An image processing method includes: obtaining an image that includes a ball image and a cone image obtaining an estimate of a center of the ball image converting the image to a converted image using a processor based at least in part on the estimate of the center of the ball image, wherein the converted image comprises a converted ball image that looks different from the ball image in the image, and a converted cone image that looks different from the cone image in the image identifying the converted ball image in the converted image and analyzing the converted ball image to determine a score that represents an accuracy of the estimate of the center of the ball image.
