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changing layout, adding ant and eclipse sections, more pictures

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doc/tutorials/definitions/tocDefinitions.rst
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......@@ -8,4 +8,4 @@
.. |Author_FernandoI| unicode:: Fernando U+0020 Iglesias U+0020 Garc U+00ED a
.. |Author_EduardF| unicode:: Eduard U+0020 Feicho
.. |Author_AlexB| unicode:: Alexandre U+0020 Benoit
.. |Author_EricCh| unicode:: Eric U+0020 Christiansen
doc/tutorials/introduction/desktop_java/java_dev_intro.rst
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......@@ -5,78 +5,323 @@
Introduction to Java Development
********************************
Last updated: 20 January, 2013.
Last updated: 12 February, 2013.
As of OpenCV 2.4.4, OpenCV supports desktop Java development using nearly the same interface as for Android development.
This guide will take you from the raw OpenCV source to a working Java application.
We will use the `Simple Build Tool (SBT) <http://www.scala-sbt.org/>`_ to build our Java application and to generate an Eclipse project.
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.
We will use either `Eclipse <http://eclipse.org/>`_, `Apache Ant <http://ant.apache.org/>`_ or the
`Simple Build Tool (SBT) <http://www.scala-sbt.org/>`_ to build the application.
For further reading after this guide, look at the Android tutorials. The interfaces for desktop Java and Android are nearly identical. You may also consult the `Java wiki page <http://code.opencv.org/projects/opencv/wiki/Java_API_howto>`_.
For further reading after this guide, look at the :ref:`Android_Dev_Intro` tutorials.
The interfaces for desktop Java and Android are nearly identical. You may also consult the
`Java wiki page <http://code.opencv.org/projects/opencv/wiki/Java_API_howto>`_.
What we'll do in this guide
***************************
In this guide, we will:
* Download the OpenCV source from Github
* Get OpenCV with desktop Java support
* Build OpenCV and the Java wrappers and install OpenCV
* Create an ``Ant``, ``Eclipse`` or ``SBT`` project
* Create an SBT project and use it to generate an Eclipse project
* Write a simple OpenCV application in Java or Scala
* Copy the generated OpenCV jar into the SBT project and write a simple OpenCV application
The same process was used to create the samples in the :file:`samples/java` folder of the OpenCV repository,
so consult those files if you get lost.
The same process was used to create the samples in the samples/java folder of the OpenCV repository, so consult those files if you get lost.
Get OpenCV with desktop Java support
************************************
Download the OpenCV source from Github
**************************************
Starting from version 2.4.4 OpenCV includes desktop Java bindings.
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/>`_.
The OpenCV repository is hosted on `Github <https://github.com/Itseez/opencv/>`_.
.. note:: Windows users can find the prebuilt files needed for Java development in the
:file:`opencv/build/java/` folder inside the package.
Other OSes users (and Windows ones optionally) can build OpenCV from sources locally.
To download the repository, enter the following in a terminal:
Another option to get OpenCV sources is to clone OpenCV git repository,
either the primary one at ``git://code.opencv.org/opencv.git`` or
its `Github mirror <https://github.com/Itseez/opencv/>`_.
Be aware that Java is currently only supported on the ``2.4`` git branch and not yet merged to the ``master``.
In order to build OpenCV with Java bindings you need :abbr:`JDK (Java Development Kit)`
(we recommend `Oracle/Sun JDK 6 or 7 <http://www.oracle.com/technetwork/java/javase/downloads/>`_),
`Apache Ant <http://ant.apache.org/>`_ and ``Python`` v2.6 or higher to be installed.
.. code-block:: bash
Build OpenCV
############
git clone https://github.com/Itseez/opencv.git
Let's build OpenCV:
This will create a directory "opencv". Enter it.
.. code-block:: bash
Build OpenCV and the Java wrappers and install OpenCV
*****************************************************
git clone git://github.com/Itseez/opencv.git
cd opencv
git checkout 2.4
mkdir build
cd build
Java is currently only supported on the 2.4 git branch. This may change in the future, but for now you must switch to that branch:
Generate a Makefile or a MS Visual Studio* solution, or whatever you use for
building executables in your system:
.. code-block:: bash
git checkout 2.4
cmake -DBUILD_SHARED_LIBS=OFF ..
To build the Java wrapper, first make sure you have Java 1.6+ and Apache Ant installed. Then invoke cmake with the DBUILD_opencv_java flag turned ON:
or
.. code-block:: bash
.. code-block:: bat
mkdir build
cd build
cmake .. -DBUILD_opencv_java=ON
cmake -DBUILD_SHARED_LIBS=OFF -G "Visual Studio 10" ..
Examine the output of CMake and ensure "java" is one of the modules "To be built". 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.
.. note:: When OpenCV is built as a set of **static** libraries (``-DBUILD_SHARED_LIBS=OFF`` option)
the Java bindings dynamic library is all-sufficient,
i.e. doesn't depend on other OpenCV libs, but includes all the OpenCV code inside.
Examine the output of CMake and ensure ``java`` is one of the modules "To be built".
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.
.. image:: images/cmake_output.png
:alt: CMake output
:align: center
Now build and install everything:
Now start the build:
.. code-block:: bash
make -j8
sudo make install
In addition to building and installing C++ libraries to your system, this will write a jar containing the Java interface to bin/opencv_<version>.jar. We'll use this jar later.
or
.. code-block:: bat
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_2.4.4.jar`)
and a native dynamic library containing Java bindings and all the OpenCV stuff
(:file:`bin/Release/opencv_java244.dll` or :file:`bin/libopencv_java244.so` respectively).
We'll use these files later.
Create a simple Java sample and an Ant build file for it
********************************************************
.. note::
The described sample is provided with OpenCV library in the :file:`opencv/samples/java/ant` folder.
* Create a folder where you'll create this sample application.
* In this folder create an XML file with the following content using any text editor:
.. code-block:: xml
:linenos:
<project name="SimpleSample" basedir="." default="rebuild-run">
<property name="src.dir" value="src"/>
<property name="lib.dir" value="${ocvJarDir}"/>
<path id="classpath">
<fileset dir="${lib.dir}" includes="**/*.jar"/>
</path>
<property name="build.dir" value="build"/>
<property name="classes.dir" value="${build.dir}/classes"/>
<property name="jar.dir" value="${build.dir}/jar"/>
<property name="main-class" value="${ant.project.name}"/>
<target name="clean">
<delete dir="${build.dir}"/>
</target>
<target name="compile">
<mkdir dir="${classes.dir}"/>
<javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>
</target>
<target name="jar" depends="compile">
<mkdir dir="${jar.dir}"/>
<jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
<manifest>
<attribute name="Main-Class" value="${main-class}"/>
</manifest>
</jar>
</target>
<target name="run" depends="jar">
<java fork="true" classname="${main-class}">
<sysproperty key="java.library.path" path="${ocvLibDir}"/>
<classpath>
<path refid="classpath"/>
<path location="${jar.dir}/${ant.project.name}.jar"/>
</classpath>
</java>
</target>
<target name="rebuild" depends="clean,jar"/>
<target name="rebuild-run" depends="clean,run"/>
</project>
.. note::
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
for compiling and running the application.
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).
The paths to OpenCV `jar` and `jni lib` are expected as parameters
(``"${ocvJarDir}"`` in line 5 and ``"${ocvLibDir}"`` in line 37), but
you can hardcode these paths for your convenience.
See `Ant documentation <http://ant.apache.org/manual/>`_ for detailed description
of its build file format.
* Create an :file:`src` folder nect to the :file:`build.xml` file and a :file:`SimpleSample.java` file in it.
* Put the following Java code into the :file:`SimpleSample.java` file:
.. code-block:: java
import org.opencv.core.Mat;
import org.opencv.core.CvType;
import org.opencv.core.Scalar;
class SimpleSample {
static{ System.loadLibrary("opencv_java244"); }
public static void main(String[] args) {
Mat m = new Mat(5, 10, CvType.CV_8UC1, new Scalar(0));
System.out.println("OpenCV Mat: " + m);
Mat mr1 = m.row(1);
mr1.setTo(new Scalar(1));
Mat mc5 = m.col(5);
mc5.setTo(new Scalar(5));
System.out.println("OpenCV Mat data:\n" + m.dump());
}
}
* run the following command in console in the folder containing :file:`build.xml`:
.. code-block:: bash
ant -DocvJarDir=path/to/dir/containing/opencv-244.jar -DocvLibDir=path/to/dir/containing/opencv_java244/native/library
For example:
Create an SBT project and use it to generate an Eclipse project
*****************************************************************
.. code-block:: bat
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.
ant -DocvJarDir=X:\opencv-2.4.4\bin -DocvLibDir=X:\opencv-2.4.4\bin\Release
First, download and install SBT using the instructions `here <http://www.scala-sbt.org/>`_.
The command should initiate [re]building and running the sample.
You should see on the screen something like this:
Next, navigate to a new directory where you'd like the application source to live (outside opencv). Let's call it "JavaSample" and create a directory for it:
.. image:: images/ant_output.png
:alt: run app with Ant
:align: center
Create a simple Java project in Eclipse
***************************************
* Create a new Eclipse workspace
* Create a new Java project via :guilabel:`File --> New --> Java Project`
.. image:: images/eclipse_new_java_prj.png
:alt: Eclipse: new Java project
:align: center
Call it say "HelloCV".
* Open :guilabel:`Java Build Path` tab on :guilabel:`Project Properties` dialog
and configure additional library (OpenCV) reference (jar and native library location):
.. image:: images/eclipse_user_lib.png
:alt: Eclipse: external JAR
:align: center
` `
.. image:: images/eclipse_user_lib2.png
:alt: Eclipse: external JAR
:align: center
` `
.. image:: images/eclipse_user_lib3.png
:alt: Eclipse: external JAR
:align: center
` `
.. image:: images/eclipse_user_lib4.png
:alt: Eclipse: external JAR
:align: center
` `
.. image:: images/eclipse_user_lib5.png
:alt: Eclipse: external JAR
:align: center
` `
.. image:: images/eclipse_user_lib6.png
:alt: Eclipse: external JAR
:align: center
` `
.. image:: images/eclipse_user_lib7.png
:alt: Eclipse: external JAR
:align: center
` `
.. image:: images/eclipse_user_lib8.png
:alt: Eclipse: external JAR
:align: center
` `
* Add a new Java class (say ``Main``) containing the application entry:
.. image:: images/eclipse_main_class.png
:alt: Eclipse: Main class
:align: center
* Put a simple OpenCV calls there, e.g.:
.. code-block:: java
import org.opencv.core.CvType;
import org.opencv.core.Mat;
public class Main {
public static void main(String[] args) {
System.loadLibrary("opencv_java244");
Mat m = Mat.eye(3, 3, CvType.CV_8UC1);
System.out.println("m = " + m.dump());
}
}
* Press :guilabel:`Run` button and see the identity matrix content in the Eclipse ``Console`` window.
.. image:: images/eclipse_run.png
:alt: Eclipse: run
:align: center
Create an SBT project and samples in Java and Scala
***************************************************
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.
First, download and install `SBT <http://www.scala-sbt.org/>`_ using the instructions on its `web site <http://www.scala-sbt.org/>`_.
Next, navigate to a new directory where you'd like the application source to live (outside opencv).
Let's call it "JavaSample" and create a directory for it:
.. code-block:: bash
......@@ -91,40 +336,42 @@ Now we will create the necessary folders and an SBT project:
mkdir -p src/main/java # This is where SBT expects to find Java sources
mkdir project # This is where the build definitions live
Now open project/build.scala in your favorite editor and paste the following. It defines your project:
Now open :file:`project/build.scala` in your favorite editor and paste the following.
It defines your project:
.. code-block:: scala
import sbt._
import Keys._
import sbt._
import Keys._
object JavaSampleBuild extends Build {
def scalaSettings = Seq(
scalaVersion := "2.10.0",
scalacOptions ++= Seq(
"-optimize",
"-unchecked",
"-deprecation"
)
)
object JavaSampleBuild extends Build {
def scalaSettings = Seq(
scalaVersion := "2.10.0",
scalacOptions ++= Seq(
"-optimize",
"-unchecked",
"-deprecation"
)
)
def buildSettings =
Project.defaultSettings ++
scalaSettings
def buildSettings =
Project.defaultSettings ++
scalaSettings
lazy val root = {
val settings = buildSettings ++ Seq(name := "JavaSample")
Project(id = "JavaSample", base = file("."), settings = settings)
}
}
lazy val root = {
val settings = buildSettings ++ Seq(name := "JavaSample")
Project(id = "JavaSample", base = file("."), settings = settings)
}
}
Now edit project/plugins.sbt and paste the following. This will enable auto-generation of an Eclipse project:
Now edit :file:`project/plugins.sbt` and paste the following.
This will enable auto-generation of an Eclipse project:
.. code-block:: scala
addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.1.0")
Now run sbt from the 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
......@@ -137,19 +384,22 @@ You should see something like this:
:alt: SBT output
:align: center
You can now import the SBT project using "Import ... -> Existing projects into workspace" from Eclipse. Whether you actually do this is optional for the guide; we'll be using SBT to build the project, so if you choose to use Eclipse it will just be as a text editor.
You can now import the SBT project using :guilabel:`Import ... -> Existing projects into workspace` from Eclipse.
Whether you actually do this is optional for the guide;
we'll be using SBT to build the project, so if you choose to use Eclipse it will just be as a text editor.
To test everything is working, create a simple "Hello OpenCV" application. Do this by creating a file "src/main/java/HelloOpenCV.java" with the following contents:
To test 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:
.. code-block:: java
public class HelloOpenCV {
public static void main(String[] args) {
System.out.println("Hello, OpenCV");
}
}
public class HelloOpenCV {
public static void main(String[] args) {
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
......@@ -166,7 +416,9 @@ Copy the OpenCV jar and write a simple application
Now we'll create a simple face detection application using OpenCV.
First, create a "lib/" folder and copy the OpenCV jar into it. 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.
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.
You can optionally rerun ``sbt eclipse`` to update your Eclipse project.
.. code-block:: bash
......@@ -176,13 +428,14 @@ First, create a "lib/" folder and copy the OpenCV jar into it. By default, SBT a
Next, create the directory src/main/resources and download this Lena image into it:
.. image:: images/lena.bmp
.. image:: images/lena.png
:alt: Lena
:align: center
Make sure it's called "lena.bmp". Items in the resources directory are available to the Java application at runtime.
Make sure it's called :file:`"lena.bmp"`.
Items in the resources directory are available to the Java application at runtime.
Next, copy lbpcascade_frontalface.xml into the resources directory:
Next, copy :file:`lbpcascade_frontalface.xml` into the resources directory:
.. code-block:: bash
......@@ -200,7 +453,7 @@ Now modify src/main/java/HelloOpenCV.java so it contains the following Java code
import org.opencv.core.Scalar;
import org.opencv.highgui.Highgui;
import org.opencv.objdetect.CascadeClassifier;
//
// Detects faces in an image, draws boxes around them, and writes the results
// to "faceDetection.png".
......@@ -238,14 +491,17 @@ Now modify src/main/java/HelloOpenCV.java so it contains the following Java code
System.out.println("Hello, OpenCV");
// Load the native library.
System.loadLibrary("opencv_java");
System.loadLibrary("opencv_java244");
new DetectFaceDemo().run();
}
}
}
Note the call to "System.loadLibrary("opencv_java")". This command must be executed exactly once per Java process prior to using any native OpenCV methods. If you don't call it, you will get UnsatisfiedLink errors. You will also get errors if you try to load OpenCV when it has already been loaded.
Note the call to ``System.loadLibrary("opencv_java244")``.
This command must be executed exactly once per Java process prior to using any native OpenCV methods.
If you don't call it, you will get ``UnsatisfiedLink errors``.
You will also get errors if you try to load OpenCV when it has already been loaded.
Now run the face detection app using "sbt run":
Now run the face detection app using ``sbt run``:
.. code-block:: bash
......@@ -257,7 +513,7 @@ You should see something like this:
:alt: SBT run
:align: center
It should also write the following image to faceDetection.png:
It should also write the following image to :file:`faceDetection.png`:
.. image:: images/faceDetection.png
:alt: Detected face
......
doc/tutorials/introduction/table_of_content_introduction/table_of_content_introduction.rst
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......@@ -111,9 +111,9 @@ Here you can read tutorials about how to set up your computer to work with the O
*Compatibility:* > OpenCV 2.4.4
*Author:* |Author_VsevolodG|
*Author:* |Author_EricCh|
Explains how to build and run a simple desktop Java application using Eclipse and the Simple Build Tool (SBT).
Explains how to build and run a simple desktop Java application using Eclipse, Ant or the Simple Build Tool (SBT).
================ =================================================
......@@ -258,7 +258,7 @@ Here you can read tutorials about how to set up your computer to work with the O
../linux_eclipse/linux_eclipse
../windows_install/windows_install
../windows_visual_studio_Opencv/windows_visual_studio_Opencv
../android_binary_package/java_dev_intro
../desktop_java/java_dev_intro
../android_binary_package/android_dev_intro
../android_binary_package/O4A_SDK
../android_binary_package/dev_with_OCV_on_Android
......
samples/java/ant/build.xml 0 → 100644
View file @ a8c2fc69
<project name="SimpleSample" basedir="." default="rebuild-run">
<property name="src.dir" value="src"/>
<property name="lib.dir" value="${ocvJarDir}"/>
<path id="classpath">
<fileset dir="${lib.dir}" includes="**/*.jar"/>
</path>
<property name="build.dir" value="build"/>
<property name="classes.dir" value="${build.dir}/classes"/>
<property name="jar.dir" value="${build.dir}/jar"/>
<property name="main-class" value="${ant.project.name}"/>
<target name="clean">
<delete dir="${build.dir}"/>
</target>
<target name="compile">
<mkdir dir="${classes.dir}"/>
<javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>
</target>
<target name="jar" depends="compile">
<mkdir dir="${jar.dir}"/>
<jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
<manifest>
<attribute name="Main-Class" value="${main-class}"/>
</manifest>
</jar>
</target>
<target name="run" depends="jar">
<java fork="true" classname="${main-class}">
<sysproperty key="java.library.path" path="${ocvLibDir}"/>
<classpath>
<path refid="classpath"/>
<path location="${jar.dir}/${ant.project.name}.jar"/>
</classpath>
</java>
</target>
<target name="rebuild" depends="clean,jar"/>
<target name="rebuild-run" depends="clean,run"/>
</project>
\ No newline at end of file
samples/java/ant/src/SimpleSample.java 0 → 100644
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import org.opencv.core.Mat;
import org.opencv.core.CvType;
import org.opencv.core.Scalar;
class SimpleSample {
static{ System.loadLibrary("opencv_java244"); }
public static void main(String[] args) {
Mat m = new Mat(5, 10, CvType.CV_8UC1, new Scalar(0));
System.out.println("OpenCV Mat: " + m);
Mat mr1 = m.row(1);
mr1.setTo(new Scalar(1));
Mat mc5 = m.col(5);
mc5.setTo(new Scalar(5));
System.out.println("OpenCV Mat data:\n" + m.dump());
}
}
samples/java/eclipse/HelloCV/.classpath 0 → 100644
View file @ a8c2fc69
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
<classpathentry kind="con" path="org.eclipse.jdt.USER_LIBRARY/opencv-2.4.4"/>
<classpathentry kind="output" path="bin"/>
</classpath>
samples/java/eclipse/HelloCV/.project 0 → 100644
View file @ a8c2fc69
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>HelloCV</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>
samples/java/eclipse/HelloCV/.settings/org.eclipse.jdt.core.prefs 0 → 100644
View file @ a8c2fc69
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.7
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.source=1.7
samples/java/eclipse/HelloCV/src/Main.java 0 → 100644
View file @ a8c2fc69
import org.opencv.core.CvType;
import org.opencv.core.Mat;
public class Main {
public static void main(String[] args) {
System.loadLibrary("opencv_java244");
Mat m = Mat.eye(3, 3, CvType.CV_8UC1);
System.out.println("m = " + m.dump());
}
}
samples/java/README → samples/java/sbt/README
View file @ a8c2fc69
......@@ -4,5 +4,3 @@ To run the examples:
1) Install OpenCV and copy the OpenCV jar to lib/. This jar must match the native libraries installed in your system. If this isn't the case, you may get a java.lang.UnsatisfiedLinkError at runtime.
3) Go to the root directory and type "sbt/sbt run". This should generate images in your current directory.
MIT License
\ No newline at end of file
samples/java/project/build.scala → samples/java/sbt/project/build.scala
View file @ a8c2fc69
......@@ -11,8 +11,8 @@ object OpenCVJavaDemoBuild extends Build {
)
)
def buildSettings =
Project.defaultSettings ++
def buildSettings =
Project.defaultSettings ++
scalaSettings
lazy val root = {
......
samples/java/project/plugins.sbt → samples/java/sbt/project/plugins.sbt
View file @ a8c2fc69
addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.1.0")
samples/java/sbt/src/main/java/DetectFaceDemo.java 0 → 100644
View file @ a8c2fc69
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.highgui.Highgui;
import org.opencv.objdetect.CascadeClassifier;
/*
* Detects faces in an image, draws boxes around them, and writes the results
* to "faceDetection.png".
*/
public class DetectFaceDemo {
public void run() {
System.out.println("\nRunning DetectFaceDemo");
// Create a face detector from the cascade file in the resources
// directory.
CascadeClassifier faceDetector = new CascadeClassifier(getClass()
.getResource("/lbpcascade_frontalface.xml").getPath());
Mat image = Highgui.imread(getClass().getResource(
"/AverageMaleFace.jpg").getPath());
// Detect faces in the image.
// MatOfRect is a special container class for Rect.
MatOfRect faceDetections = new MatOfRect();
faceDetector.detectMultiScale(image, faceDetections);
System.out.println(String.format("Detected %s faces",
faceDetections.toArray().length));
// Draw a bounding box around each face.
for (Rect rect : faceDetections.toArray()) {
Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x
+ rect.width, rect.y + rect.height), new Scalar(0, 255, 0));
}
// Save the visualized detection.
String filename = "faceDetection.png";
System.out.println(String.format("Writing %s", filename));
Highgui.imwrite(filename, image);
}
}
\ No newline at end of file
samples/java/src/main/scala/Main.scala → samples/java/sbt/src/main/scala/Main.scala
View file @ a8c2fc69
......@@ -4,9 +4,9 @@
* demonstrating the generic nature of the interface.
* The other demos are in Java.
* Currently, all demos are run, sequentially.
*
*
* You're invited to submit your own examples, in any JVM language of
* your choosing so long as you can get them to build.
* your choosing so long as you can get them to build.
*/
object Main extends App {
// We must load the native library before using any OpenCV functions.
......
samples/java/src/main/scala/ScalaCorrespondenceMatchingDemo.scala → samples/java/sbt/src/main/scala/ScalaCorrespondenceMatchingDemo.scala
View file @ a8c2fc69
......@@ -16,7 +16,7 @@ import reflect._
object ScalaCorrespondenceMatchingDemo {
def run() {
println(s"\nRunning ${classTag[this.type].toString.replace("$", "")}")
// Detects keypoints and extracts descriptors in a given image of type Mat.
def detectAndExtract(mat: Mat) = {
// A special container class for KeyPoint.
......@@ -27,7 +27,7 @@ object ScalaCorrespondenceMatchingDemo {
println(s"There were ${keyPoints.toArray.size} KeyPoints detected")
// Let's just use the best KeyPoints.
// Let's just use the best KeyPoints.
val sorted = keyPoints.toArray.sortBy(_.response).reverse.take(50)
// There isn't a constructor that takes Array[KeyPoint], so we unpack
// the array and use the constructor that can take any number of
......@@ -44,7 +44,7 @@ object ScalaCorrespondenceMatchingDemo {
(bestKeyPoints, descriptors)
}
// Load the images from the |resources| directory.
// Load the images from the |resources| directory.
val leftImage = Highgui.imread(getClass.getResource("/img1.bmp").getPath)
val rightImage = Highgui.imread(getClass.getResource("/img2.bmp").getPath)
......
samples/java/src/main/java/DetectFaceDemo.java deleted 100644 → 0
View file @ c2c2403a
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.highgui.Highgui;
import org.opencv.objdetect.CascadeClassifier;
/*
* Detects faces in an image, draws boxes around them, and writes the results
* to "faceDetection.png".
*/
public class DetectFaceDemo {
public void run() {
System.out.println("\nRunning DetectFaceDemo");
// Create a face detector from the cascade file in the resources
// directory.
CascadeClassifier faceDetector = new CascadeClassifier(getClass()
.getResource("/lbpcascade_frontalface.xml").getPath());
Mat image = Highgui.imread(getClass().getResource(
"/AverageMaleFace.jpg").getPath());
// Detect faces in the image.
// MatOfRect is a special container class for Rect.
MatOfRect faceDetections = new MatOfRect();
faceDetector.detectMultiScale(image, faceDetections);
System.out.println(String.format("Detected %s faces",
faceDetections.toArray().length));
// Draw a bounding box around each face.
for (Rect rect : faceDetections.toArray()) {
Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x
+ rect.width, rect.y + rect.height), new Scalar(0, 255, 0));
}
// Save the visualized detection.
String filename = "faceDetection.png";
System.out.println(String.format("Writing %s", filename));
Highgui.imwrite(filename, image);
}
}
\ No newline at end of file
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