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already this little snippet throws (and you missed it in your notebook):

blob_detector = cv2.SimpleBlobDetector() 
keypoints = blob_detector.detect(None)

Traceback (most recent call last):
  File "src/ocv.py", line 7, in <module>
    keypoints = blob_detector.detect(None)
TypeError: Incorrect type of self (must be 'Feature2D' or its derivative)

you MUST use the create() function, to construct a valid detector:

blob_detector = cv2.SimpleBlobDetector_create()

please make sure, you use recent docs, anything 2.4 related will be harmful.

already this little snippet throws (and you missed it in your notebook):

blob_detector = cv2.SimpleBlobDetector() 
keypoints = blob_detector.detect(None)

Traceback (most recent call last):
  File "src/ocv.py", line 7, in <module>
    keypoints = blob_detector.detect(None)
TypeError: Incorrect type of self (must be 'Feature2D' or its derivative)

you MUST use the create() function, to construct a valid detector:

blob_detector = cv2.SimpleBlobDetector_create()

please make sure, you use recent docs, anything 2.4 related will be harmful. harmful.