1. An analysis method for automatically analyzing a shooting accuracy of an electronic spotting scope, comprising: obtaining, using the electronic spotting scope, an optical image containing a target paper, wherein the target paper contains one or more points of impact; converting the optical image into an electronic image; extracting a target paper area from the electronic image; subtracting an electronic reference target paper from the target paper area to detect one or more points of impact; calculating a center point of each of the one or more points of impact; and determining the shooting accuracy according to a deviation between the center point of each of the one or more points of impact and a center point of the target paper area, wherein the subtracting step comprises: subtracting the electronic reference target paper from the target paper area to obtain a pixel difference image that indicates a difference at a pixel-level between the target paper area and the electronic reference target paper, wherein the electronic reference target paper is an electronic image of the target paper without a most recent point of impact; subjecting the pixel difference image to contour tracing to obtain a contour of the most recent point of impact; and calculating a center of the contour of the most recent point of impact to obtain a center point of the most recent point of impact.