ones在opencv中报错，如何解决？(语言-python)

Question

这天，我把昨天未运行的代码运行了一遍，报错了。

import cv2
import numpy as np
import time
cam = cv2.VideoCapture('video/mouse.avi')
knn = cv2.createBackgroundSubtractorKNN()
while True:
    ok, img = cam.read()
    clean = img.copy()
    img = cv2.resize(img, (640, 480))
    if not ok:
        break
    sub = knn.apply(img)#去除背景
    erode = cv2.erode(sub, np.ones((5, 5)))#腐蚀杂点
    dilate = cv2.dilate(erode, np.ones(5, 5))#膨胀处理
    cnts,_ = cv2.findContours(dilate, 3, 2)
    for cnt in cnts:
        x, y, w, h = cv2.boundingRect(cnt)
        if x<380 and y>160 and 40<w<250 and 40<h<200:
            cv2.rectangle(img, (x, y, w, h), (0, 255, 0), 3)
            cut = clean[y:y+h, x:x+w]
            name = time.strftime('cars/%H%M%S.jpg')
            cv2.imwrite(name, cut)
    cv2.imshow('img', img)
    cv2.imshow('sub', sub)
    cv2.imshow('erode', dilate)
    if cv2.waitKey(100)>0:
        break
cam.release()
cv2.destroyAllWindows()

就是这段看起来没问题的代码，运行时报错了。

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-80b3d44bbaad> in <module>
     12     sub = knn.apply(img)#去除背景
     13     erode = cv2.erode(sub, np.ones((5, 5)))#腐蚀杂点
---> 14     dilate = cv2.dilate(erode, np.ones(5, 5))#膨胀处理
     15     cnts,_ = cv2.findContours(dilate, 3, 2)
     16     for cnt in cnts:

c:\users\win10\appdata\local\programs\python\python37\lib\site-packages\numpy\core\numeric.py in ones(shape, dtype, order)
    190 
    191     """
--> 192     a = empty(shape, dtype, order)
    193     multiarray.copyto(a, 1, casting='unsafe')
    194     return a

TypeError: Cannot interpret '5' as a data type

于是，我去网上搜索了结果，但是没有得到我说需要的。
请问，这是怎么回事？

Answer 1

你截图里第一个是对的，把5，5用括号括起来就可以了，把两个五写在一个参数里。报错的意思是他以为形状是5数据类型也是5