Configure your development environment. There are two routes to use GStreamer in an Android application: Either writing your GStreamer code in Java or in C. It looks like there's still a problem with installing plugins from the Plugins menu. When you try to install cccam230 for the menu, the install succeeds but doesn't. Hardware video acceleration makes it possible for the video card to decode/encode video, thus offloading the CPU and saving power. There are several ways. It is the application's responsibility to ensure that, at runtime, GStreamer can access its libraries and plugins. It can be done by adding %GSTREAMER_SDK_ROOT_X86. Top-10 things to do after installing Fedora 23 to make as user friendly. by Magesh Maruthamuthu · Published on: November 15th, 2015 :: Last Updated on: February 1st. A: First, read About Fedora. You can also read the Fedora Project FAQ, if you want. Now, I'll give you a summary. You can think of Fedora 8 as something like.
Installing Open. CV on Debian Linux. In this post I will describe the process of installing Open. CV (both versions 2.
Debian Linux (especially Debian- 6). After installing, we will do some tests to verify the installation and also see some examples. As I was trying to install Open. CV on Debian I found that although there is lot of information on similar topics (see the references at the end), I still had to dig around a bit to understand the process completely. Some of the excellent guides are now outdated. Also, I found a few that have all the “what to do” but not “why to do”.
Then as I started jotting down my own notes into my One. Note notebook, I realized that I should share these notes with others who are interested. I hope to update this document as I find more useful information in future. Before installing the Prerequisites: It is recommended [Reference 2] that you update and upgrade your current system before installing Open.
In this post I will describe the process of installing OpenCV (both versions 2.4.2 and 2.4.3) on Debian Linux (especially Debian-6). After installing, we will do some. A: The Fedora Download Page. There are many versions: The 'Live Media' is a LiveCD--you can just put the CD into your computer and start the OS without installing it. This post shows you how to tweak your Fedora system and install additional apps to make your system more useful and user friendly. This includes installing must have.
CV. You can do this from the terminal using the following two commands. Install the Prerequisites: The following packages may be installed using the terminal [sudo apt- get install package- name] or using the synaptic package manager. The first 3 packages are NOT optional and must be installed. The commands are shown after the names of the packages: 2. The first 3 packages are required and not optional: build- essential (GCC 4. C/C++ compiler )cmake 2. The following packages are optional: libgtk.
GTK+ graphical user interfaces library. This is the default GUI backend for highgui on OSes other than Windows and Mac. OSX)python- dev (Python 2. Numpy)Use the following line of code to install all the 3 packages simultaneously. The packages below are used to read and write images in the respective formats (note, that if you don’t install these packages, Open. CV will use the default versions supplied with Open. CV. Also, openexr is not supplied, by default, with Open.
CV)libpng. 12- 0, libpng. NOTE: The reason of installing libjpeg.
For more information see FFMPEG)libswscale. HDR image file development tools)Use the following line of code to install all the packages mentioned above. The packages below are used to add video capturing, video decoding and video encoding capabilities to highgui. The output of the cmake will show which of the packages have been detected and will be used in highgui. IEEE1. 39. 4 digital cameras)libv. Use the following line of code to install the packages used for video processing. Other optional packages: swig (integrate C and C++ code with other languages like Python)bzip.
Debian distributions)You can also install other optional packages (depending on your needs) such aslibtbb- dev : parallelism library (TBB) for C++ – development fileslibqt. Qt 4 development files and Qt 4 Open. GL library development files. To use Qt (Qt 4. 6 or later) as the High. GUI backend (instead of GTK).
In such case, use WITH_QT=ON flag with Cmake when configuring Open. CV. texlive- latex- extra and python- sphinx: La.
Te. X supplementary packages (Te. X Live) and sphinx tool for producing documentation. C++ template library for linear algebrayasm : modular assembler with multiple syntaxes support. CUDA Toolkit with GPU support for Nvidia GPUs. IPP 7 or later — Open. CV doesnot require IPP, but can be configured to use IPP to make color conversion, Haar training and DFT functions run faster.
Download the Open. CV source from Source. Forge: For the purpose of this guide, I assume that your current working directory is “opencv”. This is where you are going to download the source code. At the time of this writing, the latest stable release is Open.
CV- 2. 4. 2. You may download the source tarball (Open. CV- 2. 4. 2. tar. Source. Forge either by using the browser or by using the following command in current working directory.
Open. CV- 2. 4. 2. Note: If you try to build the above version of Open. CV on Debian 6 using the standard instructions that are available, you will most likely get some build errors (explained later at the appropriate place) due to some errors in the ZLIB library that comes along with Open. CV. Resolving this error is very simple.
Also, the said error has been fixed in the latest 2. Open. CV, i. e. Open.
CV- 2. 4. 3. tar. Also, you may download it using the command. Open. CV- 2. 4. 3. Extract Open. CV source code. Once you have downloaded the tarball, extract it using the command.
Open. CV- 2. 4. 2. Open. CV- 2. 4. 3. The above command will extract the source code into a directory called “Open. CV- 2. 4. 2” or “Open. CV- 2. 4. 3” respectively. Building Open. CVfrom source using CMake command line. Open. CV- 2. 4. 2 (or Open.
CV- 2. 4. 3) directory. Open. CV- 2. 4. 2 (or cd ~/opencv/Open. CV- 2. 4. 3). 5. 2. Create a directory called “release” within the above directory and “cd” to the release directory. Configure Open. CV build by running Cmake.
This step generates a makefile (to be used by make later) that defines which parts of Open. CV needs to be compiled.
The syntax for the cmake commad is: cmake [< some optional parameters> ] < path to the Open. CV source directory> If you are configuring Open. CV- 2. 4. 2 and you want to install Open.
CV with Python support, you can use the following command. D CMAKE_BUILD_TYPE=RELEASE - D CMAKE_INSTALL_PREFIX=/usr/local - D BUILD_ZLIB=ON - D BUILD_PYTHON_SUPPORT=ON ~/opencv/Open.
CV- 2. 4. 2. Note: The switch that must be turned ON in order to avoid build errors using the Open. CV- 2. 4. 2 is the “BUILD_ZLIB=ON” option.
The following command is what I used (to configure Open. CV with Python, Open. EXR, Gstreamer, video capture and v. D CMAKE_BUILD_TYPE=RELEASE - D CMAKE_INSTALL_PREFIX=/usr/local - D BUILD_ZLIB=ON - D WITH_V4.
L=ON - D WITH_GSTREAMER=ON - D WITH_OPENEXR=ON - D WITH_UNICAP=ON - D BUILD_PYTHON_SUPPORT=ON - D INSTALL_C_EXAMPLES=ON - D INSTALL_PYTHON_EXAMPLES=ON - D BUILD_EXAMPLES=ON .. Note: In the above command, “~/opencv/Open. CV- 2. 4. 2” has been replaced with just “.” (two dots) at the end of the command. It is an argument to cmake to indicate that the source directory is the parent directory (of the current “release” directory). If you are configuring Open. CV- 2. 4. 3, you don’t need to use the “BUILD_ZLIB=ON” switch.
D CMAKE_BUILD_TYPE=RELEASE - D CMAKE_INSTALL_PREFIX=/usr/local - D WITH_V4. L=ON - D WITH_GSTREAMER=ON - D WITH_OPENEXR=ON - D WITH_UNICAP=ON - D BUILD_PYTHON_SUPPORT=ON - D INSTALL_C_EXAMPLES=ON - D INSTALL_PYTHON_EXAMPLES=ON - D BUILD_EXAMPLES=ON .. You should expect to see something similar to the following at the end of a successful configuration step: Portion of the CMake configuration output step.
Generally, you should not see any errors in the above step. If you do, make sure that you have installed all the required packages. Also ensure that you have the following flags in the output of the CMake configuration step set to “YES”: If you are interested in working with video, ensure that the following are also set to “YES”: GStreamer: YESV4. L/V4. L2: YES5. 4. Compile using GCC from the command line (within the “release” directory) by running “make”.
This is where you may see an “error” if you did not use “BUILD_ZLIB=ON” option during the configuration using cmake for Open. CV- 2. 4. 2. (If you are interested to know more about this error you can see here.)6. Installing Open. CV libraries. From the command line (within the “release” directory), execute the following command.
Note: It is NOT necessary to “install” Open. CV if you are using CMake (and, therefore, Open. CVConfig. cmake) for your projects. In fact it is not recommended to actually install Open.
CV using “make install” especially if you plan to use different Open. CV versions. If you don’t install, then use Open. CV from where you built it [Reference 4]. Configuring Open. CV path. 7. 1. Configure the system wide library search path: The path to the Open. CV libraries (/usr/local/lib) is specified by creating a file called “opencv. In order to do so, append the line “/usr/local/lib” at the end of the file “opencv.
Configuration of Open. CV search path. Now, to configure the library, run the following command. In this case, running the ldconfig command creates the necessary links and cache to the most recent shared libraries found (Open. CV libraries in our case) in the directories specified in the file /etc/ld. Note: (alternatively you could do the following)(I haven’t verified this step) Instead of creating the file “opencv. Reference 3]: Export the path to LD_LIBRARY_PATH environment variable, and dynamically link to the Open. CV library using ldconfig [Reference 3] (do this ONLY if you didn’t do sudo gedit /etc/ld.
LD_LIBRARY_PATH=/usr/local/lib/: $LD_LIBRARY_PATH. Also, should you choose to avoid installing Open. CV library, you need to explicitly direct your system to the Open.
CV library build directory by executing the following commands (assuming that you built Open. CV in the directory “~/opencv/Open. CV- 2. 4. 3/release/”). LD_LIBRARY_PATH=~/opencv/Open. CV- 2. 0. 3/release/: $LD_LIBRARY_PATH. Setup the PKG_CONFIG_PATH variable. Now open the “bash.
Add the following two lines to the “bash. PKG_CONFIG_PATH=$PKG_CONFIG_PATH: /usr/local/lib/pkgconfig.
PKG_CONFIG_PATH. bash. That brings us to the end of the Open. CV installation on Debian- 6. Before, testing the installation, it is highly recommended, that you restart the computer.
Test Open. CV installation 8. Test C samples: We shall test the Open. CV installation by building and running the Open.
CV samples. cd ~/opencv/Open. CV- 2. 4. 3/samples/c. We would like to build all the examples in the directory by using the script “build_all. However, before doing so, we need to ensure that the script is executable. Now we will try some examples: First one, is going to be the “delaunay” example.
Run the example using the following command in the terminal (assuming that we are in the same directory). Output: Output of the sample code delaunay. Second, let’s try the “morphology” example. Output: Output of the sample morphologyc. See some more examples in References 2 & 3.