如何在Python OpenCV中读取图像

我试图在Python OpenCV中读取和显示图像

执行以下代码：

import cv2
import numpy as np
import matplotlib.pyplot as plt

img = cv2.imread('dumb.jpg', cv2.IMREAD_GRAYSCALE)

cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

导致以下错误：

cv2.1错误： C:\build\master\u winpack-bindings-win64-vc14-static\opencv\modules\highgui\src\window.cpp:325:错误：（-215）函数cv:：imshow中的size.width>0和size.height>0

如何解决这个问题

注意：我有执行此操作所需的所有先决条件（python 2.7、opencv 3.3）

---

matplotlib，numpy）

要使用OpenCV读取图像，必须使用以下Syntax。如果不起作用，说明安装有问题

import cv2

image = cv2.imread('path_of_the_image.png')

cv2.imshow('img', image)
cv2.waitKey(0)

你没有发布它给出的错误

编辑：我不明白负面的观点…关于什么？？？

有一个关于

使用图像的绝对路径，则没有路径问题

---

使用0而不是

cv2.IMREAD\u GRAYSCALE

，我会硬编码文件的位置，而不是像这样引用它。例如，如果文件位于C驱动器上，请输入

'C:\\Filename.jpg'

如果您试图使用matplotlib显示OpenCV图像，请使用下面的代码

import numpy as np
import cv2
import matplotlib.pyplot as plt
%matplotlib inline  # if you are running this code in Jupyter notebook

# reads image 'opencv-logo.png' as grayscale
img = cv2.imread('/path_to_image/opencv-logo.png', 0) 
plt.imshow(img, cmap='gray')

---

出现此错误消息的原因是cv2.imread（）无法找到正在查找图像的图像。如果将完整路径添加到图像中，这应该会起作用，如

img = cv2.imread('/home/foo/images/dumb.jpg',cv2.IMREAD_GRAYSCALE)

试试这个：

import cv2 as cv              #openCV-3.4.1
import numpy as np
import matplotlib.pyplot as plt
img = cv.imread('image path and name .file type ',0)
cv.imshow('img',img)
cv.waitKey(0)
cv.destroyAllWindows()

我写了一封信。您可以看到下面的代码段及其说明

import cv2 #Import openCV
import sys #import Sys. Sys will be used for reading from the command line. We give Image name parameter with extension when we will run python script

#Read the image. The first Command line argument is the image
image = cv2.imread(sys.argv[1]) #The function to read from an image into OpenCv is imread()

#imshow() is the function that displays the image on the screen.
#The first value is the title of the window, the second is the image file we have previously read.
cv2.imshow("OpenCV Image Reading", image)

cv2.waitKey(0) #is required so that the image doesn’t close immediately. It will Wait for a key press before closing the image.

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看起来你的代码很好。问题似乎在于参数中提供的图像尺寸。错误代码显示：

size>0&&width>0

。此条件未正确满足。尺寸

size

或

width

小于零。您可能需要检查任何其他图像并尝试使用该图像。

cv2.error:C:\build\master\u winpack-bindings-win64-vc14-static\opencv\modules\highgui\src\window.cpp:325:error:（-215）size.width>0&&size.height>0，在函数cv:：imshowdelete cv2.IMREAD\u灰度中，并使用双反斜杠设置图像的正确路径`\\`

import cv2 #Import openCV
import sys #import Sys. Sys will be used for reading from the command line. We give Image name parameter with extension when we will run python script

#Read the image. The first Command line argument is the image
image = cv2.imread(sys.argv[1]) #The function to read from an image into OpenCv is imread()

#imshow() is the function that displays the image on the screen.
#The first value is the title of the window, the second is the image file we have previously read.
cv2.imshow("OpenCV Image Reading", image)

cv2.waitKey(0) #is required so that the image doesn’t close immediately. It will Wait for a key press before closing the image.