使用FaceDetection进行人脸识别

主要思路：

1.在Activity 的onCreate中添加DrawingView，用于显示矩形框

<pre name="code" class="java"><span style="font-size:18px;">public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 屏幕方向设置
		setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

		....

		drawingView = new DrawingView(this);
		LayoutParams layoutParamsDrawing = new LayoutParams(
				LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
		this.addContentView(drawingView, layoutParamsDrawing);
}</span>

2.写一个FaceDetectionListener 类，用于监听识别后的回调

<span style="font-size:18px;">FaceDetectionListener faceDetectionListener = new FaceDetectionListener() {

		@Override
		public void onFaceDetection(final Face[] faces, Camera camera) {
			if (faces.length == 0) {
				prompt.setText(" No Face Detected! ");
				drawingView.setHaveFace(false);
				Log.i(TAG, " No Face Detected! ");
			} else {
				prompt.setText(String.valueOf(faces.length)
						+ " Face Detected :) ");
				drawingView.setHaveFace(true);
				detectedFaces = faces;
				Log.i(TAG, " Face Detected :) ");
			}
		}
	};</span>

3.1在surface创建时，创建相机对象并绑定监听器

<span style="font-size:18px;">public void surfaceCreated(SurfaceHolder holder) {
		camera = Camera.open();
		camera.setFaceDetectionListener(faceDetectionListener);
	}</span>

3.2在surface改变时，开启相机人脸识别

<span style="font-size:18px;">public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		...
				int maxDetectFace = camera.getParameters()
						.getMaxNumDetectedFaces();
				if (maxDetectFace > 0)
					<strong>camera.startFaceDetection();</strong>
				previewing = true;
		...
	}</span>

下载链接：

参考文献：

http://www.tuicool.com/articles/JJVbmu

http://www.tuicool.com/articles/BRji6z