Fig. 8

Overlap degree of feature points after registration using three GTMs. First column: the registration results based on the GTM established in this paper. Second column: the registration results based on the eight-parameter model. Third column: the registration results based on the projection model. The feature points in the box are not alignment. a–c The registration result of Fig. 5a and b, d–f The registration result of Fig. 5a and c, g–i The registration result of Fig. 5a and d