1. An image processing method, including: estimating corners of a contour of an object area in an obtained image; searching for contour lines of the object area between every two points which are offset from the estimated corners within a predetermined degree along a direction away from the object area respectively, and determining intersection points of the contour lines as final corners of the contour of the object area; and determining contour lines between the final corners as a final contour of the object area.