A self-adjustive geometric correction method for seriously oblique aero image

The projection errors caused by curvature of the earth and relief are two important problems in geometric correction, especially in the case of imaging with large view angles. General polynomial correction model is only effective to flat area and ineffective to correct projection errors caused by both curvature of the earth and relief. According to the generated characteristic of the projection errors, this paper proposes a self-adjustive polynomial model which adds an adjustive factor in the large view angle direction to make effective correction on distorted images with both kinds of projection errors in the absence of precise attitude parameters. This paper first analyzes the principle of projection errors caused by curvature of the earth and relief, and then proposes the improved polynomial model. Experiments show that the proposed model has greatly improved accuracy for correcting the projection errors in the large angle direction compared with general polynomial models.