python - 如何正确使用 Feature2D(如 SimpleBlobDetector)？ (Python + OpenCV)

Question

我正在尝试使用一些简单的代码来运行 blob 检测:

img = cv2.imread(args["image"])
height, width, channels = img.shape

params = cv2.SimpleBlobDetector_Params()

params.filterByColor = True
params.blobColor = 0

blob_detector = cv2.SimpleBlobDetector(params)
keypoints = blob_detector.detect(img)

但是我不断收到以下错误:

Traceback (most recent call last):
  File "test2.py", line 37, in <module>
    keypoints = blob_detector.detect(img)
TypeError: Incorrect type of self (must be 'Feature2D' or its derivative)

有谁知道可能出了什么问题？

Answer 1

如果您的 OpenCV 版本是 2.x，则使用 cv2.SimpleBlobDetector()。否则，如果您的 OpenCV 版本为 3.x(或 4.x)，则使用 cv2.SimpleBlobDetector_create 创建检测器。

## check opencv version and construct the detector
is_v2 = cv2.__version__.startswith("2.")
if is_v2:
    detector = cv2.SimpleBlobDetector()
else:
    detector = cv2.SimpleBlobDetector_create()

## detect 
kpts = detector.detect(img)