Converting an image from Cartesian to Polar - Limb Darkening?

import numpy as np import cv2 from matplotlib import pyplot as plt img = cv2.imread('C:\\Users\\not my user name\\D...

Polar equation of perimeter of half ellipse (concave mirror shape)?

var x = Cx + a * Math.cos(ang); var y = Cy + b * Math.sin(ang); Cx, Cy are cords of center. ang is angle in radian...