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To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to combine uparrow and sim in Plain TeX? Thanks a lot! cv2.waitKey(1) It runs 2 times in my function: Length and front2nape. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); This site uses Akismet to reduce spam. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Lets start with a basic example of using cv2.waitKey to display an image and wait for a keypress: In this example, well use cv2.waitKey to control the display of an image with keyboard input. NumPy Image Creation Using NumPy, create an image of at least 100 x 100 pixels! It means that your program will wait indefinitely for you to press a key before executing the next line of code. opencv GUI does not work Issue #46 opencv/opencv-python Am I missing something? to your account. For a better experience, please enable JavaScript in your browser before proceeding. Or better yet, just the ln command to symlink the built .so instead of copying, so that if you decide to compile OpenCV3 with different compilation flags you don't have to copy the library file over again.. How to cut team building from retrospective meetings? SyntaxError: 'break' outside loop. Have you used Trackbar in your code? But now, I don't know why 255 == 113? the camera fps will be the bottleneck. [Solved] I can not get CV2.waitKey in OpenCV to work - solveForum /feedstock_root/build_artefacts/opencv_1489510052062/work/opencv-3.1.0/modules/highgui/src/window.cpp:616: therefore if the user is pressing the q key when cv2.waitKey(1) is evaluated the following will be determined: I just finished some OpenCV code and cv2.waitKey(1) & 0xff == ord('q') was one of the pieces that I toyed with multiple times. the window will close and print the key that was pressed. waitKey(0) means forever. Famous professor refuses to cite my paper that was published before him in the same area. "I've installed the libgtk2.0-dev package but it doesn't got resolved." thing is, if I execute namedWindow, then imshow with even different window name also works well, and they terminates when namedWindow's gray window terminates. Why do people say a dog is 'harmless' but not 'harmful'? Is the document wrong and using namedWindow necessary? it is like cv2.destroyAllWindows() gets hung up, I can not get CV2.waitKey in OpenCV to work properly. The waitkey() is a keyword-binding function and it only accepts time in milliseconds as an argument. error: Not the answer you're looking for? I have not tested it in python but hope it will have resolved this too. First, use a single waitKey call to get the key required as so- inp = waitKey (1) JavaScript is disabled. This works for me. Why do people generally discard the upper portion of leeks? Best regression model for points that follow a sigmoidal pattern. cv2.waitKey (0) will wait until you press a key. You can also use the ord function if you don't know the actual integer values for keys. Level of grammatical correctness of native German speakers. Copy link . How do you determine purchase date when there are multiple stock buys? As I know so far, the output of cv2.waitKey(number) for all every int number is -1, and 0xff is a hexadecimal number that is equals to 255 in decimal numbers. We will look at its application and work later in this article. All I wanted was to get rid of that gray window any words of wisdom is appreciated, thanks. The cv2.waitKey function is an essential part of the OpenCV library, responsible for handling keyboard events in conjunction with the display of images and videos. plus, I got these responses from stackoverflow: Comments Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Having trouble proving a result from Taylor's Classical Mechanics, Walking around a cube to return to starting point. After loading an image, and then show the image, cv2.waitKey() can not work properly when I use opencv in python idle or jupyter console. Needs patching in. For example, if I use cv2.waitKey(3000) after using cv2.imshow('test', img), the image window should close automatically after 3 seconds, but it won't! Trouble selecting q-q plot settings with statsmodels. Connect and share knowledge within a single location that is structured and easy to search. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. @cstarknyc I'm not sure how your autosize used to work before, but I believe it has always resized the window to match the size of the image/matrix passed to it. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Call it once in the loop, store the result in a variable, and use that variable in your multiple, Storing to code to execute in strings kinda smells to me. Find centralized, trusted content and collaborate around the technologies you use most. If o is passed, it waits indefinitely until a key is pressed. How can my weapons kill enemy soldiers but leave civilians/noncombatants unharmed? No other effects but the messages are very annoying. The function is primarily used to pause the execution of the program for a specified duration, allowing the user to view the displayed content or interact with it via the keyboard. But first, let us try to get an overview of the function through its definition. I can reproduce this on Windows 10 with Python 3.6.6 and OpenCV version 3.4.2, by trying to use cv2.imshow and cv2.waitKey like I used to be able to. I'm not sure of the advantage, because they gave me problems in my environment. When I close the window the console in spyder get stuck, it looks like is still running or waiting. 13 comments Contributor thewoz commented on Oct 21, 2017 edited OpenCV => 3.3.0 Operating System / Platform => macOS 10.12.6 (Sierra) Compiler => Xcode 9.0.1 QT => 5.9.2 #20215 By clicking Sign up for GitHub, you agree to our terms of service and Do Federal courts have the authority to dismiss charges brought in a Georgia Court? Same problem, attacked in multiple ways, all failed. 601), Moderation strike: Results of negotiations, Our Design Vision for Stack Overflow and the Stack Exchange network, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Call for volunteer reviewers for an updated search experience: OverflowAI Search, Discussions experiment launching on NLP Collective. The function waitKey waits for a key event infinitely and the delay is in milliseconds. due to im not that good with linux how do i check if may cam is working properly. Connect and share knowledge within a single location that is structured and easy to search. How to use cv2.waitKey(1) in Python OpenCV, cv2.waitKey() works for 'q' key but does not works for any other keys. What determines the edge/boundary of a star system? I can confirm all my previously working C++ code now only shows window title bars without contents. cv2.__version__ = 3.3.0 on Nov 19, 2017 Asking for help, clarification, or responding to other answers. Interestingly, the name of the 2nd window (as defined in imshow("this name")) does not matter, i.e. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. cv2.waitKey(1) returns the character code of the currently pressed key and -1 if no key is pressed. How this line works? Thanks for the help. The more you know :) Also, don't you think that if the amount of if else statements was large, it would be rather quicker to use the dictionary method instead, assuming memory isn't a concern? It seams like the waitKey() in not working properly. cv2.imshow("Frame", frame) Is DAC used as stand-alone IC in a circuit? NOTE: Use ; for multiline code (as shown in dictionary line 1), or break it into single line function calls. The pic shows up in a new windows as expected. # if the q key was pressed, break from the loop The above PR fixes the issue for me. 99 is c, what's the point?? cv::waitKey not reading keyboard input properly - OpenCV Q&A Forum You must log in or register to reply here. cv2.imshow('image', img), while True: maybe I should downgrade opencv and test it edit:nevermind, I downgraded to 3.0 and it works find. Using Raspbian and Wheezy, I now have Jessie if that's relevant. I will have to try your suggestion for videos. Do Federal courts have the authority to dismiss charges brought in a Georgia Court? @kevin-coder , I have tried to add the cv2.destroyAllWindows() and press F5 to execute the script, but nothing changes.Still I can not close the image window unless I exit the IDLE or Jupyter qtconsole or what so ever. No such problem in Windows 11. cv2.waitKey(0) Do Federal courts have the authority to dismiss charges brought in a Georgia Court? error: (-2) The function is not implemented. 600), Medical research made understandable with AI (ep. So you need to ensure that you're calling 'break' if there are loops involved in your code, like so: Say there are no loops in your program, then you replace 'break' statement with a 'return' statement. A window flashes black on the screen and disappears immediately. I am actually wondering what the advantage of. privacy statement. : which is: creating 2 windows, the 'namedWindow' being gray. Web cam not working - Python - OpenCV Am I missing something? cv2.destroyAllWindows() I used git checkout acb626 -- modules/highgui/src/window_cocoa.mm. Continue with Recommended Cookies.