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Q: 

How to calculate the Horizontal FOV of the image?

Hi,

I want to calculate the Horizontal FOV (HFOV) of the image using the EXIF information of the image. (Images are taken from different cameras.)

http://www.worldserver.com/turk/quicktimevr/calculators.html#EXIF

http://www.ehow.com/how_6640554_calculate-field-camera-lens.html

http://en.wikipedia.org/wiki/Angle_of_view

All these are used to calculate the FOV. But the parameters used are not present in the exif properties of all the images from different cameras.

Regards, Dhana.

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