Questions tagged [opencv]

OpenCV (Open Source Computer Vision Library)

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How to install OpenCV 3.1 for Python 3.5 On Ubuntu 16.04 LTS?

How to install OpenCV version 3.1 on Ubuntu 16.04 LTS to work with Python 3.5.1? I tried this on a VM but obviously that is useful to do if you want to work with Python 2.
Billal Begueradj's user avatar
24 votes
3 answers
65k views

How to install opencv 2.9 for python?

I have been having the exact same problem as described in this post and someone in the answers suggested that you upgrade to opencv version 2.9. I was wondering how do that? I installed the version ...
evan54's user avatar
  • 735
20 votes
3 answers
87k views

ImportError: libgthread-2.0.so.0: cannot open shared object file: No such file or directory

How should I solve this error in Ubuntu16.04? import cv2 File "/opt/conda/envs/pytorch-py3.6/lib/python3.6/site-packages/cv2/__init__.py", line 3, in <module> from .cv2 import * ...
Mona Jalal's user avatar
  • 4,545
20 votes
1 answer
69k views

Installing libgtk-x11-2.0.so.0 in Ubuntu 15.04

I'm trying to install opencv on my Ubuntu 15.04 server. I'm using the conda package manager. conda install -c https://conda.binstar.org/menpo opencv3 When I try importing cv2, the Python package, I ...
Carpetfizz's user avatar
18 votes
5 answers
143k views

How to uninstall OpenCV 2.4.9 completely from Ubuntu?

I want to integrate OpenCV with qt creator and for that OpenCV 3.0 is required. I have OpenCV 2.4.9 already installed and want to uninstall it completely as it is causing problems in some functions. ...
Naman Sogani's user avatar
17 votes
5 answers
160k views

"/usr/bin/ld: cannot find -lcudart"

I am newbie to Ubuntu and using Ubuntu 14.04 64-bit. I want to make a project that uses cuda and opencv I got the following error when running cmake . && make Linking CXX executable ...
Arash's user avatar
  • 283
17 votes
1 answer
64k views

Why can't my program find the libraries in "/usr/local/lib"? [duplicate]

I'm on Ubuntu 10.10, and I've just upgraded opencv to 2.4.2. The problem is that each time I open a new shell and try to compile and run, it compiles but doesn't run due to the following error: ./a....
nkint's user avatar
  • 2,025
16 votes
5 answers
55k views

Installing opencv

I've downloaded opencv but unfortunately I've got no idea how to install it. All the pages I found online were only telling me how to download and install it directly from the console, not what to do ...
user185184's user avatar
15 votes
2 answers
19k views

How to undo apt-get autoremove

I just walked into the trap of calling sudo apt-get install autoremove I did it because I was unable to install sudo apt-get install libopencv-dev because of unmet dependencies. Now my ros-indigo ...
mcExchange's user avatar
  • 3,088
9 votes
2 answers
28k views

Unable to locate package libgstreamer0.10-dev on Ubuntu 18.04

I'm trying to install OpenCV4 as explained here When I get to sudo apt -y install libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev I receive Reading package lists... Done Building dependency ...
Matheus Leão's user avatar
9 votes
2 answers
10k views

Is it possible to only download a single frame from a youtube video?

Let me explain what I had set up. I've been using pytube (Python module) to download videos from YouTube. I would then extract a few random frames from the video and save them as jpegs. I don't need ...
binarychrom's user avatar
7 votes
3 answers
36k views

Missing write permissions in home/user/anaconda2

I am trying to install opencv using the command conda install opencv This command worked on my laptop, but i am getting following error when I try it on my desktop computer. Both systems are running ...
Mobeen's user avatar
  • 359
6 votes
7 answers
29k views

Unable to insall libgtk2.0-dev on ubuntu 12.04

I am using opencv 3 on ubunut 12.04 and while displaying an image the error message asks me to build the library with libgtk2.0-dev. I tried sudo apt-get install libgtk2.0-dev but I get the following ...
rotating_image's user avatar
6 votes
1 answer
8k views

Install OpenCV 3 on Ubuntu 17.10

I'm using Ubuntu 17.10 and I want to install OpenCV 3 on it. How can I install OpenCV for Python 3 on Ubuntu 17.10?
Ali Razmdideh's user avatar
6 votes
3 answers
105k views

Where is OpenCV installed?

I have followed this guide to install OpenCV 2.4.8 OpenCV documentation says that I should find OpencV usr/local/include/opencv/ yet I find nothing. Can someone tell me where to find the installed ...
Raed's user avatar
  • 173
6 votes
1 answer
14k views

image viewer in ubuntu that can show the pixel coordinates and pixel value as well for current mouse location in the image

I am looking for any image viewer in ubuntu which can show the pixel coordinates and pixel value under current location of mouse other than gimp..... thanks for your help
Bhupendra's user avatar
5 votes
1 answer
24k views

Building Caffe: Failed to see hdf5.h

Hello Caffe is a library for deeplearning. When trying to build that library under Ubuntu 15.04, the compilation fails with the message: :~/App/caffe$ make all PROTOC src/caffe/proto/caffe.proto CXX ...
Jean-Pat's user avatar
  • 151
5 votes
4 answers
10k views

how do I install opencv4.0 on 18.10?

I have been trying to install opencv4.0.1 on ubuntu for a few weeks now. I have followed the opencv installation instructions and I am able to make and compile the library, yet after installation, ...
j0h's user avatar
  • 14.8k
5 votes
2 answers
11k views

Linking error when trying to compile on a shared drive

I am trying to compile the OpenCV library on a shared drive on my system. I was able to configure and generate makefiles successfully by using these settings, but when I try to compile I get the ...
bubble's user avatar
  • 389
5 votes
1 answer
4k views

How to install python-opencv without answering the quesitons?

I'm trying to create a docker image (using a Dockerfile) and as part of the process, I have to install apt-get install python-opencv. But it asks all these questions about geographic area and other ...
Mehran's user avatar
  • 1,787
5 votes
2 answers
3k views

How to Install Shotwell with Face Detection in Bionic Beaver 18.04 LTS

I'm transitioning from Google Photos and I really liked Shotwell's features. However, face detection/recognition is very important to me because of how I manage my photos. I viewed this blog post that ...
Riyaad Azad's user avatar
5 votes
1 answer
290 views

Is there an equivalent of virtual env but for the whole of ubuntu?

Python has a wonderful tool called a virtual environment, which lets you effectively hermetically seal various python libraries (which may conflict with each other!) from each other. Is there an ...
eriophora's user avatar
  • 151
5 votes
1 answer
4k views

How do I get OpenCV and Firefly MV working?

I'm trying to get started with the Point Grey Firefly-MV USB camera in Ubuntu. I have followed the instructions from Point Grey, and got completely black images (Yes, the lens cap is off). Does ...
Bradley Powers's user avatar
5 votes
2 answers
5k views

How can I use OpenCV 3.0 without overwriting my current version of OpenCV (2.4.8) on Ubuntu?

I'm working with ROS indigo on Ubuntu 14.04 LTS, which automatically installs OpenCV 2.4.8 on my Linux machine. I'm very new to how Ubuntu works, so I really don't want to mess with the OpenCV that's ...
user2555636's user avatar
5 votes
1 answer
4k views

Running caffe gives error Check failed: error == cudaSuccess (30 vs. 0) unknown error

I'm trying to get caffe to run such that I can use it via python. To do this I have followed this tutorial. I'm on Ubuntu 16.04. When I get to make runtest I get the error : $ make runtest CXX/LD -...
Thijser's user avatar
  • 1,051
4 votes
3 answers
3k views

OpenCV compiles correctly but fails during .deb packaging

Attempting to follow some tutorials on building a .deb package for a newer version of OpenCV in Ubuntu 18.04. Here are my steps: wget https://github.com/opencv/opencv/archive/4.1.0.zip unzip 4.1.0....
Stéphane's user avatar
  • 2,526
4 votes
1 answer
290 views

What is the path of libraries (samples, docs) setted up from Software Center of Ubuntu 12.04?

I installed OpenCV and its DOC and Samples from software center but I cannot find the them at anywhere. What is the certain location for all these at Ubuntu12.04
erogol's user avatar
  • 344
4 votes
1 answer
8k views

OpenCV install problems on Studio 12.04 - broken dependencies [duplicate]

Problem: I'm trying to install OpenCV (video analytics) and am following the Ubuntu OpenCV installation documentation. The provided script has a line which executed for some time, taking away more ...
4 votes
3 answers
16k views

libv4l2: error turning on stream: Invalid argument VIDIOC_STREAMON: Invalid argument

I'm working on camera using opencv 3.0.0 and C++ with Ubuntu 14.04 , When I run a program using the camera and stop it with Ctrl + C, I can't get it run for a second time and it gives me the ...
The Beast's user avatar
  • 383
4 votes
1 answer
993 views

opencv java 'No such file or directory' after upgrade from 14.04 to 16.04

I recently upgraded from 14.04 to 16.04 LTS. I have been working on a java application on this machine for months, which does image processing using opencv. I compiled opencv from source. I do my ...
excyberlabber's user avatar
4 votes
2 answers
17k views

make opencv2/opencv.hpp not found

I am trying to build fastfusion from this repo: https://github.com/tum-vision/fastfusion . In the installation step, after running CMake ., I have to run make. But the make command fails with the ...
Redwanul Sourav's user avatar
4 votes
0 answers
2k views

Simple OpenCV program crashes

I am currently having a problem. I am following the instructions given in this book "OpenCV 2 Computer Vison Application Programming Cookbook" for creating a simple image display program in OpenCV (2....
wp11's user avatar
  • 126
3 votes
4 answers
18k views

CMake OpenCV installation issue

This is driving me nuts for the past three hours. I simply want to install CMake and then install OpenCV 3.1, but I am getting an Unsupported protocol error (please see below). I installed CMake 3.4....
apples-oranges's user avatar
3 votes
2 answers
3k views

How to install OpenCV without nVidia drivers

I have a laptop with on-board Intel graphics. I have been using OpenCV for years with this machine and I have managed to avoid manual compilation so far. But in Ubuntu 13.10, when I try to install ...
Subhamoy S.'s user avatar
3 votes
2 answers
11k views

use kinect camera as a webcam in ubuntu

I have a python openCV program that uses a webcam to track an image target. I switched computers, but this new computer does not have a webcam. I hooked up my kinect, installed stome stuff from ...
tekknolagi's user avatar
3 votes
1 answer
16k views

Capturing webcam video with OpenCV in WSL2

I am trying to access my webcam through OpenCV in WSL2 (Ubuntu). I found this blog post where it explains how to connect USB devices to WSL2. Running usbipd wsl list in windows command prompt lists ...
Terrarium's user avatar
  • 303
3 votes
3 answers
17k views

VIDEOIO ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV Unable to stop the stream: Device or resource busy

Running a private code that reads the data from the Webcam, I get the following error: Loading weights from handyolo/weights/000010.weights... Done! INFO:...
Mona Jalal's user avatar
  • 4,545
3 votes
2 answers
2k views

Ubuntu 18.04 error importing Opencv

I've installed Ubuntu 18.04. When I type: import cv2 I had an error: ImportError: /usr/lib/x86_64-linux-gnu/libtesseract.so.4: undefined symbol: pixaDisplayTiledInColumns
Robinson's user avatar
3 votes
2 answers
6k views

OpenCV undefined references for libQt5Core.so.5

Before starting, I would like to point out there actually is a very similar (probably exactly identical) question. However, I have been unable to solve my problem looking at the accepted answers. I ...
raggot's user avatar
  • 221
3 votes
2 answers
4k views

How to import Anaconda's modules in system's python?

I've installed opencv for Anaconda with this command: conda install opencv And when I run python3.6 in terminal , I can import cv2 module with any issue. So opencv has been installed for Anaconda'...
Ali Razmdideh's user avatar
3 votes
3 answers
7k views

opencv compiling error ippicv

When I write this to terminal: g++ LATCH_match.cpp -std=c++11 $(pkg-config opencv --cflags --libs) I've got an error like this: /usr/bin/ld: cannot find -lippicv collect2: error: ld returned 1 exit ...
M. Soylu's user avatar
3 votes
1 answer
4k views

fatal IO error 22 (Invalid argument) on X server ":0"

When trying to do openCV subplot on my Ubuntu 20.04 I get the following error The X11 connection broke: Maximum allowed requested length exceeded (code 4) XIO: fatal IO error 22 (Invalid argument) ...
Hossam Alzomor's user avatar
3 votes
0 answers
5k views

libcudnn.so.6 is not a symbolic link

While installing libopencv-dev using sudo apt-get install libopencv-dev i get following comments: Processing triggers for libc-bin (2.23-0ubuntu9) ... /sbin/ldconfig.real: /usr/local/cuda-8.0/targets/...
Hitesh's user avatar
  • 169
3 votes
0 answers
6k views

How can I install OpenCV 3.2.0 in Ubuntu 16.10 when it says sys/videoio.h is missing?

I'm following this tutorial http://www.pyimagesearch.com/2016/10/24/ubuntu-16-04-how-to-install-opencv/ to install OpenCV. I'm trying to install OpenCV 3.2.0 on Ubuntu 16.10. After I enter $ cmake -...
Soubriquet's user avatar
3 votes
1 answer
1k views

Ubuntu 13.10 blank screen with cursor after installing libopencv-dev

After installing libopencv-dev from the Ubuntu repository, I get a blank screen with cursor after logging into a session (after restarting the computer). I think there were some Nvidia-related ...
user219694's user avatar
3 votes
1 answer
2k views

How to control mouse cursor using c?

As in windows there is a function setCursorPos in windows.h for controlling cursor position. What is the way to do this in ubuntu?
user218205's user avatar
2 votes
3 answers
13k views

unable to locate package libfaac-dev

I'm trying with installing-opencv-2-4-9-in-ubuntu-14-04 in a tutorial.. sudo apt-get install build-essential libgtk2.0-dev libjpeg-dev libtiff4-dev libjasper-dev libopenexr-dev cmake python-dev ...
Riwa Ml's user avatar
  • 63
2 votes
2 answers
3k views

OpenCV Build Error: "Cannot open options file specified with @"

I am having trouble installing OpenCV on my machine. I run Ubuntu 12.04. I have followed this guide: http://www.raben.com/book/export/html/3 in order to install OpenCV 2.4.3 on my linux machine. ...
bolzano's user avatar
  • 121
2 votes
1 answer
2k views

Install from ppa:jonathonf/ffmpeg4 403 Forbidden [IP: 91.189.95.83 80]

I am (linux beginner) trying to install Opencv on Ubuntu bionic 18.04, following this git shell scripts to install different version of OpenCV instructions. But I'm getting a 403 Forbidden [IP: 91....
Fennec's user avatar
  • 125
2 votes
1 answer
22k views

Uninstall OpenCV 4.2.0 and its Libraries

I'm quite new to Ubuntu and I just installed opencv and some additional libraries using sudo apt update sudo apt install libopencv-dev python3-opencv ...
Ziad El-Massik's user avatar

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