OpenCV return keypoints coordinates and area from blob detection, Python

Question

I followed a blob detection example (using cv2.SimpleBlobDetector) and successfully detected the blobs in my binary image. But then I don\'t know how to extract the

Answer 1

If you have a list of keypoints. Then you can print as shown below

for keyPoint in keyPoints:
    x = keyPoint.pt[0]
    y = keyPoint.pt[1]
    s = keyPoint.size

Edit: Size determines the diameter of the meaningful keypoint neighborhood. You can use that size and roughly calculate the area of the blob.

Answer 2

The pt property:

keypoints = detector.detect(frame) #list of blobs keypoints
x = keypoints[i].pt[0] #i is the index of the blob you want to get the position
y = keypoints[i].pt[1]

Some documentation