The invention discloses a narrow-view-field double-
camera image fusion method based on a large
virtual camera. The narrow-view-field double-
camera image fusion method comprises the steps of constructing the large
virtual camera according to two single cameras, and constructing geometric imaging parameters of the large
virtual camera according to geometric imaging parameters of the two single cameras; constructing corresponding geometric imaging models according to the geometric imaging parameters of the two cameras and the large virtual cameras; calculating and outputting a
rational polynomial model coefficient corresponding to the large virtual camera; respectively performing indirect-method geometric correction on images of the two single cameras according to a coordinate forward calculation process and a coordinate
back calculation process based on the geometric imaging models to obtain two images under an image coordinate
system of the large virtual camera, and obtaining a fused image of the large virtual camera. According to the narrow-view-field double-
camera image fusion method based on the large virtual camera, the concept of the large virtual camera is ingeniously used; high-precision fusion of the images of the two cameras in a narrow view field is realized, and the
rational polynomial model coefficient corresponding to the large virtual camera is supplied; furthermore, the
processing procedure is
fully automatic, and manual intervention is not needed; the narrow-view-field double-camera
image fusion method is applicable to a ground preprocessing procedure.