效果图：

代码： 

import cv2
img=cv2.imread('2621.jpg')
if img.shape[1] > 15000:
    x_scale = 15000 / img.shape[1]
    img = cv2.resize(img, None, fx=x_scale, fy=x_scale, interpolation=cv2.INTER_AREA)
height,width=img.shape[:2]
thickness = 1
lineType = 4
points=[[0,0,width,height]]
points.append([0,0,width//2,height//2])
points.append([width//2,0,width,height//2])
points.append([0,height//2,width//2,height])
points.append([width//2,height//2,width,height])
for point in points:
    x1,y1,x2,y2=point
    ptStart = (x1, y1)
    ptEnd = (x2,y2)
    lines=[[(x1, y2),(x2,y1)]]
    lines.append([(x1, y1),(x2,y2)])
    lines.append([(x1, (y1+ y2)//2),(x2, (y1+ y2)//2)])
    lines.append([((x1+x2)//2, y1),((x1+x2)//2,y2)])
    for data in lines:
        cv2.line(img, data[0], data[1], (0, 0, 255), thickness, lineType)
cv2.imwrite("result.jpg",img)
# cv2.imshow("sadf",img)
# cv2.waitKey()