【android+opencv人脸检测】

最近在做人脸识别，现在初步只做了人脸检测，比较简单，仅供参考。

功能是打开图片，进行人脸检测，输出人脸个数和检测范围。

.......省略包public class Staticdetection2Activity extends Activity {final private static String TAG = "StaticrecognitionActivity";final private int PICTURE_CHOOSE = 1;private ImageView imageView = null;private Bitmap img = null;private Button buttonDetect = null;private TextView textView = null;private EditText editText = null;// OpenCV类库加载并初始化成功后的回调函数，在此我们不进行任何操作private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {@Overridepublic void onManagerConnected(int status) {switch (status) {case LoaderCallbackInterface.SUCCESS: {}break;default: {super.onManagerConnected(status);}break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_staticdetection2);Button button = (Button) this.findViewById(R.id.button1);button.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {// get a picture form your phoneIntent photoPickerIntent = new Intent(Intent.ACTION_PICK);photoPickerIntent.setType("image/*");startActivityForResult(photoPickerIntent, PICTURE_CHOOSE);}});editText = (EditText) this.findViewById(R.id.editText1);textView = (TextView) this.findViewById(R.id.textView1);buttonDetect = (Button) this.findViewById(R.id.button2);buttonDetect.setVisibility(View.INVISIBLE);buttonDetect.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {textView.setText("Waiting ...");// use the red paint/* * Paint paint = new Paint(); paint.setColor(Color.RED); * paint.setStrokeWidth(Math.max(img.getWidth(), * img.getHeight()) / 100f); *  * // create a new canvas Bitmap bitmap = * Bitmap.createBitmap(img.getWidth(), img.getHeight(), * img.getConfig()); Canvas canvas = new Canvas(bitmap); * canvas.drawBitmap(img, new Matrix(), null); *  * float x, y, w, h; *  * x = y = w = h = 100; *  * // change percent value to the real size x = x / 100 * * img.getWidth(); w = w / 100 * img.getWidth() * 0.7f; y = y / * 100 * img.getHeight(); h = h / 100 * img.getHeight() * 0.7f; *  * // draw the box to mark it out canvas.drawLine(x - w, y - h, * x - w, y + h, paint); canvas.drawLine(x - w, y - h, x + w, y * - h, paint); canvas.drawLine(x + w, y + h, x - w, y + h, * paint); canvas.drawLine(x + w, y + h, x + w, y - h, paint); *  * img = bitmap; */String xmlfilePath = "/sdcard/FaceDetect/haarcascade_frontalface_alt2.xml";CascadeClassifier faceDetector = new CascadeClassifier(xmlfilePath);// Bitmap bmptest = BitmapFactory.decodeResource(getResources(),// R.drawable.lena);Mat testMat = new Mat();Utils.bitmapToMat(img, testMat);// Detect faces in the image.// MatOfRect is a special container class for Rect.MatOfRect faceDetections = new MatOfRect();faceDetector.detectMultiScale(testMat, faceDetections);Log.i(String.format("Detected %s faces",faceDetections.toArray().length), "");int facenum = 0;// Draw a bounding box around each face.for (Rect rect : faceDetections.toArray()) {Core.rectangle(testMat,new Point(rect.x, rect.y),new Point(rect.x + rect.width, rect.y + rect.height),new Scalar(255, 0, 0));++facenum;}// Save the visualized detection.// Bitmap bmpdone = Bitmap.createBitmap(bmptest.getWidth(),// bmptest.getHeight(), Config.RGB_565);Utils.matToBitmap(testMat, img);imageView.setImageBitmap(img);textView.setText("Facecount:" + facenum);/*Staticdetection2Activity.this.runOnUiThread(new Runnable() {public void run() {// show the imageimageView.setImageBitmap(img);// textView.setText("Finished, "+ count + " faces.");textView.setText("Finished, " + " faces.");// set edit text// editText.setText(str);}});*/}});imageView = (ImageView) this.findViewById(R.id.imageView1);imageView.setImageBitmap(img);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.staticdetection2, menu);return true;}@Overrideprotected void onActivityResult(int requestCode, int resultCode,Intent intent) {super.onActivityResult(requestCode, resultCode, intent);// the image picker callbackif (requestCode == PICTURE_CHOOSE) {if (intent != null) {Cursor cursor = getContentResolver().query(intent.getData(),null, null, null, null);cursor.moveToFirst();int idx = cursor.getColumnIndex(ImageColumns.DATA);String fileSrc = cursor.getString(idx);Options options = new Options();options.inJustDecodeBounds = true;img = BitmapFactory.decodeFile(fileSrc, options);options.inSampleSize = Math.max(1, (int) Math.ceil(Math.max((double) options.outWidth / 1024f,(double) options.outHeight / 1024f)));options.inJustDecodeBounds = false;img = BitmapFactory.decodeFile(fileSrc, options);textView.setText("Clik Detect. ==>");imageView.setImageBitmap(img);buttonDetect.setVisibility(View.VISIBLE);} else {Log.d(TAG, "idButSelPic Photopicker canceled");}}}@Overridepublic void onResume() {super.onResume();// 通过OpenCV引擎服务加载并初始化OpenCV类库，所谓OpenCV引擎服务即是// OpenCV_2.4.3.2_Manager_2.4_*.apk程序包，存在于OpenCV安装包的apk目录中OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this,mLoaderCallback);}}