Patent ID: 8717632

Claim:
An image processing method, comprising: obtaining a vanishing point on a curved surface in a two-dimension image obtained by an imaging apparatus; extracting all the straight lines between the vanishing point and a longer one of a top contour line and a bottom contour line of the curved surface by a width in a specific unit on the curved surface, the straight lines being adjacent to each other and intersecting at the vanishing point; removing a perspective distortion of the curved surface so that the intersecting straight lines become parallel straight lines; obtaining lengths of straight line segments of the straight lines between the top contour line and the bottom contour line and obtaining a true width of each of the straight line segments in a three-dimension space and a depth increment of the straight line segment according to the lengths; obtaining an expanded width of each of the straight line segments according to the true width and the depth increment; summing the expanded widths of all the straight line segments into the total expanded width of the curved surface in order to transform the curved surface into a flat surface; and transforming image contents on the curved surface onto a flat surface according to a correspondence relationship between points on the curved surface and points on the flat surface.