Get angle of view of android camera device

Question

I want to know the angle of view from the camera, just like in this question but using android.hardware.camera2. How can I reproduce the next code using the new camera2 library.

Answer 1

You could do it mathematically.

You have:

• L, the width of an object
• d, the distance to the object

You want to calculate the angle a (alpha), the field of view.

Doing some trig:

tan(a/2) = (L/2)/d
tan(a/2) = L/2d
a/2 = atan(L/2d)
a = 2*atan(L/2d)

You can do that to calculate the horizontal field of view. Good luck!