1. A method for panoramic image completion, comprising: acquiring a panoramic image; obtaining a projected image by mapping each pixel coordinate of the panoramic image onto a polar coordinate system, wherein a long side component of the pixel coordinate is corresponding to a polar angle of the polar coordinate system and a short side component of the pixel coordinate is corresponding to a radial coordinate of the polar coordinate system; acquiring an incomplete region of the projected image, and obtaining a completed image by completing the incomplete region; and obtaining a completed panoramic image by inverse mapping each pixel coordinate of the completed image according to the polar coordinate system.