Python OpenCV imshow失败了

Question

我在我的Ubuntu 14.04系统系统上安装了opencv

pip install python-opencv

我的Python版本是2.7.14

import cv2
cv2.__version__

告诉我，我有OpenCV版本3.4.0。

之后我想按照OpenCV网站上的教程进行操作

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

它一直工作到这一点，但后来我应该进入

cv.imshow('image',img)

我收到以下错误：

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

有谁知道问题是什么？

Answer 1

尝试检查您正在阅读的图像是否正在加载

image = cv2.imread(filepath,0) #0 for gray scale
if image is None:
    print "Cant Load Image"  
else:
    cv2.imshow("Image", image)
    cv2.waitKey(0)

Answer 2

显然地

pip install python-opencv

根本不工作，不应该使用。我从他们的网站安装Opencv后就可以了