How can I get the minimum enclosing circle with OPENCV?

Question

I\'m using cv::minEnclosingCircle(...) in order to get the minimum circle that exactly evolves my contour, but I\'m getting a circle a little big bigger.

In

Answer 1

My result is OK.

---

1. for only one region

## only one region
cnts = cv2.findContours(threshed, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)[-2]

(x,y), r = cv2.minEnclosingCircle(cnts[0])

---

2. for more than one region

## more than one region
mask = threshed.copy()

## find centers 
for cnt in cnts:
    (x,y), r = cv2.minEnclosingCircle(cnt)
    pt = (int(x), int(y))
    centers.append(pt)

## connect the `centers`
for i in range(1, len(centers)):
    cv2.line(mask, centers[i-1], centers[i], 255, 2)

## find the center 
cnts = cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)[-2]
(x,y), r = cv2.minEnclosingCircle(cnts[0])