Auroral oval is very important for the study of magnetic structures and energy storage. This paper proposes a segmentation algorithm of aurora image based on region growing. Firstly, it raises the concept of original image pretreatment according to the characteristics of aurora image. Based on the gray characteristics of pretreatment image, it also needs to select a group of the representative seed points in object region. Secondly, adopting the OTSU and determining the best adaptive segment threshold conve...