我将为以下目的学习Python编程语言:
代码
_, threshold = cv2.threshold(gray_roi, 3, 255, cv2.THRESH_BINARY_INV)
_, contours, _ = cv2.findContours(threshold, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
contours = sorted(contours, key=lambda x: cv2.contourArea(x), reverse=True)
错误(第二行)
Traceback (most recent call last):
File "/Users/hissain/PycharmProjects/hello/hello.py", line 17, in <module>
_, contours, _ = cv2.findContours(threshold, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
ValueError: not enough values to unpack (expected 3, got 2)
如何解决?