I'm trying to dewarp a fisheye image into a simple rectilinear image of a subset of the fisheye. As part of this, I'm trying to map the azimuth/altitude values into a point on the image.
The points around each meridian line are equidistant so I can't use a squashed circle and simple angles from the centre point won't fit. The two axis are also linear (in this projection)
Using the law of cosines, I can calculate the radial angle out from the optical axis, but I can't figure out how to calculate the angle around the axis.
How can I convert from the azimuth/altitude values (e.g. -40,40) to a pixel location (e.g. 190,157)?