Hi all,

I have the following processed image:

Next, I want to know the orientation and scale of this particular dartboard. I know that a *theoretical dartboard* can be constructed as:

```
import cv2
import numpy as np
def draw_dartboard():
IMG = np.ones((400, 400), 'uint8') * 255
center = (int(IMG.shape[0] // 2), int(IMG.shape[1] // 2))
size_dartboard = int(340)
r_board = int(170)
r_db = int(6.35)
r_sb = int(15.9)
r_doubles = int(162)
r_triples = int(99)
width_rings = int(8)
cv2.circle(IMG, center, r_doubles + width_rings, (0,0,0), -1)
cv2.circle(IMG, center, r_doubles, (255,255,255), -1)
cv2.circle(IMG, center, r_triples + width_rings, (0,0,0), -1)
cv2.circle(IMG, center, r_triples, (255,255,255), -1)
thetas_min = np.radians([(18 * t - 9) for t in range(20)])
thetas_max = np.radians([(18 * t + 9) for t in range(20)])
for idx, (theta_min, theta_max) in enumerate(zip(thetas_min, thetas_max)):
if (idx % 2) == 0:
x_min = int(center[0] + r_board * np.cos(theta_min))
y_min = int(center[1] + r_board * np.sin(theta_min))
x_max = int(center[0] + r_board * np.cos(theta_max))
y_max = int(center[1] + r_board * np.sin(theta_max))
cv2.fillPoly(IMG, np.array([(center, (x_min,y_min), (x_max,y_max))]), (0,0,0))
cv2.circle(IMG, center, r_sb, (0,0,0), -1)
return IMG
```

I cannot share the output of the function because I can only include 1 image in this topic.

How can I â€śfitâ€ť the theoretical dartboard in the real image? Clearly, there is a mismatch in orientation and scale. Thank you