OpenCV轮廓-需要两个以上的值来解压 [英] OpenCV Contours - need more than 2 values to unpack

问题描述

我正在尝试使用以下代码实现轮廓.

I am trying to implement contours using the following code..

im = cv2.imread('C:\Users\Prashant\Desktop\T.jpg')
imgray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(imgray,127,255,0)
image, contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
img = cv2.drawContour(im, contours, -1, (0,255,0), 3)
cv2.imshow('Image1',img)

但是我不断出现以下错误.

but i am continously getting the following error.

Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 540, in runfile
    execfile(filename, namespace)
  File "C:/Users/Prashant/.spyder2/.temp.py", line 17, in <module>
    image, contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
ValueError: need more than 2 values to unpack

函数findContours是否需要更多参数? 我该怎么做才能纠正它.

do the function findContours need more arguments? wht could i do to correct it.

推荐答案

在OpenCV 2中， findContours 仅返回两个值，contours和hierarchy.当python尝试将这两个值分配给该语句左侧给出的三个名称时，就会发生错误:

In OpenCV 2, findContours returns just two values, contours and hierarchy. The error occurs when python tries to assign those two values to the three names given on left in this statement:

image, contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

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