We actually took the time to do the trig out for the offset. You can take a look at our function
https://github.com/FRC125/NU16/blob/...lator.java#L31 you will just need to now the fov, dimensions of image, height of camera, x,y offset of camera in inches and angle of the camera.
Your offset basically changes based on the distance to the target. You use the y coordinate of the target to calculate this distance.