this needs more debugging details. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. There is some mistake in line 11 where you made the break condition. @skudev That's too bad :( Have you used the cv2.imwrite() method before? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. If the window was created with the cv::WINDOW_AUTOSIZE flag, the image is shown with its original size, however it is still limited by the screen resolution. So a workaround for this is to add destroyAllWindows task to the queue and delay it. Python version: Python 3.. It happens sometimes in spyder ipython console and opencv. video_capture = cv2.VideoCapture(0). For example, Python IDE just blocks our code to execute (like any other Python/C++ debuggers). cv2.imshow () method is used to display an image in a window. The below code works if you run it as a .py file (source: https://www.learnopencv.com/read-write-and-display-a-video-using-opencv-cpp-python/). What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? downgrade to the previous release which uses manylinux1 (4.2.0 and 3.4.9) use some proper GUI framework to display the images such as PyQt5. As soon as the window opens, it closes, I am not able to even see the images properly. 0 means waiting infinitely until any event occurs and anything above zero means waiting for that many miliseconds. Try cv2.waitkey(1): It should wait for 1 millisecond and then display the next image. I appreciate the opencv work. Ready to optimize your JavaScript with Rust? I had this problem,too. Do bracers of armor stack with magic armor enhancements and special abilities? It works if not using ipython notebook. You might need to find a way to break the look without using the keypress value yeilded from waitkey. cv2.imshow (window_name, image) This is the general syntax for our function. cv2.waitKey(0) will display the window infinitely until any keypress. gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) import cv2 But it won't work if you are changing the image presets, like changing it into Grayscale. macOS Monterey, this should work. In the next section we will look at the various parameters associated with it. ***> wrote: How to make voltage plus/minus signs bolder? If you have opencv-python-headless installed try this : I am running system: OpenCV 4.6.0, Also if you want to close your output window, don't close it using the red cross button, but instead press any key on the keyboard. However after the first run the picture shows up for a quarter of a sec and then disappears. What led to this? What could be the issue here? Central limit theorem replacing radical n with n. How many transistors at minimum do you need to build a general-purpose computer? As per title cv2.imshow(img) is crashing the server. Should teachers encourage good students to help weaker ones? Everything works fine except I get title-bar-only windows. Should teachers encourage good students to help weaker ones? Your email address will not be published. 2019-11-05 01:00:35 -0500. Python 3.5.2 This solved for me. value i have deduced that works well. What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? Do bracers of armor stack with magic armor enhancements and special abilities? The above code is running perfectly fine!! In the top code, the host is our input image that we want to display. Not the answer you're looking for? It's nearly impossible to work with. img = cv2.imread('img.png') # cv2.imshow('image',img) This worked for me after I installed opencv-python, opencv-python-headless. on my M1 MacBook Air. Could it be that you'll need to add cv2.destroyAllWindows() to the end of your code? The second argument is a flag that describes the way the image is read. I can prepare you for your future dream job. call. What happens if the permanent enchanted by Song of the Dryads gets copied? # Write the frame into the file 'output.avi', # When everything done, release the video capture and video write objects. what about cv2.waitKey(1). The best solution for this problem is using matplotlib for displaying the image. How to use OpenCV imshow () in a Jupyter Notebook Quick Tip | by Mr Data Insight | Medium Sign In Get started 500 Apologies, but something went wrong on our end. Example videocapture_basic.cpp immediately crashes after opening the webcam. On Jun 13, 2018, at 5:33 AM, Harsh Thaker ***@***. Why do some airports shuffle connecting passengers through security again. describe precisely what you do. Japanese girlfriend visiting me in Canada - questions at border control? # Default resolutions of the frame are obtained.The default resolutions are system dependent. Ready to optimize your JavaScript with Rust? It seems the issue is isolated to the Notebook's iffy interaction with the Python GUI. cv2.imshow () function takes any size of NumPy array and shows the image in the same size in the window. 0 means waiting infinitely Environment: python 3.7 on windows 10 family. Kite is a free AI-powered coding assistant tha. Find all files in a directory with extension .txt in Python. No rational user would ever expect an innocent command like cv2.imshow() to totally crash their Jupyter session and freeze their OS. This is not the right way fr breaking video read loop in opencv it will not work . This tracker is for issues and bugs that needs fix in OpenCV. Which shows the NumPy array in the form of an Image. updated rev2022.12.11.43106. Asking for help, clarification, or responding to other answers. How can I use a VPN to access a Russian website that is banned in the EU? @arpit1997 + others - I'm getting a similar issue when trying to run the example code from the OpenCV documentation for capturing video from camera, in an interactive python session (ipython/jupyter notebook). cv2.imshow('image', im) By clicking Sign up for GitHub, you agree to our terms of service and what are you talking about? How can you know the sky Rose saw when the Titanic sunk? We need to create a VideoWriter object. Honestly have no idea. The post below gives a possible explanation for why this is happening pythonw.exe is not responding " Basically, don't do this from IDLE. there is no queue. OpenCV program in python to demonstrate imshow () function to read an image using imread () function and then display the same image using imshow () function by creating a window and specifying the name for the window and display it as the output on the screen: #importing the module cv2. ***> wrote: Mathematica cannot find square roots of some matrices? 2. cv2_imshow(img) Popularity 8/10 Helpfulness 5/10. how should I overcome this error? You can play around with many other OpenCV functions. I'm using wsl2 and VScode as the editor. the use of the waitkey call is to take any key input while showing the frames. The image appears and the next minute disappers. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? How to make voltage plus/minus signs bolder? break. Why is the federal judiciary of the United States divided into circuits? I kill the terminal using the button in the VSCode terminal. Connect and share knowledge within a single location that is structured and easy to search. build OpenCV wheel locally and use it, instructions are in the readme: https://github . your video playback probably freezes because you have 0 in your waitkey call. How do I install a Python package with a .whl file? failing to play the whole video using cv2. Can virent/viret mean "green" in an adjectival sense? 2. image: This parameter represents the image that we want to be displayed. All the code suggestions in this thread did not help. I followed this guide to get my env working: http://www.pyimagesearch.com/2016/11/28/macos-install-opencv-3-and-python-2-7/ So, from the beginning, just kill the terminal instead of pressing any key. unable to build 2.4 w/ Java support on OSX, cv2.imshow freezes after trying to close it on MacOs, Creative Commons Attribution Share Alike 3.0. The very same example works with opencv from the debian repository. The function imshow displays an image in the specified window. Hey please help me, I am facing problem while running my program. Can virent/viret mean "green" in an adjectival sense? "queue"? This problem started today after running successfully for many weeks. Usage questions should go to Users OpenCV Q/A forum: http://answers.opencv.org To put the text on images, use cv2.puttext () and if you want to leave spacing between the images shown, use cv2.copyMakeBorder (). the cv2 docs say that 0 means it will wait infinitely until any OpenCV: 4.1.0 I'm not sure which is more ridiculous: the nature of this bug, or the guy who thinks this is legitimately not a bug. cap = cv2.VideoCapture(0) Where does the idea of selling dragon parts come from? Hope these little tips solve your error. launching from iTerm2 if cv2.waitKey(0): The same thing works fine on my friends computer. Any idea what could be causing this? The function may scale the image, depending on its depth: In this entire tutorial, I am using two main python modules. I hope other people can help to find the root cause. as it stands, this can't be reproduced. Why would Henry want to close the breach? The following are 30 code examples of cv2.imshow(). Thank you @sarveshkhandu , @alalek. I'm using MacOS 10.12.5, Anaconda 4.4.0, and installed OpenCV 3 based on instructions from http://www.pyimagesearch.com/2016/11/28/macos-install-opencv-3-and-python-2-7/ . C++ (Cpp) cv::imshow - 4 examples found. It hangs. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Sample by @propellerhat with "window with no content" problem probably related to empty imshow() input (from PIL.ImageGrab). 1. xxxxxxxxxx. After cv2.resize and cv2.cvtColor, cv2.imshow freezes but matplotlib.pyplot.imshow is working though grayscale still shows colors, Try the same on Jupyter Notebook? open a powershell or cmd terminal, or whatever's required to deal with WSL2, if your python and opencv were installed in the guest OS (they can run perfectly fine on windows natively, so you should not involve WSL2 at all). Nah, I don't think I have.. To learn more, see our tips on writing great answers. Should I exit and re-enter EU with my EU passport or is it ok? How can you know the sky Rose saw when the Titanic sunk? Syntax: cv2.imshow (window_name, image) Parameters: window_name: A string representing the name of the window in which image to be displayed. Here is the code I'm running: I tried toying around with a few things (like having no bbox, calling imshow and waitKey() just once, etc.). cv2.imshow uses your IDLE window to give output of your camera/video player feed. cv2.startWindowThread(). to your account, When I call for imshow() from python it automatically freeze. it always happen when i try for reading video file or using VideoCapture() please try to help me. this is my code. Also, I doubt anybody is gonna put in a fix Dual EU/US Citizen entered EU on US Passport. Since I couldn't find any solution online, I decided I will write this post, either for the George of the future or for anyone else that might face the same problem! Programming Language: C++ (Cpp) Class/Type: cv Method/Function: imshow Examples at hotexamples.com: 4 Have a question about this project? As increase in waitKey() parameter with natural numbers , it freezes(Waits) for number of milliseconds to display next frame. cv2.imshow () function is opening a window that always says not responding - python opencv (11 answers) Closed 9 months ago. Lastly, the frame size should be passed. cv2.destroyAllWindows(). No solution I've seen works, including all mentioned here. I had the same issue and was able to fix it by updating my WSL version here: Thanks for contributing an answer to Stack Overflow! cv2.waitKey(0) Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Are you sure the image path is correct, and. It works for me.. your code freezes when camera gets on. It almost seems like its a natural byproduct of the "live" nature of notebook, essentially putting in a breakpoint after your last code block as if awaiting more instruction. But this is just a temporary workaround. We just need to use cv2.imwrite (). hope that helped. If we avoid cv2.waitForKey() and cv2.closeAllWindows(), and keep the windows open, the notebook will continue running. cv2.destroyAllWindows(), Just make sure your other instances of python are closed. When would I give a checkpoint to my D&D party that they can return to if they die? In the window, there's also no "close window" button like in the picture below. Concentration bounds for martingales with adaptive Gaussian steps, Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Python try to replicate the issue OUTSIDE of vscode. faceCascade = cv2.CascadeClassifier("haarcascade_frontalface_default.xml") Making statements based on opinion; back them up with references or personal experience. seems more like a 'bug'. privacy statement. At least I'm glad it's not just me. Video Capture on Mac Loops to Start instead of Returning NULL. I don't press any key to close the OpenCV window. These are the top rated real world C++ (Cpp) examples of cv::imshow from package poedit extracted from open source projects. , What caused this happen?CV_XADD parse issue in Xcode 4.2. you can use "import matplotlib.pyplot as plt" # Define the codec and create VideoWriter object.The output is stored in 'outpy.avi' file. image = I'm having the same problem with the code posted by propellerhat. OpenCV-Python is a library of Python bindings designed to solve computer vision problems. 1. from google.colab.patches import cv2_imshow. while cap.isOpened(): I have tried all the possible solutions nothing works. A most common code for close a window in OpenCV one can see on the internet, which a lot of people have a problem with: The problem with the above code is that the cv2.waitKey() will create a new . The cv2.imshow() only tends to freeze when I use Jupyter (ipynb) notebooks Mid 2012 Retina 8GB RAM def display_thumb(window_name,img,reduction=2, text=''): """ Displays a reduced sized image - but use Numpy strides to do the resize. To read the contents of an image, we have a function cv2.imread (). Save my name, email, and website in this browser for the next time I comment. One of the problems with cv2.imshow is that when you use it, the system will freeze. displaying cv2.imshow on specific window position cv show image python cv2 show image finding the format of an image in cv2 cv2.imread cannot find reference for picture import numpy import cv2 cv2.imshow ('image',img) cv2.waitKey (0) cv2_imshow colab show image with opencv2 cv2 opencv-python imshow while loop python cv2 canny overlay on image On Thu, May 6, 2021 at 10:28 PM Akella Niranjan ***@***. The following you can use to do your task: Hope it helps. if k==27: # Esc key to stop can you help me with the solution in mac. script in any IDE it is running perfectly fine. break In the window, there's also no "close window" button like in the picture below. The window popup of image shown through cv2.imshow() is closing very fast for me [duplicate], cv2.imshow() function is opening a window that always says not responding - python opencv. Macbook pro M1, How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? I upgraded to macOS Sierra approximately two weeks ago without . This function shows a window but it does not continue and you need to restart the kernel in Ipython. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? Required fields are marked *. Steps to Implement cv2.imshow () in python Step 1: Import all necessary libraries. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. i am newbie in OpenCV. On Pycharm, cv2.imshow() opens in a new window without freezing Pycharm console, Facing the same issue. import cv2 image = cv2.imread ('./captured_images/frame20.jpg') cv2.imshow ('First frame', image) cv2.waitKey () cv2.destroyAllWindows () add a comment 1 answer As @benedictchen mentioned, nothing worked for me if I run it on Jupyter Notebook (the window hangs when closing and you need to force quit Python to close the window). Find centralized, trusted content and collaborate around the technologies you use most. @kriti-banka There is no problem when running a script from terminal so I'm thinking it's an issue with interactivity. I have spent countless hours trying to fix problems with OpenCV, especially when running cv2.imshow like this: imshow has just the bad reputation of not working a lot of times. If we press a key from the keyboard while the image window is active, the window will close. Mathematica cannot find square roots of some matrices? Solution : The best solution for this problem is using matplotlib for displaying the image. I've been following along with an online tutorial and the first example has me downloading a zip file from a repo on github. Another wait is to story the most recent numpy array in a seperate variable. This appears to be a problem triggered by the first run. Parameter 1. The window displaying video pops up normally, but when I press 'q' to exit it freezes. whenever i use imshow() it open and freeze I had to re-start the kernel. The camera indicator lights up but no camera window popped up. Python Opencv2 imshow is closing immediately even with waitKey(0). but my task is hand detection and it should detect hand in a real-time video not separated frames. Reply to this email directly, view it on GitHub matplotlib.use('TkAgg') The window automatically fits the image size. jupyter notebook I thought it was happening because I was using WSL (Linux) but the same thing is happening for me in windows too. But for videos, we need to toil a bit harder. A friend with Ubuntu has the same problem. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. And also it works with OpenCV 3.1. I extracted the zip and then have tried to simply read and display the image through inputting various commands within my cmd line. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? I am using python 3.7 on windows 10 pro. - Christoph Rackwitz Sep 29, 2021 at 18:20 because it's been several years now. I am on macOS High Sierra 10.13.4, Python 3.6.5, OpenCV 3.4.1. One of the problems with cv2.imshow is that when you use it, the system will freeze. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? I tried to read an image from IDLE and tried to display it using cv2.imshow (), but the display window freezes and shows pythonw.exe is not responding when trying to close the window. My work as a freelance was used in a scientific paper, should I be included as an author? keypress occurs, so you should try having 32 in your waitkey function as a Install libgtk2.0-dev Package on Ubuntu, array.shape[1] , IndexError: tuple index out of range. Sample from issue's description is not applicable for video streams - it works well for static images, but as mentioned @sturkmen72 @sarveshkhandu waitKey() call should have non-zero parameter to avoid "freezing". First, we should specify the output file name with its format (eg: output.avi). I have the same issue in macOSX HighSierra. . code --disable-extensions --disable-gpu -w returns almost immediately. What worked for me is to uninstall the pip3 opencv package. import cv2. I couldn't understand why my code, which runs perfectly from shell or from PyCharm, is always freezing my Jupyter notebook. alalek on Jul 17, 2020. cv2.imshow opens multiple windows with "opencv-python" package from Pypi opencv/opencv#17827. I had many interviews with the best companies all around the world. We'll then review the types of edges in an image, including: Step edges Ramp edges Ridge edges Roof edges your video playback probably freezes because you have 0 in your waitkey @alalek why 'question invalid' label? Otherwise, the image is scaled to fit the window. However after the first run the picture shows up for a quarter of a sec and then disappears. Example #1. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. When I try to close it down (by clicking any key), it freezes. You can rate examples to help us improve the quality of examples. This is what I get: img = cv2.imread('lena.jpg', 0) print(img) None then I get this: I don't really know how to give more details. macOS 10.12.5 (Sierra) @AbhinavMathur yes, because for a slight second it does show up and I can see the image, but the screen is not persisting for some weird reason. the below code waits for user to press any key and then closes the image window: cv2.imshow( 'title' , img) python:3.6.9 If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage. Note: Array dimensions must match when using cv2.hconcat (). How can this still be a thing after 5 years, in such a famous project? Oh heck.. Yeah I've used imwrite before just didn't think I'd be using it this soon in the development cos I would usually use it to print the end results, but yeah you're right that's one way to do it! flags, frame = cap.read() Not the answer you're looking for? It happens sometimes in spyder ipython console and opencv. Hmm it does seem like using powershell for running the script fixes the issue.. 46 comments jagannath-sahoo commented on Sep 26, 2016 edited by mshabunin alalek added the incomplete label bug category: python bindings labels alalek added question (invalid tracker) and removed bug labels OpenCV Edge Detection ( cv2.Canny ) In the first part of this tutorial, we'll discuss what edge detection is and why we use it in our computer vision and image processing applications. macOS Sierra 10.12.2 Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Use different Python version with virtualenv. One is NumPy for black and white image creation. until any event occurs and anything above zero means waiting for that many Reply to this email directly, view it on GitHub eg: last_frame = np.array (current_frame) Then redisplay last_frame outside the while loop. So, if any other instance/window is open, python(or jupyter notebook will run into a priority error and crash. Using: Python3, CSI RPi camera, Jetson Nano Window_name: This parameter represents the name of window in which the image needs to be displayed. This function shows a window but it does not continue and you need to restart the kernel in Ipython. In Python Opencv Tutorial, I have explained how to read, show image in Hindi using the OpenCV python library. open a powershell or cmd terminal, or whatever's required to deal with WSL2. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. cv2.waitKey(0) hope that helped Nope, it is just incorrect usage of OpenCV. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Does a 120cc engine burn 120cc of fuel a minute? But where are if I run the complete code as a .py Mac: High Sierra, I have been working on opencv with OpenCV(4.5.4-dev) D:\a\opencv-python\opencv-python\opencv\modules\highgui\src\window.cpp:1274: error: (-2:Unspecified error) The function is not implemented. Feel free to report if you encounter any mistake. And the other is the OpenCV (cv2) module. Thanks, got it working with powershell, but if that feels too clunky for me as a bash user I'll certainly use your suggestion! The code in question is simply: The first run goes smoothly and lets me inspect the image until I press a button. the use of the waitkey call is to The above code is running perfectly fine!! You are receiving this because you were mentioned. Then, we should specify the FourCC code and the number of frames per second (FPS). I have not been working on any large projects or things that have been giving the application fits. instead of cv2.imshow() use "plt.imshow()" http://www.pyimagesearch.com/2016/11/28/macos-install-opencv-3-and-python-2-7/, https://docs.opencv.org/2.4/modules/highgui/doc/user_interface.html?highlight=waitkey, https://www.learnopencv.com/read-write-and-display-a-video-using-opencv-cpp-python/, https://github.com/notifications/unsubscribe-auth/AAJPSZ5Q2XTYJU4SQGVYMWLTMN26BANCNFSM4CQ2YBWA, https://github.com/notifications/unsubscribe-auth/AAJPSZ5YVO47FTWR72WNXDDUA46KNANCNFSM4CQ2YBWA, Visual Studio Code (VSCode) September 2019 release (1.39.2). Let's import them. I'm running: Thanks in advance for any help or comments. <. You signed in with another tab or window. maybe cv2.waitKey(0) waits for a key stroke. When I try to close it down (by clicking any key), it freezes. But where are if I run the complete code as a .py script in any IDE it is running perfectly fine. This means you cannot display color and greyscale images side by side using this method. Yeah this issue most definitely IS a bug. Well occasionally send you account related emails. Then you can have waitkey (0) that breaks until a key is pressed again. Need to validate this case and/or to check this sample with some generated input (try generating input via np.array with different colors) without external dependencies (PIL). Refresh the page, check. The text was updated successfully, but these errors were encountered: Can not reproduce with latest master version in Ubuntu 16.04 with GTK 3.18.9 highgui backend and ffmpeg video capture backend. Still, if we press a key from the keyboard before 5 seconds, the window will close. The default is: Connect and share knowledge within a single location that is structured and easy to search. Closing the window will keep it still running and eventually, on quitting python kernel will die. while(1): cudaToNumpy -> cv2.imshow not responding, no video output, no Error - csi camera sameelanka July 27, 2020, 4:49am #1 I'm trying to feed the cuda detection output to OpenCV and having no luck! 3 comments Closed . Until I add cv2.destroyAllWindows() in my code and it works. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? Maybe that is why it is freezing. hit key to exit then. QTKit didn't find any attached Video Input Devices! Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. :/. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? The function takes two arguments : The first argument is the path of the image. Python 3.9.13 Note, its not actually frozen because if you attempt to run again, or add more code below and continue execution, it will work fine and new calls to imshow will work, replacing the hung window. <, On Wed, Sep 8, 2021 at 3:55 AM ADI ***@***. Here is the code that I use. You may also try importing the matplotlib and using the matplotlib.use('TkAgg'), if you have all the libraries installed: instead of cv2.imshow() use "plt.imshow()" --. The cv2.imshow() only tends to freeze when I use Jupyter (ipynb) notebooks on my M1 MacBook Air. cv2.imread('./captured_images/frame20.jpg'), answered cv2.imshow('img', gray) Does integrating PDOS give total charge of a system. cv2.imshow('img',img) Just a sample code import cv2 as cv img = cv.imread ('book.jpg') cv.imshow ('img', img) cv.waitKey (0) As soon as the window opens, it closes, I am not able to even see the images properly. Find centralized, trusted content and collaborate around the technologies you use most. cv.MORPH_OPEN, None) # noqa closing = cv.morphologyEx(frameDiff, cv.MORPH_CLOSE, None) # noqa ret1, th1 = cv.threshold(frameDiff . elif k==-1: # normally -1 returned,so don't print it the cv2 docs say that 0 means it will wait infinitely until any keypress occurs, so you should try having 32 in your waitkey function as a value i have deduced that works well. import numpy as np I was using virtualenv so basically all I had to do was activate it and install Tesseract for windows and add: Thanks for the suggestion, I already tried that and it didn't help.. :(. 2019-11-05 11:38:41 -0500, Asked: I realized opencv was installed twice on my machine, one coming from apt-get and the other from pip3 (python package manager). k = cv2.waitKey(33) If the image resolution is more than a system screen resolution then it shows only those pixel which fits in the screen. Ex: Image resolution is (2000,1000) (widht, height) and screen . :), you can use "import matplotlib.pyplot as plt" By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If not, then the full path of the image should be given. Here is the code that I use. Sign in OpenCV 3.1.0, I tried inserting this line too but no difference: All the required libraries have been installed etc. Already on GitHub? cv2.imshow() is causing the system to hang and use up tons of CPU in the Python process. hi, I had some problem with cv2.imshow() too and with plt.imshow() the problem solved. To expect otherwise is the sign of a deranged contributor. For example, consider we want the image to close automatically after 5 seconds; it will close after 5 seconds if we don't press any key from the keyboard. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition, opencv cv2.imshow automatically add padding to small image, cv2.imread fails in script, not on command line, Python opencv cv2 cap.read() returns None in PyInstaller on Windows, How to perform multiple tasks in CMD through Python in the same terminal and without the window closing, cv2.imshow image window placement is outside of viewable screen, OpenCV(4.2.0) (-206:Bad flag (parameter or structure field)) Unrecognized or unsupported array type in function 'cvGetMat'. Why the image just disappears in the following code cvCvtColor DisplayImage asked Apr 22 '13 hayden 51 4 5 9 updated Apr 22 '13 berak 32993 7 81 312 I have copied the following code and compiled and tried to run with MSVC 2010. How come cv2.imshow() does not freeze on PyCharm, but freezes on VS Code? I help programming enthusiasts find their favorite work in big companies. Please consider if even 1 time you press any key to close the OpenCV window, then you have to restart your WSL. https://docs.opencv.org/2.4/modules/highgui/doc/user_interface.html?highlight=waitkey. I'm pretty new to using opencv as it stands, @skudev Well, if all fails, you can still view the images by doing. Contributed on Jun 20 2022. Otherwise freezes no matter. How to upgrade all Python packages with pip? Would like to stay longer than 90 days. When in MacOSX High Sierra, when running iPython notebook and opening image in cv2.imshow(), the screen freezes. It opens the camera, records the video, closes the window successfully upon pressing 'q', and saves the video in .avi format. In the United States, must state courts follow rulings by federal courts of appeals? Hi, I am currently using anaconda python 3.7 on macOS Mojave 10.14.6. I don't know the problem but a workaround worked for me. I was facing the same problem when I was using the default IDE (IDLE) but then I installed PyCharm, it works perfectly now, the image window closes instantly, also use waitkey(0). miliseconds. If you have many imshow command and you want to give the output image in separated figures, add the following code to the first of your code, Your email address will not be published. 2019-11-04 21:03:37 -0500, Problems installing opencv on mac with python, Gpu API call error (out of memory) in mallocPitch, Compiling cpp samples on Mac OS X: Unknown CMake command "ocv_check_dependencies". The dreaded cv2.imshow() freezing your system can only be fixed by preemptively adding cv2.waitKey(0). import numpy as np import cv2 Step 2: Examples on cv2.imshow () method Python: 3.6.3 You are receiving this because you were mentioned. opencv: 4.1.1 this should work. For example : To make window "alive", we should handle events from OS (usually in waitKey()). We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. rev2022.12.11.43106. ***> wrote: It's not only m1 notebooks. The image would still show greenish color in output for grescaled images. # We convert the resolutions from float to integer. take any key input while showing the frames. I hope this helps. import matplotlib continue The image should be in the same directory. 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