measure_fov.py

import numpy as np

from scipy.spatial.distance import cdist
import camera_models as cm

CORE = "Pupil Cam1 ID2"
PI = "PI world v1"

FHD = 1920, 1080
HD = 1280, 720
VGA = 640, 480
SQR = 1088, 1080

model_wide_lens_fhd = cm.Camera_Model.from_default(CORE, FHD)
model_wide_lens_hd = cm.Camera_Model.from_default(CORE, HD)
model_wide_lens_vga = cm.Camera_Model.from_default(CORE, VGA)
model_pi = cm.Camera_Model.from_default(PI, SQR)

points = [(1088 / 2, 0), (1088 / 2, 1080)]
res = model_pi.unprojectPoints(points)
fov_cos = 1.0 - cdist([res[0]], [res[1]], metric="cosine")
fov_cos = np.rad2deg(np.arccos(fov_cos))
print("Vertical FOV Option 1:", fov_cos.item())


points = [(0, 0), (0, 1080)]
res = model_pi.unprojectPoints(points)
fov_cos = 1.0 - cdist([res[0]], [res[1]], metric="cosine")
fov_cos = np.rad2deg(np.arccos(fov_cos))
print("Vertical FOV Option 2:", fov_cos.item())