Analysis method of electronic spotting scope for automatically analyzing shooting accuracy

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.

2. The analysis method according to claim 1 , further comprising correcting an outer contour of the target paper area to a circular shape using perspective correction after the extracting step and before the subtracting step.

3. The analysis method according to claim 2 , wherein the perspective correction comprises:

obtaining an edge of the target paper area by using a Canny operator;

performing maximum elliptical contour fitting on the edge by using Hough transform to obtain a maximum elliptical equation;

performing straight line fitting of cross lines on the edge by using the Hough transform to obtain points of intersection with an uppermost point, a lowermost point, a rightmost point and a leftmost point of the maximum elliptical contour;

combining the uppermost point, the lowermost point, the rightmost point, and the leftmost point of the maximum elliptical contour with four points at the same positions in a perspective transformation template to obtain a perspective transformation matrix; and

performing perspective transformation on the target paper area by using the perspective transformation matrix.

4. The analysis method according to claim 1 , wherein the extracting step comprises:

filtering the electronic image to eliminate grid interference on the target paper;

segmenting the filtered electronic image into a background and a foreground by using an adaptive Otsu threshold segmentation method according to a gray property of the electronic image; and

determining a minimum contour using a vector tracing method and a geometric feature of a Freeman link code according to the image segmented into the foreground and background to obtain the target paper area.

5. The analysis method according to claim 1 , wherein the electronic reference target paper is an electronic image of a blank target paper or a target paper area that is previously extracted.

6. The analysis method according to claim 1 , wherein the deviation comprises a longitudinal deviation and a lateral deviation.

7. The analysis method according to claim 1 , wherein the electronic spotting scope comprises an exterior structure, an internal portion of the exterior structure defines an accommodating space, and the accommodating space houses a field of view unit, an electro-optical conversion device, a CPU processing unit, a display unit, a power supply, and a wireless transmission unit.

8. The analysis method according to claim 7 , wherein the electronic spotting scope has an accuracy analysis module, wherein the accuracy analysis module is configured to analyze a shooting accuracy by adopting the analysis method.