Python OpenCV - haveImageReader() function Last Updated : 03 Jan, 2023 Summarize Comments Improve Suggest changes Share Like Article Like Report In this article, we are going to learn about the haveImageReader() function of the OpenCV library. The haveImageReader() function is used to check whether specified images can be decoded or read successfully by OpenCV or not. Sometimes we need to detect if the specified image file is being correctly read before continuing. In such a case we can use this function. Syntax: return_value=cv2.haveImageReader(Image_File_Name) Parameter: Image_File_Name: Name of the image Return value: This method returns True if specified image read successfully otherwise it returns False. Example 1: We will use the following image in our code and check whether it can be read correctly or not. Sky.jpg Code: Python3 # Import OpenCV library import cv2 # Use haveImageReader() function to check # provided image file correctly read or not return_val = cv2.haveImageReader("Sky.jpg") # print the returned value print(return_val) Output: True Example 2: Now we will check what will be the output when we give the wrong image name. Python3 # Import OpenCV library import cv2 # Use haveImageReader() function to check # provided image file correctly read or not return_val = cv2.haveImageReader("rose.jpg") # print the returned value print(return_val) Output: False Comment More infoAdvertise with us Next Article OpenCV - imdecode() Function in Python P patildhanu4111999 Follow Improve Article Tags : Python OpenCV Python-OpenCV Practice Tags : python Similar Reads Python OpenCV - haveImageWriter() function In this article, we are going to learn about the haveImageWriter() function of the OpenCV library. haveImageWriter() function Sometimes we need to detect if the specified image file is being correctly written or not before continuing further, In such a case we can use OpenCV which helps us to proces 2 min read Python OpenCV - imencode() Function Python OpenCV imencode() function converts (encodes) image formats into streaming data and stores it in-memory cache. It is mostly used to compress image data formats in order to make network transfer easier. Basic example of imencode() FunctionExample 1: We began by importing the necessary librarie 2 min read Python OpenCV - getWindowImageRect() Function Python OpenCV getWindowImageRect() Function returns the client screen coordinates, along with the width and height of the window containing the picture. Syntax of cv2.getWindowImageRect() Syntax: cv2.getWindowImageRect(window_name) Parameter: window_name - Name of the window displaying image/video 3 min read OpenCV - imdecode() Function in Python cv2.imdecode() function is used to read image data from a memory cache and convert it into image format. This is generally used for loading the image efficiently from the internet. Example: Decoding and Saving an Image from URL in ColorThis example demonstrates how to download an image from a URL, d 2 min read Python OpenCV - moveWindow() Function When we show the image using the imshow() function output window will open at the center or default position of a computer screen. Even if there are multiple image windows all windows will be displayed at the same position and we have to move windows manually. If we want to show image windows at a s 2 min read Python OpenCV - namedWindow() Function Python OpenCV namedWindow() method is used to create a window with a suitable name and size to display images and videos on the screen. The image by default is displayed in its original size, so we may need to resize the image for it to fit our screen. Created windows are referred by their names and 3 min read Like