Face detection example updated. Dtetection base tracker mode added.

samples/android/face-detection/CMakeLists.txt

 set(sample example-face-detection)
 
-add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS ${OpenCV_BINARY_DIR} SDK_TARGET 11 ${ANDROID_SDK_TARGET})
+if(BUILD_FAT_JAVA_LIB)
+  set(native_deps opencv_java)
+  ocv_include_modules(opencv_contrib)
+else()
+  set(native_deps opencv_contrib)
+endif()
+
+add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS ${OpenCV_BINARY_DIR} SDK_TARGET 11 ${ANDROID_SDK_TARGET} NATIVE_DEPS ${native_deps})
 if(TARGET ${sample})
   add_dependencies(opencv_android_examples ${sample})
 endif()
+

samples/android/face-detection/jni/Android.mk

+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+OPENCV_CAMERA_MODULES:=off
+
+include ../includeOpenCV.mk
+ifeq ("$(wildcard $(OPENCV_MK_PATH))","")
+    #try to load OpenCV.mk from default install location
+    include $(TOOLCHAIN_PREBUILT_ROOT)/user/share/OpenCV/OpenCV.mk
+else
+    include $(OPENCV_MK_PATH)
+endif
+
+LOCAL_SRC_FILES  := DetectionBaseTracker.cpp
+LOCAL_C_INCLUDES := $(LOCAL_PATH) 
+LOCAL_LDLIBS +=  -llog -ldl
+
+LOCAL_MODULE     := detection_base_tacker
+
+include $(BUILD_SHARED_LIBRARY)
\ No newline at end of file

samples/android/face-detection/jni/Application.mk

+APP_STL := gnustl_static
+APP_CPPFLAGS := -frtti -fexceptions
+APP_ABI := armeabi-v7a

samples/android/face-detection/jni/DetectionBaseTracker.cpp

+#include <DetectionBaseTracker.h>
+#include <opencv2/core/core.hpp> 
+#include <opencv2/contrib/detection_based_tracker.hpp>
+
+#include <string>
+#include <vector>
+
+using namespace std;
+using namespace cv;
+
+vector<Rect> RectFaces;
+
+inline void vector_Rect_to_Mat(vector<Rect>& v_rect, Mat& mat)
+{
+    mat = Mat(v_rect, true);
+}
+
+JNIEXPORT jlong JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeCreateObject
+(JNIEnv * jenv, jclass jobj, jstring jFileName, jint faceSize)
+{
+    const char* jnamestr = jenv->GetStringUTFChars(jFileName, NULL);
+    string stdFileName(jnamestr);
+    DetectionBasedTracker::Parameters DetectorParams;
+    if (faceSize > 0)
+	DetectorParams.minObjectSize = faceSize;
+    return (jlong)new DetectionBasedTracker(stdFileName, DetectorParams);
+}
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeDestroyObject
+(JNIEnv * jenv, jclass jobj, jlong thiz)
+{
+    delete (DetectionBasedTracker*)thiz;
+}
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeStart
+(JNIEnv * jenv, jclass jobj, jlong thiz)
+{
+    ((DetectionBasedTracker*)thiz)->run();
+}
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeStop
+(JNIEnv * jenv, jclass jobj, jlong thiz)
+{
+    ((DetectionBasedTracker*)thiz)->stop();
+}
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeDetect
+(JNIEnv * jenv, jclass jobj, jlong thiz, jlong imageGray, jlong faces)
+{
+    ((DetectionBasedTracker*)thiz)->process(*((Mat*)imageGray));
+    ((DetectionBasedTracker*)thiz)->getObjects(RectFaces);
+    vector_Rect_to_Mat(RectFaces, *((Mat*)faces));
+}
\ No newline at end of file

samples/android/face-detection/jni/DetectionBaseTracker.h

+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class org_opencv_samples_fd_DetectionBaseTracker */
+
+#ifndef _Included_org_opencv_samples_fd_DetectionBaseTracker
+#define _Included_org_opencv_samples_fd_DetectionBaseTracker
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     org_opencv_samples_fd_DetectionBaseTracker
+ * Method:    nativeCreateObject
+ * Signature: (Ljava/lang/String;F)J
+ */
+JNIEXPORT jlong JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeCreateObject
+  (JNIEnv *, jclass, jstring, jint);
+
+/*
+ * Class:     org_opencv_samples_fd_DetectionBaseTracker
+ * Method:    nativeDestroyObject
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeDestroyObject
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     org_opencv_samples_fd_DetectionBaseTracker
+ * Method:    nativeStart
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeStart
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     org_opencv_samples_fd_DetectionBaseTracker
+ * Method:    nativeStop
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeStop
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     org_opencv_samples_fd_DetectionBaseTracker
+ * Method:    nativeDetect
+ * Signature: (JJJ)V
+ */
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeDetect
+  (JNIEnv *, jclass, jlong, jlong, jlong);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

samples/android/face-detection/src/org/opencv/samples/fd/DetectionBaseTracker.java

+package org.opencv.samples.fd;
+
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfRect;
+
+public class DetectionBaseTracker
+{	
+	public DetectionBaseTracker(String filename, int faceSize)
+	{
+		mNativeObj = nativeCreateObject(filename, faceSize);
+	}
+	
+	public void start()
+	{
+		nativeStart(mNativeObj);
+	}
+	
+	public void stop()
+	{
+		nativeStop(mNativeObj);
+	}
+	
+	public void detect(Mat imageGray, MatOfRect faces)
+	{
+		nativeDetect(mNativeObj, imageGray.getNativeObjAddr(), faces.getNativeObjAddr());
+	}
+	
+	public void release()
+	{
+		nativeStop(mNativeObj);
+		nativeDestroyObject(mNativeObj);
+		mNativeObj = 0;
+	}
+	
+	protected long mNativeObj;
+	
+	protected static native long nativeCreateObject(String filename, int faceSize);
+	protected static native void nativeDestroyObject(long thiz);
+	protected static native void nativeStart(long thiz);
+	protected static native void nativeStop(long thiz);
+	protected static native void nativeDetect(long thiz, long inputImage, long resultMat);
+	
+	static
+	{
+		System.loadLibrary("detection_base_tacker");
+	}
+}

samples/android/face-detection/src/org/opencv/samples/fd/FdActivity.java

@@ -16,13 +16,18 @@ public class FdActivity extends Activity {
     private MenuItem            mItemFace40;
     private MenuItem            mItemFace30;
     private MenuItem            mItemFace20;
+    private MenuItem            mItemType;
     
     private FdView				mView;
-
-    public static float         minFaceSize = 0.5f;
+    
+    private int                 mDetectorType = 0;
+    private String[]            mDetectorName; 
 
     public FdActivity() {
         Log.i(TAG, "Instantiated new " + this.getClass());
+        mDetectorName = new String[2];
+        mDetectorName[0] = "Cascade";
+        mDetectorName[1] = "DBT";
     }
 
     @Override
@@ -57,6 +62,7 @@ public class FdActivity extends Activity {
         super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         mView = new FdView(this);
+        mView.setDtetectorType(mDetectorType);
         setContentView(mView);
     }
 
@@ -67,6 +73,8 @@ public class FdActivity extends Activity {
         mItemFace40 = menu.add("Face size 40%");
         mItemFace30 = menu.add("Face size 30%");
         mItemFace20 = menu.add("Face size 20%");
+        mItemType   = menu.add(mDetectorName[mDetectorType]);
+        		
         return true;
     }
 
@@ -74,13 +82,19 @@ public class FdActivity extends Activity {
     public boolean onOptionsItemSelected(MenuItem item) {
         Log.i(TAG, "Menu Item selected " + item);
         if (item == mItemFace50)
-            minFaceSize = 0.5f;
+            mView.setMinFaceSize(0.5f);
         else if (item == mItemFace40)
-            minFaceSize = 0.4f;
+        	mView.setMinFaceSize(0.4f);
         else if (item == mItemFace30)
-            minFaceSize = 0.3f;
+        	mView.setMinFaceSize(0.3f);
         else if (item == mItemFace20)
-            minFaceSize = 0.2f;
+        	mView.setMinFaceSize(0.2f);
+        else if (item == mItemType)
+        {
+        	mDetectorType = (mDetectorType + 1) % mDetectorName.length;
+        	item.setTitle(mDetectorName[mDetectorType]);
+        	mView.setDtetectorType(mDetectorType);
+        }
         return true;
     }
 }

samples/android/face-detection/src/org/opencv/samples/fd/FdView.java

@@ -23,10 +23,48 @@ import android.view.SurfaceHolder;
 
 class FdView extends SampleCvViewBase {
     private static final String TAG = "Sample::FdView";
-    private Mat                 mRgba;
-    private Mat                 mGray;
-
-    private CascadeClassifier   mCascade;
+    private Mat                  mRgba;
+    private Mat                  mGray;
+    private File                 mCascadeFile;
+    private CascadeClassifier    mCascade;
+    private DetectionBaseTracker mTracker;
+
+    public final int             CASCADE_DETECTOR = 0;
+    public final int             DBT_DETECTOR     = 1;
+    
+    private int                  mDetectorType = CASCADE_DETECTOR;
+
+    public static int            mFaceSize = 200;
+    
+    public void setMinFaceSize(float faceSize)
+    {
+		int height = mGray.rows();
+    	if (Math.round(height * faceSize) > 0);
+    	{
+    		mFaceSize = Math.round(height * faceSize);
+    	}
+    	mTracker.release();
+    	mTracker = new DetectionBaseTracker(mCascadeFile.getAbsolutePath(), mFaceSize);
+    }
+    
+    public void setDtetectorType(int type)
+    {
+    	if (mDetectorType != type)
+    	{
+    		mDetectorType = type;
+    		
+    		if (type == DBT_DETECTOR)
+    		{
+    			Log.i(TAG, "Detection Base Tracker enabled");
+    			mTracker.start();
+    		}
+    		else
+    		{
+    			Log.i(TAG, "Cascade detectior enabled");
+    			mTracker.stop();
+    		}
+    	}
+    }
 
     public FdView(Context context) {
         super(context);
@@ -34,8 +72,8 @@ class FdView extends SampleCvViewBase {
         try {
             InputStream is = context.getResources().openRawResource(R.raw.lbpcascade_frontalface);
             File cascadeDir = context.getDir("cascade", Context.MODE_PRIVATE);
-            File cascadeFile = new File(cascadeDir, "lbpcascade_frontalface.xml");
-            FileOutputStream os = new FileOutputStream(cascadeFile);
+            mCascadeFile = new File(cascadeDir, "lbpcascade_frontalface.xml");
+            FileOutputStream os = new FileOutputStream(mCascadeFile);
 
             byte[] buffer = new byte[4096];
             int bytesRead;
@@ -45,14 +83,15 @@ class FdView extends SampleCvViewBase {
             is.close();
             os.close();
 
-            mCascade = new CascadeClassifier(cascadeFile.getAbsolutePath());
+            mCascade = new CascadeClassifier(mCascadeFile.getAbsolutePath());
             if (mCascade.empty()) {
                 Log.e(TAG, "Failed to load cascade classifier");
                 mCascade = null;
             } else
-                Log.i(TAG, "Loaded cascade classifier from " + cascadeFile.getAbsolutePath());
+                Log.i(TAG, "Loaded cascade classifier from " + mCascadeFile.getAbsolutePath());
 
-            cascadeFile.delete();
+            mTracker = new DetectionBaseTracker(mCascadeFile.getAbsolutePath(), 0);
+            
             cascadeDir.delete();
 
         } catch (IOException e) {
@@ -77,16 +116,29 @@ class FdView extends SampleCvViewBase {
         capture.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
         capture.retrieve(mGray, Highgui.CV_CAP_ANDROID_GREY_FRAME);
 
-        if (mCascade != null) {
-            int height = mGray.rows();
-            int faceSize = Math.round(height * FdActivity.minFaceSize);
-            MatOfRect faces = new MatOfRect();
-            mCascade.detectMultiScale(mGray, faces, 1.1, 2, 2 // TODO: objdetect.CV_HAAR_SCALE_IMAGE
-                    , new Size(faceSize, faceSize), new Size());
-
-            for (Rect r : faces.toArray())
-                Core.rectangle(mRgba, r.tl(), r.br(), new Scalar(0, 255, 0, 255), 3);
+        MatOfRect faces = new MatOfRect();
+        
+        if (mDetectorType == CASCADE_DETECTOR)
+        {
+        	if (mCascade != null) {
+                mCascade.detectMultiScale(mGray, faces, 1.1, 2, 2 // TODO: objdetect.CV_HAAR_SCALE_IMAGE
+                        , new Size(mFaceSize, mFaceSize), new Size());
+            }
+        }
+        else if (mDetectorType == DBT_DETECTOR)
+        {
+        	if (mTracker != null)
+        	{
+        		mTracker.detect(mGray, faces);
+        	}
+        }
+        else
+        {
+        	Log.e(TAG, "Detection method is not selected!");
         }
+        
+        for (Rect r : faces.toArray())
+            Core.rectangle(mRgba, r.tl(), r.br(), new Scalar(0, 255, 0, 255), 3);
 
         Bitmap bmp = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(), Bitmap.Config.RGB_565/*.ARGB_8888*/);
 
@@ -110,9 +162,14 @@ class FdView extends SampleCvViewBase {
                 mRgba.release();
             if (mGray != null)
                 mGray.release();
+            if (mCascadeFile != null)
+            	mCascadeFile.delete();
+            if (mTracker != null)
+            	mTracker.release();
 
             mRgba = null;
             mGray = null;
+            mCascadeFile = null;
         }
     }
 }