1. An image processing method, for generating coordination calibration points, the image processing method generating a plurality of coordination calibration points according to a first image, a second image, and a third image, the image processing method comprising the steps of: subtracting the first image from the second image to generate a first subtracted image; subtracting the first image from the third image to generate a second subtracted image; performing an edge detection processing for the first subtracted image to generate a first edge image, wherein the first edge image comprises a first edge, wherein the first edge comprises a plurality of first edge pixels; performing the edge detection processing for the second subtracted image to generate a second edge image, wherein the second edge image comprises a second edge, wherein the second edge comprises a plurality of second edge pixels; generating an intersection point pixel according to the first edge and the second edge, the intersection point pixel serving as a coordination calibration point corresponding to the first edge and the second edge; calculating a neighboring pixel number corresponding to each of the plurality of first edge pixels according to the plurality of first edge pixels and the plurality of second edge pixels; determining whether the first edge pixel is the accurate intersection point pixel according to the neighboring pixel number corresponding to the first edge pixel; and generating the intersection point pixel according to the plurality of accurate intersection point pixels.