Cv2 imshow freezes. I followed the instructions from the openCV documentation.

Cv2 imshow freezes Hence both the numpy arrays are equal- infact numpy. The destroyImage call fails to close a window (atleast under Linux, where the default backend was Gtk+ until 2. I couldn't find any universal fix, but main idea of all discussions is: of the currently given three answers, one just repeats to use cv2_imshow given by colab, which OP already knows, and the other two just embed video files in the HTML, which wasn't the question. Thanks so much. I am running Anaconda install of python35 with cv2 install from menpo. imshow('image',img) cv2. (picture is attached One of the most commonly used functions in OpenCV-Python is cv2. read() function gets stuck. VideoCapture(0) fourcc = cv2. 0 Python OpenCV cv2. x; multithreading; opencv; python; Share. Anyway, if I give the same mp4 video as Be careful if you are reading images using cv2 and displaying the image using plt. capture. Window freezing even after using waitKey() and destroyAllwindows() in Opencv. 0 GUI freezes the rest of python code. – Berriel. I'm having an issue where every now and again, randomly (but not always), cv::imshow() refuses to update the two It's been a very long time since I've used OpenCV, but I recall using waitKey(1) for displaying our frames in realtime. imshow funcion. jpg',1) cv2. sleep() or start time end time methods it either freezes my program and always executes the program and stops following the if System information (version) OpenCV => 4. imread('setup. destroyAllWindows() function, pressing any key on my keyboard is closing the image window. VideoCapture to read video and process it (apply a mask for background subtraction). answered Mar 15 Opencv imshow() freezes when updating. Ask Question Asked 7 years, 10 months ago. # this window will shut after 10 seconds, or earlier if you press esc or q def myApp(): # read the image img = cv2. 1. namedWindow("output", cv2. imshow() function is opening a window that always says not responding - python opencv. Everything works, but when i try to close it down it freezes and i have to use task manager to close it down. HTML(), this will provide standard playback performance. I did some research on the net and i found that the problem could be if “Imshow” method is not called from the main However, when I try to capture video from a 4k MP IP bullet camera from Hikvision, the video opens with the imshow command, but there is a significant lag and delay, almost more than 30 seconds. How can I close my Hello, I’m using C# to take a screenshot of my Laptop screen and placed it into the EMGU window via “Imshow” method(see code below). imshow('Aphrodite', img) # waiting using waitKey method key = cv2. browsed_img4) ImageToCrop = self. I tried using: I'm trying a simple code, in which I load a model, made a detection and I need to exhibit the segmentation mask with cv2. Do you see any . Im show issue It does open and update the frame, after 10 seconds give or take if I dont focus the window, also I get a Application not responding when focusing the window, eventually the window goes Again, your code runs perfectly on Windows. namedWindow(). imshow() like the following: #!/usr/bin/env python import sys, rospy, traceback, Python OpenCV namedWindow and imshow freeze. All groups and messages Something weird is going on with cv2. Encode the images in jpeg format using cv2. the question is: how to repeatedly show images, and have them be displayed successively, in the same place, in a colab notebook. cap. uint8)** cv2. Steps to reproduce def _debug_vis_callback(self, event): cv2. You could use VS Code Jupyter Interactive Windows to render your plots. waitKey(20) When doing so, the app correctly opens the windows and displays frames. Here's some prototype code: requirements. imshow without waitKey? – Apollys supports Monica. The corresponding window is always gray and Explore various solutions to the common issue of cv2. destroyAllWindows import cv2 as cv img = cv. However, how do you tell OpenCV to show the window on top of every other window? I run a full screen OpenGL application while showing im That's the default cv2. When I call cv2. I'm not sure which is more ridiculous: the nature of this bug, or the guy who thinks this is legitimately not a bug. Maybe then libqxcb. Stack Overflow. I've not yet come up with a good reason why this is happening, Hello. for image in image_list: cv2. waitkey(1) is not good in this situation, because the window will close after 1 millisecond. I have try to make an script in Ubuntu with two cameras, opening two captures with cv2. getWindowProperty('window-name', 0) >= 0: After searching online through multiple resources the suggestion for using threads to remove frames from the buffer came up ALOT. imshow("G",frameset) key = cv2. png') cv2. 3k 17 17 gold badges 63 63 silver badges 86 86 bronze badges. cvtColor(img, cv2. Follow edited Aug 2, 2023 I tried to make a face detection system using dlib and opencv and use my camera to test the program but the camera always freezes for some reason. Please advise. imshow() once per frame (that's where the actual drawing happens), also you only need 1 imshow() call per loop (and it has to show an image regardless if it finds any faces, too), like: Ok, sorry. Once I start to use the display functions in opencv, everything starts to freeze. main. imshow function By addressing the freezing issue and providing import cv2 # Load a color image in grayscale img = cv2. OpenCV => opencv_python-4. frame = video. The entire simulation will stuck on startup. Additionally, the video freezes a lot during playback. waitKey(0) it opens a windows10 window which is just grey and To achieve this, I'm using OpenCV's imshow function and a RepeatingTimer, which calls it's callback every N milliseconds. imshow('Original', img) #These two lines of delay are necessary to make this run or it crashes cv2. waitKey(1) cv2. imshow('threshold', key = cv2. ENVIRONMENT. tif", -1) plt. I'm also assuming that your entire program is running in a single giant loop, in order words, your In OpenCV when displaying an image with: cvSetWindowProperty("displayCVWindow", CV_WND_PROP_FULLSCREEN, CV_WINDOW_FULLSCREEN); There is a small border around the full screened window if anyone e The parameter is the same as used for cv2. Adding a value to waitkey() will make it pause for the given number of milliseconds. imshow). If we avoid cv2. It seems to be freezing immediately after calling VideoCapture(1) import numpy as np import cv2 print(1) cap = cv2. waitKey() delay time and they have all failed. jpg',0) cv2. 50. waitKey(0) As soon as the window opens, it closes, I am not able to even see the images properly. waitKey (1) & 0xFF if k == 27: break. imread("scren. destroyAllWindows() vs. Does anyone know how to fix this? Thanks. Otherwise the highgui just "hangs up". So either set it to 0, so the windows closes import cv2 import matplotlib. It looks like the camera is not actually getting cleaned up Basic imshow test freezes. The function waitKey waits for a key event infinitely (when delay <= 0 ) Hi, Please check if you can launch the pipeline: gst-launch-1. user1109729 user1109729. Thanks @Markus that git issue helped. cursor freezes over the output picture. imshow('frame',frame) if cv2. namedWindow(window_name), the image is properly shown in a OpenCV-Window, caused by the line cv2. 8. I know it can be done with Tkinter windows, but I wanted to see if there was a more direct way to do it with just the OpenCV library. imshow () freezes. imshow("Select Region of Interest", self. Window freezes or becomes unresponsive. waitKey(1) cause video window to freeze/not responding. This is a mild irritation - is there any way to get it to initially open in front / on top? A number of people have asked questions (here and here) about forcing persistent behaviour but this is, I think, simpler. imshow, it may be due to a import cv2 from IPython import display from PIL import Image def cv2_imshow(a): """A replacement for cv2. waitKey(1) cause video window to freeze/not responding Hot Network Questions Book series: starship officer returns to the academy where he trained with gardener in martial arts Describe the bug The bug is about calling the OpenCV window to render the camera image from the robot. imread('myimage. 1) k = cv2. – As per title cv2. 0 OpenCV stop rendering while mouse moving. imread(sys. I've written some code, which currently consists of two windows to show different stages of some processing algorithm. python, also install Qt5 and PIL. 1 Opencv imshow() freezes when updating. waitKey(1) # perform GUI housekeeping tasks Share. jpg',0) import cv2 img = cv2. stop() Honestly I dont really understand what you want to do. It opens only one window but seems as if its more than one because its capturing your own screen and displaying over that. Adding a waitKey(1) call right after destroyWindow may work. An argument of 0 indicates wait forever, so the image will be displayed forever unless you handle the keypress. I want them to be showed together, is it possible? This is the first time I am using matplotlib and only installed python3-tk. 14. read() cv2. jpg']): image = I'm trying to detect three types of fruit using a model and opencv for the webcam. that is the default. waitKey(500) Excerpt from the docs: Note For what it is worth, I have tried all sorts of tricks with setting the cv2. Python: cv2. 253:8554/test latency=200 ! rtph264depay ! nvv4l2decoder I am working with OpenCV to display an image, and I encountered a problem on Ubuntu. 26 applicatio Overview My setup is a docker container with Ubuntu 22. Make sure your GUI applications integrate cv2. VideoCapture('filename. After some search, The freezing problem is about reading video from rtsp and show it with cv2. It will cause system freeze so you will need to restart kernel everytime when you try to execute code. imshow(), but sudenly the program stop working and this erros is shown: qt. Hi all, I am quite new here. Here, you're reading the image in grayscale with 0 parameter in cv2. import cv2 img = cv2. array_equals() also returns True for the arrays being equal. imshow() freezing your system can only be fixed by preemptively adding cv2. Attempting to use the webcam for some object recognition. imread('oyster. I was writing a piece of code and wondering why one of my operations wasn't working (as diagnosed by observing cv2. imshow('Window', bgr_image. 6 Issue I try to show I'm having trouble using cv2 imshow when run in a separate python thread. When I step over to cv2. BGR2RGB)) # as opencv loads in BGR format by default, The dreaded cv2. Sorry it stemed from my own frustration with tkinter haha. The only problem is that it keep image as BGR instead of RGB so you have to convert it when you want to use with other modules - like Matplotlib, imageio, PIL/pillow or any GUI framework. waitKey(20 Hello, i have read RTSP stream of my ESP32Cam module for image processing and object detection project. Follow edited Oct 18, 2019 at 7:45. CV_CAP_PROP_POS_FRAMES, 1) #if frame count > than total frame number, next frame will be zero cv2. imread('book. resize(im, (960, 540)) # Resize image I have a problem with cv2. argv[1]) I have an OpenCV loop running with a video. imshow("Frame", frame) if cv2. imshow() in Context of GUI Apps. Because I need to display the feed in a cv2. cv. imShow() within c++ program. – ToughMind. destroyWindow() 0. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Can someone explain why the OpenCV imshow and imwrite function seem to result in a completely different image? The first picture corresponds to imshow and the second picture corresponds to imwrite. imshow. imshow('a', stack) if cv2. I was just looking for a way to detect when the window has been closed using the X button of the window in addition to waiting for a key press, but I couldn't find an answer anywhere (IsWindowVisible and cvGetWindowHandle are not available in the Python cv2 module). 6. But when I press 'q', as mentioned in code, it should stop and terminate the window. py System Information OpenCV version: 4. Now I have a window with a push button and an image (it is a label). I currently have found no (frame, cv2. imshow(“image”, image) Window is fullscreen, but the displayed image inside still occupied partially the window rather than using the full space of the window. imshow to freeze as commented here I removed PyAV and everything runs as it should. 0. GUI freezes the rest of python code. the user cannot resize the window, the size is constrainted by I have the following very basic code: import cv2 img = cv2. imshow ("zcx", frame) k = cv2. waitKey(0) cv2 Calling this method in any other thread will freeze the execution. waitKey(500) i = i + 1 try: annotation_list = annotation_list + [chr(c)] frame_number = frame_number + [i] except: continue So this is showing each frame for 0. 0 rtspsrc location=rtsp://192. read() freezes at the first frame. imshow function By addressing the freezing issue and providing non-blocking image display, this module enables smoother real-time image visualization in OpenCV applications and allows for I have tried running the while loop in a python thread using Thread(target=self. When I try to close it down (by clicking any key), it freezes. start(). There seems to have some sort of conflict between PyAV and OpenCVwhich leads to cv2. If OpenCV: cv::imshow() freezes. 66 Operating System / Platform => win10 Compiler => python Detailed description Function cv2. python; I am trying to save the video but it's not working. Looking at the corresponding description at the WindowFlags documentation page, we get:. imread()' the image window show not responding. h264-encoded in ISO mp4 container) can be displayed using an HTML <video> tag and IPython. namedWindow('img') img = cv2. Quite simply, I've created the two windows with cv::namedWindow(), and I'm displaying the cv::Mat with cv::imshow(). imshow without waitKey() From the documentation of cv2. 3. imshow() window icon: I'm finishing up a basic project, but want to make it look cleaner by changing the window icon that is displayed. show() It shows the content of the image: The reason why I want to stick with openCV is matplotlib import numpy as np import cv2 #Load an image into img variable img = cv2. The module supports displaying images in a multi-process environment, where multiple images can be shown simultaneously in separate windows without interfering with each other or When I leave out the line with cv2. VideoCapture(0) # Define the codec and create VideoWriter object fourcc = I see that you have the minimum code to video acquisition in python. So your Blue and Red color will get flipped. opencv-python imshow giving errors in mac. jpg') cv. Hence as soon as one window opens, your program captures the screen and displays a new frame on the stream and this process continues on which creates an effect of opening multiple windows. imshow() freezes. Another idea would be to display the images in a separate thread, and maybe even intentionally reduce the frame rate, skip every other image, for example. Is there some way to ask the user for input and then based on the user input, readjust the window in imshow()? Right now, imshow() refuses to show the actual window until I use cv2. The code works fine when I press the ESC key to exit the window, but if I manually click the "X" button to close the window, the program hangs and doesn't proceed to cv2. uint8)) cv2. only image will appear. This So I am working on a OpenCV project which would detect if a certain hand sign has taken place. Below is the relevant OpenCV Doc. core. At the entry script of your solution code base (e. There are a few peculiarities with the GUI in OpenCV. so file inside cv2 which is missing in the frozen location? Did you try my proposal with the whole folders cv2 or cv2/qt instead of cv2/qt/plugins? But as soon as the program window opens the video freezes. display. 0 Operating System / Platform: Windows 10 x64 Compiler & compiler version: MinGW GCC 7. imshow() inconsistently placing the image window outside of the viewable screen when running code similar to the one below both as a standalone script and line by line in the console (cmd, spyder, ipython). imshow(image, cmap="gray", vmin=0, vmax=4096) plt. The python scripts freeze on the cv2. imshow() works best when kept in the main thread, so this worked perfectly. 0 OpenCV python version: 4. import matplotlib. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Before it freezes it prints the following war Skip to main content. imshow('frame', frame) # Set the time between frames in miliseconds c = cv2. And although it seemed to work for a while it caused me issues with duplicate frames being displayed for some reason that I I am using low-level windows functions in conjunction with OpenCV to capture a window. imshow, which displays an image or video frame in a separate cv2. Hi, I am currently using anaconda python 3. Gives no errors when running identical code in a terminal. No matter what language I use: cpp/python/go, result always is the same. This module provides a solution for the freezing issue encountered when updating images using OpenCV's cv2. Python OpenCV namedWindow and imshow freeze. But when I call cv2. Python freezes after cv2. imshow(), the NOTE section mentions that the window is displayed for the amount of time indicated by the argument in cv2. pause(0. imshow('3 ',mask) k = cv2. It sometimes runs and sometimes hangs. imshow(cv2. release() cv2. tmp_4. destroyWindow() 71 cv2. waitKey(0) 3. imshow() properly with the application’s main loop, avoiding direct usage in environments that handle their own event loops, like IDLE. You may set the key waiting time to 0 second as waitKey(0). waitKey(0) cv2. waitKey(1) & 0xFF == ord("q"): break cv2. Code compiles and runs but the EMGU window is not showing the screeshot and gets frozen (see picture below). PNG', 1) #Display image cv2. read() #Assigning ret and So I triedd to use cv2 with cv2. When user press the 'q' key, the window should be closed and exit the while loop. 10 and av installed through pip as a dependency of aiortc. import cv2 camera = cv2. If the window freezes or becomes unresponsive when using cv2. png") cv2. VideoWriter_fo Show image like its shows in full screen but in small size. waitKey(1) & 0xFF == ord('q'): break # When everything done, release the capture cap. I followed the instructions from the openCV documentation. import numpy as np import cv2 import torchvision cv2. I created a class called Window_Capture that runs all of the functions necessary to capture the screen. cv2 reads images as BGR by default, where as plt uses RGB format. namedWindow(window_name, cv2. Related. jpg") # Read image imS = cv2. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online (self): #cv2. I just got new computer and that was never happening on the old one. In timer callbacks I do the following: for camera in I try to show image/stream video to window using openCV but this window freezes after exactly 4 updates. 29. VideoCapture. py), either start a debugging session in Interactive Window (> Jupyter: Debug Current File in Interactive Window) from the command palette, or, as I prefer, add #%% at the first line and click Debug Cell. destroyAllWindows() Even if I don't use cv2. 1,using spyder through anaconda. Matha. imShow() vs. imshow() for use in Jupyter notebooks. set(cv2. cvtColor(image, cv2. 5 seconds, and I'm learning to use pyqt5 and qt designer and I am so confused. 80 Python version: 3. closeAllWindows(), and keep the windows open, the Even it's the last of 10 windows created and destroyed in a loop the last one will always freeze as the program moves on. waitKey(0) and did not work either. waitKey(1) & 0xFF if k==ord('q'): break but when running the code nothing happens when I I am using openCV under Python 2. 9 I'm new to opencv and starting by reading in an image, and trying to display. Program execution freezes when using a different thread to imshow Image. imshow, nothing about writing a video file. You want to wait every 30s before you taking another picture? Your code seem to break while loop in both if condition and else condition Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The below code snippet displays same image one after the other cv2. destroyAllWindows() cv2. destroyWindow (from opencv) closes all windows and stops c++ program. | You already use the imshow function from matplotlib 🐛 Describe the bug Showing an image using OpenCV leads to the program getting stuck (100% CPU) without showing the image if torchvision is imported. This seems to have something to do with threading prevent that window being reused, because: cv2. isOpened()) like so: import numpy as np import cv2 cap = cv2. I have been trying to figure it out for more than a week, but got stuck. a proper solution requires IPython calls. waitKey() call after cv2. here's the code: import cv2 import dlib import Method 10: Use cv2. I am having a problem with openCV (version 4. I want to pause the video on the second frame and make the user click on two points. Hi whenever I use the cv2. Steps to reproduce ```. , saving the image). I am using a Mac as my local dekstop and a Raspberry Pi4 as the remote machine that I ssh into and which is generating the images for display on my Mac. 2 If OpenCV imshow() exist, the code works fine with additional QPixmap shown in the QLabel on top of the OpenCV cv2. imshow displaying a blank window or not functioning correctly in OpenCV with Python. imshow() on the original numpy array, it prints the image. So, is impossible improve runtime. Using cvShowImage, one can easily show an image in OpenCV. The image is displayed after closing the graph. Even so, closing is not guaranteed; the the waitKey function is only intercepted if a window has However, even for a simple code, the video works fine for about 30 seconds. imshow("frame", image) cv2. Copy link JavanTang commented Jun 10, 2022. That part works. JavanTang opened this issue Jun 10, 2022 · 1 comment Comments. 7 on Mac OS X (Lion)Whenever I run code to simply display a camera feed (from iSight) Python freezes. imshow("shown_img", img) Share. 8. imshow('img', image) cv2. imshow("debug", np. It works for the first file properly but freezes on first frame of the second file and stops there. Maybe the problem is due to video resolution, if W and H size is long, then buffer reading and showing video frames will be more delayed. 04 / Conda Detailed description When used cv2. Running the following turns off the webcam and closes the window but python freezes causing a manual force quit. I am having trouble with cv2. set, but it didn’t work well. txt opencv-contrib-python==4. i try lot of methods, but didn't get success. Issue submission checklist. 0. waitKey(). imshow('img', img) cv. My code: import numpy as np import cv2 import sys cv2. 5. waitkey(1) first. Although the code compiled successfully, running it consistently resulted in a memory allocation failure. Follow edited Mar 15, 2022 at 15:33. All with that, this is an issue specific to OpenCV and it installation. No matter what language I use: cpp/python/go, result always is the To achieve this, I'm using OpenCV's imshow function and a RepeatingTimer, which calls it's callback every N milliseconds. I found that the location of cv2. W Hi there, I try to view a subscribed image via cv2. In exasperation I ended up w I am trying to build a gesture based mouse using webcam and I'm still in the process of perfecting the idea but I'm faced with a problem that my webcam freezes immediately upon opening. and do processing. Can somebody help me with this? OpenCV in Anaconda imshow crash (Kubuntu) cv2. imshow(window_name, cv_img). python-3. imshow('img', result) cv2. video_capture = cv2 I am using Python to run this in Windows computer. from backend we select the image size and we have to show this image without any title bar and border. If I put 1 millisecond in the waitKey In Ubuntu, OpenCV's imshow function has a window where different options such as zoom in, zoom out, pan window, etc, are available, like this: import cv2 import matplotlib. imshow("Original",image) #after few lines plt. imshow(camera. imshow() not working in windows. imshow() doesn't work in threads but I'm not sure how to get around this? I tried to run the below program, and I can successfully close the window by pushing any button, but when I close the windows by hitting "x" on windows, my terminal will freeze. 6. imshow doesn't really make sense in a client/server environment like Jupyter. cv. waitForKey() and cv2. My goal is show a picture when I click a push button because in a future I want to combine all of this with opencv. If escape is pressed it exits. 21. If you set waitKey(5000) for 5 seconds, it will show the image for 5 seconds and destroy it. The <video> can be a link, or have embedded base64'ed data (the latter is what matplotlib. 3. imwrite('img. I have a python script utilizing cv2 to display a portion of a given picture/stream. When I move the object that it's supposed to be detecting off the camera, the windows showing the frame (and I'm assuming the code aswell) unfreezes until I bring the object back into the camera's view (it immediately freezes again if it recognizes the object). waitKey(500) periodically as it is the only way for the Highgui component of OpenCv to process events (and update the display). Steps: According to the OpenCV Documentation:. imread('pic. My problem is that cap. imshow() crashes Kernel. OpenCV imshow doesn't prompt window showing the image. Modified 7 I am working with OpenCV to display an image, and I encountered a problem on Ubuntu. waitKey(0) it opens a windows10 window which is just grey and freezes. Steps to reproduce `import cv2 import math import utils import face_detection. The kernel indicator (Python 3 (ipykernel)) circle is solid and stays that way. imread, so you won't see this issue. waitKey(0) The first run goes smoothly and lets me inspect the image until I press a button. I need to play video files using cv2 with threading. pyplot as plt # load image using cv2. OSx Mojave 10. imshow() it gives a shows the image for a second, then makes the window go gray. waitkey(0) and cv2. 1. I am not sure if this is the "right" way to do this, so all suggestions are welcome. You can now interactively render your plots during a image = cv2. **result = result. Function cv2. show() cv2. You can try alternatives such as Qt and glfw. Here is my Jupyter code: import cv2 import numpy as np # designate screen dimensions for UNIHIKER display height = 320 cv2. Utilize the & 0xFF technique with cv2. . while True: frame = vs. is there any way to do this ? if any body knows, please help, i stuck in this from many days In your question you mentioned keeping the window open, that is why I suggested cv2. imread(path2image) # is an array # showing the image cv2. My code acquires 10s video using Picamera2 video recording function. When I use 'cv2. python & imshow with pyplot. waitKey(0). imshow("Win",img) cv2. h264') (grabbed,frame) = camera. 04 and python 3. imshow function all I get is a black rectangle like this: My code is here, I am using python: from cv2 import cv2 image = cv2. Commented Mar 23, 2018 at I'm converting a image (numpy array) into a string. Removing cv2. imread("test. destroyAllWindows() I’m trying to feed the cuda detection output to OpenCV and having no luck! Using: Python3, CSI RPi camera, Jetson Nano Detection works fine, and I can save the Numpy image to disk, but cannot get it to render or display via I am semantically segmenting images within a video sequence and displaying the result within a display window in real-time. imshow(img) is crashing the server. My issue lies within the member function: get_screenshot(). g. Thanks for the comments, I tried cv2. OS- mint Linux, using opencv3. imshow() in loop, the window doesn't reload and gets stuck at the first frame. 1 Operating System / Platform => Ubuntu 18. xlim([0, 256]) plt. Also, cv2. imshow(img) the resulting window opens behind my terminal window. from the command prompt: cd to the project directory, then: import cv2 # Load a color image in grayscale img = cv2. OpenCV Version :- 4. Inserted the cv2. I tried several methods of improving the performance of OpenCV's imshow() over an ssh connection. Commented Aug 19, 2019 at 6:50. imencode and passing it to tag in browser. 11 Camera : ESP32Cam Module running Tasmota My specific problem is that my video freezes on the last frame, and I would like to know if the line vidFile. VideoCapture(1) #This is opening the camera stream and assigning it to cap while (True): print(2) ret, frame = cap. 1 @Apollys Unfortunately, not that I'm aware of. (img, cv2. Whenever I capture the screen, OpenCV’s Hi! I am using a HQ camera and a raspberry pi4. This script will pause 5 seconds and then display the next image. It seems problem is related to macOS version of OpenCV and googling shows you're not only one. destroyAllWindows() else: cv2 When executing an OpenCV python script containing: cv2. But when I use time. imread("earth. I do not understand, but I did got the frame window opened. imshow("Robot Depth Frame", cv2. imshow() window. You could use itertools. cv2. If the window was not created before this function, it is assumed creating a window with cv::WINDOW_AUTOSIZE. imshow('area',frame2) cv2. set_data(frame1) plt. cycle() to cycle through a list of images. Right now I have modified my code to while True: frame1 = grab_frame(cap1) im1. However, if i take out the OpenCV imshow(), the UI will freeze and nothing showed leading "python not responding". answered Oct 18, 2019 at 6:33. However, the opencv window is just blank and doesn't show the frames. Disabling compression on the ssh connection. Load 7 more Setting delay = 1 is not the same as not having a wait, is there any way to use cv2. imshow('image', image) cv2. Ros image message rate is low. I tried to reduce the resolution using video. VideoCapture() and calling them from two different threads, but the script just freezes without raising any er cv::imshow is a convenience function more suited to prototyping and simple applications. The code below works for the first call of start_cam, but the second call fails - the cv2 camera window does not reappear. release() cv2 How can I track a yellow object in python using opencv? And, if possible, how can I get the position of the object? I've tried using the following method but i can't figure out how to lower and upper ranges work. I restart the pc and tried with one pic open still shows the same problem. imread('sample. png I try to show image/stream video to window using openCV but this window freezes after exactly 4 updates. import time import cv2 points=[] layer = 0 def onMouse(event, x, y, My object detection opencv code runs well for around half a minute, then freezes. import cv2 cv2. grab(), but I am trying to make my capture faster. pyplot as plt image = It freezes a little moment periodically. imshow inside a seperate process? [closed] Install openCV on Mac OS Sierra. If you import DeepSort, the program will get stuck in cv2. waitKey(0), at which point I can't ask for user input until the window is destroyed. I can't seem to find anything about it, except that I should use cv2. waitKey(1) inside of your while(cap. The code works fine when I press the ESC key to exit the window, but if I manually click the "X" button to close the window, the program hangs and doesn't proceed to the next steps (e. imshow freezes using deep_sort #247. Since the OS has a minimum time between switching threads, the function will not wait exactly delay ms, it will wait at least delay ms, depending on what else is running on your computer at that time. COLOR_GRAY2BGR) cv2. Your code waitKey(100) instructs OpenCV to wait for 100 milliseconds then destroy the window. I'm in a jupyter notebook using anaconda. destroyWindow('Test') after the waitkey. Controlling the duration for which the window needs to displayed is a useful aspect while Although I was expecting an automatic solution (fitting to the screen automatically), resizing solves the problem as well. waitKey(1) if key == 27: break self. wscourge. zeros((128,128,3 I'm trying to simply open up a USB Camera but cannot for the life of me figure out what in the world is going on. read () cv2. 11. 7 on macOS Mojave 10. imshow() starts without poping up a window when called in threading. 2) I am trying to run a video with an “object detection”. imshow('viewer',frame) This basic code will load up a window under the anaconda ?window? and freeze forcing a reboot of the ipython kernel. 168. WINDOW_NORMAL) # Create window with freedom of dimensions im = cv2. camera_id, frame) cv2. astype(np. It works great when controlling the the displayed portion via keyboard presses: import cv2 import numpy as np i You can use cv2 to read it - imread() - display it and see coordinates and color - imshow()` - or display and seletec region - selectROI() - which you want to get as array. Is it the problem of the driver v4l or something (area > 800000) and flag==1): print 'found' flag=0 print area cv2. The same thing works fine on my friends computer. You want something that will display the image as part of the notebook (on the client side), not to run a GUI window on the server side -- that might kinda "work" when the client and server are on the same machine, but that's about it. The function waitKey waits for a key event infinitely (when delay <= 0 ) or for delay milliseconds, when it is positive. read() # Show one frame. imshow() on the new numpy cv2. Goram 2024-08-23 08:35:26 619 Views 0 Replies. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Overview My setup is a docker container with Ubuntu 22. waitKey(0), which I am, and also to use cv2. Result is an array of floating point values between 0 and 255. imshow("Red UNIHIKER screen", red_image) cv2. I've read that cv2. waitKey(1) == 13: break Reply reply a rock paper scissors project and have a button for when to begin the countdown but when it starts the camera instantly freezes! Reply reply QUAke_97 When I try to use cv2. 0) unless waitKey was called to pump the events. I am using opencv on python and I'm facing an issue where the cv2. Method 11: Gradual Waiting with Key Handling. get_frame() cv2. Hello, I’ve been using OpenCV for a while, but I tried creating a new project with windows 11 and I seem to be having some issues with methods imshow and trackbar. I need help. In timer callbacks I do the following: for camera in list_cameras: frame = camera. COLOR_BGR2GRAY) # Display the resulting frame cv2. animation does, for example), and its data can of ret, frame = cap. Python OpenCV cv2. imshow (), the running can never stop. I thought it was happening because I was using WSL (Linux) but the same thing is happening for me in windows too. Commented Mar 23, 2018 at 4:51. Using image callback and videocallback OpenCV Kinetic. I did do the crosspost, sry for not mentioning. show is displayed. jpg', 'image2. set_data(frame1) im2. waitKey(0) The image is not displayed but only the plt. 11 Python freezes after cv2. waitKey(10000) # wait 10 seconds if key == 27 or key == 113: cv2. ISSUE. I attempted to publish and display an image from a video using cv2 and ros2. copy() r = cv2 Since you have not provided any code, my assumption is this: When cv2. I did installed VSCode and tried in there. imshow("image2", image) I have tried using different file types as well as restarting my computer. destroyAllWindows() I have tried using the stop run button in Spyder and also interrupting Kernel in Jupyter notebook. I report the issue, it's not When I use cx_Frezze to create an exe for the below OpenCV code it works as expected: import cv2 import numpy as np # mouse callback function def draw_circle(event,x,y,flags,param): if event . If The actual "problem" comes from imshow itself, and is the following:. Improve this answer. WND_PROP_FULLSCREEN) and I run my code which is locking up my kernel. However, my code is "dropping frames" by not updating the display window with each call to imshow. imshow("window", img) cv2. imshow('2',simg) cv2. I could use ImageGrab. waitKey() to handle the keyboard Hi Georgy, I was playing around trying to understand why it freezes and I found something. imshow("window", img2) The window is opened properly, with the correct size, but it's gray - there's no image. destroyallwindows() but If you have used python notebooks then there is a problem in Unix based system to run a program of opencv. Here is the code that I use. I had the same problem. qpa. I have an alternative method which would prevent from freezing your system. plot(hist) plt. pyplot as plt image = cv2. The frame to be shown is grabbed by webcam and in debug mode really read. WindowStaysOnTopHint. imshow() infinite loop that is uninterrupted, I have The video encoded data (if in a format the browser can decode, eg. import numpy as np import cv2 cap = cv2. Then it freezes and computer hangs. Then I'm converting this string back to a numpy array of the original dimensions. plugin: Could not find the Qt platform plugin "wayland" In the venv I got installed opnecv. Stack Exchange Network. I appreciate if someone can help. VideoCapture() method. Let's say every 1 seconds it freezes 100ms. png', 0) # Reads a Gray-scale image img2 = cv2. get_frame, args=()). Any pointers would be appreciated. Single millisecond delays shouldn't make a significant difference for most processing - even if you're processing at 100FPS, you probably only want to imshow every few frames anyways. This brings up the opencv window and doesn't block the pyqt5 GUI. videoCapture is attempting to retrieve a frame but the network cuts off, it freezes for X amount of seconds and stalls your program until it either timeouts or a frame is finally retrieved. plt. If you want the window to close automatically, you have to add cv2. 78 Python Verson :- 3. Than, I load the mp4 video just recorded and I use cv2. so depends on another shared library which is not included by cx_Freeze (or an incompatible version of this dependency may also be included from another package). 5. So I played around and this is how it works: while cv2. waitKey(1) after reading a few forums. 9. imshow, waitkey will better as it doesn't help in displaying in browser it will keep your server from starting and after you press 'q' the program will stop so it won't have any output to display. imshow line after av is imported. COLOR_GRA Skip to main content. The problem is that when the file is being saved and uploaded, the Open CV output window freezes until the above processes finish. There is no opencv window either. The code mentioned below opens a window of name frame and display the video captured through laptop camera. there needs to be a cv2. from itertools import cycle import cv2 for image_filename in cycle(['image1. Whenever i want to work with some video, it just freezes my whole computer and only thing I can do is to turn off computer manually with button. I am writing a program that displays a webcam feed live on the computer screen while also taking an image from that feed every 30 seconds or so to do some operation on that image (mainly slicing it up using numpy and opencv and reading numbers with Tesseract). imread('Image71. it is Add cv2. What I have found to work is to try something like:key = cv2. It is running, but then after about one second, the video is not responding. I also wanted to make it so that it waits for a few seconds so it does not count accidental movements. ktezw phwazi ogzj xxxiuas booaejv eegen odsi qacswdz hsuz xkayb