When manufacturers state the "field of view" of a camera, is that including lens distortion or not? I work a lot with CCTV and dashcam footage which always has barrel distortion. For a given focal length and sensor size, you can calculate the theoretical field of view that a perfect lens, or a pinhole camera, would reveal. However, in reality, we see that light rays way outside the theoretical field of view get bent in towards the camera sensor and are visible in the final image, especially at image corners.
When manufacturers state FOVh and FOVv, does this ever include camera distortion? For example, do they simply look at the footage from the camera from a known position, figure out where the pixel on the left-middle edge of the frame is in 3D space, calculate FOVh from that, and then do the same with the upper-most middle pixel to get FOVv? I feel that I have seen some specs where that appeared to be the case.
Edit: As an example I wanted to include some specs from these dashcams.
Take the 750 series cameras. After a camera calibration using computer vision techniques, I find the theoretical field of view for the undistorted image to be:
FOVh = 85.4 deg, FOVv = 54.9 deg, and FOVd = 93.3 deg.
But, the listed specs are:
FOVh = 116 deg, FOVv = 61 deg, and FOVd = 139 deg.
The only way that these field of view specs make any sense is if they are for the distorted image. Is that correct? And therefore, you cannot calculate the focal length knowing sensor size from these FOV values.