Improving the star map preprocessing method using the Sobel operator

Abstract

A modification of the star map preprocessing method based on the Sobel operator is proposed. Since the star tracker images are subjected to varying degrees of light scattering to eliminate the region of brightness at the center of the star, avoid the influence of star point overexpansion and retain more information about star points characteristics, edge detection and stylized morphological processing are performed. The improved method demonstrates good adaptability and accuracy in extracting reliable information. Keywords star map recognition, centroid extraction, scattered light, Sobel operator, morphology