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give the output image in separated figures, add the following code to the first of your code, Your email address will not be published.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