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android android-camera camera

How to measure height, width and distance of object using camera?

I referred lot many links but still I am not able to get any point from that I can start my development. I want to measure my image height, width and distance using camera. I found this app . I want to make this type of application not exactly same but quite same but for my requirement I want to measure my image height, width and distance using camera.

Can anyone give me/suggest me the right way or any example so that I can get more idea about this requirement.

I tried this :

http://android-er.blogspot.in/2012/04/gets-distances-from-camera-to-focus.html