Face detection not working for Front Camera

Question

So basically, i have this code,

        if(mCamera.getParameters().getMaxNumDetectedFaces()==0)
        {
            System.out.println("Face detection not avaliable");
        }
        else
        {
            System.out.println("Max faces: " + Integer.toString(mCamera.getParameters().getMaxNumDetectedFaces()));
        }

        mCamera.setFaceDetectionListener(new FaceDetectionListener() {

            @Override
            public void onFaceDetection(Face[] faces, Camera camera) {
                // TODO Auto-generated method stub
                System.out.println("Face detection callback called." + Integer.toString(faces.length));


            }


        });

After calling mCamera.startFaceDetection();, the callback is called, everything works as normal. However, if I change cameras, the same code results in the callback never being called. The getMaxNumDetectedFaces, returns 35 for both cameras, so I assume its supported on the front camera. I can change the camera back and forth, calling this code each time, and it will work for the back camera but not the front one.

Is there anything else I might be doing wrong?

Answer 1

Is it possible that the quality of the camera that's not working (the front one, right?) Isn't accurate enough for the face detection to work? The camera's image may be too noisy for the face detector to work. There are lot of other variables that could be hindering this.

Also doing a search for front camera, it looks like the front camera's points may be mirrored. This is described in: http://developer.android.com/reference/android/hardware/Camera.Face.html

I hope this helps.