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Merge pull request #620 from apavlenko:java_tutorial_fix

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doc/tutorials/introduction/desktop_java/java_dev_intro.rst
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@ -5,8 +5,6 @@
Introduction to Java Development Introduction to Java Development
******************************** ********************************
Last updated: 28 February, 2013.
As of OpenCV 2.4.4, OpenCV supports desktop Java development using nearly the same interface as for As of OpenCV 2.4.4, OpenCV supports desktop Java development using nearly the same interface as for
Android development. This guide will help you to create your first Java (or Scala) application using OpenCV. Android development. This guide will help you to create your first Java (or Scala) application using OpenCV.
We will use either `Eclipse <http://eclipse.org/>`_, `Apache Ant <http://ant.apache.org/>`_ or the We will use either `Eclipse <http://eclipse.org/>`_, `Apache Ant <http://ant.apache.org/>`_ or the
@ -15,7 +13,7 @@ We will use either `Eclipse <http://eclipse.org/>`_, `Apache Ant <http://ant.apa
For further reading after this guide, look at the :ref:`Android_Dev_Intro` tutorials. For further reading after this guide, look at the :ref:`Android_Dev_Intro` tutorials.
What we'll do in this guide What we'll do in this guide
*************************** ===========================
In this guide, we will: In this guide, we will:
@ -29,12 +27,12 @@ The same process was used to create the samples in the :file:`samples/java` fold
so consult those files if you get lost. so consult those files if you get lost.
Get proper OpenCV Get proper OpenCV
***************** =================
Starting from version 2.4.4 OpenCV includes desktop Java bindings. Starting from version 2.4.4 OpenCV includes desktop Java bindings.
Download Download
######## --------
The most simple way to get it is downloading the appropriate package of **version 2.4.4 or higher** from the The most simple way to get it is downloading the appropriate package of **version 2.4.4 or higher** from the
`OpenCV SourceForge repository <http://sourceforge.net/projects/opencvlibrary/files/>`_. `OpenCV SourceForge repository <http://sourceforge.net/projects/opencvlibrary/files/>`_.
@ -50,30 +48,30 @@ In order to build OpenCV with Java bindings you need :abbr:`JDK (Java Developmen
`Apache Ant <http://ant.apache.org/>`_ and `Python` v2.6 or higher to be installed. `Apache Ant <http://ant.apache.org/>`_ and `Python` v2.6 or higher to be installed.
Build Build
##### -----
Let's build OpenCV: Let's build OpenCV:
.. code-block:: bash .. code-block:: bash
git clone git://github.com/Itseez/opencv.git git clone git://github.com/Itseez/opencv.git
cd opencv cd opencv
git checkout 2.4 git checkout 2.4
mkdir build mkdir build
cd build cd build
Generate a Makefile or a MS Visual Studio* solution, or whatever you use for Generate a Makefile or a MS Visual Studio* solution, or whatever you use for
building executables in your system: building executables in your system:
.. code-block:: bash .. code-block:: bash
cmake -DBUILD_SHARED_LIBS=OFF .. cmake -DBUILD_SHARED_LIBS=OFF ..
or or
.. code-block:: bat .. code-block:: bat
cmake -DBUILD_SHARED_LIBS=OFF -G "Visual Studio 10" .. cmake -DBUILD_SHARED_LIBS=OFF -G "Visual Studio 10" ..
.. note:: When OpenCV is built as a set of **static** libraries (``-DBUILD_SHARED_LIBS=OFF`` option) .. note:: When OpenCV is built as a set of **static** libraries (``-DBUILD_SHARED_LIBS=OFF`` option)
the Java bindings dynamic library is all-sufficient, the Java bindings dynamic library is all-sufficient,
@ -83,9 +81,9 @@ Examine the output of CMake and ensure ``java`` is one of the modules "To be bui
If not, it's likely you're missing a dependency. You should troubleshoot by looking If not, it's likely you're missing a dependency. You should troubleshoot by looking
through the CMake output for any Java-related tools that aren't found and installing them. through the CMake output for any Java-related tools that aren't found and installing them.
.. image:: images/cmake_output.png .. image:: images/cmake_output.png
:alt: CMake output :alt: CMake output
:align: center :align: center
.. note:: If ``CMake`` can't find Java in your system set the ``JAVA_HOME`` .. note:: If ``CMake`` can't find Java in your system set the ``JAVA_HOME``
environment variable with the path to installed JDK environment variable with the path to installed JDK
@ -99,23 +97,23 @@ through the CMake output for any Java-related tools that aren't found and instal
Now start the build: Now start the build:
.. code-block:: bash .. code-block:: bash
make -j8 make -j8
or or
.. code-block:: bat .. code-block:: bat
msbuild /m OpenCV.sln /t:Build /p:Configuration=Release /v:m msbuild /m OpenCV.sln /t:Build /p:Configuration=Release /v:m
Besides all this will create a ``jar`` containing the Java interface (:file:`bin/opencv-244.jar`) Besides all this will create a ``jar`` containing the Java interface (:file:`bin/opencv-244.jar`)
and a native dynamic library containing Java bindings and all the OpenCV stuff and a native dynamic library containing Java bindings and all the OpenCV stuff
(:file:`bin/Release/opencv_java244.dll` or :file:`lib/libopencv_java244.so` respectively). (:file:`lib/libopencv_java244.so` or :file:`bin/Release/opencv_java244.dll` respectively).
We'll use these files later. We'll use these files later.
Java sample with Ant Java sample with Ant
******************** ====================
.. note:: .. note::
The described sample is provided with OpenCV library in the :file:`opencv/samples/java/ant` folder. The described sample is provided with OpenCV library in the :file:`opencv/samples/java/ant` folder.
@ -124,8 +122,8 @@ Java sample with Ant
* In this folder create the :file:`build.xml` file with the following content using any text editor: * In this folder create the :file:`build.xml` file with the following content using any text editor:
.. code-block:: xml .. code-block:: xml
:linenos: :linenos:
<project name="SimpleSample" basedir="." default="rebuild-run"> <project name="SimpleSample" basedir="." default="rebuild-run">
@ -177,18 +175,18 @@ Java sample with Ant
</project> </project>
.. note:: .. note::
This XML file can be reused for building other Java applications. This XML file can be reused for building other Java applications.
It describes a common folder structure in the lines 3 - 12 and common targets It describes a common folder structure in the lines 3 - 12 and common targets
for compiling and running the application. for compiling and running the application.
When reusing this XML don't forget to modify the project name in the line 1, When reusing this XML don't forget to modify the project name in the line 1,
that is also the name of the `main` class (line 14). that is also the name of the `main` class (line 14).
The paths to OpenCV `jar` and `jni lib` are expected as parameters The paths to OpenCV `jar` and `jni lib` are expected as parameters
(``"${ocvJarDir}"`` in line 5 and ``"${ocvLibDir}"`` in line 37), but (``"${ocvJarDir}"`` in line 5 and ``"${ocvLibDir}"`` in line 37), but
you can hardcode these paths for your convenience. you can hardcode these paths for your convenience.
See `Ant documentation <http://ant.apache.org/manual/>`_ for detailed description See `Ant documentation <http://ant.apache.org/manual/>`_ for detailed description
of its build file format. of its build file format.
* Create an :file:`src` folder next to the :file:`build.xml` file and a :file:`SimpleSample.java` file in it. * Create an :file:`src` folder next to the :file:`build.xml` file and a :file:`SimpleSample.java` file in it.
@ -236,99 +234,99 @@ Java sample with Ant
:align: center :align: center
Java project in Eclipse Java project in Eclipse
*********************** =======================
Now let's look at the possiblity of using OpenCV in Java when developing in Eclipse IDE. Now let's look at the possiblity of using OpenCV in Java when developing in Eclipse IDE.
* Create a new Eclipse workspace * Create a new Eclipse workspace
* Create a new Java project via :guilabel:`File --> New --> Java Project` * Create a new Java project via :guilabel:`File --> New --> Java Project`
.. image:: images/eclipse_new_java_prj.png .. image:: images/eclipse_new_java_prj.png
:alt: Eclipse: new Java project :alt: Eclipse: new Java project
:align: center :align: center
Call it say "HelloCV". Call it say "HelloCV".
* Open :guilabel:`Java Build Path` tab on :guilabel:`Project Properties` dialog * Open :guilabel:`Java Build Path` tab on :guilabel:`Project Properties` dialog
and configure additional library (OpenCV) reference (jar and native library location): and configure additional library (OpenCV) reference (jar and native library location):
.. image:: images/eclipse_user_lib.png .. image:: images/eclipse_user_lib.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` ` |
.. image:: images/eclipse_user_lib2.png .. image:: images/eclipse_user_lib2.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` ` |
.. image:: images/eclipse_user_lib3.png .. image:: images/eclipse_user_lib3.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` ` |
.. image:: images/eclipse_user_lib4.png .. image:: images/eclipse_user_lib4.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` ` |
.. image:: images/eclipse_user_lib5.png .. image:: images/eclipse_user_lib5.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` ` |
.. image:: images/eclipse_user_lib6.png .. image:: images/eclipse_user_lib6.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` ` |
.. image:: images/eclipse_user_lib7.png .. image:: images/eclipse_user_lib7.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` ` |
.. image:: images/eclipse_user_lib8.png .. image:: images/eclipse_user_lib8.png
:alt: Eclipse: external JAR :alt: Eclipse: external JAR
:align: center :align: center
` `
* Add a new Java class (say ``Main``) containing the application entry: * Add a new Java class (say ``Main``) containing the application entry:
.. image:: images/eclipse_main_class.png .. image:: images/eclipse_main_class.png
:alt: Eclipse: Main class :alt: Eclipse: Main class
:align: center :align: center
* Put some simple OpenCV calls there, e.g.: * Put some simple OpenCV calls there, e.g.:
.. code-block:: java
import org.opencv.core.Core; .. code-block:: java
import org.opencv.core.CvType;
import org.opencv.core.Mat;
public class Main { import org.opencv.core.Core;
public static void main(String[] args) { import org.opencv.core.CvType;
System.loadLibrary(Core.NATIVE_LIBRARY_NAME); import org.opencv.core.Mat;
Mat m = Mat.eye(3, 3, CvType.CV_8UC1);
System.out.println("m = " + m.dump()); public class Main {
} public static void main(String[] args) {
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
Mat m = Mat.eye(3, 3, CvType.CV_8UC1);
System.out.println("m = " + m.dump());
} }
}
* Press :guilabel:`Run` button and find the identity matrix content in the Eclipse ``Console`` window. * Press :guilabel:`Run` button and find the identity matrix content in the Eclipse ``Console`` window.
.. image:: images/eclipse_run.png .. image:: images/eclipse_run.png
:alt: Eclipse: run :alt: Eclipse: run
:align: center :align: center
SBT project for Java and Scala SBT project for Java and Scala
****************************** ==============================
Now we'll create a simple Java application using SBT. This serves as a brief introduction to Now we'll create a simple Java application using SBT. This serves as a brief introduction to
those unfamiliar with this build tool. We're using SBT because it is particularly easy and powerful. those unfamiliar with this build tool. We're using SBT because it is particularly easy and powerful.
@ -338,66 +336,66 @@ First, download and install `SBT <http://www.scala-sbt.org/>`_ using the instruc
Next, navigate to a new directory where you'd like the application source to live (outside :file:`opencv` dir). Next, navigate to a new directory where you'd like the application source to live (outside :file:`opencv` dir).
Let's call it "JavaSample" and create a directory for it: Let's call it "JavaSample" and create a directory for it:
.. code-block:: bash .. code-block:: bash
cd <somewhere outside opencv> cd <somewhere outside opencv>
mkdir JavaSample mkdir JavaSample
Now we will create the necessary folders and an SBT project: Now we will create the necessary folders and an SBT project:
.. code-block:: bash .. code-block:: bash
cd JavaSample cd JavaSample
mkdir -p src/main/java # This is where SBT expects to find Java sources mkdir -p src/main/java # This is where SBT expects to find Java sources
mkdir project # This is where the build definitions live mkdir project # This is where the build definitions live
Now open :file:`project/build.scala` in your favorite editor and paste the following. Now open :file:`project/build.scala` in your favorite editor and paste the following.
It defines your project: It defines your project:
.. code-block:: scala .. code-block:: scala
import sbt._ import sbt._
import Keys._ import Keys._
object JavaSampleBuild extends Build { object JavaSampleBuild extends Build {
def scalaSettings = Seq( def scalaSettings = Seq(
scalaVersion := "2.10.0", scalaVersion := "2.10.0",
scalacOptions ++= Seq( scalacOptions ++= Seq(
"-optimize", "-optimize",
"-unchecked", "-unchecked",
"-deprecation" "-deprecation"
) )
) )
def buildSettings = def buildSettings =
Project.defaultSettings ++ Project.defaultSettings ++
scalaSettings scalaSettings
lazy val root = { lazy val root = {
val settings = buildSettings ++ Seq(name := "JavaSample") val settings = buildSettings ++ Seq(name := "JavaSample")
Project(id = "JavaSample", base = file("."), settings = settings) Project(id = "JavaSample", base = file("."), settings = settings)
} }
} }
Now edit :file:`project/plugins.sbt` and paste the following. Now edit :file:`project/plugins.sbt` and paste the following.
This will enable auto-generation of an Eclipse project: This will enable auto-generation of an Eclipse project:
.. code-block:: scala .. code-block:: scala
addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.1.0") addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.1.0")
Now run ``sbt`` from the :file:`JavaSample` root and from within SBT run ``eclipse`` to generate an eclipse project: Now run ``sbt`` from the :file:`JavaSample` root and from within SBT run ``eclipse`` to generate an eclipse project:
.. code-block:: bash .. code-block:: bash
sbt # Starts the sbt console sbt # Starts the sbt console
> eclipse # Running "eclipse" from within the sbt console > eclipse # Running "eclipse" from within the sbt console
You should see something like this: You should see something like this:
.. image:: images/sbt_eclipse.png .. image:: images/sbt_eclipse.png
:alt: SBT output :alt: SBT output
:align: center :align: center
You can now import the SBT project to Eclipse using :guilabel:`Import ... -> Existing projects into workspace`. You can now import the SBT project to Eclipse using :guilabel:`Import ... -> Existing projects into workspace`.
Whether you actually do this is optional for the guide; Whether you actually do this is optional for the guide;
@ -406,28 +404,28 @@ we'll be using SBT to build the project, so if you choose to use Eclipse it will
To test that everything is working, create a simple "Hello OpenCV" application. To test that everything is working, create a simple "Hello OpenCV" application.
Do this by creating a file :file:`src/main/java/HelloOpenCV.java` with the following contents: Do this by creating a file :file:`src/main/java/HelloOpenCV.java` with the following contents:
.. code-block:: java .. code-block:: java
public class HelloOpenCV { public class HelloOpenCV {
public static void main(String[] args) { public static void main(String[] args) {
System.out.println("Hello, OpenCV"); System.out.println("Hello, OpenCV");
} }
} }
Now execute ``run`` from the sbt console, or more concisely, run ``sbt run`` from the command line: Now execute ``run`` from the sbt console, or more concisely, run ``sbt run`` from the command line:
.. code-block:: bash .. code-block:: bash
sbt run sbt run
You should see something like this: You should see something like this:
.. image:: images/sbt_run.png .. image:: images/sbt_run.png
:alt: SBT run :alt: SBT run
:align: center :align: center
Running SBT samples Running SBT samples
################### -------------------
Now we'll create a simple face detection application using OpenCV. Now we'll create a simple face detection application using OpenCV.
@ -435,17 +433,17 @@ First, create a :file:`lib/` folder and copy the OpenCV jar into it.
By default, SBT adds jars in the lib folder to the Java library search path. By default, SBT adds jars in the lib folder to the Java library search path.
You can optionally rerun ``sbt eclipse`` to update your Eclipse project. You can optionally rerun ``sbt eclipse`` to update your Eclipse project.
.. code-block:: bash .. code-block:: bash
mkdir lib mkdir lib
cp <opencv_dir>/build/bin/opencv_<version>.jar lib/ cp <opencv_dir>/build/bin/opencv_<version>.jar lib/
sbt eclipse sbt eclipse
Next, create the directory :file:`src/main/resources` and download this Lena image into it: Next, create the directory :file:`src/main/resources` and download this Lena image into it:
.. image:: images/lena.png .. image:: images/lena.png
:alt: Lena :alt: Lena
:align: center :align: center
Make sure it's called :file:`"lena.png"`. Make sure it's called :file:`"lena.png"`.
Items in the resources directory are available to the Java application at runtime. Items in the resources directory are available to the Java application at runtime.
@ -453,9 +451,9 @@ Items in the resources directory are available to the Java application at runtim
Next, copy :file:`lbpcascade_frontalface.xml` from :file:`opencv/data/lbpcascades/` into the :file:`resources` Next, copy :file:`lbpcascade_frontalface.xml` from :file:`opencv/data/lbpcascades/` into the :file:`resources`
directory: directory:
.. code-block:: bash .. code-block:: bash
cp <opencv_dir>/data/lbpcascades/lbpcascade_frontalface.xml src/main/resources/ cp <opencv_dir>/data/lbpcascades/lbpcascade_frontalface.xml src/main/resources/
Now modify src/main/java/HelloOpenCV.java so it contains the following Java code: Now modify src/main/java/HelloOpenCV.java so it contains the following Java code:
@ -519,21 +517,21 @@ You will also get errors if you try to load OpenCV when it has already been load
Now run the face detection app using ``sbt run``: Now run the face detection app using ``sbt run``:
.. code-block:: bash .. code-block:: bash
sbt run sbt run
You should see something like this: You should see something like this:
.. image:: images/sbt_run_face.png .. image:: images/sbt_run_face.png
:alt: SBT run :alt: SBT run
:align: center :align: center
It should also write the following image to :file:`faceDetection.png`: It should also write the following image to :file:`faceDetection.png`:
.. image:: images/faceDetection.png .. image:: images/faceDetection.png
:alt: Detected face :alt: Detected face
:align: center :align: center
You're done! You're done!
Now you have a sample Java application working with OpenCV, so you can start the work on your own. Now you have a sample Java application working with OpenCV, so you can start the work on your own.

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modules/java/CMakeLists.txt
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@ -301,16 +301,14 @@ endif()
# Additional target properties # Additional target properties
set_target_properties(${the_module} PROPERTIES set_target_properties(${the_module} PROPERTIES
OUTPUT_NAME "${the_module}${LIB_NAME_SUFIX}" OUTPUT_NAME "${the_module}${LIB_NAME_SUFIX}"
#DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
ARCHIVE_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} ARCHIVE_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH}
LIBRARY_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH}
RUNTIME_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH} RUNTIME_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH}
INSTALL_NAME_DIR ${OPENCV_LIB_INSTALL_PATH} INSTALL_NAME_DIR ${OPENCV_LIB_INSTALL_PATH}
LINK_INTERFACE_LIBRARIES "" LINK_INTERFACE_LIBRARIES ""
) )
if(ANDROID) if(WIN32)
set_target_properties(${the_module} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH})
else()
set_target_properties(${the_module} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH}) set_target_properties(${the_module} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH})
endif() endif()