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asked 2018-05-29 00:48:49 -0600

nikshita gravatar image

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Here is the code:

import com.sun.xml.internal.bind.v2.runtime.unmarshaller.LocatorEx.Snapshot; 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.core.Size; import org.opencv.highgui.Highgui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; import org.opencv.objdetect.CascadeClassifier;

public class FaceDetector { private static Mat cropImage;

public static void main(String[] args)throws Exception { int x = 0,y = 0,height = 0,width = 0;

System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    System.out.println("\nRunning FaceDetector");

//CascadeClassifier faceDetector = new CascadeClassifier(FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath()); CascadeClassifier faceDetector = new CascadeClassifier(Snapshot.class.getResource("haarcascade_frontalface_alt.xml").getPath().substring(1)); Mat image = Imgcodecs.imread("C:\image.jpg"); MatOfRect face_Detections = null; faceDetector.detectMultiScale(image, face_Detections); System.out.println(String.format("Detected %s faces", face_Detections.toArray().length)); Rect rectCrop=null; for (Rect rect : face_Detections.toArray()) { Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0)); rectCrop = new Rect(rect.x, rect.y, rect.width, rect.height); }

Mat image_roi = new Mat(image,rectCrop); Imgcodecs.imwrite("C:\cropimage_912.jpg",image_roi);

}}

And the error is: Exception in thread "main" java.lang.NullPointerException

Running FaceDetector at FaceDetector.main(FaceDetector.java:25) C:\Users\sss\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1 BUILD FAILED (total time: 2 seconds)

click to hide/show revision 2
None

updated 2018-05-29 00:51:55 -0600

berak gravatar image

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Here is the code:

import com.sun.xml.internal.bind.v2.runtime.unmarshaller.LocatorEx.Snapshot;
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.core.Size;
import org.opencv.highgui.Highgui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;
 
org.opencv.objdetect.CascadeClassifier;

public class FaceDetector {
    private static Mat cropImage;
 
cropImage;

public static void main(String[] args)throws Exception {
    int x = 0,y = 0,height = 0,width = 0;
 
0;

    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
     System.out.println("\nRunning FaceDetector");

 
 //CascadeClassifier faceDetector = new CascadeClassifier(FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath());
   CascadeClassifier faceDetector = new CascadeClassifier(Snapshot.class.getResource("haarcascade_frontalface_alt.xml").getPath().substring(1));
Mat image = Imgcodecs.imread("C:\image.jpg");
Imgcodecs.imread("C:\\image.jpg");
        MatOfRect face_Detections = null;
faceDetector.detectMultiScale(image, face_Detections);
System.out.println(String.format("Detected %s faces",  face_Detections.toArray().length));
Rect rectCrop=null;
for (Rect rect : face_Detections.toArray()) {
    Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
            new Scalar(0, 255, 0));
    rectCrop = new Rect(rect.x, rect.y, rect.width, rect.height);
}
 
}



 Mat image_roi = new Mat(image,rectCrop);
  Imgcodecs.imwrite("C:\cropimage_912.jpg",image_roi);
 
}}
Imgcodecs.imwrite("C:\\cropimage_912.jpg",image_roi);



}}

And the error is: is:

 Exception in thread "main" java.lang.NullPointerException
 
java.lang.NullPointerException

Running FaceDetector
    at FaceDetector.main(FaceDetector.java:25)
C:\Users\sss\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 2 seconds)
seconds)
click to hide/show revision 3
None

updated 2018-05-29 00:52:30 -0600

berak gravatar image

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Here is the code:

import com.sun.xml.internal.bind.v2.runtime.unmarshaller.LocatorEx.Snapshot;
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.core.Size;
import org.opencv.highgui.Highgui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;

public class FaceDetector {
    private static Mat cropImage;

public static void main(String[] args)throws Exception {
    int x = 0,y = 0,height = 0,width = 0;

    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        System.out.println("\nRunning FaceDetector");

//CascadeClassifier faceDetector = new CascadeClassifier(FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath());
   CascadeClassifier faceDetector = new CascadeClassifier(Snapshot.class.getResource("haarcascade_frontalface_alt.xml").getPath().substring(1));
Mat image = Imgcodecs.imread("C:\\image.jpg");
        MatOfRect face_Detections = null;
faceDetector.detectMultiScale(image, face_Detections);
System.out.println(String.format("Detected %s faces",  face_Detections.toArray().length));
Rect rectCrop=null;
for (Rect rect : face_Detections.toArray()) {
    Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
            new Scalar(0, 255, 0));
    rectCrop = new Rect(rect.x, rect.y, rect.width, rect.height);
}



 Mat image_roi = new Mat(image,rectCrop);
  Imgcodecs.imwrite("C:\\cropimage_912.jpg",image_roi);



}}

And the error is:

 Exception in thread "main" java.lang.NullPointerException

Running FaceDetector
    at FaceDetector.main(FaceDetector.java:25)
C:\Users\sss\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 2 seconds)
click to hide/show revision 4
retagged

updated 2018-05-29 00:52:37 -0600

berak gravatar image

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Here is the code:

import com.sun.xml.internal.bind.v2.runtime.unmarshaller.LocatorEx.Snapshot;
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.core.Size;
import org.opencv.highgui.Highgui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;

public class FaceDetector {
    private static Mat cropImage;

public static void main(String[] args)throws Exception {
    int x = 0,y = 0,height = 0,width = 0;

    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        System.out.println("\nRunning FaceDetector");

//CascadeClassifier faceDetector = new CascadeClassifier(FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath());
   CascadeClassifier faceDetector = new CascadeClassifier(Snapshot.class.getResource("haarcascade_frontalface_alt.xml").getPath().substring(1));
Mat image = Imgcodecs.imread("C:\\image.jpg");
        MatOfRect face_Detections = null;
faceDetector.detectMultiScale(image, face_Detections);
System.out.println(String.format("Detected %s faces",  face_Detections.toArray().length));
Rect rectCrop=null;
for (Rect rect : face_Detections.toArray()) {
    Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
            new Scalar(0, 255, 0));
    rectCrop = new Rect(rect.x, rect.y, rect.width, rect.height);
}



 Mat image_roi = new Mat(image,rectCrop);
  Imgcodecs.imwrite("C:\\cropimage_912.jpg",image_roi);



}}

And the error is:

 Exception in thread "main" java.lang.NullPointerException

Running FaceDetector
    at FaceDetector.main(FaceDetector.java:25)
C:\Users\sss\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 2 seconds)
click to hide/show revision 5
retagged

updated 2018-05-29 00:52:37 -0600

berak gravatar image

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Hi! i am trying to crop a detected face from an image using the code below and i am getting the error as Exception in thread "main" java.lang.NullPointerException. Kindly help.

Here is the code:

import com.sun.xml.internal.bind.v2.runtime.unmarshaller.LocatorEx.Snapshot;
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.core.Size;
import org.opencv.highgui.Highgui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;

public class FaceDetector {
    private static Mat cropImage;

public static void main(String[] args)throws Exception {
    int x = 0,y = 0,height = 0,width = 0;

    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        System.out.println("\nRunning FaceDetector");

//CascadeClassifier faceDetector = new CascadeClassifier(FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath());
   CascadeClassifier faceDetector = new CascadeClassifier(Snapshot.class.getResource("haarcascade_frontalface_alt.xml").getPath().substring(1));
Mat image = Imgcodecs.imread("C:\\image.jpg");
        MatOfRect face_Detections = null;
faceDetector.detectMultiScale(image, face_Detections);
System.out.println(String.format("Detected %s faces",  face_Detections.toArray().length));
Rect rectCrop=null;
for (Rect rect : face_Detections.toArray()) {
    Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
            new Scalar(0, 255, 0));
    rectCrop = new Rect(rect.x, rect.y, rect.width, rect.height);
}



 Mat image_roi = new Mat(image,rectCrop);
  Imgcodecs.imwrite("C:\\cropimage_912.jpg",image_roi);



}}

And the error is:

 Exception in thread "main" java.lang.NullPointerException

Running FaceDetector
    at FaceDetector.main(FaceDetector.java:25)
C:\Users\sss\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 2 seconds)
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