Python OpenCV imshow失败 [英] Python OpenCV imshow fails

问题描述

我在Ubuntu 14.04系统系统上使用以下方式安装了opencv

I installed opencv on my Ubuntu 14.04 system system with

pip install python-opencv

我的Python版本是2.7.14

my Python version is 2.7.14

import cv2
cv2.__version__

告诉我我具有OpenCV版本3.4.0.

tells me that I have the OpenCV version 3.4.0.

之后，我想按照OpenCV网站上的教程进行操作

After that I wanted to follow the tutorial on the OpenCV website

import numpy as np
import cv2 as cv
img = cv.imread('messi5.jpg',0)
print img

到现在为止一切正常，但是我应该输入

It works fine until this point, but then I am supposed to enter

cv.imshow('image',img)

，我收到以下错误消息:

and I get the following error:

QObject::moveToThread: Current thread (0x233cdb0) is not the object's thread (0x2458430).
Cannot move to target thread (0x233cdb0)

QObject::moveToThread: Current thread (0x233cdb0) is not the object's thread (0x2458430).
Cannot move to target thread (0x233cdb0)

QPixmap: Must construct a QApplication before a QPaintDevice

有人知道是什么问题吗?

Does anyone know what the problem is?

推荐答案

显然

pip install python-opencv

根本不起作用，不应使用.在我从他们的网站安装Opencv之后，它就起作用了

is not working at all and should not be used. After I installed Opencv from their website it worked

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