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POAndroid ICS API 14 - Camera.Face face recognition
 

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  1. POAndroid ICS API 14 - Camera.Face face recognition
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    <p>Attempting to use Android 4 API 14 face recognition found in Camera.Face class.</p> <p>I'm having difficulty getting values for face coordinates [Left/Right eye, mouth].</p> <p>Device im using is Samsung Galaxy Tab 2 [GT-P5100] with Android 4.0.4 </p> <p>I'm initialising face detection something like below code snippet and the value of <em>camera.getParameters().getMaxNumDetectedFaces()</em> is returned as 3 when running on the above mentioned device.</p> <p>Now when face is introduced to the surface frame and detected in face detection listener, it returns back the values in <em>faces[0].rect.flattenToString()</em> identifying position of the face on surface. However the rest of the values i.e. face id, left/right eye and mouth are returned as -1 and Null respectively.</p> <p>This behaviour is described in <a href="http://developer.android.com/reference/android/hardware/Camera.Face.html" rel="noreferrer" title="Android documentation">documentation</a> as </p> <blockquote> <p>This is an optional field, may not be supported on all devices. If not supported, the value will always be set to null. The optional fields are supported as a set. Either they are all valid, or none of them are.</p> </blockquote> <p>So the question is am I missing something or is it simply that my device can not support Android api face recognition as found in Camera.Face?</p> <p>It is worth to mention that same device offeres face log in to the device, which is configured trough user settings.</p> <pre><code> FaceDetectionListener faceDetectionListener = new FaceDetectionListener(){ @Override public void onFaceDetection(Face[] faces, Camera camera) { if (faces.length == 0){ prompt.setText(" No Face Detected! "); }else{ prompt.setText(String.valueOf(faces.length) + " Face Detected :) [ " + faces[0].rect.flattenToString() + "Coordinates : Left Eye - " + faces[0].leftEye + "]" ) ; Log.i("TEST", "face coordinates = Rect :" + faces[0].rect.flattenToString()); Log.i("TEST", "face coordinates = Left eye : " + String.valueOf(faces[0].leftEye)); Log.i("TEST", "face coordinates = Right eye - " + String.valueOf(faces[0].rightEye)); Log.i("TEST", "face coordinates = Mouth - " + String.valueOf(faces[0].mouth)); } </code></pre> <p>.....</p> <pre><code> if (camera != null){ try { camera.setPreviewDisplay(surfaceHolder); camera.startPreview(); prompt.setText(String.valueOf( "Max Face: " + camera.getParameters().getMaxNumDetectedFaces())); camera.startFaceDetection(); previewing = true; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } </code></pre>
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    1. COI don't think you are missing anything. Your device can do face detection but doesn't support the optional feature detection piece of the API.
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    2. COHay Christian, just for clarity. This same device offers face recognition as a login feature. Are you of opinion/suggesting that device manufacturer would use different code to offer this face recognition functionality to the one found in the Android API ?
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    3. COThe device does support face recognition which is why faces.rect has a value in it but it doesn't support the optional facial feature detection.
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