I can successfully compile the program below but when I run it I get errors :
[root@hadoop1 java]# more HelloOpenCV.java
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".
//
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("/lena.png").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);
}
}
public class HelloOpenCV {
public static void main(String[] args) {
System.out.println("Hello, OpenCV");
// Load the native library.
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
new DetectFaceDemo().run();
}
}
the build file is shown below. The "-Djava.library.path " to the local "./lib" folder where the opencv-249.jar file is located
[root@hadoop1 java]# more build.sbt
name := "DetectFaceDemo"
scalaVersion := "2.11.6"
scalacOptions ++= Seq(
"-unchecked",
"-deprecation",
"-optimize",
"-Xlint"
)
javaOptions in run += "-Djava.library.path=./lib"
lazy val root = (project in file("."))
fork := true
[root@hadoop1 java]# ls ./lib
opencv-249.jar
[root@hadoop1 java]#
if the "sbt package" successfully creates a jar file but when I run it using SBT I get the following error :
he is complaining about a file "opencv_java249" where as the file that's produced by compilation is "opencv-249.jar"
[root@hadoop1 java]# pwd
/root/openCV/opencv/samples/java/sbt/src/main/java
[root@hadoop1 java]#
[root@hadoop1 java]# ls
build.sbt DetectFaceDemo.java.orig HelloOpenCV.java lib project target
[root@hadoop1 java]#
[root@hadoop1 java]# sbt run
[info] Set current project to DetectFaceDemo (in build file:/root/openCV/opencv/samples/java/sbt/src/main/java/)
[info] Compiling 1 Java source to /root/openCV/opencv/samples/java/sbt/src/main/java/target/scala-2.11/classes...
[info] Running HelloOpenCV
[info] Hello, OpenCV
[error] Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java249 in java.library.path
[error] at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1889)
[error] at java.lang.Runtime.loadLibrary0(Runtime.java:849)
[error] at java.lang.System.loadLibrary(System.java:1088)
[error] at HelloOpenCV.main(HelloOpenCV.java:47)
java.lang.RuntimeException: Nonzero exit code returned from runner: 1
at scala.sys.package$.error(package.scala:27)
[trace] Stack trace suppressed: run last compile:run for the full output.
[error] (compile:run) Nonzero exit code returned from runner: 1
[error] Total time: 1 s, completed Nov 9, 2016 9:04:45 PM
on the other hand if I try to run it via java I get different error as follows :
[root@hadoop1 scala-2.11]# java -cp detectfacedemo_2.11-0.1-SNAPSHOT.jar HelloOpenCV
Hello, OpenCV
Exception in thread "main" java.lang.NoClassDefFoundError: org/opencv/core/Core
at HelloOpenCV.main(HelloOpenCV.java:47)
Caused by: java.lang.ClassNotFoundException: org.opencv.core.Core
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 1 more
