How to read an image in Python OpenCV

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I am trying to read and display an image in Python OpenCV.

Executing the following code:

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()

Results in the following error:

cv2.error: C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\highgui\src\window.cpp:325: error: (-215) size.width>0 && size.height>0 in function cv::imshow

How to solve this?

NOTE: I have all the prerequisites needed to execute this (python 2.7, opencv 3.3 matplotlib, numpy)

@Nagaraj - If you are trying to display openCV image using matplotlib, use the code below.

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

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

Reading an image in OpenCV using Python, Python code to reading an image using OpenCV. import numpy as np. import cv2​. # You can give path to the. # image as first argument. img = cv2.imread(  How to Read Image using OpenCV in Python Python OpenCV. We will open an image by using OpenCV (Open Source Computer Vision). OpenCV-Python is the library of Install Python OpenCV. To work with OpenCV in Python, we have to install the opencv-python module. Type the following Python cv2.imread

Here is a short post to learn image reading with OpenCV in python. You can see the below code snippet with the description.

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.

How to read an image in Python OpenCV, @Nagaraj - If you are trying to display openCV image using matplotlib, use the code below. import numpy as np import cv2 import  brightness_4. code. # Python code to reading an image using OpenCV. import numpy as np. import cv2. # You can give path to the. # image as first argument. img = cv2.imread ('cc.jpg', 0) # will show the image in a window.

there is a tutorial on http://docs.opencv.org/3.1.0/dc/d2e/tutorial_py_image_display.html

 import numpy as np
 import cv2

 # Load an color image in grayscale
 img = cv2.imread('/path_to_image/messi5.jpg',0)

 # show image

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

use an absolute path to the image then you have no path problems

https://en.wikipedia.org/wiki/Path_(computing)#Absolute_and_relative_paths

OpenCV Error: (-215)size.width>0 && size.height>0 in function imshow

Reading an image using Python OpenCv module, In OpenCv module,we can use the function cv2.imread() to read an image. When inputting the image path, the image should be in the working  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.

To read an image with OpenCV you have to use the following synthax. If it doesn't work, there is a problem with the installation.

import cv2

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

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

You didn't post the error it gives..

EDIT: I don't understand the negative points...for what ??

OpenCV Python - Read and Display Image - Example, To read and display image using OpenCV Python, you could use cv2.imread() for reading image to a variable and cv2.imshow() to display the image in a  Reading Images. To read the contents of an image, we have a function cv2.imread(). The image should be in the same directory. If not, then the full path of the image should be given. The function takes two arguments : The first argument is the path of the image. The second argument is a flag that describes the way the image is read. The default is:

Use 0 rather than cv2.IMREAD_GRAYSCALE and I would hard code the location of the file rather than refer to it like that for example if it was on the C drive put 'C:\\Filename.jpg'

How-To: OpenCV Load an Image, See, the cv2.waitKey function pauses execution of our Python script and waits for a key press. If we removed Line 11, then the window containing  image = cv2.imread (filename, flags=cv2.IMREAD_COLOR) The flags option is used to control how the image is read. Let’s look at some common examples. In all the examples below, make sure you use the right namespace for C++ and import OpenCV for Python.

Getting Started with Images, Tutorial content has been moved: Getting Started with Images. Generated on Fri Jun 26 2020 03:53:43 for OpenCV by doxygen 1.8.13. Read an image¶ Use the function cv2.imread() to read an image. The image should be in the working directory or a full path of image should be given. Second argument is a flag which specifies the way image should be read. cv2.IMREAD_COLOR : Loads a color image. Any transparency of image will be neglected. It is the default flag.

OpenCV Python Tutorial For Beginners 3, To read an image in Python using OpenCV, use cv2.imread() function. imread() returns a numpy array containing values that represents pixel level data. General Way: pip install opencv-python Pycharm Users: Go to the project Interpreter and install this module from there. opencv-python Module: opencv-python is a python library that will solve the Computer Vision Problems and provides us various functions to edit the Images. Note: The edge Detection is possible only in grayscale Image.

Python OpenCV Read Image – cv2 imread(), The objective of this post is to explain how to read and display an image with Python and OpenCV. Introduction The objective of this post is to  Different types of image segmentation techniques and how to choose which one to use explained in detail using Python and OpenCV. Sign in 2019 · 5 min read. Python 3.5, opencv 4.1.0

Comments
  • cv2.error: C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\highgui\src\window.cpp:325: error: (-215) size.width>0 && size.height>0 in function cv::imshow
  • delete cv2.IMREAD_GRAYSCALE and put the right path to the image, using double back-slash `\\`
  • This is not an answer, use the comment section for comments like this