Question

基本上，我有这个代码可以检测后台的变化并将它们装箱。当我运行代码时，我收到此错误：

Traceback (most recent call last):
  File "cam2.py", line 28, in <module>
    vertices = cv2.boundingRect(list(contours))
TypeError: points is not a numpy array, neither a scalar

代码：

import cv2
import numpy as np

c = cv2.VideoCapture(0)
_,f = c.read()

avg1 = np.float32(f)

while(1):
    _,f = c.read()

    cv2.accumulateWeighted(f,avg1,0.1)

    res1 = cv2.convertScaleAbs(avg1)

    absdiff = cv2.absdiff(f,res1)

    graydiff = cv2.cvtColor(absdiff, cv2.COLOR_BGR2GRAY)

    retval, mask = cv2.threshold(graydiff, 50,255,cv2.THRESH_BINARY) 

    mask = cv2.dilate(mask, None, 18)
    mask = cv2.erode(mask, None, 10) 

    contours = cv2.findContours(mask, cv2.RETR_LIST, cv2.CHAIN_APPROX_NONE) #not right

    while contours:
        vertices = cv2.boundingRect(list(contours))
        interest = vertices

        point1 = (interest[0], interest[1])

        point2 = (interest[0] + interest[2], interest[1] + interest[3])
        cv2.rectangle(f, point1, point2, cv2.RGB(255,0,0), 1)
        cv2.rectangle(mask, point1, point2, cv2.RGB(255,255,255), 1)

        contours = contours.h_next()

    cv2.imshow('mask',mask)

    cv2.imshow('img',f)
    cv2.imshow('avg1',res1)

    k = cv2.waitKey(20)

    if k == 27:
        break

cv2.destroyAllWindows()
c.release()

我该如何解决这个问题？感谢。

Answer 1

根据findContour文档，它返回两件事：

cv2.findContours(image, mode, method[, contours[, hierarchy[, offset]]]) → contours, hierarchy

将行更改为：

contours, hierarchy = cv2.findContours(mask, cv2.RETR_LIST, cv2.CHAIN_APPROX_NONE)

那可能有用！

Answer 2

轮廓实际上是一个双阵列。外部轮廓是轮廓列表，内部轮廓是单个轮廓的点。

所以，替换：

while contours:
    vertices = cv2.boundingRect(list(contours))

使用：

for cnt in contours:
    vertices = cv2.boundingRect(cnt)

并删除

contours = contours.h_next()

行（您可能将cv2与旧的c-api / cv方法混淆，后者在引擎盖下使用链接列表）

Opencv TypeError：points不是一个numpy数组，也不是标量

2 个答案: