"field of view" measurement

Question

itai 2013-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/110747-field-of-view-measurement

评论： Ian Chua 2020-5-5

Hi everybody,

I need to neasure the "field of view" of thermal and day camera. I have all the consumed test equipment, what the algorithm i need for measurement the FOV?

thank you, itai

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Answer 1

Image Analyst 2013-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/110747-field-of-view-measurement#answer_119386

spatial_calibration_demo.m

See my attached spatial calibration demo.

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Image Analyst 2020-5-5

I think it answers the question. He has an image from a camera, and asks what the field of view is. So you basically have to have something of known size in the scene. Then you can measure that known thing in pixels and, once you have that, you can get a spatial calibration factor in units of centimeters (or whatever real world units you're using) per pixel. So now whenever you measure something you can multiply by that factor to get distances in real world units instead of in pixels.

If you have a known field of view that you want, you can either put something in the field of view (like a meter stick) and move your camera toward or away from it until it fills the field of view. Or if you need to decide on a lens to get, there are mathematical equations you can plug parameters (like field of view and working distance) into to get the focal length of the lens you should buy. Your imaging vendor should be able to help you with that. Just tell them the camera you're using (because they need to know the sensor size), and your desired field of view, and your desired working distance (lens-to-scene distance) and they'll be able to tell you what lens to buy.

Ian Chua 2020-5-5

Got it... looks like the FOVs are approached differently because of different applications. In my case, the FOV needs to be pre-determined beforehand in order to ascertain the appropriate distance between the camera and the plane containing the FOV. But interesting!

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