Method for automatically generating 3D model based on three-view aerial photos

The invention discloses a method for automatically generating a 3D model based on three-view aerial photos, comprising the following steps: sampling: carrying out sampling by using a plane carrying a three-lens camera to obtain 2D images in three directions; lens calibration: using a black-and-white checkerboard to calibrate the lenses, and providing correction conditions for the subsequent operation process; extracting and matching feature points to obtain a depth-of-field map of the feature points; generating a point cloud, matching accurate points in the images on the basis of the depth-of-field map after matching, uniformly covering the depth-of-field map with the points, and constituting a dense point cloud with the detail points; and carrying out spatial grid expansion on the dense point cloud, acquiring the 3D physical mechanism of the space through the point cloud, generating a grid, and acquiring textures from corresponding photos. By adopting the method of the invention, fewer aerial photos are needed, and the computation time is significantly reduced. The method has the characteristics of high precision, simple process, convenient operation, and strong sense of reality.