Capture_and_display_V4L2_app

An app to capture frames from a camera using V4L2 and display using OpenCV

Prerequisites

You need to install OpenCV to be able to compile the application without having errors :

1. Install the required packages

$ sudo apt-get update
$ sudo apt-get install build-essential cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

2. Clone OpenCV repository

$ git clone https://github.com/opencv/opencv.git

3. Build and install OpenCV

$ cd opencv
$ mkdir build && cd build
$ cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
$ make -j8
$ sudo make install

4. Check OpenCV version

$ pkg-config --modversion opencv4

Running the sample

Command line (without using CMake)

Run the commands below

$ g++ -std=c++11 -Wall -I/usr/lib/opencv -I/usr/include/opencv4 v4l_capture.cpp -L/usr/lib -lopencv_core -lopencv_highgui -lopencv_videoio -o camera_cap
$ ./camera_cap

Using Cmake

Run the commands below

$ cd Capture_and_display_V4L2_app
$ mkdir build && cd build
$ cmake ..
$ sudo make
$ ./Capture_and_display_V4L2_app