确定来看智能手机摄像头的角度 [英] Determine angle of view of smartphone camera

问题描述

我试图确定现场-的观点令人难以置信的Droid智能手机的摄像头的程度大小。我需要知道该值以我开发的应用程序。有谁知道我可以找出/编程计算呢？

I'm trying to determine the degree size of the field-of-view of a Droid Incredible smartphone's camera. I need to know this value for an application that I'm developing. Does anyone know how I can find out/calculate it programmatically?

推荐答案

除非有一些API调用了（我不是一个Android程序员，我不知道），我只是想捕捉统治者从图片已知的距离，看到多少的标尺显示在画面，然后用三角找到像的这个：

Unless there's some API call for that (I'm not an Android programmer, I wouldn't know), I would just snap a picture of a ruler from a known distance away, see how much of the ruler is shown in the picture, then use trigonometry to find the angle like this:

现在你有两个距离L和D从图中。用一些简单的测角器，可以得到：

now you have the two distances l and d from the figure. With some simple goniometry, one can obtain:

黄褐色（α/ 2）=（​​1/2）/ d的，

tan(α/2) = (l/2)/d,

因此​​

α= 2 * ATAN（L / 2D）

α = 2*atan(l/2d)

所以这个公式就可以计算出水平场，视你的相机。当然，测量垂直f.o.v.变为完全相同的方式，只是然后需要查看的对象在其垂直位置。

So with this formula you can calculate the horizontal field-of-view of your camera. Of course measuring the vertical f.o.v. goes exactly the same way except that you then need to view the object in its vertical position.

然后你可以硬$ C C $它在你的程序中的常量。 （一个名为当然不变，所以它会很容易改变：磷）

Then you can hard-code it as a constant in your program. (A named constant, of course, so it'd be easy to change :-p)

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