Orthoimage rapid generation method based on scene aerial image and sparse point cloud

The invention relates to the technical field of image processing and environment modeling simulation, and provides a rapid orthoimage generation method based on a scene aerial image and sparse point clouds. The rapid orthoimage generation method comprises the following steps: generating sparse point cloud and a camera pose by using an aerial image; correcting the camera point cloud and the sparse point cloud and obtaining a preliminary mapping graph; partitioning the preliminary mapping graph and finding an original point cloud and an aerial photo corresponding to each block; finding an aerial image most suitable for the block mapping image and carrying out texture mapping; and combining block mapping results to obtain an orthoimage. According to the invention, the ortho-image is generated through the aerial image, no professional equipment needs to be purchased, the limitation is greatly reduced, and the method is more economical and practical; the generation of the orthoimage can be completed only by using