Face Recognition using javacv

[kav...@amazinggadgetdeals.com]

Here is the code

      File path= Environment.getExternalStorageDirectory();

      String trainingDir = path.getAbsolutePath() + "/face";

      Mat testImage = imread(trainingDir+"/1-filename.png", CV_LOAD_IMAGE_GRAYSCALE);

      File root = new File(trainingDir);

      FilenameFilter imgFilter = new FilenameFilter() {

          public boolean accept(File dir, String name) {

              name = name.toLowerCase();

              return name.endsWith(".jpg") || name.endsWith(".pgm") || name.endsWith(".png");

          }

      };

      File[] imageFiles = root.listFiles(imgFilter);

      MatVector images = new MatVector(imageFiles.length);

      Mat labels = new Mat(imageFiles.length, 1, CvType.CV_32SC1);

      IntBuffer labelsBuf = labels.getIntBuffer();

   

      int counter = 0;

      for (File image : imageFiles) {

          Mat img = imread(image.getAbsolutePath(), CV_LOAD_IMAGE_GRAYSCALE);

          int label = Integer.parseInt(image.getName().split("-")[0]);

          images.put(counter, img);

          labelsBuf.put(counter, label);

          counter++;

      }

      opencv_contrib.FaceRecognizer faceRecognizer=new opencv_contrib.FaceRecognizer();

      faceRecognizer.train(images, labels);

      int predictedLabel = faceRecognizer.predict(testImage);

     

I got this error

W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)

W/System.err﹕ java.lang.NullPointerException: This pointer address is NULL.

W/System.err﹕ at org.bytedeco.javacpp.opencv_contrib$FaceRecognizer.train(Native Method)

W/System.err﹕ at com.example.kavitha.androidface.MainActivity.opencvcheck(MainActivity.java:133)

W/System.err﹕ at com.example.kavitha.androidface.MainActivity$1.onClick(MainActivity.java:41) W/System.err﹕ at android.view.View.performClick(View.java:4295)

W/System.err﹕ at android.view.View$PerformClick.run(View.java:17456)

W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:615)

W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:92)

W/System.err﹕ at android.os.Looper.loop(Looper.java:174)

W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:4952)

W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)

W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:511)

W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)

W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)

W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)

D/dalvikvm﹕ WAIT_FOR_CONCURRENT_GC blocked 0ms

D/dalvikvm﹕ GC_EXPLICIT freed 1458K, 22% free 10501K/13447K, paused 2ms+3ms, total 52ms

  

[Samuel Audet]

On 02/10/2015 09:40 PM, kav...@amazinggadgetdeals.com wrote:
> Here is the code

Do you get the same error when using this code instead?
https://github.com/bytedeco/javacv/blob/master/samples/OpenCVFaceRecognizer.java

Samuel

[kav...@amazinggadgetdeals.com]

I used " FaceRecognizer faceRecognizer =org.bytedeco.javacpp.opencv_contrib.createFisherFaceRecognizer();" instead "FaceRecognizer faceRecognizer = createFisherFaceRecognizer();

This solves my error.