Python说“trackerMediaFlow_create（）”不再是cv2的属性了，库更新了吗？

Question

Python说trackerMediaFlow_create（）不再是cv2的属性。在

我看过这里，但不一样：OpenCV, How to pass parameters into cv2.TrackerMedianFlow_create function? 我问过几个不和谐的服务器，但都没有成功。 我用ctrl+c直接从课本上复制了这段代码，所以它应该是精确的。在

import cv2
import numpy as np

cap = cv2.VideoCapture("../data/traffic.mp4")
_, frame = cap.read()

bbox = cv2.selectROI(frame, False, True)

cv2.destroyAllWindows()

tracker = cv2.TrackerMedianFlow_create()
status_tracker = tracker.init(frame, bbox)
fps = 0

while True:
    status_cap, frame = cap.read()
    if not status_cap:
        break

    if status_tracker:
        timer = cv2.getTickCount()
        status_tracker, bbox = tracker.update(frame)

    if status_tracker:
        x, y, w, h = [int(i) for i in bbox]
        cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 15)
        fps = cv2.getTickFrequency() / (cv2.getTickCount() - timer);
        cv2.putText(frame, "FPS: %.0f" % fps, (0, 80), cv2.FONT_HERSHEY_SIMPLEX, 3.5, (0, 0, 0), 8);
    else:
        cv2.putText(frame, "Tracking failure detected", (0, 80), cv2.FONT_HERSHEY_SIMPLEX, 3.5, (0,0,255), 8)

    cv2.imshow("MedianFlow tracker", frame)

    k = cv2.waitKey(1)

    if k == 27: 
        break

cv2.destroyAllWindows()

我的问题是：

^{pr2}$

直到代码运行为止。在

Traceback (most recent call last):
  File "D:/Documents/E-Books/Comp Vision/opencv3computervisionwithpythoncookbook_ebook/OpenCV3ComputerVisionwithPythonCookbook_Code/Chapter04/myPart5.py", line 11, in <module>
    tracker = cv2.TrackerMedianFlow_create()
AttributeError: module 'cv2.cv2' has no attribute 'TrackerMedianFlow_create'

我希望它能正常工作。在

Answer 1

TrackerMedianFlow是一个module within the opencv-contrib package，并不是官方OpenCV发行版的标准。您需要安装opencv contrib包才能访问TrackerMedianFlow_create()

根据documentation，您应该在没有附加模块的情况下卸载该软件包，然后继续使用所需的其他模块重新安装opencv。在

pip uninstall opencv-python
pip install opencv-contrib-python