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