OpenCV Samples testing problems fixed:

Memory leak in color-blob-detection sample fixed;
Default face size in face-detection is set to 20%;
Error handling improved;
Some possible mat leak fixed;
Manager verison and engine interface version incremented to fix incompatibilities;
Docs updated;

android/service/engine/AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.opencv.engine"
-    android:versionCode="18"
-    android:versionName="1.8" >
+    android:versionCode="20"
+    android:versionName="2.0" >
 
     <uses-sdk android:minSdkVersion="8" />
     <uses-feature android:name="android.hardware.touchscreen" android:required="false"/>

android/service/engine/jni/include/EngineCommon.h

@@ -6,7 +6,7 @@
 #define LOG_TAG "OpenCVEngine"
 
 #ifndef OPEN_CV_ENGINE_VERSION
-    #define OPEN_CV_ENGINE_VERSION 1
+    #define OPEN_CV_ENGINE_VERSION 2
 #endif
 
 #define LIB_OPENCV_INFO_NAME "libopencv_info.so"

modules/java/generator/src/java/android+AsyncServiceHelper.java

@@ -41,7 +41,7 @@ class AsyncServiceHelper
     }
 
     protected static final String TAG = "OpenCVManager/Helper";
-    protected static final int MINIMUM_ENGINE_VERSION = 1;
+    protected static final int MINIMUM_ENGINE_VERSION = 2;
     protected OpenCVEngineInterface mEngineService;
     protected LoaderCallbackInterface mUserAppCallback;
     protected String mOpenCVersion;

modules/java/generator/src/java/android+BaseLoaderCallback.java

@@ -52,7 +52,7 @@ public abstract class BaseLoaderCallback implements LoaderCallbackInterface {
                 Log.d(TAG, "OpenCV Manager Service is uncompatible with this app!");
                 AlertDialog IncomatibilityMessage = new AlertDialog.Builder(mAppContext).create();
                 IncomatibilityMessage.setTitle("OpenCV Manager");
-                IncomatibilityMessage.setMessage("OpenCV Manager service is incompatible with this app. Update it!");
+                IncomatibilityMessage.setMessage("OpenCV Manager service is incompatible with this app. Try to update it via Google Play.");
                 IncomatibilityMessage.setCancelable(false); // This blocks the 'BACK' button
                 IncomatibilityMessage.setButton(AlertDialog.BUTTON_POSITIVE, "OK", new OnClickListener() {
                     public void onClick(DialogInterface dialog, int which) {
@@ -60,7 +60,7 @@ public abstract class BaseLoaderCallback implements LoaderCallbackInterface {
                     }
                 });
                 IncomatibilityMessage.show();
-            }
+            } break;
             /** Other status, i.e. INIT_FAILED. **/
             default:
             {
@@ -113,7 +113,7 @@ public abstract class BaseLoaderCallback implements LoaderCallbackInterface {
             {
                 AlertDialog WaitMessage = new AlertDialog.Builder(mAppContext).create();
                 WaitMessage.setTitle("OpenCV is not ready");
-                WaitMessage.setMessage("Installation is in progeress. Wait or exit?");
+                WaitMessage.setMessage("Installation is in progress. Wait or exit?");
                 WaitMessage.setCancelable(false); // This blocks the 'BACK' button
                 WaitMessage.setButton(AlertDialog.BUTTON_POSITIVE, "Wait", new OnClickListener() {
                     public void onClick(DialogInterface dialog, int which) {

modules/java/generator/src/java/android+JavaCameraView.java

@@ -1,6 +1,5 @@
 package org.opencv.android;
 
-import java.io.IOException;
 import java.util.List;
 
 import android.annotation.TargetApi;
@@ -36,7 +35,8 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
 
     private Mat mBaseMat;
     private byte mBuffer[];
-
+    private Mat[] mFrameChain;
+    private int mChainIdx = 0;
     private Thread mThread;
     private boolean mStopThread;
 
@@ -65,6 +65,7 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
     @TargetApi(11)
     protected boolean initializeCamera(int width, int height) {
         Log.d(TAG, "Initialize java camera");
+        boolean result = true;
         synchronized (this) {
             mCamera = null;
 
@@ -99,6 +100,7 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
                 Log.d(TAG, "getSupportedPreviewSizes()");
                 List<android.hardware.Camera.Size> sizes = params.getSupportedPreviewSizes();
 
+                if (sizes != null) {
                     /* Select the size that fits surface considering maximum size allowed */
                     Size frameSize = calculateCameraFrameSize(sizes, new JavaCameraSizeAccessor(), width, height);
 
@@ -127,6 +129,10 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
 
                     mBaseMat = new Mat(mFrameHeight + (mFrameHeight/2), mFrameWidth, CvType.CV_8UC1);
 
+                    mFrameChain = new Mat[2];
+                    mFrameChain[0] = new Mat();
+                    mFrameChain[1] = new Mat();
+
                     AllocateCache();
 
                     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
@@ -135,23 +141,35 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
                         mCamera.setPreviewTexture(mSurfaceTexture);
                     } else
                        mCamera.setPreviewDisplay(null);
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
 
                     /* Finally we are ready to start the preview */
                     Log.d(TAG, "startPreview");
                     mCamera.startPreview();
                 }
+                else
+                    result = false;
+            } catch (Exception e) {
+                result = false;
+                e.printStackTrace();
+            }
+        }
 
-        return true;
+        return result;
     }
 
     protected void releaseCamera() {
         synchronized (this) {
+            if (mCamera != null) {
                 mCamera.stopPreview();
                 mCamera.release();
+            }
             mCamera = null;
+            if (mBaseMat != null)
+                mBaseMat.release();
+            if (mFrameChain != null) {
+                mFrameChain[0].release();
+                mFrameChain[1].release();
+            }
         }
     }
 
@@ -187,6 +205,7 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
                 this.notify();
             }
             Log.d(TAG, "Wating for thread");
+            if (mThread != null)
                 mThread.join();
         } catch (InterruptedException e) {
             e.printStackTrace();
@@ -224,19 +243,19 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
                 }
 
                 if (!mStopThread) {
-                    Mat frameMat = new Mat();
                     switch (mPreviewFormat) {
                         case Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA:
-                            Imgproc.cvtColor(mBaseMat, frameMat, Imgproc.COLOR_YUV2RGBA_NV21, 4);
+                            Imgproc.cvtColor(mBaseMat, mFrameChain[mChainIdx], Imgproc.COLOR_YUV2RGBA_NV21, 4);
                         break;
                         case Highgui.CV_CAP_ANDROID_GREY_FRAME:
-                            frameMat = mBaseMat.submat(0, mFrameHeight, 0, mFrameWidth);
+                            mFrameChain[mChainIdx] = mBaseMat.submat(0, mFrameHeight, 0, mFrameWidth);
                         break;
                         default:
                             Log.e(TAG, "Invalid frame format! Only RGBA and Gray Scale are supported!");
                     };
-                    deliverAndDrawFrame(frameMat);
-                    frameMat.release();
+                    if (!mFrameChain[mChainIdx].empty())
+                        deliverAndDrawFrame(mFrameChain[mChainIdx]);
+                    mChainIdx = 1 - mChainIdx;
                 }
             } while (!mStopThread);
             Log.d(TAG, "Finish processing thread");

samples/android/15-puzzle/src/org/opencv/samples/puzzle15/Puzzle15Activity.java

@@ -63,6 +63,7 @@ public class Puzzle15Activity extends Activity implements CvCameraViewListener,
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }
@@ -76,6 +77,7 @@ public class Puzzle15Activity extends Activity implements CvCameraViewListener,
 
     public void onDestroy() {
         super.onDestroy();
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
     }
 

samples/android/color-blob-detection/src/org/opencv/samples/colorblobdetect/ColorBlobDetectionActivity.java

@@ -78,6 +78,7 @@ public class ColorBlobDetectionActivity extends Activity implements OnTouchListe
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }
@@ -91,6 +92,7 @@ public class ColorBlobDetectionActivity extends Activity implements OnTouchListe
 
     public void onDestroy() {
         super.onDestroy();
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
     }
 
@@ -100,7 +102,7 @@ public class ColorBlobDetectionActivity extends Activity implements OnTouchListe
         mSpectrum = new Mat();
         mBlobColorRgba = new Scalar(255);
         mBlobColorHsv = new Scalar(255);
-        SPECTRUM_SIZE = new Size(200, 32);
+        SPECTRUM_SIZE = new Size(200, 64);
         CONTOUR_COLOR = new Scalar(255,0,0,255);
     }
 
@@ -152,6 +154,9 @@ public class ColorBlobDetectionActivity extends Activity implements OnTouchListe
 
         mIsColorSelected = true;
 
+        touchedRegionRgba.release();
+        touchedRegionHsv.release();
+
         return false; // don't need subsequent touch events
     }
 
@@ -164,10 +169,10 @@ public class ColorBlobDetectionActivity extends Activity implements OnTouchListe
             Log.e(TAG, "Contours count: " + contours.size());
             Imgproc.drawContours(mRgba, contours, -1, CONTOUR_COLOR);
 
-            Mat colorLabel = mRgba.submat(2, 34, 2, 34);
+            Mat colorLabel = mRgba.submat(4, 68, 4, 68);
             colorLabel.setTo(mBlobColorRgba);
 
-            Mat spectrumLabel = mRgba.submat(2, 2 + mSpectrum.rows(), 38, 38 + mSpectrum.cols());
+            Mat spectrumLabel = mRgba.submat(4, 4 + mSpectrum.rows(), 70, 70 + mSpectrum.cols());
             mSpectrum.copyTo(spectrumLabel);
         }
 

samples/android/color-blob-detection/src/org/opencv/samples/colorblobdetect/ColorBlobDetector.java

@@ -22,6 +22,13 @@ public class ColorBlobDetector {
     private Mat mSpectrum = new Mat();
     private List<MatOfPoint> mContours = new ArrayList<MatOfPoint>();
 
+    // Cache
+    Mat mPyrDownMat = new Mat();
+    Mat mHsvMat = new Mat();
+    Mat mMask = new Mat();
+    Mat mDilatedMask = new Mat();
+    Mat mHierarchy = new Mat();
+
     public void setColorRadius(Scalar radius) {
         mColorRadius = radius;
     }
@@ -61,23 +68,17 @@ public class ColorBlobDetector {
     }
 
     public void process(Mat rgbaImage) {
-        Mat pyrDownMat = new Mat();
-
-        Imgproc.pyrDown(rgbaImage, pyrDownMat);
-        Imgproc.pyrDown(pyrDownMat, pyrDownMat);
+        Imgproc.pyrDown(rgbaImage, mPyrDownMat);
+        Imgproc.pyrDown(mPyrDownMat, mPyrDownMat);
 
-        Mat hsvMat = new Mat();
-        Imgproc.cvtColor(pyrDownMat, hsvMat, Imgproc.COLOR_RGB2HSV_FULL);
+        Imgproc.cvtColor(mPyrDownMat, mHsvMat, Imgproc.COLOR_RGB2HSV_FULL);
 
-        Mat Mask = new Mat();
-        Core.inRange(hsvMat, mLowerBound, mUpperBound, Mask);
-        Mat dilatedMask = new Mat();
-        Imgproc.dilate(Mask, dilatedMask, new Mat());
+        Core.inRange(mHsvMat, mLowerBound, mUpperBound, mMask);
+        Imgproc.dilate(mMask, mDilatedMask, new Mat());
 
         List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
-        Mat hierarchy = new Mat();
 
-        Imgproc.findContours(dilatedMask, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
+        Imgproc.findContours(mDilatedMask, contours, mHierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
 
         // Find max contour area
         double maxArea = 0;

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

@@ -50,7 +50,7 @@ public class FdActivity extends Activity implements CvCameraViewListener {
     private int                    mDetectorType       = JAVA_DETECTOR;
     private String[]               mDetectorName;
 
-    private float                  mRelativeFaceSize   = 0;
+    private float                  mRelativeFaceSize   = 0.2f;
     private int                    mAbsoluteFaceSize   = 0;
 
     private CameraBridgeViewBase   mOpenCvCameraView;
@@ -132,6 +132,7 @@ public class FdActivity extends Activity implements CvCameraViewListener {
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }

samples/android/image-manipulations/src/org/opencv/samples/imagemanipulations/ImageManipulationsActivity.java

@@ -113,6 +113,7 @@ public class ImageManipulationsActivity extends Activity implements CvCameraView
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }
@@ -126,6 +127,7 @@ public class ImageManipulationsActivity extends Activity implements CvCameraView
 
     public void onDestroy() {
         super.onDestroy();
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
     }
 

samples/android/tutorial-1-addopencv/src/org/opencv/samples/tutorial1/Sample1Java.java

@@ -68,6 +68,7 @@ public class Sample1Java extends Activity implements CvCameraViewListener {
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }
@@ -81,6 +82,7 @@ public class Sample1Java extends Activity implements CvCameraViewListener {
 
     public void onDestroy() {
         super.onDestroy();
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
     }
 

samples/android/tutorial-2-opencvcamera/src/org/opencv/samples/tutorial2/Sample2NativeCamera.java

@@ -75,6 +75,7 @@ public class Sample2NativeCamera extends Activity implements CvCameraViewListene
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }
@@ -88,6 +89,7 @@ public class Sample2NativeCamera extends Activity implements CvCameraViewListene
 
     public void onDestroy() {
         super.onDestroy();
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
     }
 

samples/android/tutorial-3-native/src/org/opencv/samples/tutorial3/Sample3Native.java

@@ -64,6 +64,7 @@ public class Sample3Native extends Activity implements CvCameraViewListener {
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }
@@ -77,6 +78,7 @@ public class Sample3Native extends Activity implements CvCameraViewListener {
 
     public void onDestroy() {
         super.onDestroy();
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
     }
 

samples/android/tutorial-4-mixed/src/org/opencv/samples/tutorial4/Sample4Mixed.java

@@ -90,6 +90,7 @@ public class Sample4Mixed extends Activity implements CvCameraViewListener {
     @Override
     public void onPause()
     {
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
         super.onPause();
     }
@@ -103,6 +104,7 @@ public class Sample4Mixed extends Activity implements CvCameraViewListener {
 
     public void onDestroy() {
         super.onDestroy();
+        if (mOpenCvCameraView != null)
             mOpenCvCameraView.disableView();
     }