描家里的空间，直接摆放虚拟的家具，查看摆放效果。当5G时间来临后，你甚至可以开VR会议，通过TOF直接扫描创建一个虚拟的你，在VR回忆中和别人互动，由此看来，TOF技术一定会是未来手机发展方向之一。
华为搭载TOF镜头，精准的捕获景深信息，让影像更具层次感，体验更多趣味3D功能；而且它的专业级人像虚化，精细到每一根发丝，在TOF镜头下，你是永远的主角。
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