Merge pull request #301 from emchristiansen:javasample2.4

samples/java/ant/build.xml

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+<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>

samples/java/ant/src/SimpleSample.java

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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

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+<?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

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+<?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

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+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

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+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/sbt/README

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+A demo of the Java wrapper for OpenCV with two examples:
+1) feature detection and matching and
+2) face detection.
+The examples are coded in Scala and Java.
+Anyone familiar with Java should be able to read the Scala examples.
+Please feel free to contribute code examples in Scala or Java, or any JVM language.
+
+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.
+2) Go to the root directory and type "sbt/sbt run".
+   This should generate images in your current directory.

samples/java/sbt/project/build.scala

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+import sbt._
+import Keys._
+
+object OpenCVJavaDemoBuild extends Build {
+  def scalaSettings = Seq(
+    scalaVersion := "2.10.0",
+    scalacOptions ++= Seq(
+      "-optimize",
+      "-unchecked",
+      "-deprecation"
+    )
+  )
+
+  def buildSettings =
+    Project.defaultSettings ++
+    scalaSettings
+
+  lazy val root = {
+    val settings = buildSettings ++ Seq(name := "OpenCVJavaDemo")
+    Project(id = "OpenCVJavaDemo", base = file("."), settings = settings)
+  }
+}

samples/java/sbt/project/plugins.sbt

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+addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.1.0")

samples/java/sbt/sbt/sbt

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+java -Xms512M -Xmx1536M -Xss1M -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=384M -jar `dirname $0`/sbt-launch.jar "$@"

samples/java/sbt/src/main/java/DetectFaceDemo.java

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+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);
+    }
+}

samples/java/sbt/src/main/scala/Main.scala

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+/*
+ * The main runner for the Java demos.
+ * Demos whose name begins with "Scala" are written in the Scala language,
+ * 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.
+ */
+object Main extends App {
+  // We must load the native library before using any OpenCV functions.
+  // You must load this library _exactly once_ per Java invocation.
+  // If you load it more than once, you will get a java.lang.UnsatisfiedLinkError.
+  System.loadLibrary("opencv_java")
+
+  ScalaCorrespondenceMatchingDemo.run()
+  ScalaDetectFaceDemo.run()
+  new DetectFaceDemo().run()
+}

samples/java/sbt/src/main/scala/ScalaCorrespondenceMatchingDemo.scala

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+import org.opencv.highgui.Highgui
+import org.opencv.features2d.DescriptorExtractor
+import org.opencv.features2d.Features2d
+import org.opencv.core.MatOfKeyPoint
+import org.opencv.core.Mat
+import org.opencv.features2d.FeatureDetector
+import org.opencv.features2d.DescriptorMatcher
+import org.opencv.core.MatOfDMatch
+import reflect._
+
+/*
+ * Finds corresponding points between a pair of images using local descriptors.
+ * The correspondences are visualized in the image "scalaCorrespondences.png",
+ * which is written to disk.
+ */
+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.
+      val keyPoints = new MatOfKeyPoint
+      // We're using the SURF detector.
+      val detector = FeatureDetector.create(FeatureDetector.SURF)
+      detector.detect(mat, keyPoints)
+
+      println(s"There were ${keyPoints.toArray.size} KeyPoints detected")
+
+      // Let's just use the best KeyPoints.
+      val sorted = keyPoints.toArray.sortBy(_.response).reverse.take(50)
+      // There isn't a constructor that takes Array[KeyPoint], so we unpack
+      // the array and use the constructor that can take any number of
+      // arguments.
+      val bestKeyPoints: MatOfKeyPoint = new MatOfKeyPoint(sorted: _*)
+
+      // We're using the SURF descriptor.
+      val extractor = DescriptorExtractor.create(DescriptorExtractor.SURF)
+      val descriptors = new Mat
+      extractor.compute(mat, bestKeyPoints, descriptors)
+
+      println(s"${descriptors.rows} descriptors were extracted, each with dimension ${descriptors.cols}")
+
+      (bestKeyPoints, descriptors)
+    }
+
+    // Load the images from the |resources| directory.
+    val leftImage = Highgui.imread(getClass.getResource("/img1.png").getPath)
+    val rightImage = Highgui.imread(getClass.getResource("/img2.png").getPath)
+
+    // Detect KeyPoints and extract descriptors.
+    val (leftKeyPoints, leftDescriptors) = detectAndExtract(leftImage)
+    val (rightKeyPoints, rightDescriptors) = detectAndExtract(rightImage)
+
+    // Match the descriptors.
+    val matcher = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE)
+    // A special container class for DMatch.
+    val dmatches = new MatOfDMatch
+    // The backticks are because "match" is a keyword in Scala.
+    matcher.`match`(leftDescriptors, rightDescriptors, dmatches)
+
+    // Visualize the matches and save the visualization.
+    val correspondenceImage = new Mat
+    Features2d.drawMatches(leftImage, leftKeyPoints, rightImage, rightKeyPoints, dmatches, correspondenceImage)
+    val filename = "scalaCorrespondences.png"
+    println(s"Writing ${filename}")
+    assert(Highgui.imwrite(filename, correspondenceImage))
+  }
+}

samples/java/sbt/src/main/scala/ScalaDetectFaceDemo.scala

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+import org.opencv.core.Core
+import org.opencv.core.MatOfRect
+import org.opencv.core.Point
+import org.opencv.core.Scalar
+import org.opencv.highgui.Highgui
+import org.opencv.objdetect.CascadeClassifier
+import reflect._
+
+/*
+ * Detects faces in an image, draws boxes around them, and writes the results
+ * to "scalaFaceDetection.png".
+ */
+object ScalaDetectFaceDemo {
+  def run() {
+    println(s"\nRunning ${classTag[this.type].toString.replace("$", "")}")
+
+    // Create a face detector from the cascade file in the resources directory.
+    val faceDetector = new CascadeClassifier(getClass.getResource("/lbpcascade_frontalface.xml").getPath)
+    val image = Highgui.imread(getClass.getResource("/AverageMaleFace.jpg").getPath)
+
+    // Detect faces in the image.
+    // MatOfRect is a special container class for Rect.
+    val faceDetections = new MatOfRect
+    faceDetector.detectMultiScale(image, faceDetections)
+
+    println(s"Detected ${faceDetections.toArray.size} faces")
+
+    // Draw a bounding box around each face.
+    for (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.
+    val filename = "scalaFaceDetection.png"
+    println(s"Writing ${filename}")
+    assert(Highgui.imwrite(filename, image))
+  }
+}