可以用iPhone和激光指示器测量距离吗? [英] Possible to measure distance with an iPhone and laser pointer?

问题描述

我想制作一个可以测量距离的手机应用程序.我想知道手机离手机有多远.假设我想知道一堵墙有多远...我想用手机告诉我.

I want to make this phone app that can measure distance. I want to know how far away something is from the phone. So let's say I want to know how far away a wall is...I'd like my phone to tell me.

那么这怎么工作?好吧，我可以将普通的红色激光指示器照在墙上(在黑暗中)，并使手机的摄像头看到"圆点.

So how might this work? Well, I can shine an ordinary red laser pointer against the wall (in the dark) and have the phone's camera "see" the dot.

电话离点越远，点越小.下图显示了距1英尺，5英尺，10英尺，20英尺和25英尺的点.我认为该应用程序可以然后测量点的大小，并确定点实际上离手机有多远.然后可以使用简单的比率或公式来确定其他尺寸的距离.

The further away the phone is from the dot, the smaller the dot will be. The picture below shows the dot from 1 foot, 5 feet, 10 feet, 20 feet, and 25 feet away. I think the app could then measure the size of the dot and figure out how far away the dot actually is from the phone. And then it could use a simple ratio or formula to determine distance for other sizes.

所以我的问题是:这可能对测量距离有用吗?

推荐答案

只要您能清楚地识别出激光点，我就会说:是的.我在进行识别时发现了问题. 距离测量只是一些数学和物理方面的东西(我不确定要用什么，但我认为可能存在一些有用的光学方面的东西……截取定理?)，或者您可以通过测试来创建算法"(但随后可以得出准确性)可能是一个问题;))

As long as you can clearly identify the laser dot I would say:Yes. I'm seeing the problem in doing the identifying. The distance measuring is just some maths and physics stuff (I'm not sure what to use but I think there is maybe some useful optics stuff... intercept theorem?) or you can create an "algorithm" by testing(but then accuracy could be a problem ;))

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