cv::Exception handling added. Multithreading bug fixed.

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

@@ -5,6 +5,11 @@
 #include <string>
 #include <vector>
 
+#include <android/log.h>
+
+#define LOG_TAG "FaceDetection/DetectionBasedTracker"
+#define LOGD(...) ((void)__android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__))
+
 using namespace std;
 using namespace cv;
 
@@ -20,34 +25,120 @@ JNIEXPORT jlong JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeCr
 {
     const char* jnamestr = jenv->GetStringUTFChars(jFileName, NULL);    
     string stdFileName(jnamestr);
+    jlong result = 0;
+    
+    try
+    {
 	DetectionBasedTracker::Parameters DetectorParams;
 	if (faceSize > 0)
 	    DetectorParams.minObjectSize = faceSize;
-    return (jlong)new DetectionBasedTracker(stdFileName, DetectorParams);
+	result = (jlong)new DetectionBasedTracker(stdFileName, DetectorParams);
+    }
+    catch(cv::Exception e)
+    {
+	LOGD("nativeCreateObject catched cv::Exception: %s", e.what());
+	jclass je = jenv->FindClass("org/opencv/core/CvException");
+	if(!je) 
+	    je = jenv->FindClass("java/lang/Exception");
+	jenv->ThrowNew(je, e.what());
+    }
+    
+    return result;
 }
 
 JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeDestroyObject
 (JNIEnv * jenv, jclass jobj, jlong thiz)
 {
+    try
+    {
+	((DetectionBasedTracker*)thiz)->stop();
 	delete (DetectionBasedTracker*)thiz;
+    }
+    catch(cv::Exception e)
+    {
+ 	LOGD("nativeestroyObject catched cv::Exception: %s", e.what());
+	jclass je = jenv->FindClass("org/opencv/core/CvException");
+	if(!je) 
+	    je = jenv->FindClass("java/lang/Exception");
+	jenv->ThrowNew(je, e.what());
+    }
 }
 
 JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeStart
 (JNIEnv * jenv, jclass jobj, jlong thiz)
 {
+    try
+    {
 	((DetectionBasedTracker*)thiz)->run();
+    }
+    catch(cv::Exception e)
+    {
+	LOGD("nativeStart catched cv::Exception: %s", e.what());
+	jclass je = jenv->FindClass("org/opencv/core/CvException");
+	if(!je) 
+	    je = jenv->FindClass("java/lang/Exception");
+	jenv->ThrowNew(je, e.what());
+    }
+    
 }
 
 JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeStop
 (JNIEnv * jenv, jclass jobj, jlong thiz)
 {
+    try
+    {
 	((DetectionBasedTracker*)thiz)->stop();
+    }
+    catch(cv::Exception e)
+    {
+	LOGD("nativeStop catched cv::Exception: %s", e.what());
+	jclass je = jenv->FindClass("org/opencv/core/CvException");
+	if(!je) 
+	    je = jenv->FindClass("java/lang/Exception");
+	jenv->ThrowNew(je, e.what());
+    }
 }
 
+JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeSetFaceSize
+(JNIEnv * jenv, jclass jobj, jlong thiz, jint faceSize)
+{
+    try
+    {
+	if (faceSize > 0)
+	{
+	    DetectionBasedTracker::Parameters DetectorParams = \
+		((DetectionBasedTracker*)thiz)->getParameters();
+	    DetectorParams.minObjectSize = faceSize;
+	    ((DetectionBasedTracker*)thiz)->setParameters(DetectorParams);
+	}
+
+    }
+    catch(cv::Exception e)
+    {
+	LOGD("nativeStop catched cv::Exception: %s", e.what());
+	jclass je = jenv->FindClass("org/opencv/core/CvException");
+	if(!je) 
+	    je = jenv->FindClass("java/lang/Exception");
+	jenv->ThrowNew(je, e.what());
+    }    
+}
+
+
 JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeDetect
 (JNIEnv * jenv, jclass jobj, jlong thiz, jlong imageGray, jlong faces)
 {
+    try
+    {
 	((DetectionBasedTracker*)thiz)->process(*((Mat*)imageGray));
 	((DetectionBasedTracker*)thiz)->getObjects(RectFaces);
 	vector_Rect_to_Mat(RectFaces, *((Mat*)faces));
+    }
+    catch(cv::Exception e)
+    {
+	LOGD("nativeCreateObject catched cv::Exception: %s", e.what());
+	jclass je = jenv->FindClass("org/opencv/core/CvException");
+	if(!je) 
+	    je = jenv->FindClass("java/lang/Exception");
+	jenv->ThrowNew(je, e.what());
+    }
 }
\ No newline at end of file

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

@@ -39,6 +39,14 @@ JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeSta
 JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeStop
   (JNIEnv *, jclass, jlong);
 
+  /*
+   * Class:     org_opencv_samples_fd_DetectionBaseTracker
+   * Method:    nativeSetFaceSize
+   * Signature: (JI)V
+   */
+  JNIEXPORT void JNICALL Java_org_opencv_samples_fd_DetectionBaseTracker_nativeSetFaceSize
+  (JNIEnv *, jclass, jlong, jint);
+   
 /*
  * Class:     org_opencv_samples_fd_DetectionBaseTracker
  * Method:    nativeDetect

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

@@ -20,6 +20,11 @@ public class DetectionBaseTracker
 		nativeStop(mNativeObj);
 	}
 	
+	public void setMinFaceSize(int faceSize)
+	{
+		nativeSetFaceSize(mNativeObj, faceSize);
+	}
+	
 	public void detect(Mat imageGray, MatOfRect faces)
 	{
 		nativeDetect(mNativeObj, imageGray.getNativeObjAddr(), faces.getNativeObjAddr());
@@ -27,17 +32,17 @@ public class DetectionBaseTracker
 	
 	public void release()
 	{
-		nativeStop(mNativeObj);
 		nativeDestroyObject(mNativeObj);
 		mNativeObj = 0;
 	}
 	
-	protected long mNativeObj;
+	protected long mNativeObj = 0;
 	
 	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 nativeSetFaceSize(long thiz, int faceSize);
 	protected static native void nativeDetect(long thiz, long inputImage, long resultMat);
 	
 	static

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

@@ -43,8 +43,7 @@ class FdView extends SampleCvViewBase {
     	{
     		mFaceSize = Math.round(height * faceSize);
     	}
-    	mTracker.release();
-    	mTracker = new DetectionBaseTracker(mCascadeFile.getAbsolutePath(), mFaceSize);
+    	mTracker.setMinFaceSize(mFaceSize);
     }
     
     public void setDtetectorType(int type)
@@ -120,18 +119,15 @@ class FdView extends SampleCvViewBase {
         
         if (mDetectorType == CASCADE_DETECTOR)
         {
-        	if (mCascade != null) {
+        	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!");